# AD 60-04-07: Master Rod Assemblies

- Type: Airworthiness directive
- Status: Current
- Products: Curtiss-Wright/Marquette Cyclone 977C9HD1, Cyclone 977C9HD2 and Cyclone 977C9HD3
- Superseded by: Nothing supersedes this AD
- Product type: Engine
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/5CB51F309A3A76F2862569AE006FD1CB.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/60-04-07

## The airworthiness directive

60-04-07 WRIGHT: Amdt. 106 Part 507 Federal Register February 20, 1960. Applies to All 977C9HD1, 2 and 3 Engine Models Installed in Helicopters.

Compliance required at first engine overhaul after March 15, 1960, but not later than October 31, 1960.

To alleviate failures of the master rod assemblies, strengthened master and articulating rods with associated parts must be installed in accordance with the instructions contained in Wright Aeronautical Division Service Bulletin No. C9-353.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS E-243](https://openairdocs.org/tcds/E-243): Curtiss-Wright/Marquette Inc.; names 3 of 14 models: Cyclone 977C9HD2, Cyclone 977C9HD1, Cyclone 977C9HD3

## 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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