# AD 86-19-14: Tail Rotor Assembly

- Type: Airworthiness directive
- Status: Current
- Products: Sikorsky S-76A and S-76B
- Effective: January 30, 1987
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Rotorcraft
- Amendment: 39-5505
- Registered aircraft: 53 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/C9AD5163F321BC2D86256A4D007428EB.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/86-19-14

## The airworthiness directive

86-19-14 SIKORSKY AIRCRAFT: Amendment 39-5505. Applies to all Model S-76A and S-76B helicopters, certificated in any category, equipped with tail rotor blade assemblies as follows:

MODEL PART NUMBERS SERIAL NUMBERS S-76A 76101-05001 or A1 37-00766, -00774, -00775,

76101-05101 -00779,-00781, -00783, and -00785 S-76B 76101-05501 A245-00025, -00026, -00027, -00028, -00037, -00040, -00041, and -00047

Compliance is required as indicated, unless already accomplished.

To prevent possible operation with an improperly manufactured tail rotor assembly, accomplish the following:

  (a) Prior to further flight after receipt of this AD, remove the above listed serial numbered tail rotor assemblies/spars, and replace with a serviceable part. The above listed serial numbered tail rotor assemblies/spars marked with the suffix (X) are serviceable parts.

  (b) Aircraft may be ferried in accordance with the provisions of FAR Sections 21.197 and 21.199 to a base where the requirements of this AD may be accomplished.

  (c) Upon request, an alternate means of compliance which provides an equivalent level of safety with the requirements of this AD may be approved by the Manager, Boston Aircraft Certification Office, New England Region, Federal Aviation Administration, 12 New England Executive Park, Burlington, Massachusetts 01803, telephone (617) 273-7118.

  (d) Upon submission of substantiating data by an owner or operator, through an FAA maintenance inspector, the Manager, Boston Aircraft Certification Office, New England Region, Federal Aviation Administration, 12 New England Executive Park, Burlington, Massachusetts 01803, telephone (617) 273-7118, may adjust the compliance time specified in this AD.

This amendment becomes effective January 30, 1987, as to all persons except those persons to whom it was made immediately effective by individual priority letter AD No. 86-19-l4 issued September 23, 1986, which contained this amendment.

## 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 2 of 4 models: S-76B, 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: 53 (53 by airframe model, 0 by engine model)
- Makers: Sikorsky 53

Models with the most aircraft:

- [Sikorsky S-76B](https://openairdocs.org/model/sikorsky-s-76b): 34 aircraft (airframe model)
- [Sikorsky S-76A](https://openairdocs.org/model/sikorsky-s-76a): 19 aircraft (airframe model)

All 2 models: https://openairdocs.org/ad/86-19-14/models.md
Every aircraft: https://openairdocs.org/ad/86-19-14/aircraft.md

Its text cites no advisory circulars or STCs.

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