# AD 79-06-01: Engine Mounts with Cracked Straps

- Type: Airworthiness directive
- Status: Current
- Products: Revo Lake LA-4-200
- Effective: February 23, 1979
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Amendment: 39-3435
- Registered aircraft: 139 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/882570EAD560175586256A540046D403.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/79-06-01

## The airworthiness directive

79-06-01 CONSOLIDATED AERONAUTICS: Amendment 39-3435. Applies to Lake Model LA-4-200 airplanes, serial numbers 927, 931, 933 through 941 inclusive, 944 through 947 inclusive, 949 through 953 inclusive, 955, and 957. Compliance is required as indicated, unless already accomplished. To prevent operation of riveted aluminum engine mounts with cracked straps, accomplish the following:

1. Prior to further flight and thereafter prior to each flight until paragraph 2 is accomplished, visually inspect the left and right U-shaped straps, P/N 2-5400-245, that attach the lower engine mount fittings to the mount ring for cracks in accordance with Lake Aircraft, Division of Consolidated Aeronautics, Inc., Service Bulletin B61, dated February 23, 1979. Replace cracked aluminum straps, P/N 2-5400-245, with steel straps, P/N 2-5400-275, in accordance with the above-mentioned service bulletin prior to further flight.

2. Within the next 15 hours flight time, replace the aluminum straps, P/N 2-5400- 245, installed on riveted aluminum engine mounts, with steel straps, P/N 2-5400-275, in accordance with Lake Aircraft, Division of Consolidated Aeronautics, Inc., Service Bulletin B61, dated February 23, 1979.

3. The manufacturer's specifications and procedures identified and described in this directive are incorporated herein and made a part hereof pursuant to 5 U.S.C. 552(a)(1). All persons affected by this directive who have not already received these documents from the manufacturer may obtain copies upon request to Lake 4 Sales Corporation, P.O. Box 399, Tomball, Texas 77375.

This amendment is effective to all operators upon publication in the FEDERAL REGISTER, and was effective upon receipt for all recipients of the telegraphic airworthiness directive dated February 23, 1979.

## 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/79-06-01/models.md
Every aircraft: https://openairdocs.org/ad/79-06-01/aircraft.md

Its text cites no advisory circulars or STCs.

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