Airworthiness Directive · Amendment 39-14419 · Boeing Model 747-400, 747-400D, and 747-400F Series Airplanes
Boeing Model 747-400, 747-400D, and 747-400F Series Airplanes
This AD applies to Boeing Model 747-400, 747-400D, and 747-400F series airplanes, certificated in any category; as identified in Boeing Alert Service Bulletin 747-53A2505, dated March 17, 2005.
The FAA is adopting a new airworthiness directive (AD) for certain Boeing Model 747-400, 747-400D, and 747-400F series airplanes. This AD requires repetitive detailed inspections for damage (degraded finish; missing, lifted, peeling, or blistering paint; or signs of corrosion) of the interior skin in the forward and aft cargo compartments, and corrective actions if necessary. This AD results from reports of skin corrosion on four Boeing Model 747 series airplanes that were delivered between 1995 and 1999. We are issuing this AD to detect and correct corrosion, which can penetrate the thickness of the skin and cause cracking, and result in rapid decompression 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 12 months after the effective date of this AD, do a detailed inspection for damage (degraded finish; missing, lifted, peeling, or blistering paint; or signs of corrosion) of the interior skin in the forward and aft cargo compartments. Do any applicable corrective actions before further flight. Except as required by paragraphs (g) and (h) of this AD, do all actions in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin 747-53A2505, dated March 17, 2005. Repeat the inspection thereafter at intervals not to exceed 48 months until accomplishing task number C53-125-01 of Boeing Document Number D6-36022, “Aging Airplane Corrosion Prevention and Control Program—Model 747,” Revision A, dated July 28, 1989, or until accomplishing tasks S53-520 and S53-550 of Boeing Document D621U400-MRB, “B747-400 Maintenance Review Board Report,” Revision E, dated May 2003.
Note 1: For the purposes of this AD, a detailed inspection is: “An intensive examination of a specific item, installation, or assembly to detect damage, failure, or irregularity. Available lighting is normally supplemented with a direct source of good lighting at an intensity deemed appropriate. Inspection aids such as mirror, magnifying lenses, etc., may be necessary. Surface cleaning and elaborate procedures may be required.”
If any corrosion damage that exceeds the limits specified in the structural repair manual is found during any action required by this AD, and Boeing Alert Service Bulletin 747-53A2505, dated March 17, 2005, specifies to contact Boeing for repair instructions: Before further flight, repair the damage using a method approved in accordance with the procedures specified in paragraph (i) of this AD.
Although Boeing Alert Service Bulletin 747-53A2505, dated March 17, 2005, specifies to submit to the manufacturer a report of the inspection program and details of any corrosion damage and peeling paint primer, this AD does not include those actions.
