Airworthiness Directive · Amendment 39-13161 · McDonnell Douglas Model MD-90-30 Airplanes
McDonnell Douglas Model MD-90-30 Airplanes
All Model MD-90-30 airplanes, certificated in any category.
This amendment adopts a new airworthiness directive (AD), applicable to all McDonnell Douglas Model MD-90-30 airplanes, that requires replacement of the starter relay of the auxiliary power unit (APU) with a new, improved relay. The actions specified by this AD are intended to prevent failure of the APU starter relay, which could result in depleted main airplane batteries, overheated APU starters, and damage to the wiring adjacent to the APU starter. This action is intended to address the identified unsafe condition.
