76-24-05 ROLLS-ROYCE (1971) LIMITED: Amendment 39-2781. Applies to Rolls-Royce Bristol Viper Mk 601-22 engines installed, or being held for installation on Hawker Siddeley/Beechcraft Hawker Model DH/BH-125 series airplanes, certificated in all categories.
Compliance is required within the next 150 hours time in service after the effective date of this AD, unless already accomplished.
To prevent possible turbine disc damage, replace the inner exhaust turbine cone assembly in accordance with the "Accomplishment Instructions" of Rolls-Royce Alert Service Bulletin No. 72-A69, dated May 1976, or an equivalent approved by the Chief, Aircraft Certification Staff, FAA, Europe, Africa, and Middle East Region, APO New York, N.Y. 09667.
This amendment becomes effective December 14, 1976.