Is AD 2011-20-07 a recurring Airworthiness Directive?

No — AD 2011-20-07 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2011-20-07 apply to?

AD 2011-20-07 applies to The Boeing Company — models 737-600, 737-700, 737-700C, 737-800, 737-900, 737. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2011-20-07

one-time

Official AD 2011-20-07 · FR doc 2011-24746 · 2011-09-30 · airframe

Airworthiness Directives; The Boeing Company Model 737-600, -700, -700C, -800, and -900 Series Airplanes

What this AD requires

We are superseding an existing airworthiness directive (AD) for the products listed above. That AD currently requires replacement of the power control relays in the P91 and P92 power distribution panels for the fuel boost and override pumps with new, improved relays having a ground fault interrupter (GFI) feature, or installation and maintenance of universal fault interrupters (UFIs) using a certain supplemental type certificate. This new AD continues to require the actions of the existing AD and also specifies which relays may be replaced by GFIs or UFIs. This AD was prompted by a need to clarify which relays may be replaced by installation of UFIs. We are issuing this AD to prevent pump housing burn-through due to electrical arcing, which could create a potential ignition source inside a fuel tank. This condition, in combination with flammable fuel vapors, could result in a fuel tank explosion and consequent loss of the airplane.

Which aircraft AD 2011-20-07 applies to

MakesThe Boeing Company

Models737-600, 737-700, 737-700C, 737-800, 737-900, 737

Applicable airplanes as identified in Boeing Alert Service Bulletin 737-28A1201, Revision 1, dated May 28, 2009.

Whether AD 2011-20-07 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 2011-20-07 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.