# AD 58-18-01: Governor

- 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, Double Row Turbo Cyclone 988TC18EA6 and Governors
- Superseded by: Nothing supersedes this AD
- Product type: Appliance
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/CF01C5C6C8BCE7AE862569700063489A.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/58-18-01

## The airworthiness directive

58-18-01 HAMILTON STANDARD: Applies to All Hamilton Standard Propellers Controlled by 5U18 Governors and Installed on TC18DA and TC18EA Series Engines.

Compliance required at first governor overhaul after December 1, 1958, but not later than June 1, 1959.

Adverse environmental conditions in the propeller governor resulting from certain types of engine failure have caused improper operation of the governor in such a manner as to result in propeller overspeeding, failure to feather and reversing when feathering was initiated. In order to minimize the possibility of such occurrences, provide a means for feathering that will be independent of the low pressure relief and pilot valves incorporated in the 5U18 governors. Installation of the Deterjet Model DJ-1025 governor bypass valve or replacement of the 5U18 governor by the Hamilton Standard 5AA22 governor are considered acceptable means to accomplish the desired objective. (installation of Deterjet Model DJ-1025 on Douglas DC-7C approved under Supplemental Type Certificate SA4-507.)

(Deterjet Service Bulletin No.1 and Hamilton Standard Bulletin No. 561 cover this same subject.)

## 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.

## Related documents

- [STC SA4-507](https://openairdocs.org/stc/SA4-507): Deterjet DJ1025 valve in place of Wright torquemeter booster pump upper housing per STC SEW-10.. Pan American World Airways Inc., Cited in the text

## NTSB investigations that cite this AD (1)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB CHI98LA125](https://openairdocs.org/ntsb/CHI98LA125), Apr 13, 1998: Beech B35 (N5246C), Bentonville, AR, substantial damage. Probable cause: the damage to the empennage was due to flutter.

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