Airworthiness Directive 73-26-04
one-timeAD 73-26-04 · 1973-01-01 · other
Airworthiness Directives; threads with a brush and 1, 1, 1 Trichloroethane (MIL-T-81533), Naptha, or MEK (FED TT-M-261). Allow to dry completely after clean
Which aircraft AD 73-26-04 applies to
MakesThreads With A Brush And 1 1 1 Trichloroethane Naptha Or Mek Allow To Dry Completely After Cleaning Apply Primer Mil-S-22473 Grade T Form R To Bolt Threads And Allow To Dry Completely Apply Locking Sealant Mil-S-22473 Grade A Or Grade Av Or Loctite 271 On First Three Bolt Threads These Instructions Are Per Douglas Process Partially Over Nut Lubricate Nuts Bolt Threads And Washers With Mil-L-25681 Per Dps 1 22 Or With An Faa Western Region Approved Equivalent Lubricant If
ModelsT-81533
Whether AD 73-26-04 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 73-26-04 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.