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k%J-Cl& A, ndr L L3LrJl250-C20, -C20B CSL1055250-B15G TP CSLr29250-Bl?, B17B TP CSL1040COMMERCIAL SERVICE LETTER

e7 Detroit Diesel Allison

Indianapolis. Indiana 46206 Pagelof 3March 31, 1978FAA-DER APPROVEDSUBJECT: GEARBOX, WET SPLIN-E STARTER-GENERATORGEARSHAFT (CUSTOMER OPTION)

In order to reduce the operators cost per flight hour andat the same time increase engine reliability, DDA haspublished the following 250 Engine Commercial EngineBulletins:250-Cl8 CEB-179250-C20)C20B CEB-1082250-B15 TP CEB-32250-B17/B17B TP CEB-1056

In addition Lear Siegler has issued Service Bulletins 23032-04,23032-05, and 23032-06 which cover the modification of thevarious Starter-Generator Assemblies.These Bulletins, when complied with, will reduce splinewear of the Starter-Generator Gearshaft.To convert to the wet spline configuration, both theapplicab le DDA Bulletin and Lear-Siegler Bulletin must beaccomplished simultaneously.For those operators wishing to convert their 250 ModelEngines to the wet spline Starter-Generator Gearshaft, itis suggested that you contact your authorized 250 Distributorto coordinate the planned modifications and thus assureavailability of all required hardware prior to conversion ofeither the engine or the Starter-Generator.The 250 Engine Distributor may act as an agent for obtainingthe Lear-S igler Kit, or operators may obtain this Starter-^ Generator Kit directly from the following Lear-Siegler5

: Distributors:IE

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250-C18, A, B & C CSL91250-C20, -C20B CSL1055250-B15G TP CSL29250-B17, B17B TP CSL1040Page 2COMMERCIAL SERVICE LETTER

A. For Gpera tors in the United Statesand those outside of the United Statesexcept Canada:

American Avitron, Inc.P. 0. Box 567Rye, New York llXS0

B. For Canadian Operators:Aircraft Appliances and Equipment Ltd.152 East DriveBramalea, Ontario, CANADA LCG-T-1El

The following is a chart that may be used to determine which Lear-SieglerStarter-Generator Kit is required for your aircraft:DDA ENGINE INSTALLATION/LEAR SIEGLER SERVICE BULLETIN

CROSS REFERENCEEM AIRCRAFT ENGINE LEAR SIEGLER APPLICABLE LEARMODEL DRY SPLINE SIEGLER SERVICE

STARTER- BULLETINGENERATOR P/N

ell

EAF

206A 250-Cl8 23032-010 23032-04206B 250-C20 23032-010 23032-04206B-1 250-C20 23032-010 23032-04206L 250-CZOB 23032-010 23032-04A109C 250-C20/C20B 23032-010 23032-04AR404 250-B17B 23032-020 23032-05

206A 250-Cl8 23032-010 23032-04206B 250-C20 23032-010 23032-04206L 250-C20B 23032-010 23032-04Nomad N2 250-B17B 23032-020 23032-05

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250-C18, A, B & C CSL91250-C20, -C20B CSL1055250-B15G TP csIP29250-B17, B17B TP CSL1040Page 3

COMMERCIAL SERVICE LETTER

DDA ENGINE INSTALLATION/LEAR SIEGLER SERVICE BULLETINCROSS REFERENCEOEM AIRCRAFT ENGINE LEAR SIEGLER APPLICABLE LEAR

MODEL DRY SPLINE SIEGLER SERVICESTARTER/ BULLETINGENERATOR P/NHiHer FHllOO 250-Cl8 23032-011 23032-06Hughes 500 250X18 23032-020 23032-05

5ooc 250-C20 23032-020 23032-05500D 250-C20B 23032-020 23032-05MBB BO-105 250-CZO/CZOB 23032-020 23032-05Scenic4 :-lines 402 Turbostar 250-B17 23032-020 23032-05Siai-Marchetti SM-1019 250-B15GSoloyConversions UH-12 Series 250-C20

23032-020 23032-05

23032-020 23032-05

NOTES: 1. Lear Siegler Service Bulletin 23032-05 states the modification ofP/N 23032-022 starter generator as its applicability. The 23032 -022 part number is the designation for the 23032-020 model withthe QED attached.The QED is not included in the P/N 23032-010 Starter Genera tor.

If you have any questions on this program, please feel free to contact your authorized250 Distributor.

L. 0. DAVIDSON w *Service ManagerGas Turbine Engines

&KS/cls

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