AD 57-10-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Piper Aircraft Inc. | PA-23 | Airworthiness Directives; Piper Model PA-23 Aircraft |
Unsafe Condition
The flare on the oil pressure gage line has cracked or broken where it attaches to the connector fitting on the aft side of the firewall, resulting in loss of oil pressure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect both right and left oil pressure line flares to ensure they are intact and that the lines near the flares are not cracked or broken. Replace cracked or broken lines or those with defective flares by cutting off and reflaring, ensuring no line strain against fittings or retainer blocks. If the line is too short, cut off and splice using Piper P/N 17766-07 or equivalent connector and flexible hose.
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Compliance Time
not later than June 15, 1957
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Affected Aircraft
Piper Aircraft Inc. Model PA-23 Aircraft, serial numbers 23-1 to 23-1391 inclusive.
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Federal Register Abstract
Oil Pressure Gage Line
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_57-10-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 57-10-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Piper Model PA-23 Aircraft Subject: Oil Pressure Gage Line Status: Current Citation: This information is not available. Citation Publish Date: 08/01/1957 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Date: Make: Piper Aircraft Inc. Model: PA-23 Product Type: Aircraft Product Subtype: Small Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: AIR-700: Compliance & Airworthiness Division Office of Primary Responsibility: AIR-720: Operational Safety Branch CFR Part Reference: Part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: 57-10-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 57-10-02 SUBJECT HEADING: Airworthiness Directives; Piper Model PA-23 Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 57-10-02 PIPER: Applies to Model PA-23 Aircraft Serial Numbers 23-1 to 23-1391 Inclusive. Compliance required as soon as possible but not later than June 15, 1957. It has been reported that the flare on the oil pressure gage line has cracked or broken where it attaches to the connector fitting on the aft side of the firewall resulting in loss of oil pressure. Inspect both right and left oil pressure line flares to determine whether or not they are normal and also to determine that the lines in the area of the flares are not cracked or broken. Lines that are cracked or broken or have defective flares should be cut off and reflared. Care should be taken that there is no line strain against the fitting or the retainer block and that the line into the fitting is straight. If the line is too short for this repair, it should be cut off and spliced using a connector and flexible hose, Piper P/N 17766-07 or equivalent. (Piper Service Bulletin No. 152A covers this subject.) FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_57-10-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 57-10-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Piper Model PA-23 Aircraft Subject: Oil Pressure Gage Line Status: Current Citation: This information is not available. Citation Publish Date: 08/01/1957 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: 57-10-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 57-10-02 SUBJECT HEADING: Airworthiness Directives; Piper Model PA-23 Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 57-10-02 PIPER: Applies to Model PA-23 Aircraft Serial Numbers 23-1 to 23-1391 Inclusive. Compliance required as soon as possible but not later than June 15, 1957. It has been reported that the flare on the oil pressure gage line has cracked or broken where it attaches to the connector fitting on the aft side of the firewall resulting in loss of oil pressure. Inspect both right and left oil pressure line flares to determine whether or not they are normal and also to determine that the lines in the area of the flares are not cracked or broken. Lines that are cracked or broken or have defective flares should be cut off and reflared. Care should be taken that there is no line strain against the fitting or the retainer block and that the line into the fitting is straight. If the line is too short for this repair, it should be cut off and spliced using a connector and flexible hose, Piper P/N 17766-07 or equivalent. (Piper Service Bulletin No. 152A covers this subject.) FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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