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80-08-12: Fuel Pump Drive Coupling Splines

FAA order 80-08-12 is an airworthiness directive in force since April 18, 1980. The FAA's subject line: Fuel Pump Drive Coupling Splines. It names the Pratt & Whitney Canada PT6A-11, Pratt & Whitney Canada PT6A-112, Pratt & Whitney Canada PT6A-135, Pratt & Whitney Canada PT6A-15AG, Pratt & Whitney Canada PT6A-20, Pratt & Whitney Canada PT6A-20A, Pratt & Whitney Canada PT6A-21, Pratt & Whitney Canada PT6A-25, Pratt & Whitney Canada PT6A-25A, Pratt & Whitney Canada PT6A-27, Pratt & Whitney Canada PT6A-28, Pratt & Whitney Canada PT6A-34, Pratt & Whitney Canada PT6A-34AG, Pratt & Whitney Canada PT6A-36, Pratt & Whitney Canada PT6A-41, Pratt & Whitney Canada PT6A-6, Pratt & Whitney Canada PT6A series, Pratt & Whitney PT6A-20A, Pratt & Whitney PT6A-28, Pratt & Whitney PT6A series engines: about 3,270 aircraft on the U.S. register today across them, though an order usually covers particular versions or serial numbers rather than every one. System: engine.

What it applies to as the FAA lists it

Kind of product: Engine
Makes: Pratt & Whitney Canada Corp.; Pratt & Whitney Division
Models: PT6A-11, PT6A-112, PT6A-135, PT6A-15AG, PT6A-20, PT6A-20A, PT6A-20B, PT6A-21, PT6A-25, PT6A-25A, PT6A-27, PT6A-28, PT6A-34, PT6A-34AG, PT6A-34B, PT6A-36, PT6A-41, PT6A-45A, PT6A-45B, PT6A-6, PT6A-6A, PT6A-6B, PT6A-6/C20, PT6A-20A, PT6A-27, PT6A-28, PT6A-34
Engine series: Pratt & Whitney Canada PT6A-11 5 aircraft
Pratt & Whitney Canada PT6A-112 20 aircraft
Pratt & Whitney Canada PT6A-135 29 aircraft
Pratt & Whitney Canada PT6A-15AG 40 aircraft
Pratt & Whitney Canada PT6A-20 23 aircraft
Pratt & Whitney Canada PT6A-20A 2 aircraft
Pratt & Whitney Canada PT6A-21 76 aircraft
Pratt & Whitney Canada PT6A-25 4 aircraft
Pratt & Whitney Canada PT6A-25A 5 aircraft
Pratt & Whitney Canada PT6A-27 31 aircraft
Pratt & Whitney Canada PT6A-28 13 aircraft
Pratt & Whitney Canada PT6A-34 232 aircraft
Pratt & Whitney Canada PT6A-34AG 271 aircraft
Pratt & Whitney Canada PT6A-36 4 aircraft
Pratt & Whitney Canada PT6A-41 84 aircraft
Pratt & Whitney Canada PT6A-6 1 aircraft
Pratt & Whitney Canada PT6A series 182 aircraft
Pratt & Whitney PT6A-20A 4 aircraft
Pratt & Whitney PT6A-28 25 aircraft
Pratt & Whitney PT6A series 2,219 aircraft

Dates and paperwork

In force since: April 18, 1980
Docket: Unknown
Status: Current
The FAA's document: Read the order on the FAA's site

The order itself the regulatory text, as published

Show the full text (2,195 characters)

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.

Source: FAA Dynamic Regulatory System, airworthiness directives. The FAA's document is the authority; the register counts are this site's, from the FAA register of October 5, 2026. Connections as data: /graph/directive/80-08-12.json · aircraft systems.