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 rungs Width, inside top rails

Width, inside bottom rails Width, outside top rails Width, outside bottom rails Angle with ground

W1

W2

W3

W4

A

A52163-I1

11

292 mm (11.5 in)

368 mm (14.5 in)

330 mm (13 in)

406 mm (16 in)

60° (approximately)

First rung rise

Typical rung rise

Vertical rise, total

Rung section diameters

R1

R2

R3

308 mm (12.1 in)

264 mm (10.4 in)

317 mm (12.5 in)

25.4 mm outside diameter (O.D.)

Rail section dimensions

x 19.1 mm inside diameter (I.D.)

(1 in O.D. x 0.75 in I.D.)

Material

57.2 x 19.1 x 2.4 mm

(2.25 x 0.75 x 0.094 in)

Aluminum