AD 76-12-11

76-12-11 LAKE AIRCRAFT, DIVISION of CONSOLIDATED AERONAUTICS, INC: Amendment 39-2646. Applies to all Model LA-4-200 airplanes equipped with the AC GF- 416 fuel filter.

Compliance required as specified below unless already accomplished.

1. To prevent engine power loss resulting from fuel injector contamination caused by filter housing corrosion, remove the AC GF-416 fuel filter from aircraft, cut open the housing and inspect the inside for corrosion in accordance with the following schedule:

a. Inspect the AC GF-416 filters installed in aircraft 60 or more days, within the next 30 days.

b. Inspect AC GF-416 filters installed in aircraft less than 60 days, prior to the accumulation of 90 days on aircraft.

Thereafter,

c. Inspect AC GF-416 replacement filters prior to the accumulation of 90 days on aircraft.

If corrosion is observed, inspect the Bendix Fuel Injection Unit in accordance with Paragraphs 2 a, b, and c, prior to further flight.

2. If the aircraft has had at least one fuel filter changed since the installation of a new or overhauled fuel injection unit before the effective date of this AD, perform the following inspection of the Model RSA-5AD1 Bendix Fuel Injection Unit, P/N 252054-4, within the next 30 calendar days:

a. Remove and inspect fuel inlet strainer.

b. Inspect housing area enclosing strainer.

c. Remove and inspect each of the four injector nozzles P/N 2524107, including the shield P/N 2520418 and screen P/N 367687.

If corrosion contamination is found in the fuel injector nozzle assembly, strainer or housing area, replace or overhaul the fuel injection unit and the flow divider P/N 2524057-2 prior to further flight.

Reference: Lake Aircraft Division Service Bulletin B-57.

Equivalent methods of compliance may be approved by the Chief, Engineering and Manufacturing Branch, Federal Aviation Administration, New England Region, 12 New England Executive Park, Burlington, Massachusetts 01803.This amendment becomes effective June 29, 1976.