Airworthiness directives › 2009-08-51
AD 2009-08-51 Airworthiness Directives; Rolls-Royce Corporation (RRC) AE 3007A Series Turbofan Engines
Applicability*9
This AD applies to RRC AE 3007A series turbofan engines with high-pressure turbine (HPT) stage 2 wheels, part number (P/N) 23065892, 23069116, 23069438, 23069592, 23074462, 23074644, 23075345, 23084520, or 23084781, installed. These engines are installed on, but not limited to, Empresa Brasileira de Aeronautica S. A. (EMBRAER) EMB-135 and EMB-145 airplanes.
Compliance
You are responsible for having the actions required by this AD performed within the compliance times specified unless the actions have already been done. Eddy Current Inspection or Surface Wave Ultrasonic Test Inspection (f) Perform an eddy current inspection (ECI) or surface wave ultrasonic test (SWUT) inspection on each affected wheel by the cycle limit specified in Table 1 of this AD. Use paragraphs 2.A. through 2.C.(4) of RRC Alert Service Bulletin (ASB) AE 3007A-A-72-367, Revision 1, dated April 7, 2009, or use paragraphs 2.A through 2.M.(8) of RRC Service Bulletin (SB) AE 3007A-72-368, Revision 1, dated April 6, 2009, to perform the inspections. Table 1—Compliance Times for ECI or SWUT Inspection of the HPT Stage 2 Wheels by Cycles-Since-New (CSN) For HPT stage 2 wheels with CSN on the effective date of this AD: Remove or inspect: 17,500 or more Before the next flight. 15,560 to 17,499 Within 75 cycles-in-service (CIS). 15,000 to 15,559 Within 150 CIS. 14,700 to 14,999 Within 200 CIS. 14,000 to 14,699 Within 250 CIS. 13,580 to 13,999 Within 450 CIS. 12,460 to 13,579 Within 600 CIS. Installation Prohibition (g) After the effective date of this AD, don't return to service, any HPT stage 2 wheel that was installed in any RRC AE 3007A series turbofan engine removed from service as a result of paragraph (f) of this AD unless the HPT stage 2 wheel has passed an inspection specified in RRC ASB AE 3007A-A-72-367, Revision 1, dated April 7, 2009 or RRC SB AE 3007A-72-368, Revision 1, dated April 6, 2009. Removal From Service (h) After the effective date of this AD, remove from service any HPT stage 2 wheel covered by this AD that has accumulated 22,500 CSN. (i) After the effective date of this AD, don't install any HPT stage 2 wheel that has 22,500 or more CSN. Credit for Previous Inspections (j) HPT stage 2 wheels already inspected and passed using RRC ASB AE 3007A-A-72-367, Revision 1, dated April 7, 2009, or earlier issue; or RRC SB AE 3007A-72-368, Revision 1, dated April 6, 2009, or earlier issue, meet the requirements for the initial inspections specified in paragraph (f) of this AD. Alternative Methods of
Unsafe condition
This AD results from additional reports of cracks in the HPT stage 2 wheels identified from the required inspections in AD 2008-26-06. A revised risk assessment that includes these additional reports indicates we need to require a higher inspection rate. We are issuing this AD to prevent uncontained failure of the HPT stage 2 wheel and damage to the airplane.
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