# AD 60-03-10: Oil Control Valve

- Type: Airworthiness directive
- Status: Current
- Products: Curtiss-Wright/Marquette Double Row Turbo Cyclone 972TC18DA1 (R-3350-34, -91), Double Row Turbo Cyclone 972TC18DA2, Double Row Turbo Cyclone 972TC18DA3, Double Row Turbo Cyclone 972TC18DA4, Double Row Turbo Cyclone 981TC18EA1, Double Row Turbo Cyclone 988TC18EA1, Double Row Turbo Cyclone 988TC18EA2, Double Row Turbo Cyclone 988TC18EA3, Double Row Turbo Cyclone 988TC18EA4, Double Row Turbo Cyclone 988TC18EA5 and Double Row Turbo Cyclone 988TC18EA6
- Superseded by: Nothing supersedes this AD
- Product type: Engine
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/5F248B3DE312CAC8862569AE006FD78B.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/60-03-10

## The airworthiness directive

60-03-10 WRIGHT: Amdt. 90 Part 507 Federal Register January 26, 1960. Applies to All TC18DA and TC18EA Series Engines.

Compliance required at first engine overhaul after February 1, 1960, but not later than October 1, 1960.

To prevent inadvertent loss of oil from the power recovery turbine fluid couplings, the PRT oil control valve must incorporate a WAD P/N 147825 valve body, or subsequently released part. This valve body incorporates three flats to provide a permanent oil bypass to insure an adequate supply of turbine coupling oil in the event of a regulator spring failure. (WAD Service Bulletins Nos. TC18-390 and TC18E-210 cover this same subject and furnish instructions for the rework of the superseded valve bodies to the P/N 147825 configuration.)

This supersedes and cancels item No. (8) of AD 58-13-05.

## Affected data sheets (2) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS E-287](https://openairdocs.org/tcds/E-287): Curtiss-Wright/Marquette Inc.; names 7 of 7 models: Double Row Turbo Cyclone 988TC18EA3, Double Row Turbo Cyclone 988TC18EA1, Double Row Turbo Cyclone 988TC18EA5, Double Row Turbo Cyclone 988TC18EA6, Double Row Turbo Cyclone 988TC18EA2, Double Row Turbo Cyclone 988TC18EA4, Double Row Turbo Cyclone 981TC18EA1
- [TCDS E-272](https://openairdocs.org/tcds/E-272): Curtiss-Wright/Marquette Inc.; names 4 of 4 models: Double Row Turbo Cyclone 972TC18DA4, Double Row Turbo Cyclone 972TC18DA3, Double Row Turbo Cyclone 972TC18DA1 (R-3350-34; -91), Double Row Turbo Cyclone 972TC18DA2

## 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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