AD 58-08-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Hamilton Standard Division | 232 | HAMILTON STANDARD Models 23260, 24260, 34D50, 34D51, 34E60, 43E60, and 43H60 Propellers |
| aircraft | Hamilton Standard Division | 242 | HAMILTON STANDARD Models 23260, 24260, 34D50, 34D51, 34E60, 43E60, and 43H60 Propellers |
| aircraft | Hamilton Standard Division | 34D | HAMILTON STANDARD Models 23260, 24260, 34D50, 34D51, 34E60, 43E60, and 43H60 Propellers |
| aircraft | Hamilton Standard Division | 34E | HAMILTON STANDARD Models 23260, 24260, 34D50, 34D51, 34E60, 43E60, and 43H60 Propellers |
| aircraft | Hamilton Standard Division | 43E | HAMILTON STANDARD Models 23260, 24260, 34D50, 34D51, 34E60, 43E60, and 43H60 Propellers |
| aircraft | Hamilton Standard Division | 43H | HAMILTON STANDARD Models 23260, 24260, 34D50, 34D51, 34E60, 43E60, and 43H60 Propellers |
| propeller | Hamilton Standard Division | 232 | HAMILTON STANDARD Models 23260, 24260, 34D50, 34D51, 34E60, 43E60, and 43H60 Propellers |
| propeller | Hamilton Standard Division | 242 | HAMILTON STANDARD Models 23260, 24260, 34D50, 34D51, 34E60, 43E60, and 43H60 Propellers |
| propeller | Hamilton Standard Division | 34D | HAMILTON STANDARD Models 23260, 24260, 34D50, 34D51, 34E60, 43E60, and 43H60 Propellers |
| propeller | Hamilton Standard Division | 34E | HAMILTON STANDARD Models 23260, 24260, 34D50, 34D51, 34E60, 43E60, and 43H60 Propellers |
| propeller | Hamilton Standard Division | 43E | HAMILTON STANDARD Models 23260, 24260, 34D50, 34D51, 34E60, 43E60, and 43H60 Propellers |
| propeller | Hamilton Standard Division | 43H | HAMILTON STANDARD Models 23260, 24260, 34D50, 34D51, 34E60, 43E60, and 43H60 Propellers |
Unsafe Condition
The dome cap of propellers incorporating a pitch lock can become partially disengaged in flight, resulting in complete loss of propeller control.
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Required Actions
Inspect, rework, and/or replace components to reduce the clearance between the dome cap and stop lever sleeve bushing to 0.013 or less.
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Compliance Time
at first propeller overhaul after May 15, 1958, if not already accomplished
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Affected Aircraft
Hamilton Standard Division Models 23260, 24260, 34D50, 34D51, 34E60, 43E60, and 43H60 Propellers incorporating pitch locks
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Pitch Locks
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_58-08-04.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 58-08-04 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: HAMILTON STANDARD Models 23260, 24260, 34D50, 34D51, 34E60, 43E60, and 43H60 Propellers Subject: Pitch Locks Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Hamilton Standard Division Model: 232 | 242 | 34D | 34E | 43E | 43H 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: 58-08-04 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 58-08-04 SUBJECT HEADING: HAMILTON STANDARD Models 23260, 24260, 34D50, 34D51, 34E60, 43E60, and 43H60 Propellers ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 58-08-04 HAMILTON STANDARD: Applies to all Models 23260, 24260, 34D50, 34D51, 34E60, 43E60, and 43H60 Propellers Incorporating Pitch Locks. Compliance required at first propeller overhaul after May 15, 1958, if not already accomplished. Two cases have been reported wherein the dome cap of propellers incorporating a pitch lock become partially disengaged in flight, resulting in complete loss of propeller control. To preclude additional failures of this nature, reduce to 0.013 or less the clearance between the dome cap and stop lever sleeve bushing by conducting the necessary inspection rework, and/or replacement. (Hamilton Standard Service Bulletin No. 496D covers this same subject.) This supersedes AD 58-02-02. FOOTER:
Document Text
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AD Final Rules - DRS_58-08-04.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 58-08-04 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: HAMILTON STANDARD Models 23260, 24260, 34D50, 34D51, 34E60, 43E60, and 43H60 Propellers Subject: Pitch Locks Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Hamilton Standard Division Model: 232 | 242 | 34D | 34E | 43E | 43H 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: 58-08-04 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 58-08-04 SUBJECT HEADING: HAMILTON STANDARD Models 23260, 24260, 34D50, 34D51, 34E60, 43E60, and 43H60 Propellers ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 58-08-04 HAMILTON STANDARD: Applies to all Models 23260, 24260, 34D50, 34D51, 34E60, 43E60, and 43H60 Propellers Incorporating Pitch Locks. Compliance required at first propeller overhaul after May 15, 1958, if not already accomplished. Two cases have been reported wherein the dome cap of propellers incorporating a pitch lock become partially disengaged in flight, resulting in complete loss of propeller control. To preclude additional failures of this nature, reduce to 0.013 or less the clearance between the dome cap and stop lever sleeve bushing by conducting the necessary inspection rework, and/or replacement. (Hamilton Standard Service Bulletin No. 496D covers this same subject.) This supersedes AD 58-02-02. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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