1AD/CESSNA 400/81 Amdt 4 - Engine Mount Beams

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Cessna 400 Series Aeroplanes

AD/CESSNA 400/81

Amdt 4

Engine Mount Beams 5/98

Applicability: All models 402C aircraft with serial numbers 402C0001 through 402C0808, and all models 414A aircraft with serial numbers 414A0001 through 414A1206.

Requirement: 1. For aircraft with Cessna Kit SK414-17 incorporated, incorporate Cessna Kit SK414-19-1, and one of the following, as applicable, in accordance with the instructions to Service Kit SK414-19B, Revised 4 March 1986:

(a) Cessna Kit SK414-19-2: All of the affected Models 402C and 414A aircraft that are equipped with propeller unfeathering accumulators;

(b) Cessna Kit SK414-19-3: Model 402C aircraft, serial numbers 402C0001 through 402C0468; and Model 414A aircraft, serial numbers 414A0001 through 414A0646;

(c) Cessna Kit SK414-19-5: Model 402C aircraft, serial numbers 402C0469 through 402C0808; and Model 414A aircraft, serial numbers 414A0647 through 414A1206.

2. For aircraft without Cessna Kit SK414-17 incorporated, incorporate Cessna Kit SK414-19-1, and one of the following, as applicable, in accordance with the instructions to Service Kit SK414-19B, Revised 4 March 1986:

(a) Cessna Kit SK414-19-2: All of the affected Models 402C and 414A aircraft that are equipped with propeller unfeathering accumulators;

(b) Cessna Kit SK414-19-4: Model 402C, serial numbers 402C0001 through 402C0468; and Model 414A aircraft, serial numbers 414A0001 through 414A0646;

(c) Cessna Kit SK414-19-5: Model 402C aircraft, serial numbers 402C0469 through 402C0808; and Model 414A aircraft, serial numbers 414A0647 through 414A1206.

3. Inspect, using radiographic methods, the engine mount beam for cracks in accordance with the Accomplishment Instructions section of Attachment to Service Bulletin MEB85-3, Revised 23 August 1985, as referenced in Cessna Service Bulletin MEB85-3, Revision 2, dated 23 October 1987.

(a) If any crack is found in the left side (vertical portion) of the left engine beam of either nacelle, obtain a repair scheme from the manufacturer, and then incorporate this repair scheme.

(b) If cracks are found in the top (horizontal portion) of the engine beam and the total length of the cracks is less than 1.75 inches (44.5 mm), stop drill each end of each crack using a 0.098 inch drill bit.

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

(c) If cracks are found in the top (horizontal portion) of the engine beam and the total length of the cracks is equal to or greater than 1.75 inches, but less than

2.75 inches (70 mm), obtain a repair scheme from the manufacturer, and then incorporate this repair scheme.