A-A-52163 Ladders, Vehicle-BoardingThis CID covers nine different types of portable, metal, step-ladders hereinafter referred to as ladders for use by personnel in boarding vehicles.

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PIN number

Number of steps Width, inside rails Width, outside rails

Hook centers

Step depth First step rise Typical step rise Vertical rise, total Angle with ground Material

W1

W2

H D R1

R2

R3

A

A52163-D1

4

457 mm (18 in)

537 mm (21.1 in)

502 mm (19.8 in)

203 mm (8 in)

286 mm (11.2 in)

280 mm (11 in)

1220 mm (48 in)

60°

Steel

A52163-D2

5

387 mm (15.2 in)

457 mm (18 in)

432 mm (17 in)

159 mm (6.25 in)

129 mm (5.08 in)

254 mm (10 in)

1150 mm (45.1 in)

53°

Steel

A52163-D3

4

508 mm (20 in)

610 mm (24 in)

565 mm (22.2 in)

178 mm (7 in)

254 mm (10 in)

254 mm (10 in)

1060 mm (41.8 in)

45°

Aluminum

A52163-D4

4

400 mm (15.8 in)

464 mm (18.2 in)

432 mm (17 in)

178 mm (7 in)

270 mm (10.6 in)

280 mm (11 in)

1300 mm (51.3 in)

60°

Aluminum