Airworthiness Directive 2004-13-03
one-timeAirworthiness Directives; Rolls-Royce (1971) Limited, Bristol Engine Division Model Viper Mk.601-22 Turbojet Engine
What this AD requires
The FAA is adopting a new airworthiness directive (AD) for Rolls-Royce (1971) Limited, Bristol Engine Division (RR) Model Viper Mk.601-22 turbojet engines. This AD requires reducing the life of certain 1st stage turbine rotor blades from 7,000 hours time-in-service (TIS) to 4,600 hours TIS, and provides a drawdown schedule for blades that have already exceeded the new reduced life limit. This AD results from the manufacturer's investigations into failures of 1st stage turbine rotor blades. We are issuing this AD to prevent multiple failures of 1st stage turbine rotor blades that could result in a dual- engine shutdown.
Which aircraft AD 2004-13-03 applies to
Applies only to engines with 1st stage turbine blades, part numbers V926000, V926293, or V926319, installed. These engines are installed on, but not limited to, Raytheon HS.125 Series 600 and BH.125 Series 600 airplanes. Manufacturer identified in source text as Rolls-Royce (1971) Limited, Bristol Engine Division.
Whether AD 2004-13-03 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.