Airworthiness Directive · Amendment 39-11570 · 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 MD11-30A020, Revision 03, dated May 5, 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 (c) 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 10 amp circuit breakers with 5 amp circuit breakers in the left and right windshield anti-ice power controllers; and replacement of the anti-ice control panel with a new or modified panel, or modification and reidentification of the anti-ice control panel. This amendment is prompted by reports of smoke and sparks emanating from the anti-ice control panel in the cockpit. The actions specified by this AD are intended to prevent burnt internal circuit boards caused by a short in either the engine or airfoil anti-ice valve, or the windshield anti-ice controller, which could result in smoke in the cockpit.
To prevent burnt internal circuit boards caused by a short in either the engine or airfoil anti-ice valve, or windshield anti-ice controller, which could result in smoke in the cockpit, accomplish the following:
(a) Within 1 year after the effective date of this AD, replace the 10 amp circuit breakers with 5 amp circuit breakers in the left and right windshield anti-ice power controllers, and accomplish either paragraph (a)(1) or (a)(2) of this AD, in accordance with McDonnell Douglas Alert Service Bulletin MD11-30A020 Revision 03, dated May 5, 1999.
(1) Option 1. Replace the anti-ice control panel and return the panel to Honeywell Inc. for modification and reidentification in accordance with Option 1 of the service bulletin.
(2) Option 2. Modify and reidentify the anti-ice control panel in accordance with Option 2 of the service bulletin.
Note 2: Replacements, modifications, and reidentifications accomplished prior to the effective date of this AD in accordance with McDonnell Douglas Service Bulletin MD11-30-020, dated March 6, 1995; Revision 01, dated February 20, 1996; or Revision 02, dated August 25, 1997; are considered acceptable for compliance with the requirements of paragraph (a) of this AD.
(b) As of the effective date of this AD, no person shall install an anti-ice control panel, part number 4059030-901 or -902, on any airplane, unless it has been modified and reidentified as part number 4059030-911 or -912, in accordance with paragraph (a)(1) or (a)(2) of this AD.
