AD 78-14-05

78-14-05 CONSOLIDATED AERONAUTICS: Amendment 39-3260. Applies to Lake Model LA-4-200 airplanes, Serial Nos. 769 through 830, inclusive.

Compliance is required as indicated, unless already accomplished. To prevent operation with flawed (material defect) wing main beam attachment fittings, accomplish the following:

1. Prior to further flight and thereafter prior to the first flight of each day until paragraph 3 is accomplished, visually inspect the outboard portion of the four (4) wing main beam attachment fittings (steel fittings), P/N 1-3214-3, for flaws which appear as spanwise cracks.

2. Flawed fittings found as a result of the inspections of paragraphs 1 above or 3a below, must be replaced prior to further flight with serviceable fittings, P/N 1-3214-3, in accordance with paragraph 4.

3. Within the next 15 hours time in service after the effective date of this AD, visually inspect the outboard end of the four steel wing main beam attachment fittings, P/N 1- 3214-3,for the impression stamped bar stock heat treat lot number. These fittings are visible through the main gear wheel wells. If the fitting impression stamped lot number is 741 or 741R, either:

a. Ultrasonic inspect the steel wing main beam attachment fitting(s), P/N 1- 3214-3, for flaws in accordance with Lake Aircraft Division of Consolidated Aeronautics, Inc., Service Bulletin B60, or

b. Replace the steel wing main beam attachment fitting(s), P/N 1-3214-3, with serviceable fitting(s), P/N 1-3214-3, in accordance with paragraph 4.

NOTE: This paragraph applies whether or not an "H" is impression stamped on the outboard end of the fitting opposite "741" or "741R".

4. Replacement serviceable fittings must be installed in accordance with Lake Aircraft Division of Consolidated Aeronautics, Inc., Service Bulletin B60.

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. These documents may also be examined at FAA, New England Region, 12 New England Executive Park, Burlington, Massachusetts, and at FAA Headquarters, 800 Independence Avenue, S.W., Washington, D.C. A historical file on this AD which includes the incorporated material in full is maintained by the FAA at its Headquarters in Washington, D.C., and at FAA New England Region Headquarters, Burlington, Massachusetts.

This amendment becomes effective July 19, 1978.