Is AD 2011-05-11 a recurring Airworthiness Directive?

Yes — AD 2011-05-11 requires a repetitive inspection every 18 months. Next-due depends on the aircraft's time in service.

Which aircraft does AD 2011-05-11 apply to?

AD 2011-05-11 applies to Boeing — models 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747SR. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2011-05-11

recurring

Official AD 2011-05-11 · FR doc 2011-5117 · 2011-03-10 · airframe

Airworthiness Directives; The Boeing Company Model 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747SR, and 747SP Series Airplanes

What this AD requires

We are superseding an existing airworthiness directive (AD) for the products listed above. That AD currently requires repetitive inspections and torque checks of the hanger fittings and strut forward bulkhead of the forward engine mount and adjacent support structure, and visual inspections of the internal angle and external bulkhead chord and detailed inspection of internal angles, and corrective actions if necessary. The existing AD also provides for an optional inspection. This new AD requires additional inspections of airplanes that have hi-lok bolts and collars at all of the Group B fastener locations, except fastener 13, and related investigative and corrective actions. This AD also requires repetitive inspections of the internal angle, and corrective actions if necessary. This AD also requires, for certain airplanes, replacing the fasteners, which terminates certain repetitive inspections. This AD was prompted by reports of undertorqued or loose fasteners, a cracked bulkhead chord, and a fractured back-up angle. We are issuing this AD to detect and correct loose fasteners and/or damaged or cracked hanger fittings, back-up angles, and bulkhead of the forward engine mount, which could lead to failure of the hanger fitting and bulkhead and consequent separation of the engine from the airplane.

Repetitive inspection. Re-inspect every 18 months. The next-due date/hours depend on this aircraft’s time in service — a records report computes it from the logbooks.

Which aircraft AD 2011-05-11 applies to

MakesBoeing

Models747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747SR, 747SP, 747

Applies to airplanes identified in Boeing Alert Service Bulletin 747-54A2203, Revision 2, dated July 9, 2009.

Whether AD 2011-05-11 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:

Method of compliance — The specific action taken (inspected, replaced, modified) and to what revision.

Date — When the work was done.

Aircraft time — Total time in service / tach at compliance — how recurring next-due is computed.

Signature & certificate — The A&P/IA who returned it to service, with certificate number.

Is AD 2011-05-11 complied with on your aircraft?

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.