Airworthiness directives › 2011-22-03
AD 2011-22-03 Airworthiness Directives; Rolls-Royce Corporation Turbofan Engines
Applicability*9
This AD applies to Rolls-Royce Corporation (RRC) AE 3007A, AE 3007A1/1, AE 3007A1, AE 3007A1/3, AE 3007A1E, AE 3007A1P, and AE 3007A3 turbofan engines, with any of the 6th-through-13th stage compressor wheel part numbers (P/Ns) in Table 1 of this AD installed. Table 1—6th-Through-13th Stage Compressor Wheel P/Ns Affected by This AD Compressor wheel stage Wheel P/Ns with chrome-carbide coated knife seals Wheel P/Ns with uncoated knife seals 6th 23074717 23062666, 23071261, 23071396 7th 23074719, 23074217 23062667, 23071262, 23071397 8th 23074721 23061628, 23071263 9th 23074722 23061629, 23071264 10th 23074723 23061630, 23071265 11th 23074724 23061631, 23066231 12th 23074725 23061632, 23071267 13th 23074213, 23074726 23061633, 23071268
Compliance
The initial inspection compliance times for the 6th-through-13th stage compressor wheels are based on cycles-since-new (CSN) and cycles-in-service (CIS) of their 12th and 13th stage compressor wheels. For engines that one or both 12th and 13th stage compressor wheels have chrome-carbide coated knife edge seals, use the compliance times listed in Table 2 of this AD. For engines that both 12th and 13th stage compressor wheels do not have chrome-carbide coated knife edge seals, use the compliance times listed in Table 3 of this AD. (1) Perform a one-time comprehensive eddy current inspection (ECI) of the 6th-through-13th stage compressor wheel knife edge seals for cracks, using paragraph 2, Accomplishment Instructions, of RRC Alert Service Bulletin (ASB) No. AE 3007A-A-72-386, Revision 4, dated June 27, 2011 (Completion of this one-time comprehensive ECI relieves you thereafter of the repetitive inspection requirements of this AD); or (2) Perform an initial ECI of the 6th-through-13th stage compressor wheel outer circumferences for cracks, using paragraph 2, Accomplishment Instructions, of RRC ASB No. AE 3007A-A-72-390, Revision 3, dated June 27, 2011. Table 2—Initial Inspection Compliance Times for Engines, That One or Both 12th and 13th Stage Compressor Wheels Have Chrome-Carbide Coated Knife Edge Seals For 12th and or 13th stage compressor wheels with the following CSN on the effective date of this AD Initially inspect after the effective date of this AD (i) 18,185 or more CSN Within 15 CIS. (ii) 16,700 to 18,184 CSN Before accumulating 18,200 CSN. (iii) 16,000 to 16,699 CSN Within 1,500 CIS. (iv) 15,100 to 15,999 CSN Within 2,000 CIS. (v) 14,300 to 15,099 CSN Within 2,800 CIS. (vi) 13,000 to 14,299 CSN Within 3,400 CIS. (vii) 12,300 to 12,999 CSN Within 4,000 CIS. (viii) 11,200 to 12,299 CSN Within 4,600 CIS. (ix) 9,700 to 11,199 CSN Within 5,300 CIS. (x) Fewer than 9,700 CSN Before accumulating 15,000 CSN or at the next shop visit when the engine has more than 7,000 cycles, whichever occurs first. Table 3—Initial Inspection Compliance Times for Engines, That Both 12th and 13th Stage Compressor Wheels Do Not Have Chrome-Carbide Coated Knife Edge Seals For 12th and or 13th stage compressor wheels with the following CSN on the effective date of this AD: Initially inspect after the effective date of this AD: (i) 18,300 or more CSN Within 200 CIS. (ii) 16,000 to 18,299 CSN Within 1,500 CIS. (iii) 15,100 to 15,999 CSN Within 2,000 CIS. (iv) 14,300 to 15,099 CSN Within 2,800 CIS. (v) 13,000 to 14,299 CSN Within 3,400 CIS. (vi) 12,300 to 12,999 CSN Within 4,000 CIS. (vii) 11,200 to 12,299 CSN Within 4,600 CIS. (viii) 9,700 to 11,199 CSN Within 5,300 CIS. (ix) Fewer than 9,700 CSN Before accumulating 15,000 CSN or at the next shop visit when the engine has more than 7,000 cycles, whichever occurs first.
Required actions
(1) After passing the initial inspection, perform repetitive ECIs of the compressor wheel outer circumference, for cracks, within every 5,000 cycles-since-last-inspection (CSLI), using paragraph 2, Accomplishment Instructions, of RRC ASB No. AE 3007A-A-72-390, Revision 3, dated June 27, 2011; or (2) Perform a one-time comprehensive ECI of the 6th-through-13th stage compressor wheel knife edge seals for cracks, within 5,000 CSLI using paragraph 2, Accomplishment Instructions, of RRC ASB No. AE 3007A-A-72-386, Revision 4, dated June 27, 2011. Completion of this one-time ECI comprehensive inspection relieves you thereafter of the repetitive inspection requirements of this AD.
Unsafe condition
Comply with this AD within the compliance times specified, unless already done.
Affected ADs
None.
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