Airworthiness Directive · Amendment 39-11846 · McDonnell Douglas Model MD-11 Series Airplanes
McDonnell Douglas Model MD-11 Series Airplanes
Superseded. A later AD replaced this one: AD 2004-12-16. Comply with the one in force.
Model MD-11 series airplanes, as listed in Boeing Alert Service Bulletin MD11-24A181, dated June 27, 2000; 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) that is applicable to certain McDonnell Douglas Model MD-11 series airplanes. This action requires repetitive inspections to verify operation of the remote control circuit breakers (RCCB) of the alternating current (AC) cabin bus switch, and replacement of any discrepant RCCB with a new RCCB. This action is necessary to prevent propagation of smoke and fumes in the cockpit and passenger cabin due to an inoperable RCCB of the AC cabin bus switch during smoke and fume isolation procedures. This action is intended to address the identified unsafe condition.
To prevent propagation of smoke and fumes in the cockpit and passenger cabin due to an inoperable remote control circuit breaker (RCCB) of the alternating current (AC) cabin bus switch during smoke and fume isolation procedures, accomplish the following:
(a) Within 45 days after the effective date of this AD, perform an inspection to verify operation of the RCCB's of the AC cabin bus switch in accordance with Boeing Alert Service Bulletin MD11-24A181, dated June 27, 2000.
(1) If all RCCB's are operating properly, repeat the inspection thereafter at intervals not to exceed 700 flight hours.
(2) If any RCCB is NOT operating properly, prior to further flight, replace the failed RCCB with a new RCCB in accordance with the service bulletin. Repeat the inspection thereafter at intervals not to exceed 700 flight hours.
