Airworthiness Directive · Amendment 39-19093 · Rolls-Royce plc Turbofan Engines
Rolls-Royce plc Turbofan Engines
Superseded. A later AD replaced this one: AD 2019-05-02. Comply with the one in force.
This AD applies to Rolls-Royce plc (RR) RB211-Trent 970-84 and RB211-Trent 972-84 turbofan engines with a drains mast, part number (P/N) KH31996, installed.
We are adopting a new airworthiness directive (AD) for all Rolls-Royce plc (RR) RB211-Trent 970-84 and RB211-Trent 972-84 turbofan engines. This AD requires an inspection of the drains mast. This AD was prompted by cracks found in the transition duct area of the drains mast. We are issuing this AD to address the unsafe condition on these products.
Within 12 months time since new (TSN) or within 12 months after the effective date of this AD, whichever occurs later, visually inspect the external areas of the transition duct area of the drains mast for a crack, as depicted in Figure 1 of RR Alert Non-Modification Service Bulletin (NMSB) RB.211-71-AJ576, Initial Issue, dated March 17, 2017. If there is a crack:
(1) Before further flight, replace the drains mast with a part eligible for installation, or
(2) Before further flight, seal the crack using the Accomplishment Instructions, paragraph 3.B. of RR Alert NMSB RB.211-71-AJ576, Initial Issue, dated March 17, 2017, and within 100 flight cycles, remove and replace the drains mast with a part eligible for installation.
(1) For the purposes of this AD, a part eligible for installation is a part not listed in this AD, or a part that has passed the inspection required by this AD.
(2) For the purposes of this AD, a flight cycle is a take-off and landing.
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.
Engines
