Is AD 90-25-05 R1 a recurring Airworthiness Directive?

No — AD 90-25-05 R1 is a one-time directive. Verify it was complied with in the aircraft's records.

Airworthiness Directive 90-25-05 R1

Q: Which aircraft does AD 90-25-05 R1 apply to?

AD 90-25-05 R1 applies to Viking Air Limited, Boeing — models DHC-4, DHC-4A, 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F. Serial/part conditions may narrow it to specific aircraft.

one-time

AD 90-25-05 R1 · 1990-01-01 · airframe

Airworthiness Directives; Viking Air Limited Model (Caribou) DHC-4 and (Caribou) DHC-4A Airplanes; and Boeing Model 747-100, 747-100B, 747-100B SUD, 747-200

Which aircraft AD 90-25-05 R1 applies to

MakesViking Air LimitedBoeing

ModelsDHC-4, DHC-4A, 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, 747-400F, 747SR, 747SP, 747

Final rule; corrections notice combining separate ADs: one applies to Viking Air Limited (Caribou) DHC-4 and DHC-4A airplanes; two others apply to all listed Boeing 747 series airplanes.

Whether AD 90-25-05 R1 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 90-25-05 R1 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 →

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.