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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Federal Register Abstract
Master Rod Assemblies
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_60-04-07.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 60-04-07 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: WRIGHT Model 977C9HD1, 2 and 3 Engines Subject: Master Rod Assemblies Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Curtiss-Wright/Marquette, Inc. Model: Cyclone 977C9HD1 | Cyclone 977C9HD2 | Cyclone 977C9HD3 Product Type: Engine Product Subtype: Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 60-04-07 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 60-04-07 SUBJECT HEADING: WRIGHT Model 977C9HD1, 2 and 3 Engines ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 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. FOOTER:
Document Text
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AD Final Rules - DRS_60-04-07.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 60-04-07 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: WRIGHT Model 977C9HD1, 2 and 3 Engines Subject: Master Rod Assemblies Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Curtiss-Wright/Marquette, Inc. Model: Cyclone 977C9HD1 | Cyclone 977C9HD2 | Cyclone 977C9HD3 Product Type: Engine Product Subtype: Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 60-04-07 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 60-04-07 SUBJECT HEADING: WRIGHT Model 977C9HD1, 2 and 3 Engines ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 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. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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