AD 86-09-11

86-09-11 SIKORSKY AIRCRAFT: Amendment 39-5298. Applies to Model S-76A helicopters certificated in any category.

Compliance is required as indicated unless already accomplished.

To preclude possible fatigue failures of the main and nose landing gear components, accomplish the following:

(a) Within the next 100 hours time in service after the effective date of this AD or before the accumulation of the component hours time in service listed below, whichever occurs later, replace the following components with new or airworthy components that have not exceeded the component listed hours time in service. Thereafter, replace the following components with new or airworthy components before the accumulation of the components hours time in service listed below:

COMPONENT

PART NUMBER REPLACEMENT TIME/HOURS Nose Landing Gear

Fork 1944E60 42,500 Cylinder 1944E2, 1944C2 18,500 Retraction Actuator

Cylinder Terminal 1944D201 28,800 Piston Rod 1944E204 25,000 Main Landing Gear

Cylinder 1945E2 30,300 Axle Support Fitting 1945C12 9,600 Pin, Universal to Cylinder 1945C29 23,800 Drag Brace Rod End 1945E35 38,200 Upper Torque Arm 1945E46 37,900 Lower Torque Arm 1945C47 16,200 Axle 1945E85 7,200 Rod End, Positioning Rod 1945E235 19,100 Retraction Actuator

Outer Cylinder 1945E302 7,100 Piston 1945E314 33,300 Piston Rod End 01-747-061 8,000

(b) Operators who have not kept records of hours time in service on individual component parts that were installed at time of issuance of the initial rotorcraft airworthiness certificate shall substitute rotorcraft hours time in service in lieu thereof.

(c) For purposes of complying with this AD, the hours time in service for individual components that were not installed at the time of issuance of the initial rotorcraft airworthiness certificate must be determined from operator's rotorcraft records.

(d) Upon request, an alternate means ofcompliance which provides a level of say equivalent to the requirements of this AD may be used when approved by the Manager, Boston Aircraft Certification Office, 12 New England Executive Park, Burlington, Massachusetts 01803, telephone (617) 273-7118.

(e) Upon submission of substantiating data by an owner or operator through an FAA maintenance inspector, the Manager, Boston Aircraft Certification Office, 12 New England Executive Park, Burlington, Massachusetts 01803, telephone 1617) 237-7118, may adjust the compliance time specified in this AD.

NOTE: Sikorsky Alert Service Bulletin 76-32-20 applies to this subject.

This amendment becomes effective on May 14, 1986.