78-12-04: No. 2 Bearing Pressure Oil Transfer Tube Assembly
FAA order 78-12-04 is an airworthiness directive in force since June 19, 1978. The FAA's subject line: No. 2 Bearing Pressure Oil Transfer Tube Assembly. 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
- June 19, 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 (1,192 characters)
78-12-04 PRATT & WHITNEY AIRCRAFT: Amendment 39-3234. Applies to all Pratt & Whitney Aircraft of Canada, Limited PT6A-38 engines prior to Serial Number PCE-79179, PT6A-41 engines prior to Serial Number PCE-80718, PT6A-45A engines prior to Serial Number PCE-84108 and Pratt & Whitney Aircraft PT6A-38 engines prior to Serial Number P-79179 with Part Number 3019268 or 3027054 No. 2 bearing pressure oil transfer tube assemblies.
Compliance required within the next 50 hours in service, after the effective date of this AD, unless already accomplished.
To preclude oil leakage from the No. 2 bearing pressure oil transfer tube assembly replace the Part Number 3019268 and 3027054 tube assemblies with Part Number 3030150 tube assembly in accordance with Paragraph 2, accomplishment instructions in Pratt & Whitney Aircraft of Canada, Limited Service Bulletin No. 3099 or approved equivalent parts.
Aircraft may be flown to a base for performance of maintenance required by this ADper FAR 21.197 or FAR 21.199.
All equivalent parts must be approved by the Chief, Engineering and Manufacturing Branch of the Eastern Region of the FAA.
This amendment is effective June 19, 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/78-12-04.json · aircraft systems.