Airworthiness Directive 2011-16-06
one-timeAirworthiness Directives; The Boeing Company Model 747-400 and -400F Series Airplanes
What this AD requires
We are adopting a new airworthiness directive (AD) for the products listed above. This AD requires a general visual inspection for cracks and holes of the main equipment center (MEC) drip shields, and repairs if necessary; installation of a fiberglass reinforcing overcoat; and, for certain airplanes, installation of stiffening panels to the MEC drip shields. This AD was prompted by a report of a loss of bus control unit number 1 and generator control units numbers 1 and 2 while the airplane was on the ground, and multiple operator reports of cracked MEC drip shields. We are issuing this AD to prevent water penetration into the MEC, which could result in the loss of flight critical systems.
Which aircraft AD 2011-16-06 applies to
Applies to airplanes identified in Boeing Alert Service Bulletin 747-25A3588, Revision 1, dated April 7, 2011.
Whether AD 2011-16-06 actually applies to your aircraft (by serial and installed parts) and whether it’s already complied with comes from that aircraft’s records.
How AD compliance is recorded
A valid compliance record (14 CFR 43.9) states:
Tailplate reads a tail number’s logbooks and matches every applicable AD — including this one — to its compliance evidence, with recurring next-due dates computed.
Look up a tail number →Read the full directive (Federal Register)Applicability is derived from the FAA directive corpus and is advisory, not a legal airworthiness determination. Compliance is established only from an aircraft’s actual records.