AD 77-17-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Honeywell International Inc. | T53-L-703 | AVCO LYCOMING Model T53 Series Engines |
| engine | Honeywell International Inc. | T5307A | AVCO LYCOMING Model T53 Series Engines |
| engine | Honeywell International Inc. | T5309A | AVCO LYCOMING Model T53 Series Engines |
| engine | Honeywell International Inc. | T5309B | AVCO LYCOMING Model T53 Series Engines |
| engine | Honeywell International Inc. | T5309C | AVCO LYCOMING Model T53 Series Engines |
| engine | Honeywell International Inc. | T5311A | AVCO LYCOMING Model T53 Series Engines |
| engine | Honeywell International Inc. | T5311B | AVCO LYCOMING Model T53 Series Engines |
| engine | Honeywell International Inc. | T5313A | AVCO LYCOMING Model T53 Series Engines |
| engine | Honeywell International Inc. | T5313B | AVCO LYCOMING Model T53 Series Engines |
| engine | Honeywell International Inc. | T5317A | AVCO LYCOMING Model T53 Series Engines |
Unsafe Condition
Failure of the fuel regulator P1 multiplier lever resulting in flameout of the engine.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Fill the fuel regulator P1 multiplier cavity with silicone oil (General Electric P/N SF96-100 or equivalent) and reidentify the fuel regulator to specified part numbers as per Avco Lycoming Service Bulletin No. 0048, Revision 1, or later approved revision.
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Compliance Time
Compliance for P/Ns 1-170-240-52, 1-170-240-58, and 1-170-240-59 is required by September 15, 1977. Compliance for remaining part numbers is required by May 1, 1978.
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Affected Aircraft
Avco Lycoming T53 series engines with specified part numbers listed in the AD, including P/Ns 1-160-840-01 to 1-160-840-15, 1-160-950-02 to 1-160-950-19, and 1-170-240-01 to 1-170-240-84, among others.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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