78-23-08: Fuel Pump To Fuel Injector Tube Elbow
FAA order 78-23-08 is an airworthiness directive in force since November 7, 1978. The FAA's subject line: Fuel Pump To Fuel Injector Tube Elbow. It names the Lycoming IO-540-G1B5, Lycoming IO-540-K1F5, Lycoming IO-540-P1A5, Lycoming IO-540-S1A5 engines: about 19 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
- Lycoming Engines
- Models
- IO-540-G1B5, IO-540-K1F5, IO-540-P1A5, IO-540-S1A5
- Engine series
- Lycoming IO-540-G1B5 3 aircraft
Lycoming IO-540-K1F5 2 aircraft
Lycoming IO-540-P1A5 4 aircraft
Lycoming IO-540-S1A5 10 aircraft
Dates and paperwork
- In force since
- November 7, 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 (1,071 characters)
78-23-08 AVCO LYCOMING: Amendment 39-3334. Applies to all IO-540-G1B5, -K1F5, -P1A5 and - S1A5 series engines with serial numbers up to and including L-17835-48 or -45A and all IO-540-G1B5, -K1F5, - P1A5, -S1A5 series engines overhauled (also known as remanufactured) by Lycoming prior to March 30, 1978.
Compliance required within the next 50 hours' in service after the effective date of this AD, unless already accomplished.
To prevent possible fuel leakage due to failure of the fuel pump to fuel injector tube elbow replace the fuel pump to fuel injector tube part number LW-10445 and the fuel pump to fuel injector tube elbow, part number LW-10446 with flexible hose assembly, part number LW-12877-6-051.
Upon submission of substantiating data through an FAA Maintenance Inspector, the Chief, Engineering and Manufacturing Branch, Federal Aviation Administration (FAA), Eastern Region, may adjust the compliance time specified in this AD.
(NOTE: AVCO Lycoming Service Bulletin No. 421 covers this subject.)
This amendment is effective November 7, 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 30, 2026. Connections as data: /graph/directive/78-23-08.json · aircraft systems.