Airworthiness Directive · Amendment 39-12017 · McDonnell Douglas Model MD-11 Series Airplanes
McDonnell Douglas Model MD-11 Series Airplanes
Model MD-11 series airplanes, as listed in McDonnell Douglas Alert Service Bulletin MD11-24A180, dated January 4, 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), applicable to certain McDonnell Douglas Model MD-11 series airplanes, that requires relocating the B7-28 bus located in the upper main circuit breaker in the rear cockpit observer's station from the lower to the upper terminals of the circuit breakers in Row P. This action is necessary to prevent insufficient clearance and contact between the B7- 28 bus and an adjacent panel, which could result in arcing damage, smoke, and/or fire in the upper main circuit breaker panel. This action is intended to address the identified unsafe condition.
To prevent insufficient clearance and contact between the B7-28 bus and an adjacent panel, which could result in arcing damage, smoke, and/or fire in the upper main circuit breaker panel, accomplish the following:
(a) Within 12 months after the effective date of this AD, relocate the B7-28 bus located in the upper main circuit breaker in the rear cockpit observer's station from the lower to the upper terminals of the circuit breakers in Row P in accordance with the Accomplishment Instructions of McDonnell Douglas Alert Service Bulletin MD11-24A180, dated January 4, 2000.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Aircraft
