AD 60-11-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sensenich Propeller Manufacturing Company, Inc. | 74DM6 | SENSENICH M74DM Propellers |
| aircraft | Sensenich Propeller Manufacturing Company, Inc. | 74DM7 | SENSENICH M74DM Propellers |
| propeller | Sensenich Propeller Manufacturing Company, Inc. | 74DM6 | SENSENICH M74DM Propellers |
| propeller | Sensenich Propeller Manufacturing Company, Inc. | 74DM7 | SENSENICH M74DM Propellers |
Unsafe Condition
Cracked hubs originating in the pilot bore due to three incidents.
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Required Actions
Visually inspect for cracks in the pilot bore; polish out scratches and break/polish sharp edges at the front and rear chamfer if no cracks found; torque retaining bolts to 300 inch-pounds upon reinstallation.
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Compliance Time
Within the next 100 hours of flight time or by August 1, 1960, whichever comes first, and at each periodic inspection thereafter.
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Affected Aircraft
Sensenich Propeller Manufacturing Company, Inc. models 74DM6 and 74DM7 propellers installed on Lycoming O-320-B series engines except those with an 'A' or 'K' prefix to the serial number.
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Federal Register Abstract
Pilot Bore
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_60-11-08.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 60-11-08 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: SENSENICH M74DM Propellers Subject: Pilot Bore Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 11/14/1961 Make: Sensenich Propeller Manufacturing Company, Inc. Model: 74DM6 | 74DM7 Product Type: Propeller Product Subtype: Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 60-11-08 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 60-11-08 SUBJECT HEADING: SENSENICH M74DM Propellers ACTION: SUMMARY: DATES: Effective November 14, 1961. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 60-11-08 SENSENICH: Amdt. 166 Part 507 Federal Register May 28, 1960. Applies to M74DM Propellers Installed On Lycoming O-320-B Series Engines Except Propellers With An "A" or "K" prefix to the Serial Number. Compliance required within the next 100 hours of flight time or by August 1, 1960, whichever comes first, and at each periodic inspection thereafter. As a result of three incidents of cracked hubs, the following shall be accomplished: (a) Remove the propeller and visually inspect for cracks originating in the pilot bore. In case of doubt, any of the approved methods for aluminum alloy inspections should be used. If cracks are found, the propeller shall be retired immediately from service. (b) If no cracks are found, polish out any scratches in the bore and break and polish any sharp edges at the front and rear chamfer of the pilot bore. (c) When the propeller is reinstalled, torque retaining bolts to 300 inch-pounds. (Sensenich Service Bulletin No. R-8-1 covers the same subject.) Revised November 14, 1961. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_60-11-08.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 60-11-08 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: SENSENICH M74DM Propellers Subject: Pilot Bore Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 11/14/1961 Make: Sensenich Propeller Manufacturing Company, Inc. Model: 74DM6 | 74DM7 Product Type: Propeller 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: 60-11-08 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 60-11-08 SUBJECT HEADING: SENSENICH M74DM Propellers ACTION: SUMMARY: DATES: Effective November 14, 1961. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 60-11-08 SENSENICH: Amdt. 166 Part 507 Federal Register May 28, 1960. Applies to M74DM Propellers Installed On Lycoming O-320-B Series Engines Except Propellers With An "A" or "K" prefix to the Serial Number. Compliance required within the next 100 hours of flight time or by August 1, 1960, whichever comes first, and at each periodic inspection thereafter. As a result of three incidents of cracked hubs, the following shall be accomplished: (a) Remove the propeller and visually inspect for cracks originating in the pilot bore. In case of doubt, any of the approved methods for aluminum alloy inspections should be used. If cracks are found, the propeller shall be retired immediately from service. (b) If no cracks are found, polish out any scratches in the bore and break and polish any sharp edges at the front and rear chamfer of the pilot bore. (c) When the propeller is reinstalled, torque retaining bolts to 300 inch-pounds. (Sensenich Service Bulletin No. R-8-1 covers the same subject.) Revised November 14, 1961. FOOTER:
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Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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