Airworthiness directives › 2019-05-02
AD 2019-05-02 Airworthiness Directives; Rolls-Royce plc Turbofan Engines
Applicability*9
This AD applies to all Rolls-Royce plc (RR) RB211-Trent 970-84 and RB211-Trent 972-84 turbofan engines with a drains mast, part number (P/N) KH31996 or FW29847, installed.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) For Group 1 engines, within 24 months after November 22, 2017 (the effective date of AD 2017-22-13), or within 24 months time since new, whichever occurs later, and thereafter, at intervals not to exceed 24 months since previous inspection, visually inspect the external areas of the transition duct area of the drains mast for a crack using Accomplishment Instructions, paragraph 3.A.(1), of RR Alert Non-Modification Service Bulletin (NMSB) RB.211-71-AJ576, Revision 1, dated July 11, 2018. If a crack is found, do one of the following before further flight: (i) Remove and replace the drains mast with a part eligible for installation, or (ii) Seal the crack using the Accomplishment Instructions, paragraph 3.A.(1).(c).(ii).(2), of RR Alert NMSB RB.211-71-AJ576, Revision 1, dated July 11, 2018, and within 100 flight cycles after sealing the crack, remove and replace the drains mast with a part eligible for installation. (2) For Group 2 engines, within 24 months after the effective date of this AD, and thereafter, at intervals not to exceed 24 months since previous inspection, visually inspect the external areas of the transition duct area of the drains mast for a crack using Accomplishment Instructions, paragraph 3.A.(1), of RR Alert NMSB RB.211-71-AJ576, Revision 1, dated July 11, 2018. If a crack is found, do one of the following before further flight: (i) Remove and replace the drains mast with a part eligible for installation, or (ii) Seal the crack using the Accomplishment Instructions, paragraph 3.A.(1).(c).(ii).(2), of RR Alert NMSB RB.211-71-AJ576, Revision 1, dated July 11, 2018, and within 100 flight cycles after sealing the crack, remove and replace the drains mast with a part eligible for installation.
Unsafe condition
This AD was prompted by RR in-service findings that indicated a need to include part number (P/N) FW29847 drains mast and additional RR RB211-Trent 900 turbofan engines to the affected population. We are issuing this AD to prevent failure of the drains mast. The unsafe condition, if not addressed, could result in engine fire and damage to the airplane.
Affected ADs
This AD replaces AD 2017-22-13, Amendment 39-19093 (82 FR 51550, November 7, 2017).
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