AD 81-09-07

81-09-07 SIKORSKY AIRCRAFT: Amendment 39-4099. Applies to S-76A series helicopters certificated in all categories with P/N 76150-09000 series and P/N 76150-09100-041, -042, -043, main rotor blades. For main rotor blades with 340 or more hours time in service, compliance required within the next 25 hours time in service after the effective date of this AD, unless already accomplished.

For main rotor blades with less than 340 hours time in service on the effective date of this AD, compliance required before the accumulation of 365 hours time in service.

To prevent operation with cracked bolts in the main rotor blade tip plate attachment joint, accomplish the following:

1. In accordance with Sikorsky Alert Service Bulletin No. 76-65-23, dated April 16, 1981, replace the four NAS624H6 bolts which mate the 76150-09030 tip plate assembly with the 76150-09000 or 76150-09100 main rotor blade, per paragraphs D(1) through D(8), and subsequently inspect for torque per paragraph D(9), or an equivalent procedure approved by the Chief, Engineering and Manufacturing Branch, Federal Aviation Administration, New England Region.

2. Report within 24 hours any discrepancies found during the rework and inspections required herein, including main rotor blade time in service, to the Chief, Engineering and Manufacturing Branch, Federal Aviation Administration, New England Region, 12 New England Executive Park, Burlington, Massachusetts 01803.

Reporting approved by the Office of Management and Budget under OMB No. 04-401 74.

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) (l). All persons affected by this directive, who have not already received these documents from the manufacturer, may obtain copies upon request to Sikorsky Aircraft, Division of United Technologies Corporation, Stratford, Connecticut 06602. These documents may also beexamined at FAA, New England Region, 12 New England Executive Park, Burlington, Massachusetts 01803, and at FAA Headquarters, 800 Independence Avenue, S.W., Washington, D.C.

This AD supersedes AD 80-14-05.

This amendment becomes effective May 7, 1981.