# AD 85-15-05: Main Rotor Horn Eyebolt/Eyebolt Assembly

- Type: Airworthiness directive
- Status: Current
- Products: Sikorsky S-61L, S-61N and S-61NM
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Rotorcraft
- Registered aircraft: 47 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/BD39CAC3299638BC86256A4E0053A499.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/85-15-05

## The airworthiness directive

85-15-05 SIKORSKY AIRCRAFT: Letter issued July 23, 1985. Applies to Model S- 61L, N, and NM series helicopters, certificated in any category, that are equipped with main rotor horn eyebolt, P/N S6112-23072-101, or eyebolt assembly, P/N S6112-23072-041.

Compliance is required as indicated.

For helicopters with main rotor horn eyebolt or eyebolt assembly with more than 6,800 hours time in service upon receipt of this AD, compliance is required prior to further flight, unless already accomplished, and thereafter at intervals not to exceed 6,800 hours time in service.

For helicopters with main rotor horn eyebolt or eyebolt assembly with 6,800 or less hours time in service upon receipt of this AD, compliance is required prior to the accumulation of 6,800 hours time in service, unless already accomplished, and thereafter at intervals not to exceed 6,800 hours time in service.

To prevent possible failure of the main rotor horn eyebolt or eyebolt assembly, accomplishthe following:

      (A) Remove and replace the main rotor horn eyebolt or eyebolt assembly with a new or airworthy part of the same part number that has less than 6,800 hours time in service, in accordance with Sikorsky S-61L Maintenance Manual 4045-101, Section 65-12-10, dated March 15, 1973, or S-61N Maintenance Manual 4045-80, Section 65-12-10, dated November 15, 1972.

      (B) Special flight permits not to exceed 6 flight hours may be issued in accordance with FAR Sections 21.197 and 21.199 to operate helicopters to a base for replacement of the main rotor horn eyebolt or eyebolt assembly as required by this AD.

      (C) Alternate repairs, modifications, or other means of compliance with the AD which provide an equivalent level of safety must be approved by the Manager, Boston Aircraft Certification Office, FAA, New England Region, 12 New England Executive Park,Burlington, Massachusetts 01803.

This airworthiness directive becomes effective upon receipt.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS 1H15](https://openairdocs.org/tcds/1H15): Sikorsky Aircraft; names 3 of 4 models: S-61N, S-61L, S-61NM

## 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: 47 (47 by airframe model, 0 by engine model)
- Makers: Sikorsky 47

Models with the most aircraft:

- [Sikorsky S-61N](https://openairdocs.org/model/sikorsky-s-61n): 45 aircraft (airframe model)
- [Sikorsky S-61L](https://openairdocs.org/model/sikorsky-s-61l): 1 aircraft (airframe model)
- [Sikorsky S-61NM](https://openairdocs.org/model/sikorsky-s-61nm): 1 aircraft (airframe model)

All 3 models: https://openairdocs.org/ad/85-15-05/models.md
Every aircraft: https://openairdocs.org/ad/85-15-05/aircraft.md

Its text cites no advisory circulars or STCs.

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