Airworthiness Directive 99-26-02
one-timeAirworthiness Directives; Boeing Model 747-400 and 767 Series Airplanes Powered by Pratt & Whitney PW4000 Series Engines
What this AD requires
This amendment adopts a new airworthiness directive (AD), applicable to certain Boeing Model 747-400 and 767 series airplanes, that requires replacement of the existing deactivation pin, pin bushing, and insert flange on each thrust reverser half, with new, improved components. This amendment is prompted by reports of partial deployment of deactivated thrust reversers during landing. The actions specified by this AD are intended to prevent failure of the thrust reverser deactivation pins, which could result in deployment of the thrust reverser in flight and consequent reduced controllability of the airplane.
Which aircraft AD 99-26-02 applies to
Applies to Boeing 747-400 series airplanes (per Boeing SB 747-78A2165 Rev 1) and Boeing 767 series airplanes (per Boeing Alert SB 767-78A0080), as applicable. Requires replacing the thrust reverser deactivation pin, pin bushing, and insert flange with new components; deactivation pins P/N 315T1604-2 or -5 do not preclude use of the new insert flange/bushing, but thrust reversers modified per this AD require the new, longer deactivation pin P/N 315T1604-6.
Whether AD 99-26-02 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 →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.