TailplateTailplate
Run a report

Airworthiness Directive 98-25-14

one-time
Official AD 98-25-14 · FR doc 98-32800 · 1998-12-14 · turbine engine

Airworthiness Directives; Rolls-Royce Limited, Bristol Engines Division and Rolls-Royce (1971) Limited, Bristol Engines Division Viper Series Turbojet Engines

What this AD requires

This amendment adopts a new airworthiness directive (AD), applicable to Rolls-Royce Limited, Bristol Engines Division and Rolls- Royce (1971) Limited, Bristol Engines Division, Viper series turbojet engines, that requires a one-time visual inspection of the barometric flow control unit (BFCU) augmentor and bypass valve joint washer for joint washer integrity, and replacement, if necessary, with serviceable parts. This amendment is prompted by a report of a high pressure fuel leak at the BFCU augmentor and bypass valve assembly joint, washer interface. The actions specified by this AD are intended to prevent a high pressure fuel leak, which could result in an engine nacelle fire and damage to the aircraft.

Which aircraft AD 98-25-14 applies to

MakesRolls-Royce
ModelsViper Mk. 521, Viper Mk. 522, Viper Mk. 526, Viper Mk. 601, Viper

Whether AD 98-25-14 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 98-25-14 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 →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.