# AD 68-06-05: Failure of Coupling Shaft

- Type: Airworthiness directive
- Status: Current
- Products: FH1100 Manufacturing FH-1100
- Effective: March 23, 1968
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Rotorcraft
- Amendment: 39-565
- Registered aircraft: 8 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/CFD93E1955F7831786256A38005F9EF5.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/68-06-05

## The airworthiness directive

68-06-05 FAIRCHILD-HILLER: Amdt. 39-565. Applies to FH-1100 type helicopters serial numbers 10 thru 76 inclusive and 83.

Compliance required as indicated unless already accomplished.

To preclude the possibility of failure of the engine-to-transmission coupling shaft due to corrosion resulting from water contamination, accomplish the following:

  (a) Within the next 100 helicopter hours' time in service following the effective date of this AD, remove Bendix coupling shaft P/N 19E49-3A and inspect for any corrosion and if found, replace with P/N 19E49-3B or if corrosion is absent modify in accordance with accomplishment instructions contained in Fairchild Hiller Service Bulletin No. FH-1100-24-1 dated January 25, 1968, or later FAA approved revision, or an equivalent inspection procedure or modification approved by the Chief, Engineering and Manufacturing Branch, FAA Eastern Region.

  (b) Upon request, with substantiating data submitted through an FAA maintenance inspector, the compliance time may be increased by the Chief, Engineering and Manufacturing Branch, FAA Eastern Region.

This amendment is effective March 23, 1968.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS H2WE](https://openairdocs.org/tcds/H2WE): Air Space Design and Manufacturing LLC; names 1 of 2 models: FH-1100

## 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: 8 (8 by airframe model, 0 by engine model)
- Makers: Fairchild Hiller 8

Models with the most aircraft:

- [Fairchild Hiller FH-1100](https://openairdocs.org/model/fairchild-hiller-fh-1100): 8 aircraft (airframe model)

All 1 models: https://openairdocs.org/ad/68-06-05/models.md
Every aircraft: https://openairdocs.org/ad/68-06-05/aircraft.md

Its text cites no advisory circulars or STCs.

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