Airworthiness Directive · Amendment 39-15863 · McDonnell Douglas Model MD-90-30 Airplanes
McDonnell Douglas Model MD-90-30 Airplanes
Superseded. A later AD replaced this one: AD 2010-21-16. Comply with the one in force.
This AD applies to McDonnell Douglas Model MD-90-30 airplanes, certificated in any category; as identified in Boeing Alert Service Bulletin MD90-29A021, Revision 1, dated August 29, 2008.
The FAA is adopting a new airworthiness directive (AD) for certain McDonnell Douglas Model MD-90-30 airplanes. This AD requires modifying the auxiliary hydraulic power system (including doing all applicable related investigative and corrective actions). This AD results from fuel system reviews conducted by the manufacturer, as well as reports of shorted wires in the right wheel well and evidence of arcing on the power cables of the auxiliary hydraulic pump. We are issuing this AD to prevent shorted wires or electrical arcing at the auxiliary hydraulic pump, which could result in a fire in the wheel well; and to reduce the potential of an ignition source adjacent to the fuel tanks, which, in combination with flammable fuel vapors, could result in a fuel tank explosion and consequent loss of the airplane.
You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
Within 18 months after the effective date of this AD, modify the auxiliary hydraulic power system and do all applicable related investigative and corrective actions by accomplishing all applicable actions specified in the Accomplishment Instructions of Boeing Alert Service Bulletin MD90-29A021, Revision 1, dated August 29, 2008. Do all applicable related investigative and corrective actions before further flight.
