Airworthiness Directive · Amendment 39-14853 · Rolls-Royce Corporation 501-D Series Turboprop Engines
Rolls-Royce Corporation 501-D Series Turboprop Engines
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.
The FAA is superseding an existing airworthiness directive (AD) for Rolls-Royce Corporation (RRC) 501-D series turboprop engines. That AD requires removal from service of certain turbine rotor components at reduced life limits. This AD requires the same actions but adds two new life limits. 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.
You are responsible for having the actions required by this AD performed within the compliance times specified unless the actions have already been done.
For 501-D13 series engines, remove turbine wheels and spacers from service as specified in the following Table 1:
| 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. |
For 501-D22 series engines, remove turbine wheels and spacers from service as specified in the following Table 2:
| 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. |
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Engines
