# AD 72-03-01: Alum. Forgings Flight Control System

- Type: Airworthiness directive
- Status: Current
- Products: Sikorsky S-61A, S-61D, S-61E, S-61L, S-61N, S-61NM, S-61R and S-61V
- Effective: February 1, 1972
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Rotorcraft
- Amendment: 39-1382
- Registered aircraft: 54 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/F396C7242D1E9FAB86256A5500703CB8.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/72-03-01

## The airworthiness directive

72-03-01 SIKORSKY AIRCRAFT: Amdt. 39-1382. Applies to S-61 Type Helicopters Certificated in all Categories. To prevent failures of flight control system components accomplish the following:

  (a) Within the next 30 days after the effective date of this AD, unless already accomplished, and thereafter at intervals not to exceed 30 days from the last inspection, perform inspections of 7075-T6 and 7079-T6 aluminum alloy forgings of the flight control systems in accordance with Section 2 Accomplishment Instructions, Part IA (1) of Sikorsky Service Bulletin No. 61B40-5A or later FAA-approved revisions, or an alternate method approved by the Chief, Engineering and Manufacturing Branch, FAA Eastern Region. If a crack is found, remove the component from service prior to further flight.

  (b) Within the next 75 days after the effective date of this AD, unless already accomplished, perform an inspection of control system components P/N S6140-62118, S6140-62115 and S6140-20004 in accordance with Section 2, Accomplishment Instructions, Part IIB of Sikorsky Service Bulletin No. 61B40-5A or later FAA-approved revisions or an alternate method approved by the Chief, Engineering and Manufacturing Branch, FAA Eastern Region. If a crack is found, remove the component from service prior to further flight.

This amendment is effective February 1, 1972.

## Affected data sheets (2) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS 1H15](https://openairdocs.org/tcds/1H15): Sikorsky Aircraft; names 4 of 4 models: S-61R, S-61N, S-61L, S-61NM
- [TCDS H2EA](https://openairdocs.org/tcds/H2EA): Sikorsky Aircraft Corporation; names 4 of 4 models: S-61A, S-61D, S-61V, S-61E

## 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: 54 (54 by airframe model, 0 by engine model)
- Makers: Sikorsky 53, Carson Helicopters / Sikorsky 1

Models with the most aircraft:

- [Sikorsky S-61N](https://openairdocs.org/model/sikorsky-s-61n): 45 aircraft (airframe model)
- [Sikorsky S-61A](https://openairdocs.org/model/sikorsky-s-61a): 5 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)
- [Sikorsky S-61R](https://openairdocs.org/model/sikorsky-s-61r): 1 aircraft (airframe model)
- [Carson Helicopters / Sikorsky S61A](https://openairdocs.org/model/carson-helicopters-sikorsky-s61a): 1 aircraft (airframe model)

All 6 models: https://openairdocs.org/ad/72-03-01/models.md
Every aircraft: https://openairdocs.org/ad/72-03-01/aircraft.md

Its text cites no advisory circulars or STCs.

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