AD 99-21-12 Amendment 39-11356

This amendment adopts a new airworthiness directive (AD), applicable to all British Aerospace (Jetstream) Model 4101 airplanes, that requires a one-time visual inspection of the conduit pipe for distortion or repairs, and replacement of the conduit pipe with a new pipe, if necessary. This amendment also requires replacement of the cable assemblies to the fuel standby pumps with new cable assemblies that have improved sheathing protection. This amendment is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by this AD are intended to prevent electrical arcing due to damaged fuel standby pump cable assemblies and conduit pipes, which could create a possible ignition source, and consequent fire hazard.