# AD 47-32-15: Control System Chain and Sprockets

- 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- Superseded by: Nothing supersedes this AD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/DF6CDCDB3C980C7886256A55006B0DC5.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/47-32-15

## The airworthiness directive

47-32-15 SIKORSKY: (Was Mandatory Note 1 of AD-2H-1.) Applies to Model S-51 Helicopters.

Compliance required prior to next flight.

Inspect the chain and sprockets of the control system for an accumulation of excessive grease and foreign matter. Excessive grease and any foreign matter adhering to the chain and sprockets should be removed prior to the next flight in order to prevent possible malfunctioning of the flight control system. The recommended procedure as contained in the Sikorsky Service Information Circular No. 17 dated June 2, 1947, should be followed at the first disassembly of these parts.

## 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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