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250-C20/C20B CEB-1060250-B17/B17B TP CEB-1037COMMERCIAL ENGINE BULLETIN overha

Qc\ Detruit Diesel AllisonIndianapolis. Indiana 46206PAGE 1 OF -

August 15, 19GEARBOX ASSY, NO. 2 l/2 ROLLER BEARING ASSY--REPLACE

PLANNING INFORMATION:EFFECTIVITY: All Series II Gearbox (Engine) Assem blies priorto the following Gearbox (Eng ine) serial numbers

Gearbox CorrespondinMode l Serial N(i Eng ine Serial 250-C20 CAG 32834 exclud- CAE 822813ing CAG 32826, excluding32828, 32829 and CAE 822805,32832 822807, 8228and 822811250-C20B CAG 33087 exclud- CAE 830086ing CAG 33080, excluding33082, 33083 and CAE 830079,33084 830081, 8300and 830083250-B17 CAG 60060 CAE 870060250-B17B CAG 80019 exclud- CAE 880117ing CAG 80017 excludingCAE 880115

REASON: A new and improved bearing is released to theNo. 2 l/2 position of all 250 Series II powerand accessory gearbox assemb lies. The newbearing is the same as the superseded bearingexcept that it incorporates full crowned rollersinstead of cylindrical rollers. This featureprovides the capacity for greater misalignment.

Revision No. 1Y,.7 INovember 30, 1976

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250-C20/C20B CEB-1060250-B17/B17B TP CEB-1037Page 2COMMERCIAL ENGINE BULLETIN

GEARBOX ASSY, NO. 2 l/2 ROLLER BEARING ASSY--REPLACE

DESCRIPTION: At time of overhaul, P/N 6875027 BearingAssem bly (cylindrical rollers) is replaced withP/N 6890914 Bearing Assembly (full crownedrollers).INTERCHANGEABILITY: Not affected.COMPLIANCE: It is recommended that this bulletin be accom plishedat next overhaul following parts availab ility.APPROVAL: FAA-DER ApprovedMANPOWER: No aditiona l time will be required to accom plishthis bulletin at time of overhaul.MATERIAL AVAILABILITY: Part No. Nomenclature Qty/Eng.

6890914 Bearing Assy, Outer 1Race and RollersTOOLING: NoneWEIGHT AND BALANCE: Not affected.REFERENCE: CW-1191

Revision No. 1November 30, 1976Published August 15, 197

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I 250-C20/C20B CEB-1060250-B17/Bl?B TP CEB-1037Page 3COMMERCIAL ENGINE BULLETIN

GEARBOX ASSY, NO. 2 l/2 ROLLER BEARING ASSY-REPLACE

ACCOMPLISHMENT INSTRUCTIONS:I. At time of overhaul, inspect a nd comply as required.

A. Check the part number of the No. 2 l/2 Bearing at disassembly.B. If P/N 6875027 Bearing was installed, replace with P/N 6890914at reassembly.

II. Record compliance with 250-C20/C20B CEB-1060 or 250-B17/B17BTP CEB-1037 in the Gearbox Assembly (yellow pages), ModificationRecord, Part IIl of the Engine Log Book.

MATERIAL INFORMATION:New P/N Qty Nomenclature Old P/N Qty Disposition-6890914 1

IBearing Assy, Outer Race 6875027 1 Scrap remoand Rollers part only

M JK/awService ManagerGas Turbine Engines

Revision No. 1November 30, 1976Published August 15, 1975

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