# AD 76-24-02: Engine Oil Coolers

- Type: Airworthiness directive
- Status: Current
- Products: Revo Lake LA-4-200
- Effective: October 15, 1976
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Amendment: 39-2774
- Registered aircraft: 139 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/EAA2AC4E7D841A1586256A540046C67A.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/76-24-02

## The airworthiness directive

76-24-02 LAKE AIRCRAFT, DIVISION OF CONSOLIDATED AERONAUTICS, INC: Amendment 39-2774. Applies to all Lake Model LA-4-200 airplanes certified in all categories equipped with Stewart Warner Model 8406J engine oil coolers.

Compliance required as indicated unless already accomplished.

To preclude possible oil cooler failures allowing rapid loss of engine oil which could result in engine stoppage, accomplish the following:

A. Before next flight of the affected airplanes, inspect the engine oil cooler (fluid fitting side) to determine whether it is a Model 8406J S/N 101 through 1500.

1. If the oil cooler is a Model 8406J S/N 101 through 1500, prior to further flight, replace this cooler with an FAA approved oil cooler not of the above model and serial number.

2. If the oil cooler is not of the model and serial number listed above, make an entry in the aircraft maintenance records indicating that this airworthiness directive has been accomplished and the airplane may be returned to service.

B. The inspection and maintenance record entry required by paragraph A2 may be accomplished by holder of a pilot's certificate issued under Part 61 of the Federal Aviation Regulations on any aircraft owned or operated by him.

C. Equivalent methods of compliance with this AD may be approved by the Chief, Engineering and Manufacturing Branch, FAA, New England Region.

NOTE: A ferry permit to accomplish a needed oil cooler replacement may be issued under the provisions of FAR 21.197 by FAA District Offices, with appropriate limitations.

This amendment becomes effective immediately upon publication in the Federal Register for all persons except those to whom it was made effective immediately upon receipt of airmail letter dated October 15, 1976.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS 1A13](https://openairdocs.org/tcds/1A13): Revo Incorporated; names 1 of 7 models: Lake LA-4-200

## 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: 139 (139 by airframe model, 0 by engine model)
- Makers: Consolidated Aeronautics 139

Models with the most aircraft:

- [Consolidated Aeronautics LAKE LA-4-200](https://openairdocs.org/model/consolidated-aeronautics-lake-la-4-200): 139 aircraft (airframe model)

All 1 models: https://openairdocs.org/ad/76-24-02/models.md
Every aircraft: https://openairdocs.org/ad/76-24-02/aircraft.md

Its text cites no advisory circulars or STCs.

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