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250-C20 CEB-107COMMERCIAL ENGINE BULLETINOerhau

QT Detroit Diesel AllisonIndianapolis. Indiana 46206PAGE I OFMarch 27, 19

CECO MC-40 GOVERNOR, SPEED ROTOR ASSEM BLY-REWO RKPLANNING INFORMATION:EFFECTIVITY: All CECO Parts List No. 104100 Series Governors priorto Serial No. 4AAD3350.

All CECO Parts List No. 104900 Series Governors (multengine applications) prior to Serial No. 4ACK410 .REASON: To provide a removable speed rotor screen which willfacilitate cleaning of the speed rotor assembly prior tofinal assembly.DESCRIPTION: The rotor and screen assembly is reworked or replacedand the speed rotor assemb ly reidentified.COMPLIANCE: Modification is recommended at first repair or overhaul(whichever occurs first) following parts availability.APPROVAL: FAA-DER Approved.MANPOWER: It is estimated that approximately one additional manhouwill be required at time of overhaul.PARTS AVAILABILITY: New CECO P/N Nomenclature &tY

101151 * Rotor and, Screen Assy 196268 ** Screen, Speed Rotor 1* May be reworked from P/N 96445.** Required for rework of P/N 96445 to P/N 101151.

INTERCHANGEABILITY: All changes in this bulletin must be accomplishedsimultaneour;ly.TOOLING: NoneWEIGHT AND BALANCE: Not affected.REFERENCES: CW-1144CECO PC0 74-58

Rolls-Royce Proprietary Data Uncontrolled Printed Copy

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250-C20 CEB-1070OverhaulCOMMERCIAL ENGINE BLLT+lN

CECO MC-40 GOVERNOR, SPEED ROTOR ASSEMBLY-REWORK

ACCOMPLISHMENT INSTRUCTIONS:At first repair or overhaul following parts availab ility, rework P/N96445 Rotor and Screen Assembly.I. Disassemble the governor, clean and inspect parts in accordancewith 250-C20 Overhaul Manual (Appendix Bl).

II. Rework serviceable P/N 96445 Rotor and Screen Assemb ly asfollows:A. Remove screen and machine rotor and shaft assembly as follows:

1. Remove as much of the spot-welded-on P/N 96268 Screen(See Figure 1) as possible by cutting. Use care not todamage rotor.2. Clean up rotor and shaft assembly diameter to remove anyscreen or spot weld remnants by mach ining 0.762-o. 758inch diameter as shown on Figure 2.3. Machine two crimping grooves in rotor and shaft assemblyas shown on Figure 2.

B. Assemble and reidentify rotor and screen assem bly as follows:1. Assemble and crimp new P/N 96268 Screen onto rotor andshaft assembly as shown on Figure 3.2. Mark the letter E on the end of the shaft (see Figure 3)by chemical or electrolytic etch, or by use of a hand-operated vibrating scriber.3. Reidentify rotor and screen assembly as P/N 101151 bytagging or marking container.

C. If rotor and screen assembly cannot be reworked, replace w ithP/N 101151.


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250-C20 CEB-1070OverhaulPage 3 COMMERCIAL ENGINE BULLETIN

CECO MC-40 GOVERNOR, SPEED ROTOR ASSEMBLY-REWORK

/-ROTOR AND SCREENASSY P/N 96445

SCREENP/N 96268

P/N 96445 ROTOR AND SCREENFIGURE 1


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250-C20 CEB-1070OverhaulPage 4COMMERCIAL ENGINE BULLETIN

EEI-YZ/--170 0

110 o RELATIVE TO aI

0.020 40.030 -0.012MIN[xi

/ \ / \ROTOR AND SHAFT

MISMATCH

f 0.7620.758

I

L .00 R MIN(CPTIONAL - STRAIGHTCUT TO DEPTH SHOWN)

MACHINE TO THISDIA TO CLEAN UPSPOTWELDANDSCREEN REMNANTSBEFORE CUTTINGGROOVES -

MACHINING OF ROTOR AND SHAFT ASSEMBLYFIGURE 2


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250-C20 CEB-1070OverhaulPage 5 COMMERCIAL ENGINE BULLETIN

CECO MC-40 GOVERNOR, SPEED ROTOR ASSE:MBLY-REWORK

MARK (SHAFT BY CHEMICALOR ELECTROLYTIC ElOR BY HAND SCRIBING

ASSEMB LE CHAMFER THIS SIDENOGAP BETWEENSCREEN ANDMARK ON END OF ROTOR PERMISSIBLESHAFT BY CHEMICAL

OR ELECTROLYTIC ETCHCH

\\

SCREENCREEN

ROTOR AND SHAFT

CRIMP SCREEN INTO fSLOTS 2 PLACES APPROX180 DEGRE ES APAR l

P/N 101151 ROTOR AND SCREEN ASSEMBLYFIGURE 3


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250-C20 CEB-1070OverhaulPage 6COMMERCIAL ENGINE BULLETINCECO MC-40 GOVERNOR, SPEED ROTOR ASSEMBLY-REWOR K

ILL Reassem ble speed rotor assembly in accordance with 250-C20 Overhau lManual (Appendix Bl) and reidentify assemblies by tagging or markingcontainer as follows:A. Reidentify speed rotor assembly as P/N 101149.B. Reidentify complete speed rotor assembly as P/N 101152.

lv. Reassemble the governor in accordance with 250-C20 Overhaul Manual(Appendix Bl). Record compliance with 250-C20 CEB-1070 in EngineAssem bly (white pages) Modification Record, Part III of the Eng ine LogBook.


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250-C20 CEB-1070OverhaulPage 7COMMERCIAL ENGINE BULLETIN

CECO MC-40 GOVERNOR, SPEE D ROTOR ASSEM BLY-REWORK

MATERIAL INFORMATION:New P/N Qty Nomenclature Old P/N Qty Dispositio101152 1 Rotor Assy, Speed, Complete 96266 1 1101149 1 Rotor Assy, Speed 96267 1 1101151 1 Rotor and Screen Assy 9 6445 1 196268 1 Screen, Speed Rotor 96268 1 2

STOCK DISPOSITION NOTES:1 Rework and reidentify2 Scrap removed part

L. 0. DavidsonService ManagerAircraft Engi.nesMJK/bsc


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