Airworthiness directives › 2006-25-12
AD 2006-25-12 Airworthiness Directives; Rolls-Royce Corporation 501-D Series Turboprop Engines
Models named: 340, 440. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to Rolls-Royce Corporation (formerly Allison Engine Company) (RRC) 501-D series turboprop engines. These engines are installed on, but not limited to, Lockheed 188 series and 382 series turboprop airplanes, Airbus 377SG5-F (Super Guppy) airplanes, and Convair Models 340 and 440 airplanes which have RRC 501-D series turboprop engines installed under Supplemental Type Certificate No. SA4-1100. These latter models are commonly referred to as Convair 580/580A or 5800 models. (d) This AD results from RRC reevaluating and revising component life limits for 501-D22 series turboprop engines. We are issuing this AD to prevent uncontained turbine rotor failure resulting in an in-flight engine shutdown and possible damage to the airplane.
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. 501-D13 Series Engines (f) For 501-D13 series engines, remove turbine wheels and spacers from service as specified in the following Table 1: Table 1.—501-D13 Series Life Limits Part name Part No. Life limit for wheels that have complied with commercial overhaul information letter (COIL) 401, dated May 1978 Life limit for wheels that have not complied with COIL 401, dated May 1978 (1) Second-stage turbine wheel assembly 6847142 and 6876892 Remove from service before or upon accumulating 16,000 cycles-in-service (CIS) Remove from service before or upon accumulating 12,000 CIS. (2) Third-stage turbine wheel assembly 6845883 and 6849743 Remove from service before or upon accumulating 13,000 CIS Remove from service before or upon accumulating 10,000 CIS. (3) Fourth-stage turbine wheel assembly 6876468 Remove from service before or upon accumulating 24,000 CIS Remove from service before or upon accumulating 18,000 CIS. 501-D22 Series Engines (g) For 501-D22 series engines, remove turbine wheels and spacers from service as specified in the following Table 2: Table 2.—501-D22 Series Life Limits Part name Part No. Remove from service (1) Third-stage turbine wheel assembly 6855083 Before or upon accumulating 10,000 cycles-in-service (CIS). (2) 1st-2nd-stage spacer assembly 6844632, 23033463, 23064854, and 23064858 Before or upon accumulating 4,700 CIS. (3) 1st-2nd-stage spacer assembly 23056966 (i) Before or upon accumulating 8,000 CIS. (ii) If the 1st-2nd-stage spacer assembly passes the hardness criteria in RRC Commercial Engine Bulletin No. CEB-A-72-1135, Revision 2, dated July 11, 2003, then before or upon accumulating 10,000 CIS. (4) 2nd-3rd-stage spacer assembly 23033456 Before or upon accumulating 4,200 CIS. (5) 2nd-3rd-stage spacer assembly 23033464 and 6842683 Before or upon accumulating 5,200 CIS. (6) 3rd-4th-stage spacer assembly 6844794 prior to revision letter “R” Before or upon accumulating 5,100 CIS. Alternative Methods of
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1