# AD 80-08-12: Fuel Pump Drive Coupling Splines - Type: Airworthiness directive - Status: Current - Products: Pratt & Whitney Canada PT6A-11, PT6A-112, PT6A-135, PT6A-15AG, PT6A-20, PT6A-20A, PT6A-20B, PT6A-21, PT6A-25, PT6A-25A, PT6A-27, PT6A-28 and 15 more - Effective: April 18, 1980 - Superseded by: Nothing supersedes this AD - Product type: Engine - Amendment: 39-3748 - Registered aircraft: 3,368 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/A53BA728AD2D725F862568400060A99A.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/80-08-12 ## The airworthiness directive 80-08-12 PRATT & WHITNEY AIRCRAFT OF CANADA, LIMITED: Amendment 39-3748. Applies to Pratt & Whitney Aircraft of Canada, Limited PT6A-6, -6A, -6B, -6/C20, -11, -15AG, -20, -20A, -20B, -21, -25, -25A, -27, -28, -34, -34B, -34AG, -36, -41, -45A, -45B, -112, -135 turboprop engines and Pratt & Whitney Aircraft PT6A-20A, -25, -27, -28, -34 turboprop engines incorporating Part Number 02-14910-01 fuel pump coupling. Compliance required as indicated unless previously accomplished. To preclude wear of the fuel pump drive coupling splines which results in an engine flameout condition, accomplish the following: a. Within the next 50 hours in service after the effective date of this AD for engines which have had a fuel pump removed within the last 200 hours in service, inspect 02-14910-01 fuel pump drive coupling for wear or damage. If the fuel pump drive coupling is worn or damaged replace the fuel pump drive coupling with a new coupling with the same part number or 5006050 coupling assembly in accordance with Paragraph 2, Accomplishment Instructions, in Pratt & Whitney Aircraft of Canada, Limited Service Bulletin Nos. 1316, 3139 or 12025 as applicable or an approved equivalent inspection and parts. If 02-14910-01 coupling is installed repeat above inspection each 200 hours in service thereafter until Paragraph b is accomplished. b. For all engines, prior to July 1, 1981, replace 02-14910-01 fuel pump drive coupling with 5006050 coupling assembly in accordance with Paragraph 2, Accomplishment Instructions in Pratt & Whitney Aircraft of Canada, Limited Service Bulletin Nos. 1316, 3139 or 12025 as applicable or approved equivalent inspection and parts. When 5006050 coupling assembly is installed, the inspection requirements of this AD no longer apply. Aircraft may be flown to a base for performance of maintenance required by this AD per FAR 21.197 or FAR 21.199. All equivalent inspections and parts must be approved by the Chief, Engineering & Manufacturing Branch, of the Eastern Region of the FAA. (Pratt & Whitney Aircraft of Canada, Limited Service Bulletin Nos. 1316, 3139 or 12025 pertain to this subject.) This amendment is effective April 18, 1980. ## Affected data sheets (1) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS E4EA](https://openairdocs.org/tcds/E4EA): Pratt & Whitney Canada Corp.; names 19 of 54 models: PT6A-20B, PT6A-21, PT6A-45B, PT6A-6B, PT6A-6/C20, PT6A-36, PT6A-41, PT6A-6… ## Registered aircraft it may apply to (OpenAirDocs) Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment. - Aircraft: 3,368 (0 by airframe model, 3,368 by engine model) - Makers: Beech 722, Air Tractor 668, Cessna 470, Raytheon 314, Piper 252, Pilatus 172, Quest 138, Dehavilland 119, Socata 110, Kodiak 69 Models with the most aircraft: - [Pratt & Whitney PT6A series](https://openairdocs.org/engine/pratt-whitney-pt6a-series): 2,217 aircraft (engine model) - [Pratt & Whitney Canada PT6A-34AG](https://openairdocs.org/engine/pratt-whitney-canada-pt6a-34ag): 269 aircraft (engine model) - [Pratt & Whitney Canada PT6A-34 series](https://openairdocs.org/engine/pratt-whitney-canada-pt6a-34-series): 230 aircraft (engine model) - [Pratt & Whitney Canada PT6A-6 series](https://openairdocs.org/engine/pratt-whitney-canada-pt6a-6-series): 170 aircraft (engine model) - [Pratt & Whitney Canada PT6A-21](https://openairdocs.org/engine/pratt-whitney-canada-pt6a-21): 76 aircraft (engine model) - [Pratt & Whitney PT6 series](https://openairdocs.org/engine/pratt-whitney-pt6-series): 43 aircraft (engine model) - [Pratt & Whitney PT6A-34 series](https://openairdocs.org/engine/pratt-whitney-pt6a-34-series): 42 aircraft (engine model) - [Pratt & Whitney Canada PT6A-41](https://openairdocs.org/engine/pratt-whitney-canada-pt6a-41): 42 aircraft (engine model) - [U/A Canada PT6A-41](https://openairdocs.org/engine/u-a-canada-pt6a-41): 42 aircraft (engine model) - [Pratt & Whitney Canada PT6A-15AG](https://openairdocs.org/engine/pratt-whitney-canada-pt6a-15ag): 40 aircraft (engine model) - [Pratt & Whitney Canada PT6A-27 series](https://openairdocs.org/engine/pratt-whitney-canada-pt6a-27-series): 30 aircraft (engine model) - [Pratt & Whitney PT6A-27 series](https://openairdocs.org/engine/pratt-whitney-pt6a-27-series): 28 aircraft (engine model) - [Pratt & Whitney Canada PT6A-135](https://openairdocs.org/engine/pratt-whitney-canada-pt6a-135): 28 aircraft (engine model) - [Pratt & Whitney PT6A-28 series](https://openairdocs.org/engine/pratt-whitney-pt6a-28-series): 25 aircraft (engine model) - [Pratt & Whitney Canada PT6A-20](https://openairdocs.org/engine/pratt-whitney-canada-pt6a-20): 21 aircraft (engine model) - [Pratt & Whitney Canada PT6A-112](https://openairdocs.org/engine/pratt-whitney-canada-pt6a-112): 20 aircraft (engine model) - [Pratt & Whitney Canada PT6A-28 series](https://openairdocs.org/engine/pratt-whitney-canada-pt6a-28-series): 12 aircraft (engine model) - [Pratt & Whitney Canada PT6A-11](https://openairdocs.org/engine/pratt-whitney-canada-pt6a-11): 5 aircraft (engine model) - [Pratt & Whitney Canada PT6A-25A](https://openairdocs.org/engine/pratt-whitney-canada-pt6a-25a): 5 aircraft (engine model) - [Pratt & Whitney PT6A-20A series](https://openairdocs.org/engine/pratt-whitney-pt6a-20a-series): 4 aircraft (engine model) All 30 models: https://openairdocs.org/ad/80-08-12/models.md Every aircraft: https://openairdocs.org/ad/80-08-12/aircraft.md Its text cites no advisory circulars or STCs. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.