1.1.

A roll-over protection structure (safety cab or frame) means the structure on a tractor the essential purpose of which is to avoid or limit risks to the driver resulting from roll-over of the tractor during normal use.

1.2.

The structures mentioned in point 1.1 are characterised by the fact that, in the event of roll-over, they ensure an unobstructed space inside them large enough to protect the driver.

2.1.

Every roll-over protection structure and its attachment to a tractor must be so designed and constructed as to fulfil the essential purpose laid down in point 1.

2.2.

This requirement shall be checked by one of the two test methods described in Annex III. The method chosen shall take account of the tractor mass as follows:

3.1.

The application for EC component type-approval with regard to the strength of a roll-over protection structure and the strength of its attachment to a tractor shall be submitted by the tractor manufacturer or by the manufacturer of the roll-over protection structure or by their authorised representatives.

3.2.

The application for EC component type-approval shall be accompanied by the undermentioned documents in triplicate and by the following particulars:

3.3.

A tractor representative of the tractor type for which the protection structure to be approved is intended shall be submitted to the technical service responsible for conducting the component type-approval tests. This tractor shall be fitted with the roll-over protection structure.

3.4.

The holder of EC component type-approval may request its extension to other tractor types. The competent authority which has granted the original EC component type-approval shall grant the extension if the approved roll-over protection structure and the type(s) of tractor for which the extension is requested comply with the following conditions:

4.1.

Every roll-over protection structure conforming to the approved type shall bear the following markings:

4.2.

All these particulars must appear on a small plate.

4.3.

These markings must be visible, legible and indelible.

1.2.1.

A roll-over protection structure must be tested on a tractor of the type for which it is designed. It must be attached to the tractor in accordance with the instructions of the manufacturer of the tractor and/or those of the manufacturer of the roll-over protection structure.

1.2.2.

For the tests a tractor must be fitted with all structural components of the series production which may influence the strength of the roll-over protection structure or which may be necessary for the strength test.

Components which may create a hazard in the zone of clearance must also be fitted so that they may be examined as to their compliance with the requirements of point 4.1 of this Annex.

1.2.3.

Tests shall be made with the tractor stationary.

2.1.1.

A pendulum weight shall be suspended by two chains or wire ropes from pivot points not less than 6 m above the ground. Means shall be provided for adjusting independently the suspended height of the weight and the angle between the weight and the supporting chains or wire ropes.

2.1.2.

The weight shall be 2 000 ± 20 kg excluding the weight of the chains or wire ropes which themselves shall not exceed 100 kg. The length of the sides of the impact face shall be 680 ± 20 mm (see Annex IV, fig. 4). The weight shall be filled in such a way that the position of its centre of gravity is constant.

2.1.3.

Means shall be provided of pulling the weight back as a pendulum to a height which is determined for each test. A quick-release mechanism shall allow the weight to swing downwards without altering the tilt in relation to the supporting chains or wire ropes.

2.3.1.

The tractor shall be lashed by means of restraining and tensioning devices to ground rails rigidly attached to a non-yielding concrete base. The rails shall be suitably spaced to enable the tractor to be lashed down as illustrated in Annex IV, figs 5, 6 and 7. For each test the tractor wheels and any axle stands used shall rest on the non-yielding base.

2.3.2.

Apart from the tensioning devices and ground rail attachments the tractor shall be lashed down with wire rope of the dimensions specified.

This wire rope shall be any round strand, fibre core, construction 6 × 19 in accordance with ISO 2408. The nominal rope diameter shall be 13 mm.

2.3.3.

The central pivot of an articulated tractor shall be supported and lashed down as appropriate for the front, rear and side impacts and for the crushing tests and shall, in addition, be propped from the side for the side impact. The front and rear wheels need not be in line if this makes it more convenient to attach appropriate wire ropes.

2.4.1.

A beam shall be used as a prop for the wheel in the side impact as shown in Annex IV, fig. 7.

2.4.2.

A softwood beam of approximately 150 mm × 150 mm shall be clamped to the floor to brace the tyres on the side opposite the impact as shown in Annex IV, figs 5, 6 and 7.

2.5.1.

Additional props and lashings shall be used for articulated tractors. Their purpose is to ensure that the section of the tractor on which the roll-over protection structure is fitted is as rigid as that of a rigid tractor.

2.5.2.

Additional specific details are given in Annex III for the impact and crushing tests.

2.7.1.

For the tests laid down in Annex III, Parts A and B, a device must be used on which a moving friction collar is tightly fitted on a horizontal rod for the purpose of measuring the difference between maximum momentary deflection and residual deflection during a side impact test.

2.7.2.

For the tests laid down in Annex III, Part A, measurements shall be made after the laboratory test to determine whether any part of the protection structure has entered the zone of clearance prescribed in point 2 of Annex III, Part A.

2.7.3.

For the tests laid down in Annex III, Part B, equipment must be provided — which may include photographic equipment — so that after the laboratory tests it may be established whether any part of the protection structure has, during these tests, entered or come into contact with the zone of clearance prescribed in point 2 of Annex III, Part B.

2.8.1.

linear dimensions measured during test (except point 2.8.2); protection structure and tractor dimensions, zone of clearance and tyre deflections when lashed for impact tests: ± 3 mm;

2.8.2.

height of pendulum weight set for impact tests: ± 6 mm;

2.8.3.

measured tractor mass: ± 20 kg;

2.8.4.

load applied in crushing tests: ± 2 %;

2.8.5.

angle of weight-supporting chains or wire ropes at the point of impact: ± 2 °.

3.1.1.1.

The list and sequence of tests shall be as follows. The item numbers are those in which the tests are described in Annex III, Parts A and B:

3.1.1.2.

If, during the test, any part of the restraining equipment moves or breaks, the test shall be repeated.

3.1.1.3.

No repairs or adjustments to the tractor or roll-over protection structure may be carried out during the test.

3.1.1.4.

The tractor gear-box shall be in neutral and the brakes off throughout the test.

3.1.1.5.

In the case of a tractor with a reversible driving position (i.e. with a reversible seat and steering wheel), the first impact shall be longitudinal and shall be applied at the heaviest extremity (with more than 50 % of the mass of the tractor). It shall be followed by a crushing test at the same extremity. The second impact shall be on the lightest extremity, and the third impact shall be from the side. Lastly, a second crushing test shall be carried out on the lightest extremity.

4.1.

A roll-over protection structure submitted for EC component type-approval shall be considered as having satisfied requirements concerning strength if it fulfils the following conditions:

4.2.

There is no other feature presenting a particular hazard to the driver, for example, glass of a type likely to shatter dangerously, insufficient padding inside the roof or where the driver’s head may strike.

5.1.

The test report shall be attached to the EC component type-approval certificate referred to in Annex VII. The presentation of the report shall be as shown in Annex V. The report shall include:

5.2.

The report must identify clearly the tractor type (make, type, commercial description, etc.) used for testing and the types for which the roll-over protection structure is intended.

5.3.

If EC component type-approval is being extended for other tractor types, the report must include the exact reference of the report of the original EC component type-approval as well as precise indications regarding the requirements laid down in point 3.4 of Annex I.

1.1.1.

The tractor shall be so placed in relation to the weight that the weight will strike the roll-over protection structure when the impact face of the weight and the supporting chains or wire ropes are at an angle of 20 ° to the vertical unless the roll-over protection structure at the point of contact has, during deflection, a greater angle to the vertical. In this case the impact face of the weight shall be adjusted by means of an additional support so that it is parallel to the roll-over protection structure at the point of impact at the moment of maximum deflection, the supporting chains or wire ropes remaining at an angle of 20 ° to the vertical. Steps must be taken to reduce the tendency of the weight to turn about the point of contact. The suspended height of the weight shall be so adjusted that the locus of its centre of gravity passes through the point of contact.

The point of impact shall be that part of the roll-over protection structure likely to hit the ground first in a rearward overturning accident, normally the upper edge. The position of the centre of gravity of the weight shall be one-sixth of the width of the top of the roll-over protection structure inwards from a vertical plane parallel to the median plane of the tractor touching the outside extremity of the top of the roll-over protection structure.

However, if a curve in the back of the roll-over protection structure starts at a greater distance than that inside this vertical plane, the impact shall be administered at the beginning of the curve, i.e. at the point where this curve is tangential to a line at right angles to the median plane of the tractor (see Annex IV, fig. 9).

If a protruding member would present an inadequate area for the weight, a steel plate of appropriate thickness and depth and about 300 mm in length shall be fastened to that member in such a manner that the strength of the roll-over protection structure is not affected.

1.1.2.

Tractors with rigid bodies shall be lashed down. The points of attachment of the lashings shall be approximately 2 m behind the rear axle and 1,5 m in front of the front axle. They shall either be in the plane in which the centre of gravity of the pendulum will swing or more than one lashing shall give a resultant force in this plane, as in Annex IV, fig. 5.

The lashings shall be tightened so that the deflections in the front and rear tyres are as indicated in point 3.1.5 of Annex II. When the lashings have been tightened, a wooden beam 150 mm × 150 mm shall be clamped in front of the rear wheels and driven tight against them.

1.1.3.

Articulated tractors shall have both axles lashed down. The axle of that section of the tractor on which the roll-over protection structure is mounted shall be treated as the rear axle in Annex IV, fig. 5. The point of articulation will then be supported by a beam 100 mm × 100 mm and will be lashed down firmly by means of wire ropes attached to the ground rails.

1.1.4.

The weight shall be pulled back so that the height of its centre of gravity above that at the point of impact is given by the formula:

H = 125 + 0,020 W

where H is the height of fall in millimetres and W the mass of the tractor as defined in point 1.3 of Annex II.

The weight shall then be released and allowed to crash against the roll-over protection structure.

1.2.1.

The tractor shall be so placed in relation to the weight that the weight will strike the roll-over protection structure when the impact face of the weight and the supporting chains or wire ropes are at an angle of 20 ° to the vertical unless the roll-over protection structure at the point of contact has, during deflection, a greater angle to the vertical. In this case the impact face of the weight shall be adjusted by means of an additional support so that it is parallel to the roll-over protection structure at the point of impact at the moment of maximum deflection, the supporting chains or wire ropes remaining at an angle of 20 ° to the vertical. Steps must be taken to reduce the tendency of the weight to turn about the point of contact. The suspended height of the weight shall be so adjusted that the locus of its centre of gravity passes through the point of contact.

The point of impact shall be that part of the roll-over protection structure likely to hit the ground first if the tractor overturned sideways whilst travelling forward, normally the top front corner. The position of the centre of gravity of the weight shall be not more than 80 mm from a vertical plane parallel to the median plane of the tractor touching the outside extremity of the top of the roll-over protection structure.

However, if a curve in the front of the roll-over protection structure starts at a greater distance than 80 mm inside this vertical plane, the impact shall be administered at the beginning of the curve, i.e. at the point where this curve is tangential to a line at right angles to the median plane of the tractor (see Annex IV, fig. 9).

1.2.2.

Tractors with rigid bodies shall be lashed down as indicated in Annex IV, fig. 6. The points of attachment of the lashings shall be approximately 2 m behind the rear axle and 1,5 m in front of the front axle.

The lashings shall be tightened so that the deflections in the front and rear tyres are as indicated in point 3.1.5 of Annex II. When the lashings have been tightened, a wooden beam approximately 150 mm × 150 mm shall be clamped behind the rear wheels and driven tight against them.

1.2.3.

Articulated tractors shall have both axles lashed down. The axle of that section of the tractor on which the roll-over protection structure is mounted shall be treated as the front axle in Annex IV, fig. 6. The point of articulation shall then be supported by a beam approximately 100 mm × 100 mm and shall be lashed down firmly by means of wire ropes attached to the ground rails.

1.2.4.

The weight shall be pulled back so that the height of its centre of gravity above that at the point of impact is given by the formula:

H = 125 + 0,020 W.

1.3.1.

The tractor shall be so placed in relation to the weight that the weight will strike the roll-over protection structure when the impact face of the weight and the supporting chains or wire ropes are vertical unless the protection structure at the point of contact is, during deflection, other than vertical. In this case the impact face of the weight shall be adjusted by means of an additional support so that it is parallel to the protection structure at the point of impact at the moment of maximum deflection, the supporting chains or wire ropes remaining vertical. The suspended height of the weight shall be so adjusted that the locus of its centre of gravity passes through the point of contact.

The point of impact shall be that part of the roll-over protection structure likely to hit the ground first in a sideways overturning accident, normally the upper edge. Unless it is certain that another part of this edge would hit the ground first, the point of impact shall be in the plane at right angles to the median plane of the tractor and passing through the middle of the seat at the mid-point of adjustment. Steps must be taken to reduce the tendency of the weight to turn about the point of contact.

1.3.2.

For rigid tractors, any axle the position of which is rigid relative to the protection structure shall be lashed down on the side on which the impact is to be administered. In the case of a two-wheel drive tractor this will normally be the rear axle; this arrangement is shown in Annex IV, fig. 7. The two lashings shall pass over the axle from points directly below it, one passing to a point of attachment approximately 1,5 m in front of the axle and the other to a point approximately 1,5 m behind the axle. The lashings shall be tightened so that there is a deflection in the tyre adjacent to the lashing as indicated in point 3.1.5 of Annex II. After lashing, a wooden beam shall be placed as a prop against the wheel opposite the weight and secured to the floor so that it is held tightly against the wheel rim during impact as shown in Annex IV, fig. 7. The length of the beam shall be chosen so that when in position against the wheel it is at an angle of 30 ± 3 ° to the horizontal. Its length shall be 20 to 25 times its thickness and its width two to three times its thickness. Both axles shall be prevented from moving sideways by means of a beam clamped to the floor against the outside of the wheel on the side opposite that on which the impact is to be administered.

1.3.3.

An articulated tractor must be lashed down so that the section of the tractor bearing the protection structure is fixed rigidly to the ground as in the case of a non-articulated tractor.

Both axles of articulated tractors shall be lashed to the ground. The axle and wheels of that section of the tractor on which the protection structure is mounted shall be lashed and propped as in Annex IV, fig. 7. The point of articulation shall be supported by a beam at least 100 mm × 100 mm and lashed down to the ground rails. A prop will be positioned against the point of articulation and secured to the floor so that it has the same effect as a prop against the rear wheel and provides support similar to that achieved for a rigid tractor.

1.3.4.

The weight shall be pulled back so that the height of its centre of gravity above that at the point of impact is given by the formula:

H = 125 + 0,150 W.

1.5.1.

This shall be identical to the crushing test at the rear except that the front edge of the beam shall be over the frontmost top part of the roll-over protection structure.

1.5.2.

Where the front part of the protection structure roof will not sustain the full crushing force, the force shall be applied until the roof is deflected to coincide with the plane joining the upper part of the roll-over protection structure with that part of the front of the tractor capable of supporting the tractor’s mass when overturned. The force shall then be removed and the tractor re-positioned so that the beam is over that point of the protection structure which would then support the rear of the tractor when completely overturned, as shown in Annex IV, fig. 10, and the full force reapplied.

2.1.

The ‘zone of clearance’ is defined by planes as follows, the tractor being on a horizontal surface:

2.2.

The back of the seat shall be determined ignoring any padding thereon. The seat shall be in its rearmost adjustment for normal seated operation of the tractor and in its highest position if this is independently variable. Where the suspension of the seat is adjustable it shall be at its mean setting and the load on it shall be 75 kg.

3.2.1.

After each test the roll-over protection structure shall be examined to see whether any part of the protection structure has entered a zone of clearance round the driving seat as defined in point 2.

3.2.2.

In addition, the protection structure shall be examined to determine whether any part of the zone of clearance is outside the protection of the protection structure. For this purpose it shall be considered to be outside the protection of the structure if any part of it would have come in contact with flat ground if the tractor had overturned towards the direction from which the impact came. For this purpose the tyre and track setting shall be assumed to be the smallest indicated by the manufacturer.

1.1.1.

The tractor shall be so placed in relation to the weight that the weight will strike the roll-over protection structure when the impact face of the weight and the supporting chains or wire ropes are at an angle of 20 ° to the vertical unless the roll-over protection structure at the point of contact has, during deflection, a greater angle to the vertical. In this case the impact face of the weight shall be adjusted by means of an additional support so that it is parallel to the roll-over protection structure at the point of impact at the moment of maximum deflection, the supporting chains or wire ropes remaining at an angle of 20 ° to the vertical. Steps must be taken to reduce the tendency of the weight to turn about the point of contact. The suspended height of the weight shall be so adjusted that the locus of its centre of gravity passes through the point of contact.

The point of impact shall be that part of the roll-over protection structure likely to hit the ground first in a rearward overturning accident, normally the upper edge. The position of the centre of gravity of the weight shall be one-sixth of the width of the top of the roll-over protection structure inwards from a vertical plane parallel to the median plane of the tractor touching the outside extremity of the top of the roll-over protection structure.

However, if a curve in the back of the roll-over protection structure starts at a greater distance than that inside this vertical plane, the impact shall be administered at the beginning of the curve, i.e. at the point where this curve is tangential to a line at right angles to the median plane of the tractor (see Annex IV, fig. 9).

If a protruding member would present an inadequate area for the weight, a steel plate of appropriate thickness and depth and about 300 mm in length shall be fastened to that member in such a manner that the strength of the roll-over protection structure is not affected.

1.1.2.

Tractors with rigid bodies shall be lashed down. The points of attachment of the lashings shall be approximately 2 m behind the rear axle and 1,5 m in front of the front axle. They shall either be in the plane in which the centre of gravity of the pendulum will swing or more than one lashing shall give a resultant force in this plane, as in Annex IV, fig. 5.

The lashing shall be tightened so that the deflections in the front and rear tyres are as indicated in point 3.1.5 of Annex II. After the lashings have been tightened a wooden beam 150 mm × 150 mm shall be clamped in front of the rear wheels and driven tight against them.

1.1.3.

Articulated tractors shall have both axles lashed down. The axle for that section of the tractor on which the roll-over protection structure is mounted shall be treated as the rear axle in Annex IV, fig. 5. The point of articulation will then be supported by a beam 100 mm × 100 mm minimum and will be lashed down firmly by means of wire ropes attached to the ground rails.

1.1.4.

The weight shall be pulled back so that the height of its centre of gravity above that at the point of impact is given by the formula:

H = 2,165 × 10-8 × WL2 or H = 5,73 × 10-2 × I

where:

The weight shall then be released and allowed to crash against the roll-over protection structure.

1.1.5.

There shall be no rear impact in the case of a tractor at least 50 % of the mass of which, as defined in point 1.3 of Annex II, bears on the front axle.

1.2.1.

The tractor shall be so placed in relation to the weight that the weight will strike the roll-over protection structure when the impact face of the weight and the supporting chains or wire ropes are at an angle of 20 ° to the vertical unless the roll-over protection structure at the point of contact has, during deflection, a greater angle to the vertical. In this case the impact face of the weight shall be adjusted by means of an additional support so that it is parallel to the roll-over protection structure at the point of impact at the moment of maximum deflection, the supporting chains or wire ropes remaining at an angle of 20 ° to the vertical. Steps must be taken to reduce the tendency of the weight to turn about the point of contact. The suspended height of the weight shall be so adjusted that the locus of its centre of gravity passes through the point of contact.

The point of impact shall be that part of the protection structure likely to hit the ground first if the tractor overturned sideways whilst travelling forward, normally the top front corner. The position of the centre of gravity of the weight shall be not more than 80 mm from a vertical plane parallel to the median plane of the tractor touching the outside extremity of the top of the roll-over protection structure.

However, if a curve in the front of the roll-over protection structure starts at a greater distance than 80 mm inside this vertical plane, the impact shall be administered at the beginning of the curve, i.e. at the point where this curve is tangential to a line at right angles to the median plane of the tractor (see Annex IV, fig. 9).

1.2.2.

Tractors with rigid bodies shall be lashed down as illustrated in Annex IV, fig. 6. The points of attachment of the lashings shall be approximately 2 m behind the rear axle and 1,5 m in front of the front axle.

The lashings shall be tightened so that the deflections in the front and rear tyres are as indicated in point 3.1.5 of Annex II. When the lashings have been tightened, a wooden beam 150 mm × 150 mm shall be clamped behind the rear wheels and driven tight against them.

1.2.3.

Articulated tractors shall have both axles lashed down. The axle of that section of the tractor on which the roll-over protection structure is mounted shall be treated as the front axle in Annex IV, fig. 6. The point of articulation shall then be supported by a beam 100 mm × 100 mm minimum and shall be lashed down firmly by means of wire ropes attached to the ground rails.

1.2.4.

The weight shall be pulled back so that the height of its centre of gravity above that at the point of impact is given by the formula:

H = 125 + 0,020 W.

1.3.1.

The tractor shall be so placed in relation to the weight that the weight will strike the roll-over protection structure when the impact face of the weight and the supporting chains or wire ropes are vertical unless the protection structure at the point of contact is, during deflection, other than vertical. In this case the impact face of the weight shall be adjusted by means of an additional support so that it is parallel to the protection structure at the point of impact at the moment of maximum deflection, the supporting chains or wire ropes remaining vertical. The suspended height of the weight shall be so adjusted that the locus of its centre of gravity passes through the point of contact.

The point of impact shall be that part of the protection structure likely to hit the ground first in a sideways overturning accident, normally the upper edge. Unless it is certain that another part of this edge would hit the ground first, the point of impact shall be in the plane at right angles to the median plane of the tractor and passing through the middle of the seat at the mid-point of adjustment. Steps must be taken to reduce the tendency of the weight to turn about the point of contact. In the case of a tractor with a reversible driving position (i.e. with a reversible seat and steering wheel), the point of impact shall be determined in relation to the intersection of the median plane of the tractor and of a plane perpendicular to it, by a straight line passing through a point that is equidistant from the two seat reference points.

1.3.2.

For rigid tractors, any axle the position of which is rigid relative to the protection structure shall be lashed down on the side on which the impact is to be administered. In the case of a two-wheel drive tractor this will normally be the rear axle; this arrangement is shown in Annex IV, fig. 7. The two lashings shall pass over the axle from points directly below it, one passing to a point of attachment approximately 1,5 m in front of the axle and the other to a point approximately 1,5 m behind the axle. The lashings shall be tightened so that there is a deflection in the tyre adjacent to the lashing as indicated in point 3.1.5 of Annex II. After lashing, a wooden beam shall be placed as a prop against the wheel opposite the weight and secured to the floor so that it is held tightly against the wheel rim during impact as shown in Annex IV, fig. 7. The length of the beam shall be chosen so that when in position against the wheel it is at an angle of 30 ± 3 ° to the horizontal. Its length shall be 20 to 25 times its thickness and its width two to three times its thickness. Both axles shall be prevented from moving sideways by means of a beam clamped to the floor against the outside of the wheel on the side opposite that on which the impact is to be administered.

1.3.3.

An articulated tractor must be lashed down so that the section of the tractor bearing the protection structure is fixed rigidly to the ground as in the case of a non-articulated tractor.

Both axles of articulated tractors shall be lashed to the ground. The axle and wheels of that section of the tractor on which the protection structure is mounted shall be lashed and propped as in Annex IV, fig. 7. The point of articulation shall be supported by a beam at least 100 mm × 100 mm and lashed down to the ground rails. A prop will be positioned against the point of articulation and secured to the floor so that it has the same effect as a prop against the rear wheel and provides support similar to that achieved for a rigid tractor.

1.3.4.

The weight shall be pulled back so that the height of its centre of gravity above that at the point of impact is given by the formula:

H = 125 + 0,150 W.

1.5.1.

This test shall be identical to the crushing test at the rear except that the front edge of the beam shall be over the frontmost top part of the roll-over protection structure.

1.5.2.

Where the front part of the roll-over protection structure roof cannot sustain the full crushing force, the force shall be applied until the roof is deflected to coincide with the plane joining the upper part of the roll-over protection structure with that part of the front of the tractor capable of supporting the tractor’s mass when overturned. The force shall then be removed and the tractor re-positioned so that the beam is over that point of the roll-over protection structure which would then support the rear of the tractor when completely over-turned as shown in Annex IV, fig. 10, and the full force reapplied.

2.1.

The zone of clearance is illustrated in Annex IV, fig. 3, and is defined in relation to a vertical reference plane generally longitudinal to the tractor and passing through a seat reference point, described in point 2.3, and the centre of the steering wheel. The reference plane shall be assumed to move horizontally with the seat and steering wheel during impacts but to remain perpendicular to the floor of the tractor or of the roll-over protection structure if this is resiliently mounted.

Where the steering wheel is adjustable, its position should be that for normal seated driving.

2.2.

The boundaries of the zone shall be taken as:

2.3.

Seat location and seat reference point

2.3.1.

For the purpose of defining the zone of clearance in point 2.1, the seat shall be at the rearmost point of any horizontal adjustment range. It shall be set at the mid-point of the vertical adjustment range where this is independent of adjustment of its horizontal position.

The reference point shall be established using the apparatus illustrated in Annex IV, figs 1 and 2, to simulate loading by a human occupant. The apparatus shall consist of a seat pan board and backrest boards. The lower backrest board shall be jointed in the region of the ischium humps (A) and loin (B), the joint (B) being adjustable in height.

2.3.2.

The reference point is defined as the point in the median longitudinal plane of the seat where the tangential plane of the lower backrest and a horizontal plane intersect. This horizontal plane cuts the lower surface of the seat pan board 150 mm in front of the abovementioned tangent.

2.3.3.

Where a seat suspension is provided with adjustment for the weight of the driver, this shall be set so that the seat is at the mid-point of its dynamic range.

The apparatus shall be positioned on the seat. It shall then be loaded with a force of 550 N at a point 50 mm in front of joint (A), and the two parts of the backrest board shall be lightly pressed tangentially against the backrest.

2.3.4.

If it is not possible to determine definite tangents to each area of the backrest (above and below the lumbar region) the following should be done:

3.2.1.

During each test the roll-over protection structure shall be examined to see whether any part of the roll-over protection structure has entered a zone of clearance round the driving seat as defined in points 2.1 and 2.2.

3.2.2.

In addition, the roll-over protection structure shall be examined to determine whether any part of the zone of clearance is outside the protection of the roll-over protection structure. For this purpose it shall be considered to be outside the protection of the roll-over protection structure if any part of it would have come in contact with flat ground if the tractor had overturned towards the direction from which the impact came. For this purpose the tyre and track setting shall be assumed to be the smallest specified by the manufacturer.

1.

The application for EC type-approval of a tractor, with regard to the strength of a roll-over protection structure and the strength of its attachment to the tractor shall be submitted by the tractor manufacturer or by his authorised representative.

2.

A tractor representative of the tractor type to be approved, on which a protection structure and its attachment, duly approved, are mounted, shall be submitted to the technical services responsible for conducting the type-approval tests.

3.

The technical service responsible for conducting the type-approval tests shall check whether the approved type of protection structure is intended to be mounted on the type of tractor for which the type-approval is requested. In particular, it shall ascertain that the attachment of the protection structure corresponds to that which was tested when the EC component type-approval was granted.

4.

The holder of the EC type-approval may ask for its extension for other types of protection structures.

5.

The competent authorities shall grant such extension on the following conditions:

6.

A certificate, of which a model is shown in Annex IX, shall be annexed to the EC type-approval certificate for each type-approval or type-approval extension which has been granted or refused.

7.

If the application for EC type-approval for a type of tractor is introduced at the same time as the request for EC component type-approval for a type of roll-over protection structure intended to be mounted on the type of tractor for which EC type-approval is requested, the checks laid down in points 2 and 3 will not be made.