# AD 55-02-02: Gasket

- Type: Airworthiness directive
- Status: Current
- Products: Lycoming Engines O-320-A1A and O-320-A2A
- Superseded by: Nothing supersedes this AD
- Product type: Engine
- Registered aircraft: 27,355 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/23A2DF4B752AE3D7862568270070A26A.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/55-02-02

## The airworthiness directive

55-02-02 LYCOMING: Applies to Model O-320 Engines Below Serial Number 612 Installed in Aircraft Equipped With Fixed Pitch Propellers. Compliance required as soon as possible but not later than February 28, 1955. Several immediate forced landings have occurred with aircraft equipped with the above engine and propeller combinations due to rapid loss of engine oil from the engine accessory drive adapter gasket location. To preclude this possibility, all such engines should be inspected to insure that the proper gasket is installed under the lower accessory drive adapter cover. For engines with fixed pitch propellers, Lycoming P/N 69551, gasket must be installed at this location. (Lycoming Service Bulletin No. 176 covers this same subject.)

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS E-274](https://openairdocs.org/tcds/E-274): Lycoming Engines; names 2 of 60 models: O-320-A2A, O-320-A1A

## Registered aircraft it may apply to (OpenAirDocs)

Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment.

- Aircraft: 27,355 (0 by airframe model, 27,355 by engine model)
- Makers: Piper 11,637, Cessna 9,949, Grumman American Avn. 605, Bellanca 588, Beech 398, Champion 295, Robinson Helicopter 289, American Champion 250, American 116, Gulfstream American 95

Models with the most aircraft:

- [Lycoming 0-320 series](https://openairdocs.org/engine/lycoming-0-320-series): 27,057 aircraft (engine model)
- [Lycoming O-320 series](https://openairdocs.org/engine/lycoming-o-320-series): 256 aircraft (engine model)
- [Lycoming O-320-A1A](https://openairdocs.org/engine/lycoming-o-320-a1a): 21 aircraft (engine model)
- [Lycoming O-320-A series](https://openairdocs.org/engine/lycoming-o-320-a-series): 10 aircraft (engine model)
- [Lycoming 0-320-A2A](https://openairdocs.org/engine/lycoming-0-320-a2a): 9 aircraft (engine model)
- [Aerotec O-320 series](https://openairdocs.org/engine/aerotec-o-320-series): 2 aircraft (engine model)

All 6 models: https://openairdocs.org/ad/55-02-02/models.md
Every aircraft: https://openairdocs.org/ad/55-02-02/aircraft.md

Its text cites no advisory circulars or STCs.

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