Airworthiness directives › 2011-18-21
AD 2011-18-21 Airworthiness Directives; Rolls-Royce plc (RR) RB211-524 Series Turbofan Engines
Applicability*9
This AD applies to Rolls-Royce plc (RR) engine models RB211-524B-02, -524B3-02 engines and RB211-524B2, -524B4, -524C2, and -524D4 series engines with a front combustion liner assembly that incorporates RR Service Bulletin (SB) No. RB.211-72-7221 or RR SB No. RB.211-72-7998, but doesn't incorporate RR SB No. RB.211-72-9670 or RR SB No. RB.211-72-9764, and engine models RB211-524G and -524H series engines with a front combustion liner assembly that doesn't incorporate RR SB No. RB.211-72-9764.
Compliance
Engine inspections previously done using RR SB No. RB.211-72-B482, Revision 8, meet the requirements of this AD for the initial and repetitive inspections specified in paragraph (g) and Table 1 of this AD; and paragraph (h) and Table 2 of this AD.
Required actions
Borescope-inspect combustion liner head sections that have not been previously repaired. Use paragraphs 3.A.(1) through 3.A.(5) of the Accomplishment Instructions of RR Alert Service Bulletin (ASB) No. RB.211-72-AB482, Revision 9, dated July 28, 2003, and the compliance thresholds in Table 1 of this AD to do the inspections. Table 1—Combustion Liner Head Section—Not Previously Repaired Engine series Initial inspection Repetitive inspection Parts exceeding initial inspection cycles RB211-524C2, -524D4, -524G, and -524H Within 1,400 to 1,600 cycles-since-new (CSN) Within 200 cycles-since-last inspection (CSLI) Within 100 cycles-in-service (CIS) after the effective date of this AD. RB211-524B-02, -524B2, -524B3-02, and -524B4 Within 3,000 to 3,200 CSN Within 200 CSLI Within 200 CIS after the effective date of this AD.
Unsafe condition
You are responsible for having the actions required by this AD performed within the compliance times specified unless the actions have already been done.
Affected ADs
This AD supersedes AD 2004-26-05, Amendment 39-13917 (70 FR 680, January 5, 2005).
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