Airworthiness directives › 2017-22-13
AD 2017-22-13 Airworthiness Directives; Rolls-Royce plc Turbofan Engines
Applicability*9
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.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
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.
Unsafe condition
This AD was prompted by cracks found in the transition duct area of the drains mast. We are issuing this AD to prevent failure of the drains mast, engine fire, and damage to the airplane.
Affected ADs
None.
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