# AD 64-26-02: Starter Drive Shaft Bearing - Type: Airworthiness directive - Status: Current - Products: General Electric CT58-100-1, T58-GE-5, T58-GE-1, CT58-100-2, CT58-110-1 and CT58-140-1 - Effective: June 3, 1966 - Published: June 3, 1966 - Issued: May 26, 1966 - Superseded by: Nothing supersedes this AD - Product type: Engine - Amendment: 39-3 - Registered aircraft: 20 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/13EFA150A493EFE68625682B00673BE5.0001 - DRS record last changed: November 21, 2025 - Page: https://openairdocs.org/ad/64-26-02 ## The airworthiness directive 64-26-02 GENERAL ELECTRIC: Amdt. 39-3 Part 39 (New) Federal Register November 25, 1964. Applies to Models CT58-100-1, -100-2, -110-1 Engines; Model CT58-140-1 Engines Serial Numbers 295001 through 295018; Model T58-GE-1 Engines; and Model T58-GE-5 Engines, Serial Numbers 285001 through 285016. Compliance required as indicated. As a result of several failures of the starter drive shaft bearing and resultant engine power loss, accomplish the following: (a) For engines with a starter drive shaft bearing that has 990 or more hours' time in service on the effective date of this AD, comply with (c) within 10 hours' time in service after the effective date of this AD and at intervals thereafter not to exceed 10 hours' time in service from the last inspection. (b) For engines with a starter drive shaft bearing that has less than 990 hours' time in service on the effective date of this AD, comply with (c) prior to the accumulation of 1,000 hours' time in service and at intervals thereafter not to exceed 10 hours' time in service from the last inspection. (c) Remove the magnetic plug from the accessory drive gear casing assembly and inspect for presence of metal chips or particles. If chips or particles are found, either remove the engine from service or locate and repair the condition causing these chips or particles before further flight. (d) Upon request of the operator, an FAA maintenance inspector, subject to prior approval of the Chief, Engineering and Manufacturing Branch, FAA Eastern Region, may adjust the repetitive inspection intervals specified in this AD to permit compliance at an established inspection period of the operator if the request contains substantiating data to justify the increase for such operator. (e) Within the next 1,600 hours' time in service after July 5, 1966, accomplish the following: (1) On installations that incorporate General Electric starter Model 2CM270D3 or 2CM270D5, install front frame accessory drive pinion bearing, P/N 4002T03 (Vendor P/N HDB003-9), and modify starter by incorporating a new field winding assembly, P/N 36A227553G01 or 36A227554G01. Stamp a "B" on the starter nameplate after the starter model number on starters, Model 2CM270D3, and a "C" on the nameplate after the starter model number on starters, Model 2CM270D5, to indicate the field winding assembly has been changed. (Starter Models 2CM270D3B and 2CM270D5C have been modified at the factory.) (2) On installations which incorporate starters other than General Electric Model 2CM270D3 or 2CM270D5, install front frame accessory drive pinion bearing, P/N 4002T03D03 (Vendor P/N HDB003-9). (f) The inspections required by (a) through (c) may be discontinued upon the accomplishment of the installations and modifications specified in (e). (General Electric Commercial Engine Bulletin No. 141 and General Electric Starter Service Bulletin No. 80-2 pertain to this subject.) This directive effective November 25, 1964. Revised June 3, 1966. ## Affected data sheets (1) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS 1E3](https://openairdocs.org/tcds/1E3): General Electric Company; names 3 of 5 models: CT58-100-2, CT58-140-1, CT58-110-1 ## 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: 20 (0 by airframe model, 20 by engine model) - Makers: Sikorsky 18, Boeing-Vertol 1, Carson Helicopters / Sikorsky 1 Models with the most aircraft: - [GE CT58-140-1](https://openairdocs.org/engine/ge-ct58-140-1): 20 aircraft (engine model) All 1 models: https://openairdocs.org/ad/64-26-02/models.md Every aircraft: https://openairdocs.org/ad/64-26-02/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.