Airworthiness Directive · Amendment 39-15305 · Boeing Model 747-200C and -200F Series Airplanes
Boeing Model 747-200C and -200F Series Airplanes
This AD applies to Boeing Model 747-200C and -200F series airplanes, certificated in any category; as identified in Boeing Alert Service Bulletin 747-25A3430, dated February 15, 2007.
The FAA is adopting a new airworthiness directive (AD) for certain Boeing Model 747-200C and -200F series airplanes. This AD requires, among other actions, installing mounting brackets, support angles, and moisture curtains in the main equipment center. This AD results from reports of water contamination in the electrical/ electronic units in the main equipment center. We are issuing this AD to prevent water contamination of the electrical/electronic units, which could cause the electrical/electronic units to malfunction, and as a consequence, could adversely affect the airplane's continued safe flight.
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 24 months after the effective date of this AD, install mounting brackets, support angles, and moisture curtains in the main equipment center, in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin 747-25A3430, dated February 15, 2007.
For airplanes identified as Group 1 and Group 3 airplanes in Boeing Alert Service Bulletin 747-25A3430, dated February 15, 2007: Prior to or concurrently with the requirements of paragraph (f) of this AD, install drip shields (including a drip pan assembly, drain tubing, and attaching hardware) over the forward, outboard halves of the E1-1 and E3-1 shelves in the main equipment bay, in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin 747-38A2073, Revision 3, dated May 22, 2003.
(h) Installation of drip shields before the effective date of this AD in accordance with paragraph (a) and Note 2 of AD 2001-24-30, amendment 39-12547, is acceptable for compliance with the corresponding actions specified in paragraph (g) of this AD.
