Summary
This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain Learjet Model 31 and 35A airplanes. This proposal would require replacement of two segments of 16 American Wire Gauge (AWG) wire with 8 AWG wire at the connector that is connected to the auxiliary cabin heater relay box. This proposal is prompted by a report that two segments of the 16 AWG wire in the auxiliary cabin heater that were spliced during production do not provide adequate current-carrying capacity. The actions specified by the proposed AD are intended to prevent electrical arcing and a subsequent fire hazard that could result from wiring with inadequate current-carrying capacity.