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This Aerospace Recommended Practice (ARP) outlines the basic general design considerations for aircraft towbars.

Operators of commercial passenger and cargo aircraft in unanimity will request aircraft manufacturers to follow this standard in the design of the nose gear (when towing operations are normally done from the nose gear) in conventional tricycle type landing gears.

The protective device hereinafter called a "fender," is intended to serve its purpose during normal aircraft servicing and prevent damage during docking contact rather than agressive impact.

This Aerospace Recommended Practice includes the following areas: basis for system requirements; selection of materials coupled with hazards and safety; configuration of design; system operation; and evalua tion testing.

The scope of this recommended practice can be broken into the following categories: a Glossary of terms (para. 3) b Description of basic types (para. 4) c Basic stair design dimensions (para. 5) d Recommended stair design dimensions for aircraft boarding (para. 6) 1 Fixed-riser-type stairs 2 Variable-riser-type stairs e Design safety considerations (para. 7) 1 Loading and safety factors 2 Other safety considerations f Recommended usage of ARP (para. 8)