Airworthiness Directive · Amendment 39-11571 · McDonnell Douglas Model MD-11 Series Airplanes
McDonnell Douglas Model MD-11 Series Airplanes
Superseded. A later AD replaced this one: AD 2001-17-12. Comply with the one in force.
Model MD-11 series airplanes, as listed in McDonnell Douglas Service Bulletin MD11-24-128, Revision 1, dated July 30, 1999; certificated in any category.
Note 1: This AD applies to each airplane identified in the preceding applicability provision, regardless of whether it has been modified, altered, or repaired in the area subject to the requirements of this AD. For airplanes that have been modified, altered, or repaired so that the performance of the requirements of this AD is affected, the owner/operator must request approval for an alternative method of compliance in accordance with paragraph (b) of this AD. The request should include an assessment of the effect of the modification, alteration, or repair on the unsafe condition addressed by this AD; and, if the unsafe condition has not been eliminated, the request should include specific proposed actions to address it.
This amendment adopts a new airworthiness directive (AD), applicable to certain McDonnell Douglas Model MD-11 series airplanes, that requires replacement of the air driven generator (ADG) wire assembly with a new, increased length wire assembly. This amendment is prompted by a report of loose terminal attachment hardware on the ADG power monitor relay due to a stress condition on the terminal attachment points. The actions specified by this AD are intended to prevent loss of the charging capability of the aircraft battery. Loss of the charging capability of the aircraft battery, coupled with a loss of all normal electrical power, could prevent continued safe flight and landing of the airplane.
To prevent loss of the charging capability of the air driven generator (ADG), that when coupled with a loss of all normal electrical power, could prevent continued safe flight and landing of the airplane, accomplish the following:
(a) Within 1 year after the effective date of this AD, replace the ADG wire assembly, part number (P/N) ACS9006-501, with a new, increased length wire assembly, P/N ACS9006-502, in accordance with McDonnell Douglas Service Bulletin MD11-24-128, dated September 17, 1998, or Revision 1, dated July 30, 1999.
