# AD 50-08-01: Tail Cone Mounting Longerons

- Type: Airworthiness directive
- Status: Current
- Products: Sikorsky S-51
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Rotorcraft
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/ECC63B6FC572BB4D86256A55006B670F.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/50-08-01

## The airworthiness directive

50-08-01 SIKORSKY: Applies to All Model S-51 Helicopters.

Compliance required at each 25-hour inspection.

Inspect the upper longerons, Drawing S-520879, of the S-10-20-3003 tail cone mounting assembly for cracks in the area adjacent to the generator support plate and clamps, and in all the welds on the longerons adjacent to the clamps. If cracks are found, the defective member should be reinforced or replaced prior to continuing flight.

(Sikorsky Service Information Circular No. 38, Revision A, dated January 4, 1950, covers this same subject.)

This supersedes AD 48-11-03.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS H-2](https://openairdocs.org/tcds/H-2): Sikorsky Aircraft Corporation; names 1 of 1 models: S-51

## Registered aircraft it may apply to (OpenAirDocs)

No registered aircraft matched the models it names.

Its text cites no advisory circulars or STCs.

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