AD 60-04-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Curtiss-Wright/Marquette, Inc. | Cyclone 977C9HD1 | WRIGHT Model 977C9HD1, 2 and 3 Engines |
| engine | Curtiss-Wright/Marquette, Inc. | Cyclone 977C9HD2 | WRIGHT Model 977C9HD1, 2 and 3 Engines |
| engine | Curtiss-Wright/Marquette, Inc. | Cyclone 977C9HD3 | WRIGHT Model 977C9HD1, 2 and 3 Engines |
Unsafe Condition
Failures of the master rod assemblies
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Required Actions
Install strengthened master and articulating rods with associated parts in accordance with Wright Aeronautical Division Service Bulletin No. C9-353.
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Compliance Time
At first engine overhaul after March 15, 1960, but not later than October 31, 1960.
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Affected Aircraft
Curtiss-Wright/Marquette, Inc. Cyclone 977C9HD1, 977C9HD2, and 977C9HD3 engine models installed in helicopters.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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