Is AD 2010-21-16 a recurring Airworthiness Directive?

No — AD 2010-21-16 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2010-21-16 apply to?

AD 2010-21-16 applies to Mcdonnell Douglas — models MD-90-30, MD-90. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2010-21-16

one-time

Official AD 2010-21-16 · FR doc 2010-25440 · 2010-10-14 · airframe

Airworthiness Directives; McDonnell Douglas Corporation Model MD-90-30 Airplanes

What this AD requires

We are superseding an existing airworthiness directive (AD) for the products listed above. That AD currently requires modifying the auxiliary hydraulic power system (including doing all applicable related investigative and corrective actions). This new AD requires these same actions, using corrected service information. This AD was prompted by fuel system reviews conducted by the manufacturer, as well as reports of electrically shorted wires in the right wheel well and evidence of arcing on the auxiliary hydraulic pump power cables, which are routed within the tire burst area. We are issuing this AD to prevent electrically shorted wires or arcing at the auxiliary hydraulic pump power cables, which could result in a fire in the wheel well. We are also issuing this AD to reduce the potential of an ignition source adjacent to the fuel tanks, which, in combination with flammable fuel vapors, could result in a fuel tank explosion and consequent loss of the airplane.

Which aircraft AD 2010-21-16 applies to

MakesMcdonnell Douglas

ModelsMD-90-30, MD-90

Applies to airplanes identified in Boeing Alert Service Bulletin MD90-29A021, Revision 2, dated March 16, 2010.

Whether AD 2010-21-16 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 2010-21-16 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.