AD 53-03-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sierra Hotel Aero, Inc. | Navion B | Airworthiness Directives; Navion All Model B Aircraft |
Unsafe Condition
Vibration characteristics of the Hartzell HC-12 X20-8C/9333C-0 propeller installed on the Lycoming GO-435 engine revealed hazardous vibration that could cause blade cracks and/or failures.
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Required Actions
Revise the existing r.p.m. restriction placard to state: 'Avoid continuous ground operation between 1675 and 2150 engine r.p.m.'
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Compliance Time
March 15, 1953
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Affected Aircraft
Sierra Hotel Aero, Inc. Navion B aircraft equipped with Hartzell HC-12 X20-8C/9333C-0 propellers.
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Federal Register Abstract
Hartzell Propeller Vibration
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_53-03-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 53-03-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Navion All Model B Aircraft Subject: Hartzell Propeller Vibration Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Sierra Hotel Aero, Inc. Model: Navion B Product Type: Aircraft Product Subtype: Small Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 53-03-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 53-03-01 SUBJECT HEADING: Airworthiness Directives; Navion All Model B Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 53-03-01 NAVION: Applies to All Model B Aircraft Equipped With Hartzell HC-12 X20-8C/9333C-0 Propellers. Compliance required not later than March 15, 1953. Vibration tests conducted subsequent to the initial tests of the Hartzell HC-12 X20- 8C/9333C-0 propeller installed on the Lycoming GO-435 engine revealed vibration characteristics of a hazardous nature. Therefore, to prevent possible blade cracks and/or failures, the existing r.p.m. restriction placard should be revised as follows: "Avoid continuous ground operation between 1675 and 2150 engine r.p.m." FOOTER:
Document Text
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AD Final Rules - DRS_53-03-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 53-03-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Navion All Model B Aircraft Subject: Hartzell Propeller Vibration Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Sierra Hotel Aero, Inc. Model: Navion B Product Type: Aircraft Product Subtype: Small Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 53-03-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 53-03-01 SUBJECT HEADING: Airworthiness Directives; Navion All Model B Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 53-03-01 NAVION: Applies to All Model B Aircraft Equipped With Hartzell HC-12 X20-8C/9333C-0 Propellers. Compliance required not later than March 15, 1953. Vibration tests conducted subsequent to the initial tests of the Hartzell HC-12 X20- 8C/9333C-0 propeller installed on the Lycoming GO-435 engine revealed vibration characteristics of a hazardous nature. Therefore, to prevent possible blade cracks and/or failures, the existing r.p.m. restriction placard should be revised as follows: "Avoid continuous ground operation between 1675 and 2150 engine r.p.m." FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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