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.