AD 46-36-01
final rule
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Continental Motors | A-65-1 | CONTINENTAL Models A-65, A-75, A-80 Series Engines |
| engine | Continental Motors | A-65-12 | CONTINENTAL Models A-65, A-75, A-80 Series Engines |
| engine | Continental Motors | A-65-12F | CONTINENTAL Models A-65, A-75, A-80 Series Engines |
| engine | Continental Motors | A-65-12FJ | CONTINENTAL Models A-65, A-75, A-80 Series Engines |
| engine | Continental Motors | A-65-12J | CONTINENTAL Models A-65, A-75, A-80 Series Engines |
| engine | Continental Motors | A-65-14 | CONTINENTAL Models A-65, A-75, A-80 Series Engines |
| engine | Continental Motors | A-65-14F | CONTINENTAL Models A-65, A-75, A-80 Series Engines |
| engine | Continental Motors | A-65-14FJ | CONTINENTAL Models A-65, A-75, A-80 Series Engines |
| engine | Continental Motors | A-65-14J | CONTINENTAL Models A-65, A-75, A-80 Series Engines |
| engine | Continental Motors | A-65-3 | CONTINENTAL Models A-65, A-75, A-80 Series Engines |
| engine | Continental Motors | A-65-6 | CONTINENTAL Models A-65, A-75, A-80 Series Engines |
| engine | Continental Motors | A-65-6J | CONTINENTAL Models A-65, A-75, A-80 Series Engines |
| engine | Continental Motors | A-65-7 | CONTINENTAL Models A-65, A-75, A-80 Series Engines |
| engine | Continental Motors | A-65-8 | CONTINENTAL Models A-65, A-75, A-80 Series Engines |
| engine | Continental Motors | A-65-8F | CONTINENTAL Models A-65, A-75, A-80 Series Engines |
| engine | Continental Motors | A-65-8FJ | CONTINENTAL Models A-65, A-75, A-80 Series Engines |
| engine | Continental Motors | A-65-8J | CONTINENTAL Models A-65, A-75, A-80 Series Engines |
| engine | Continental Motors | A-65-9 | CONTINENTAL Models A-65, A-75, A-80 Series Engines |
| engine | Continental Motors | A-65-9F | CONTINENTAL Models A-65, A-75, A-80 Series Engines |
| engine | Continental Motors | A-65-9FJ | CONTINENTAL Models A-65, A-75, A-80 Series Engines |
| engine | Continental Motors | A-65-9J | CONTINENTAL Models A-65, A-75, A-80 Series Engines |
| engine | Continental Motors | A75-3 | CONTINENTAL Models A-65, A-75, A-80 Series Engines |
| engine | Continental Motors | A75-6 | CONTINENTAL Models A-65, A-75, A-80 Series Engines |
| engine | Continental Motors | A75-6J | CONTINENTAL Models A-65, A-75, A-80 Series Engines |
| engine | Continental Motors | A75-8 | CONTINENTAL Models A-65, A-75, A-80 Series Engines |
| engine | Continental Motors | A75-8F | CONTINENTAL Models A-65, A-75, A-80 Series Engines |
| engine | Continental Motors | A75-8FJ | CONTINENTAL Models A-65, A-75, A-80 Series Engines |
| engine | Continental Motors | A75-8J | CONTINENTAL Models A-65, A-75, A-80 Series Engines |
| engine | Continental Motors | A75-9 | CONTINENTAL Models A-65, A-75, A-80 Series Engines |
| engine | Continental Motors | A75-9J | CONTINENTAL Models A-65, A-75, A-80 Series Engines |
| engine | Continental Motors | A-80-5J | CONTINENTAL Models A-65, A-75, A-80 Series Engines |
| engine | Continental Motors | A-80-8 | CONTINENTAL Models A-65, A-75, A-80 Series Engines |
| engine | Continental Motors | A-80-8J | CONTINENTAL Models A-65, A-75, A-80 Series Engines |
| engine | Continental Motors | A-80-9 | CONTINENTAL Models A-65, A-75, A-80 Series Engines |
| engine | Continental Motors | A-80-9J | CONTINENTAL Models A-65, A-75, A-80 Series Engines |
Unsafe Condition
Piston pins installed in engines with serial numbers from 3456658 to 4109568, or those with A-21422 piston pins or new 3-Ring pistons installed since September 25, 1945, are subject to failure without warning. The weakness cannot be detected by normal inspection methods, and breakage can cause complete engine failure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace piston pin P/N A-21422 with thick wall piston pin No. A-25127. Examine pistons for skirt cracks and rework the bottom rib by reducing its height and rounding sharp corners. Alternatively, install cam ground pistons P/N 40731 with larger diameter piston pins.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
50 hours of engine operation after August 27, 1946
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Affected Aircraft
Continental Models A-65, A-75, A-80 Series Engines with serial numbers from 3456658 to 4109568 inclusive, or those with A-21422 piston pins or new 3-Ring pistons installed since September 25, 1945.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Piston Pins
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_46-36-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 46-36-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: CONTINENTAL Models A-65, A-75, A-80 Series Engines Subject: Piston Pins Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Continental Motors Model: A-65-1 | A-65-12 | A-65-12F | A-65-12FJ | A-65-12J | A-65-14 | A-65-14F | A-65-14FJ | A-65-14J | A-6...Show more Product Type: Engine 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: 46-36-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 46-36-01 SUBJECT HEADING: CONTINENTAL Models A-65, A-75, A-80 Series Engines ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 46-36-01 CONTINENTAL: (Was Mandatory Note 8 of AD-675-2: 11 of AD-728-1; 2 of AD-751-1; 1 of AD-761-2; 6 of AD-718-6; 9 of AD-737-1; 1 of AD-759-3; 11 of AD-729-1; 8 of AD-720-1; 2 of AD-611-1; 9 of AD-725-1; 11 of AD-691-1; 9 of AD-703-1; 5 of AD-740-1; 9 of AD-725-1; 10 of AD-694-4; 6 of AD-709-1; 8 of AD-730-2; 8 of AD-746-1; and 11 of AD-696-3.) Applies to Aeronca 65-CA; 65-TC, 65-TAC, YO-58; O-58A, O-58B, SO-58B; 11AC; Air Products (Erco) 415-C, 415-CD; CallAir S-1A; Champion 7AC, S7AC; Commonwealth (Rearwin) 175, 180, 185; Northwestern (Porterfield) CP-65, CS-65; 75C; Piper AE-1, HE-1; J3C-65, J3C-65S; J4, J4A, J4A-S; J4E; J5A, J5A-80, J5C; Silvaire (Luscombe) 8, 8A, 8B, 8C, 8D, 8E; Stinson HW-75, 10; Superior (Culver) LCA; Taylorcraft DC-65, DCO-65; Universal (Taylorcraft) BC, BCS, BC-65, BCS-65, BC12-65, BCS12-65, BC12-D, BC12-D1, BCS12-D1 Airplanes Having Continental A-65 Series Engines With Serial Numbers From 3456658 to 4109568, Inclusive; or Continental A-65, A-75, or A-80 Series Engines Which Have Had A-21422 Piston Pins or New 3-Ring Pistons Installed Since September 25, 1945. Compliance required immediately if possible, but in any event not later than 50 hours of engine operation after August 27, 1946. A certain percentage of piston pins installed in engines of the above numbers and distributed as replacement parts are subject to failure without warning. The weakness of these pins cannot be detected by normal inspection methods. Piston pin breakage can result in complete engine failure. It is the owner's responsibility to avoid this risk by making the changes outlined in (a) and (b) at the earliest possible time. (a) Replace piston pin P/N A-21422 (0.626 inch inside diameter) with thick wall piston pin No. A-25127 (0.5945 inch inside diameter). The engine manufacturer has given assurance that every possible effort will be made to supply the required quantity of replacement piston pins. (b) Simultaneously with (a), all pistons should be examined for skirt cracks and the necessity for rework of the bottom rib. This rework involves reducing the height of the rib until it is at least 1/16-inch wide and rounding all sharp corners. (c) As an acceptable alternate to (a) and (b), cam ground pistons, P/N 40731, which necessitate using piston pins of greater outside diameter, may be installed. This change will likewise remove the possibility of piston pin failure and piston skirt cracking. (Continental Motors Service Bulletin M46-6 covers this same subject.) FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_46-36-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 46-36-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: CONTINENTAL Models A-65, A-75, A-80 Series Engines Subject: Piston Pins Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Continental Motors Model: A-65-1 | A-65-12 | A-65-12F | A-65-12FJ | A-65-12J | A-65-14 | A-65-14F | A-65-14FJ | A-65-14J | A-6...Show more Product Type: Engine 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: 46-36-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 46-36-01 SUBJECT HEADING: CONTINENTAL Models A-65, A-75, A-80 Series Engines ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 46-36-01 CONTINENTAL: (Was Mandatory Note 8 of AD-675-2: 11 of AD-728-1; 2 of AD-751-1; 1 of AD-761-2; 6 of AD-718-6; 9 of AD-737-1; 1 of AD-759-3; 11 of AD-729-1; 8 of AD-720-1; 2 of AD-611-1; 9 of AD-725-1; 11 of AD-691-1; 9 of AD-703-1; 5 of AD-740-1; 9 of AD-725-1; 10 of AD-694-4; 6 of AD-709-1; 8 of AD-730-2; 8 of AD-746-1; and 11 of AD-696-3.) Applies to Aeronca 65-CA; 65-TC, 65-TAC, YO-58; O-58A, O-58B, SO-58B; 11AC; Air Products (Erco) 415-C, 415-CD; CallAir S-1A; Champion 7AC, S7AC; Commonwealth (Rearwin) 175, 180, 185; Northwestern (Porterfield) CP-65, CS-65; 75C; Piper AE-1, HE-1; J3C-65, J3C-65S; J4, J4A, J4A-S; J4E; J5A, J5A-80, J5C; Silvaire (Luscombe) 8, 8A, 8B, 8C, 8D, 8E; Stinson HW-75, 10; Superior (Culver) LCA; Taylorcraft DC-65, DCO-65; Universal (Taylorcraft) BC, BCS, BC-65, BCS-65, BC12-65, BCS12-65, BC12-D, BC12-D1, BCS12-D1 Airplanes Having Continental A-65 Series Engines With Serial Numbers From 3456658 to 4109568, Inclusive; or Continental A-65, A-75, or A-80 Series Engines Which Have Had A-21422 Piston Pins or New 3-Ring Pistons Installed Since September 25, 1945. Compliance required immediately if possible, but in any event not later than 50 hours of engine operation after August 27, 1946. A certain percentage of piston pins installed in engines of the above numbers and distributed as replacement parts are subject to failure without warning. The weakness of these pins cannot be detected by normal inspection methods. Piston pin breakage can result in complete engine failure. It is the owner's responsibility to avoid this risk by making the changes outlined in (a) and (b) at the earliest possible time. (a) Replace piston pin P/N A-21422 (0.626 inch inside diameter) with thick wall piston pin No. A-25127 (0.5945 inch inside diameter). The engine manufacturer has given assurance that every possible effort will be made to supply the required quantity of replacement piston pins. (b) Simultaneously with (a), all pistons should be examined for skirt cracks and the necessity for rework of the bottom rib. This rework involves reducing the height of the rib until it is at least 1/16-inch wide and rounding all sharp corners. (c) As an acceptable alternate to (a) and (b), cam ground pistons, P/N 40731, which necessitate using piston pins of greater outside diameter, may be installed. This change will likewise remove the possibility of piston pin failure and piston skirt cracking. (Continental Motors Service Bulletin M46-6 covers this same subject.) FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.
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