AD 49-50-01
final rule
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Continental Motors | Teledyne Continental Motors | C-125-1 | CONTINENTAL Models C-75, C-85, C-90, C-125 and C-145 Engines |
| engine | Continental Motors | Teledyne Continental Motors | C-125-2 | CONTINENTAL Models C-75, C-85, C-90, C-125 and C-145 Engines |
| engine | Continental Motors | Teledyne Continental Motors | C145-2 | CONTINENTAL Models C-75, C-85, C-90, C-125 and C-145 Engines |
| engine | Continental Motors | Teledyne Continental Motors | C145-2H | CONTINENTAL Models C-75, C-85, C-90, C-125 and C-145 Engines |
| engine | Continental Motors | Teledyne Continental Motors | C90-12F | CONTINENTAL Models C-75, C-85, C-90, C-125 and C-145 Engines |
| engine | Continental Motors | Teledyne Continental Motors | C90-12FH | CONTINENTAL Models C-75, C-85, C-90, C-125 and C-145 Engines |
| engine | Continental Motors | Teledyne Continental Motors | C90-12FJ | CONTINENTAL Models C-75, C-85, C-90, C-125 and C-145 Engines |
| engine | Continental Motors | Teledyne Continental Motors | C90-12FP | CONTINENTAL Models C-75, C-85, C-90, C-125 and C-145 Engines |
| engine | Continental Motors | Teledyne Continental Motors | C90-14F | CONTINENTAL Models C-75, C-85, C-90, C-125 and C-145 Engines |
| engine | Continental Motors | Teledyne Continental Motors | C90-14FH | CONTINENTAL Models C-75, C-85, C-90, C-125 and C-145 Engines |
| engine | Continental Motors | Teledyne Continental Motors | C90-14FJ | CONTINENTAL Models C-75, C-85, C-90, C-125 and C-145 Engines |
| engine | Continental Motors | Teledyne Continental Motors | C90-16F | CONTINENTAL Models C-75, C-85, C-90, C-125 and C-145 Engines |
| engine | Continental Motors | Teledyne Continental Motors | C90-8F | CONTINENTAL Models C-75, C-85, C-90, C-125 and C-145 Engines |
| engine | Continental Motors | Teledyne Continental Motors | C90-8FJ | CONTINENTAL Models C-75, C-85, C-90, C-125 and C-145 Engines |
| engine | Continental Motors | Teledyne Continental Motors | C75-12F | CONTINENTAL Models C-75, C-85, C-90, C-125 and C-145 Engines |
| engine | Continental Motors | Teledyne Continental Motors | C75-12FH | CONTINENTAL Models C-75, C-85, C-90, C-125 and C-145 Engines |
| engine | Continental Motors | Teledyne Continental Motors | C75-12FJ | CONTINENTAL Models C-75, C-85, C-90, C-125 and C-145 Engines |
| engine | Continental Motors | Teledyne Continental Motors | C75-12J | CONTINENTAL Models C-75, C-85, C-90, C-125 and C-145 Engines |
| engine | Continental Motors | Teledyne Continental Motors | C75-15 | CONTINENTAL Models C-75, C-85, C-90, C-125 and C-145 Engines |
| engine | Continental Motors | Teledyne Continental Motors | C75-8F | CONTINENTAL Models C-75, C-85, C-90, C-125 and C-145 Engines |
| engine | Continental Motors | Teledyne Continental Motors | C75-8FHJ | CONTINENTAL Models C-75, C-85, C-90, C-125 and C-145 Engines |
| engine | Continental Motors | Teledyne Continental Motors | C75-8FJ | CONTINENTAL Models C-75, C-85, C-90, C-125 and C-145 Engines |
| engine | Continental Motors | Teledyne Continental Motors | C85-12F | CONTINENTAL Models C-75, C-85, C-90, C-125 and C-145 Engines |
| engine | Continental Motors | Teledyne Continental Motors | C85-12FJ | CONTINENTAL Models C-75, C-85, C-90, C-125 and C-145 Engines |
| engine | Continental Motors | Teledyne Continental Motors | C85-12J | CONTINENTAL Models C-75, C-85, C-90, C-125 and C-145 Engines |
| engine | Continental Motors | Teledyne Continental Motors | C85-14F | CONTINENTAL Models C-75, C-85, C-90, C-125 and C-145 Engines |
| engine | Continental Motors | Teledyne Continental Motors | C85-15 | CONTINENTAL Models C-75, C-85, C-90, C-125 and C-145 Engines |
| engine | Continental Motors | Teledyne Continental Motors | C85-15F | CONTINENTAL Models C-75, C-85, C-90, C-125 and C-145 Engines |
| engine | Continental Motors | Teledyne Continental Motors | C85-8FHJ | CONTINENTAL Models C-75, C-85, C-90, C-125 and C-145 Engines |
| engine | Continental Motors | Teledyne Continental Motors | C85-8FJ | CONTINENTAL Models C-75, C-85, C-90, C-125 and C-145 Engines |
Unsafe Condition
Disintegration of the generator drive coupling rubber disc could result in engine failure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect and/or replace the rubber disc P/N 22348 prior to May 2, 1949, and at 100-hour intervals. Install improved coupling with metal retainer cup P/N 352030 to discontinue inspections. Replace rubber disc P/N 25120 at major overhaul for improved type couplings.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
prior to May 2, 1949, and upon each 100 hours of operation after inspection has been accomplished, or at major overhaul
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Continental Motors/Teledyne Continental Motors models C-75, C-85, C-90, C-125, and C-145 engines equipped with generators, excluding specific serial numbers listed in the AD.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Generator Drive Coupling Rubber Disc
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_49-50-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 49-50-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: CONTINENTAL Models C-75, C-85, C-90, C-125 and C-145 Engines Subject: Generator Drive Coupling Rubber Disc Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Continental Motors | Teledyne Continental Motors Model: C-125-1 | C-125-2 | C145-2 | C145-2H | C90-12F | C90-12FH | C90-12FJ | C90-12FP | C90-14F | C90-14FH...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: 49-50-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 49-50-01 SUBJECT HEADING: CONTINENTAL Models C-75, C-85, C-90, C-125 and C-145 Engines ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 49-50-01 CONTINENTAL: Applies to All Continental C-75, C-85, C-90, C-125 and C-145 Engines Equipped With Generators, Except Those Engines Listed Below. (A-65 Series Engines Are No Longer Subjected to Compliance With This Note.) To be accomplished prior to May 2, 1949, and upon each 100 hours of operation after inspection has been accomplished, or at major overhaul, as indicated. To preclude possible engine failure as a result of disintegration of the generator drive coupling rubber disc, inspect and/or replace the disc as follows: I. Old Type - Without Metal Retainer Cup. (1) Inspect rubber disc, P/N 22348 prior to May 2, 1949, and at 100-hour intervals after this inspection, and replace if deterioration or cracks are noted. Special attention should be given corners of slot to detect beginning of cracks or tears. (2) Above periodic inspection may be discontinued by installing the improved type of coupling incorporating metal retainer cup P/N 352030. II. Improved Type - With Metal Retainer Cup. (1) Rubber disc P/N 25120 must be replaced at major overhaul. NOTE: Engines with the following serial numbers are excluded from the inspection requirements of this directive. However, if rubber disc P/N 25120 is incorporated, it must be replaced at major overhaul. C-75: Serial No. 5257-7-12 and all higher numbers. C-85: Serial No. 30568-8-12 and all higher numbers. C-90: Serial No. 41132-8-12 and all higher numbers and including Nos. 41122 and 41124 through 41127. C-125: Serial No. 8108-8-2 and all higher numbers. C-145: Serial No. 3470-8-2 and all higher numbers. All "C" model engines reworked at Continental Motors Corp. since September 1, 1948. (Description of generator drive couplings is contained in Continental Motors Corp. Service Bulletin Number M49-4.) This supersedes AD 49-47-01. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_49-50-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 49-50-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: CONTINENTAL Models C-75, C-85, C-90, C-125 and C-145 Engines Subject: Generator Drive Coupling Rubber Disc Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Continental Motors | Teledyne Continental Motors Model: C-125-1 | C-125-2 | C145-2 | C145-2H | C90-12F | C90-12FH | C90-12FJ | C90-12FP | C90-14F | C90-14FH...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: 49-50-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 49-50-01 SUBJECT HEADING: CONTINENTAL Models C-75, C-85, C-90, C-125 and C-145 Engines ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 49-50-01 CONTINENTAL: Applies to All Continental C-75, C-85, C-90, C-125 and C-145 Engines Equipped With Generators, Except Those Engines Listed Below. (A-65 Series Engines Are No Longer Subjected to Compliance With This Note.) To be accomplished prior to May 2, 1949, and upon each 100 hours of operation after inspection has been accomplished, or at major overhaul, as indicated. To preclude possible engine failure as a result of disintegration of the generator drive coupling rubber disc, inspect and/or replace the disc as follows: I. Old Type - Without Metal Retainer Cup. (1) Inspect rubber disc, P/N 22348 prior to May 2, 1949, and at 100-hour intervals after this inspection, and replace if deterioration or cracks are noted. Special attention should be given corners of slot to detect beginning of cracks or tears. (2) Above periodic inspection may be discontinued by installing the improved type of coupling incorporating metal retainer cup P/N 352030. II. Improved Type - With Metal Retainer Cup. (1) Rubber disc P/N 25120 must be replaced at major overhaul. NOTE: Engines with the following serial numbers are excluded from the inspection requirements of this directive. However, if rubber disc P/N 25120 is incorporated, it must be replaced at major overhaul. C-75: Serial No. 5257-7-12 and all higher numbers. C-85: Serial No. 30568-8-12 and all higher numbers. C-90: Serial No. 41132-8-12 and all higher numbers and including Nos. 41122 and 41124 through 41127. C-125: Serial No. 8108-8-2 and all higher numbers. C-145: Serial No. 3470-8-2 and all higher numbers. All "C" model engines reworked at Continental Motors Corp. since September 1, 1948. (Description of generator drive couplings is contained in Continental Motors Corp. Service Bulletin Number M49-4.) This supersedes AD 49-47-01. FOOTER:
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