Airworthiness Directives; Hamilton Sundstrand Power Systems T-62T-46C12 Auxiliary Power Units
airworthiness · Rule · Final rule. · Published 2009-10-16 · Effective 2009-11-20 · 74 FR 53159
Document
Document number
E9-24396
Federal Register citation
74 FR 53159
Type
Rule
Action
Final rule.
Category
airworthiness
Publication date
2009-10-16
Effective date
2009-11-20
FAA docket
Docket No. FAA-2009-0247
Abstract
The FAA is adopting a new airworthiness directive (AD) for Hamilton Sundstrand Power Systems T-62T-46C12 auxiliary power units (APUs). This AD requires upgrading the software in the APU full- authority digital controller (FADEC) from software version 02.01.000 to version 03.00.000. This AD results from two reports of APU compartment explosions due to over-fueling of the APU at low revolutions-per-minute during the start sequence. We are issuing this AD to prevent over- fueling of the APU during the start sequence, which could lead to fuel explosions, injury, and damage to the APU and the airplane.