Airworthiness Directive 86-25-06
one-timeAirworthiness Directives; the tank. (3) Install a flush quick drain valve, P/N F391-18 or equivalent. Note: These pipe thread valves produced by Manufacturi
Which aircraft AD 86-25-06 applies to
Compliance is gated to installation of the specific quick-drain valve part number noted in the teaser — confirm applicable model from the full AD text before use.
Whether AD 86-25-06 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:
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.