Airworthiness Directive · Amendment 39-17309 · Rolls-Royce Deutschland Ltd & Co KG Turbofan Engines
Rolls-Royce Deutschland Ltd & Co KG Turbofan Engines
Superseded. A later AD replaced this one: AD 2014-07-02. Comply with the one in force.
This AD applies to all Rolls-Royce Deutschland Ltd & Co KG BR700-715A1-30, BR700-715B1-30, and BR700-715C1-30 turbofan engines.
We are adopting a new airworthiness directive (AD) for all Rolls-Royce Deutschland Ltd & Co KG BR700-715A1-30, BR700-715B1-30, and BR700-715C1-30 turbofan engines. This AD requires a one-time removal from service of the high-pressure (HP) compressor stages 1 to 6 rotor disc assembly before exceeding certain thresholds. This AD was prompted by a report of silver chloride-induced stress corrosion cracking of the HP compressor stages 1 to 6 rotor disc assembly, identified during overhaul. We are issuing this AD to prevent failure of the HP compressor stages 1 to 6 rotor disc assembly, which could result in uncontained failure of the engine and damage to the airplane.
Unless already done, do the following actions.
For BR700-715A1-30 turbofan engines operated under the Hawaiian Flight Mission only, do the following:
(1) If the HP compressor stages 1 to 6 rotor disc assembly has accumulated 15,700 flight cycles since new or fewer on the effective date of this AD, remove the rotor disc assembly from service before exceeding 16,000 flight cycles since new (CSN).
(2) If the HP compressor stages 1 to 6 rotor disc assembly has accumulated more than 15,700 flight CSN on the effective date of this AD, remove the rotor disc assembly from service within 300 flight cycles.
For BR700-715A1-30, BR700-715B1-30, and BR700-715C1-30 turbofan engines (all flight missions except the Hawaiian Flight Mission), do the following:
(1) If the HP compressor stages 1 to 6 rotor disc assembly has accumulated 13,700 flight CSN or fewer on the effective date of this AD, remove the rotor disc assembly from service before exceeding 14,000 flight CSN.
(2) If the HP compressor stages 1 to 6 rotor disc assembly has accumulated more than 13,700 flight cycles since new on the effective date of this AD, remove the rotor disc assembly from service within 300 flight cycles.
Performing the one-time removal from service of the stages 1 to 6 rotor disc assembly, as specified in this AD, is terminating action to this AD.
For the purpose of this AD, flight cycles is the total flight CSN on the HP compressor stages 1 to 6 rotor disc assembly, without any pro-rated calculations applied for different flight missions. Guidance on calculating total flight cycles can be found in Rolls-Royce Deutschland Ltd & Co KG Notice to Operators BR715 engines NTO: No. 184, dated October 25, 2012.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
