# AD 49-50-01: Generator Drive Coupling Rubber Disc - Type: Airworthiness directive - Status: Current - Products: Continental Motors C-125-1, C-125-2, C145-2, C145-2H, C90-12F, C90-12FH, C90-12FJ, C90-12FP, C90-14F, C90-14FH, C90-14FJ, C90-16F and 18 more - Superseded by: Nothing supersedes this AD - Product type: Engine - Registered aircraft: 9,190 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/301AFE061CDFE0528625682C005A92AF.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/49-50-01 ## The airworthiness directive 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. ImprovedType - 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. ## Affected data sheets (4) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS E-233](https://openairdocs.org/tcds/E-233): Continental Aerospace Technologies, Inc.; names 16 of 31 models: C85-14F, C85-12F, C75-8F, C75-15, C75-8FHJ, C75-8FJ, C85-8FHJ, C85-12J… - [TCDS E-252](https://openairdocs.org/tcds/E-252): Continental Aerospace Technologies, Inc.; names 10 of 15 models: C90-8F, C90-12F, C90-12FP, C90-8FJ, C90-14FJ, C90-12FH, C90-12FJ, C90-16F… - [TCDS E-236](https://openairdocs.org/tcds/E-236): Continental Aerospace Technologies, Inc.; names 2 of 4 models: C-125-1, C-125-2 - [TCDS E-253](https://openairdocs.org/tcds/E-253): Continental Aerospace Technologies, Inc.; names 2 of 8 models: C145-2, C145-2H ## Registered aircraft it may apply to (OpenAirDocs) Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment. - Aircraft: 9,190 (0 by airframe model, 9,190 by engine model) - Makers: Cessna 3,896, Piper 1,338, Aeronca 871, Luscombe 454, Champion 417, Ercoupe 337, Globe 296, Engineering & Research 206, Alon 158, Taylorcraft 114 Models with the most aircraft: - [Continental C85 series](https://openairdocs.org/engine/continental-c85-series): 4,671 aircraft (engine model) - [Continental C90 series](https://openairdocs.org/engine/continental-c90-series): 2,149 aircraft (engine model) - [Continental C145 series](https://openairdocs.org/engine/continental-c145-series): 1,828 aircraft (engine model) - [Continental C125 series](https://openairdocs.org/engine/continental-c125-series): 322 aircraft (engine model) - [Continental C85-12F](https://openairdocs.org/engine/continental-c85-12f): 90 aircraft (engine model) - [Continental C90-12F](https://openairdocs.org/engine/continental-c90-12f): 54 aircraft (engine model) - [Continental C90-8F](https://openairdocs.org/engine/continental-c90-8f): 30 aircraft (engine model) - [Continental C85-8FJ](https://openairdocs.org/engine/continental-c85-8fj): 11 aircraft (engine model) - [Continental C145-2](https://openairdocs.org/engine/continental-c145-2): 11 aircraft (engine model) - [Continental C90-14F](https://openairdocs.org/engine/continental-c90-14f): 11 aircraft (engine model) - [Continental C90-16F](https://openairdocs.org/engine/continental-c90-16f): 4 aircraft (engine model) - [Continental C75-12F](https://openairdocs.org/engine/continental-c75-12f): 3 aircraft (engine model) - [Continental C-125-2](https://openairdocs.org/engine/continental-c-125-2): 2 aircraft (engine model) - [Rolls Royc C90-14 series](https://openairdocs.org/engine/rolls-royc-c90-14-series): 1 aircraft (engine model) - [Continental C85-14F](https://openairdocs.org/engine/continental-c85-14f): 1 aircraft (engine model) - [Continental C85-15F](https://openairdocs.org/engine/continental-c85-15f): 1 aircraft (engine model) - [Continental C145-2H](https://openairdocs.org/engine/continental-c145-2h): 1 aircraft (engine model) All 17 models: https://openairdocs.org/ad/49-50-01/models.md Every aircraft: https://openairdocs.org/ad/49-50-01/aircraft.md Its text cites no advisory circulars or STCs. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.