78-17-07: Fuel Control Unit
FAA order 78-17-07 is an airworthiness directive in force since August 31, 1978. The FAA's subject line: Fuel Control Unit. It names the Pratt & Whitney Canada PT6A-41, Pratt & Whitney Canada PT6A series engines: about 266 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.
- Models
- PT6A-38, PT6A-41, PT6A-45A
- Engine series
- Pratt & Whitney Canada PT6A-41 84 aircraft
Pratt & Whitney Canada PT6A series 182 aircraft
Dates and paperwork
- In force since
- August 31, 1978
- 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 (1,147 characters)
78-17-07 PRATT & WHITNEY AIRCRAFT OF CANADA, LIMITED: Amendment 39-3287. Applies to all Pratt & Whitney Aircraft of Canada, Limited PT6A-38, PT6A-41 and PT6A-45A engines and Pratt & Whitney Aircraft PT6A-38 engines with fuel control unit Aviation Electric Part Numbers 3244723-3 through -10, 3244738-5, 3244738-6, 3244752-6 through -10, and 3244755-7 through -11.
Compliance required within the next 100 hours in service, after the effective date of this AD, unless already accomplished.
To preclude rupture of the bypass valve diaphragm in the fuel control unit, replace the part number 2526477 diaphragm with part number 343451 diaphragm in accordance with Paragraph 2, Accomplishment Instructions, in Pratt & Whitney Aircraft of Canada, Limited Service Bulletin No. 3103 or approved equivalent parts and procedure.
Aircraft may be flown to a base for performance of maintenance required by this AD per FAR 21.197.
Any equivalent parts and procedure must be approved by the Chief, Engineering & Manufacturing Branch of the Eastern Region of the Federal Aviation Administration (FAA).
This amendment is effective August 31, 1978.
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/78-17-07.json · aircraft systems.