AD 54-01-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Hamilton Standard Division | 232 | HAMILTON STANDARD Models 43D, 43E, 34D, 34E, 232 and 242 Propellers |
| aircraft | Hamilton Standard Division | 242 | HAMILTON STANDARD Models 43D, 43E, 34D, 34E, 232 and 242 Propellers |
| aircraft | Hamilton Standard Division | 34D | HAMILTON STANDARD Models 43D, 43E, 34D, 34E, 232 and 242 Propellers |
| aircraft | Hamilton Standard Division | 34E | HAMILTON STANDARD Models 43D, 43E, 34D, 34E, 232 and 242 Propellers |
| aircraft | Hamilton Standard Division | 43D | HAMILTON STANDARD Models 43D, 43E, 34D, 34E, 232 and 242 Propellers |
| aircraft | Hamilton Standard Division | 43E | HAMILTON STANDARD Models 43D, 43E, 34D, 34E, 232 and 242 Propellers |
| propeller | Hamilton Standard Division | 232 | HAMILTON STANDARD Models 43D, 43E, 34D, 34E, 232 and 242 Propellers |
| propeller | Hamilton Standard Division | 242 | HAMILTON STANDARD Models 43D, 43E, 34D, 34E, 232 and 242 Propellers |
| propeller | Hamilton Standard Division | 34D | HAMILTON STANDARD Models 43D, 43E, 34D, 34E, 232 and 242 Propellers |
| propeller | Hamilton Standard Division | 34E | HAMILTON STANDARD Models 43D, 43E, 34D, 34E, 232 and 242 Propellers |
| propeller | Hamilton Standard Division | 43D | HAMILTON STANDARD Models 43D, 43E, 34D, 34E, 232 and 242 Propellers |
| propeller | Hamilton Standard Division | 43E | HAMILTON STANDARD Models 43D, 43E, 34D, 34E, 232 and 242 Propellers |
Unsafe Condition
The low pitch stop wedge can move forward from its position under the stop levers under vibratory conditions, allowing the propeller to travel into the reverse range upon governor demand for lower pitch.
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Required Actions
Rework all low pitch stop levers and wedges as specified in Hamilton Standard Service Bulletin No. 273 and its Supplement No. 273A.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Prior to June 1, 1954
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Affected Aircraft
Hamilton Standard Models 43D, 43E, 34D, 34E, 232, and 242 Propellers incorporating Low Pitch Stop Assemblies with Wedge Return Springs or Wedge Inserts on specified aircraft models.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Stop Levers
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_54-01-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 54-01-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: HAMILTON STANDARD Models 43D, 43E, 34D, 34E, 232 and 242 Propellers Subject: Stop Levers Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Hamilton Standard Division Model: 232 | 242 | 34D | 34E | 43D | 43E 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: Updated RGL applicability to match AD applicability; CAR C-11-185 AIRWORTHINESS DIRECTIVES FINAL RULES: 54-01-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 54-01-02 SUBJECT HEADING: HAMILTON STANDARD Models 43D, 43E, 34D, 34E, 232 and 242 Propellers ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 54-01-02 HAMILTON STANDARD: Applies to Hamilton Standard Reversing Propellers Models 43D, 43E, 34D, 34E, 232 and 242 Incorporating Low Pitch Stop Assemblies With Wedge Return Springs; and Models 43E, 34D, 232 and 242 Incorporating Low Pitch Stop Assemblies With Wedge Inserts, on Boeing 377, Convair 240 and 340 Series, Douglas DC-6 Series, Lockheed 49 Series, Martin 202 and 404 Series Aircraft. Compliance required as indicated. Investigations of three recent incidents in commercial service in which the propeller inadvertently reversed during approach, have indicated the possibility that the low pitch stop wedge, under vibratory conditions, can move forward from its position under the stop levers, allowing the propeller to travel into the reverse range upon governor demand for lower pitch. Therefore, to minimize the forward forces applied against the stop wedge by piston-to-stop-lever contact at the low pitch position, it is necessary to remove the 2 degree pitch angle from the stop lever and wedge contact surfaces. Prior to June 1, 1954, rework all low pitch stop levers and wedges as specified in Hamilton Standard Service Bulletin No. 273 and its Supplement No. 273A. This supersedes AD 53-15-01. FOOTER:
Document Text
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AD Final Rules - DRS_54-01-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 54-01-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: HAMILTON STANDARD Models 43D, 43E, 34D, 34E, 232 and 242 Propellers Subject: Stop Levers Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Hamilton Standard Division Model: 232 | 242 | 34D | 34E | 43D | 43E 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: Updated RGL applicability to match AD applicability; CAR C-11-185 AIRWORTHINESS DIRECTIVES FINAL RULES: 54-01-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 54-01-02 SUBJECT HEADING: HAMILTON STANDARD Models 43D, 43E, 34D, 34E, 232 and 242 Propellers ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 54-01-02 HAMILTON STANDARD: Applies to Hamilton Standard Reversing Propellers Models 43D, 43E, 34D, 34E, 232 and 242 Incorporating Low Pitch Stop Assemblies With Wedge Return Springs; and Models 43E, 34D, 232 and 242 Incorporating Low Pitch Stop Assemblies With Wedge Inserts, on Boeing 377, Convair 240 and 340 Series, Douglas DC-6 Series, Lockheed 49 Series, Martin 202 and 404 Series Aircraft. Compliance required as indicated. Investigations of three recent incidents in commercial service in which the propeller inadvertently reversed during approach, have indicated the possibility that the low pitch stop wedge, under vibratory conditions, can move forward from its position under the stop levers, allowing the propeller to travel into the reverse range upon governor demand for lower pitch. Therefore, to minimize the forward forces applied against the stop wedge by piston-to-stop-lever contact at the low pitch position, it is necessary to remove the 2 degree pitch angle from the stop lever and wedge contact surfaces. Prior to June 1, 1954, rework all low pitch stop levers and wedges as specified in Hamilton Standard Service Bulletin No. 273 and its Supplement No. 273A. This supersedes AD 53-15-01. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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