AD 55-14-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Piper Aircraft Inc. | PA-23 | Airworthiness Directives; Piper Model PA-23 Aircraft |
Unsafe Condition
Possible damage to hydraulic actuating cylinders for the landing gear system and flap system of the two end plug retaining pins due to excessive pressures caused by thermal expansion.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect hydraulic actuating cylinders. Replace with new reinforced cylinder P/N 455927 if housing is upset or fractured. Either replace with P/N 455927 or reinforce by adding two retaining plugs per Piper Service Letter No. 250 if housing is not damaged.
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Compliance Time
by August 1, 1955
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Affected Aircraft
Piper Aircraft Inc. Model PA-23, Serial Numbers 23-1 to 23-208 inclusive.
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Federal Register Abstract
Hydraulic Cylinder Replacement
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_55-14-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 55-14-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Piper Model PA-23 Aircraft Subject: Hydraulic Cylinder Replacement Status: Current Citation: This information is not available. Citation Publish Date: 12/04/1956 Effective Date: Make: Piper Aircraft Inc. Model: PA-23 Product Type: Aircraft Product Subtype: Small Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: AIR-700: Compliance & Airworthiness Division Office of Primary Responsibility: AIR-720: Operational Safety Branch CFR Part Reference: Part 39 Comments: unable to find issue date AIRWORTHINESS DIRECTIVES FINAL RULES: 55-14-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 55-14-02 SUBJECT HEADING: Airworthiness Directives; Piper Model PA-23 Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 55-14-02 PIPER: Applies to Model PA-23 Serial Numbers 23-1 to 23-208 Inclusive. Compliance required by August 1, 1955. Because of possible damage to the hydraulic actuating cylinders for the landing gear system and flap system of the two end plug retaining pins, as a result of excessive pressures caused by thermal expansion, it is necessary that these cylinders be inspected and replaced or modified as follows: 1. If the cylinder housing is upset or fractured, it must be replaced by a new reinforced cylinder P/N 455927. (Piper Service Bulletin No. 138 dated May 9, 1955, covers this same subject.) 2. If the cylinder housing is not upset or fractured, it must either be replaced by P/N 455927, or reinforced by adding two retaining plugs in accordance with Piper Service Letter No. 250 dated June 8, 1955. This supersedes AD 55-12-01. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_55-14-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 55-14-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Piper Model PA-23 Aircraft Subject: Hydraulic Cylinder Replacement Status: Current Citation: This information is not available. Citation Publish Date: 12/04/1956 Effective Date: Make: Piper Aircraft Inc. Model: PA-23 Product Type: Aircraft Product Subtype: Small Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: AIR-700: Compliance & Airworthiness Division Office of Primary Responsibility: AIR-720: Operational Safety Branch CFR Part Reference: Part 39 Comments: unable to find issue date AIRWORTHINESS DIRECTIVES FINAL RULES: 55-14-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 55-14-02 SUBJECT HEADING: Airworthiness Directives; Piper Model PA-23 Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 55-14-02 PIPER: Applies to Model PA-23 Serial Numbers 23-1 to 23-208 Inclusive. Compliance required by August 1, 1955. Because of possible damage to the hydraulic actuating cylinders for the landing gear system and flap system of the two end plug retaining pins, as a result of excessive pressures caused by thermal expansion, it is necessary that these cylinders be inspected and replaced or modified as follows: 1. If the cylinder housing is upset or fractured, it must be replaced by a new reinforced cylinder P/N 455927. (Piper Service Bulletin No. 138 dated May 9, 1955, covers this same subject.) 2. If the cylinder housing is not upset or fractured, it must either be replaced by P/N 455927, or reinforced by adding two retaining plugs in accordance with Piper Service Letter No. 250 dated June 8, 1955. This supersedes AD 55-12-01. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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