54-02-01: Magneto Timing
FAA order 54-02-01 is an airworthiness directive. The FAA's subject line: Magneto Timing. It names the Lycoming O-290-D2 engine: about 58 aircraft on the U.S. register today, 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
- Textron Lycoming, AVCO Corporation
- Models
- O-290-D2
- Engine series
- Lycoming O-290-D2 58 aircraft
Dates and paperwork
- 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 (661 characters)
54-02-01 LYCOMING: Applies to All Model O-290-D2 Engines.
Compliance required by February 1, 1954, and at each subsequent 100-hour inspection.
In order to preclude the possibility of serious engine damage from incipient detonation under certain atmospheric and altitude conditions, the magneto timing of all Lycoming O-290-D2 engines must be set at 18 degrees BTC. To insure that the magneto timing does not change substantially from this setting, it should be checked and reset, if necessary, at each subsequent 100-hour inspection.
(Lycoming Service Bulletin No. 169 covers this same subject, but recommends that the timing be checked every 50 hours.)
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 November 6, 2026. Connections as data: /graph/directive/54-02-01.json · aircraft systems.