Airworthiness Directive 85-04-01 R1
one-timeAD 85-04-01 R1 · 1985-01-01 · other
Airworthiness Directives; -T (S/Ns T201 through T287); SA226-AT (S/Ns AT001 through AT066); and SA226-TC (S/Ns TC201 through TC247) in which MIL-H- 5606 hyd
Which aircraft AD 85-04-01 R1 applies to
Makes-T Sa226-At And Sa226-Tc In Which Mil-H- 5606 Hydraulic Fluid Is Used Drain And Purge Main Hydraulic And Brake System Reservoirs And Refill These Reservoirs With Mil-H-83282 Fluid Change Placards On Both Reservoirs To Specify Mil-H-83282 Fluid On Or Before December 31
ModelsSA226-T, T201, T287, H-83282
Serial-conditional — narrows to serials T201–T287, AT001–AT066, TC201–TC247, T201–T287, AT001–AT066, TC201–TC247.
Whether AD 85-04-01 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 85-04-01 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.