AD 46-06-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Gladden Products Corp. | Kinner R-5 Series 2 | KINNER Model R-5 Series 2, R-55, and R-56 Engines |
| engine | Gladden Products Corp. | Kinner R-55 | KINNER Model R-5 Series 2, R-55, and R-56 Engines |
| engine | Gladden Products Corp. | Kinner R-56 | KINNER Model R-5 Series 2, R-55, and R-56 Engines |
Unsafe Condition
Master rod knuckle pinholes may not fit properly with the knuckle pins, leading to potential failure of the connecting rod assembly.
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Required Actions
Grind the master rod knuckle pinholes to a fit of 0.0003 to 0.0008-inch (tight) with the knuckle pins. Rebore the connecting rod bushings, replace the knuckle pins and wrist pin bushings. Mark engine serial numbers with an 'O' to indicate rework completion.
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Compliance Time
Rework required immediately if total engine time has already exceeded 500 hours, or if not, rework must be accomplished before exceeding 500 hours.
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Affected Aircraft
Gladden Products Corp. Kinner R-5 Series 2, R-55, and R-56 engines installed on Fairchild 24J, 24JS, 24W Series, Jobmaster DGA-18K, Meyers OTW-160, and Ryan ST-3KR airplanes with engine serial numbers: 12005 to 12319 inclusive; 12805 to 12846 inclusive; 12938 to 12948 inclusive; 12950 to 12952 inclusive; 12954 to 12973 inclusive; 12975 to 12976 inclusive; 13034 to 13037 inclusive; and 13040 to 13056 inclusive.
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Federal Register Abstract
Master Rod Knuckle Pinholes
Applicability Source Text
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AD Final Rules - DRS_46-06-03.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 46-06-03 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: KINNER Model R-5 Series 2, R-55, and R-56 Engines Subject: Master Rod Knuckle Pinholes Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Gladden Products Corp. Model: Kinner R-5 Series 2 | Kinner R-55 | Kinner R-56 Product Type: Engine Product Subtype: Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 46-06-03 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 46-06-03 SUBJECT HEADING: KINNER Model R-5 Series 2, R-55, and R-56 Engines ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 46-06-03 KINNER: (Was Mandatory Note 5 of AD-707-2: 9 of AD-749-1: Special Note 12 of AM-231 and 4 of AD-336.) Applies Only to Fairchild 24J, 24JS, and 24W Series, Jobmaster DGA-18K, Meyers OTW-160, and Ryan ST-3KR Airplanes Having R-5 Series 2 (Military R-540-2) Engines, R-55 (R-540-1) Engines of the Following R-56 (R-540-3) Engines: 12005 to 12319 Inclusive; 12805 to 12846 Inclusive; 12938 to 12948 Inclusive; 12950 to 12952 Inclusive; 12954 to 12961 Inclusive; 12963 to 12973 Inclusive; 12975 to 12976 Inclusive; 13034 to 13037 Inclusive; and 13040 to 13056 Inclusive. Rework required immediately, if total engine time has already exceeded 500 hours, or if not, rework must be accomplished before exceeding 500 hours. Grind the master rod knuckle pinholes to a fit of 0.0003 to 0.0008-inch (tight) with the knuckle pins. This will necessitate reboring the connecting rod bushings, replacement of the knuckle pins and wrist pin bushings. The letter "O" preceding the engine serial number will indicate that this rework has already been accomplished. (Kinner Service Bulletins Nos. KCE-33 and KCE-4 cover this same subject.) FOOTER:
Document Text
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AD Final Rules - DRS_46-06-03.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 46-06-03 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: KINNER Model R-5 Series 2, R-55, and R-56 Engines Subject: Master Rod Knuckle Pinholes Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Gladden Products Corp. Model: Kinner R-5 Series 2 | Kinner R-55 | Kinner R-56 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: 46-06-03 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 46-06-03 SUBJECT HEADING: KINNER Model R-5 Series 2, R-55, and R-56 Engines ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 46-06-03 KINNER: (Was Mandatory Note 5 of AD-707-2: 9 of AD-749-1: Special Note 12 of AM-231 and 4 of AD-336.) Applies Only to Fairchild 24J, 24JS, and 24W Series, Jobmaster DGA-18K, Meyers OTW-160, and Ryan ST-3KR Airplanes Having R-5 Series 2 (Military R-540-2) Engines, R-55 (R-540-1) Engines of the Following R-56 (R-540-3) Engines: 12005 to 12319 Inclusive; 12805 to 12846 Inclusive; 12938 to 12948 Inclusive; 12950 to 12952 Inclusive; 12954 to 12961 Inclusive; 12963 to 12973 Inclusive; 12975 to 12976 Inclusive; 13034 to 13037 Inclusive; and 13040 to 13056 Inclusive. Rework required immediately, if total engine time has already exceeded 500 hours, or if not, rework must be accomplished before exceeding 500 hours. Grind the master rod knuckle pinholes to a fit of 0.0003 to 0.0008-inch (tight) with the knuckle pins. This will necessitate reboring the connecting rod bushings, replacement of the knuckle pins and wrist pin bushings. The letter "O" preceding the engine serial number will indicate that this rework has already been accomplished. (Kinner Service Bulletins Nos. KCE-33 and KCE-4 cover this same subject.) FOOTER:
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Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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