# AD 84-10-02: Main Rotor Blade Spar

- Type: Airworthiness directive
- Status: Current
- Products: Sikorsky S-76A
- Effective: June 18, 1984
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Rotorcraft
- Amendment: 39-4802
- Registered aircraft: 19 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/1BAAEF023C50E21B86256A4E0044E4F9.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/84-10-02

## The airworthiness directive

84-10-02 SIKORSKY AIRCRAFT: Amendment 39-4802. Applies to Model S-76A series helicopters certificated in all categories.

To prevent operation with a cracked main rotor spar, accomplish the following:

Applies to main rotor blades, Part Number (P/N) 76150-09000 or 76150-09100, with more than 600 hours time in service. Compliance required within the next 25 hours time in service after the effective date of this AD, unless previously accomplished and thereafter at intervals not to exceed 500 hours time in service.

  (a) Inspect the main rotor blade spar for cracks in accordance with the Sikorsky S-76 Composite Materials Manual, SA-4047-76-5, paragraph 2-7 or 2-7A.

  (b) If a spar crack is found, replace the main rotor blade with a new or serviceable component before further flight.

  (c) Paragraphs 2-7 and 2-7A of the Sikorsky S-76 Composite Materials Manual, that are specified in paragraph (a) of this AD, are incorporated herein and made a part hereof pursuantto 5 U.S.C. 552(a)(1). 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, North Main Street, Stratford, Connecticut 06602. These documents may also be examined at the FAA, New England Region, 12 New England Executive Park, Burlington, Massachusetts 01803, and at the Office of the Regional Counsel, FAA, Southwest Region, Fort Worth, Texas.

  (d) Upon request from the operator, an FAA maintenance inspector may adjust the repetitive inspection interval in this AD if the request contains data to justify the increase and provided the Manager, Boston Aircraft Certification Office, FAA, New England Region, approves the increase.

This amendment supersedes Amendment 39-4019 (46 FR 3498), AD 80-23-51, that was effective January 15, 1981, for all persons except those to whom it was made effective by telegram dated November 7, 1980.This amendment becomes effective June 18, 1984.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS H1NE](https://openairdocs.org/tcds/H1NE): Sikorsky Aircraft Corporation; names 1 of 4 models: S-76A

## Registered aircraft it may apply to (OpenAirDocs)

Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment.

- Aircraft: 19 (19 by airframe model, 0 by engine model)
- Makers: Sikorsky 19

Models with the most aircraft:

- [Sikorsky S-76A](https://openairdocs.org/model/sikorsky-s-76a): 19 aircraft (airframe model)

All 1 models: https://openairdocs.org/ad/84-10-02/models.md
Every aircraft: https://openairdocs.org/ad/84-10-02/aircraft.md

Its text cites no advisory circulars or STCs.

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