AD 75-22-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| 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
Secondary failure of the N2 accessory drive shaft due to binding of the torquemeter boost pump drive shaft.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove torquemeter boost pump with Part Number 1-300-221-01 or 1-300-221-02 and replace with Part Number 1-300-221-03 or 1-300-221-04.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within 200 hours time in service after the effective date of this AD
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Affected Aircraft
Avco Lycoming T53 series engines
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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