Allison Engine Company
ENGINE, FUEL AND CONTROL, BENDIX POWER TURBINE GOVERNOR
INCREASED PRESSURE BENCH CALIBRATION
NOTE: This CEB transmits Bendix Service Bulletin GT-196 dated April 28.
1988 for incorporation as directed by Allison.
1. PLANNING INFORMATION
A. Effectivitv:
The following 250-C20 Series Bendix Power Turbine Governors are
eligible for modification.
ALLISON P/N BENDIX P'
C20 Series 23007505 2524667-12
23007506 2524769-11
B. Reason:
This CEB allows conversion of current C20 Series Bendix Power Turbine
Governors to be usable on both C20R Series and C20 Series engines.
C. Approval: Technical aspects are FAA approved.
D. Compliance:
Compliance Code 7. To be complied with per customer option.
E. Prerequisite:
This bulletin lists only those part numbers accept,able for
conversion. Direct modification from the presently configured unit
to the latest configuration may not be possible without incorporation
of additional CEBs.
PRODUCT SUPPORT
Allison Engine Company
April 29, 1988 250-C20, C2OB. C2DF, CEB 1244
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Service Bulletin
Fuel Systems Bulletin No.: GT-196
Date: 4-29-88
Revsed:
SUBJECI: POWER TURBINE GOVERNORS, ALLIED/BENDIX MODEL AL-AA1 - CONVERSION TO
CONFIGURATIONS USABLE ON ALLISON 250-CZOR/l AND 250-CZOR/Z ENGINES.
1. PLANNING INFORMATION:
Effectivity:
Bendix Model AL-AA1 Power Turbine Governors, Allied/Bendix Parts List Number
(P/L) 2524667-12 (AGTD 23007505) and Parts List Number 2524769-11 (AGTD
23007506).
Reason:
To provide instructions to convert the subject governors to configurations
usable on Allison 250-CZOR Series Engines and current 250-C20 Series
Engines.
Description:
This bulletin lists parts and specifications required for the following
conversions :
convert to:
Model AlliedjBendix P/L (Allison P/N) Allied/Bendix P/L (Allison P/N)
AL-AA1 2524667-12 (23007505) 2549025-l (23036657)
AL-AA1 2524769-11 (23007506) 2549026-l (23036658)
m: This bulletin lists only those parts list numbers acceptable
for conversion.
Compliance:
As defined by Allison in the initial pages of CEB-1244.
April 29, 1988 250-~20. C2OB, C2OF, CEB 1244
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GT-196
1. PLANNING INFORMAT': (Continued)
E. Approval:
Technical aspects are FAA approved
F. Manpower:
No additional man-hours required if converted at time of overhaul.
G. Material:
Parts per unit required for conversion of Model AL-AA1 Power Turbine
Governors from P/L 2524667-12 (23007505) to P/L 2549025-I (23036657) and P/L
2524769-11 (23007506) to P/L 2549026-l (23036658):
New Pert No. GYL Description Replec~ Part No. !zL
2542371 1 Identification Plate -L--- ___
H. Tooling:
Not applicable.
I. Weight and Balance:
Not affected.
J. Electrical Load Data:
Not affected
K. !+ferences:
(1) Model AL-AA1 Component Maintenance Manuel with Illustrated Parts List
Bendix Form No. 15-885.
(2) AGTD CEB-1244, and AEM CW4328
2. ACCOMPLISHMENTINSTRUCTIONS:
A. To convert Model AL-AA1 Power Turbine Governors from P/I. 2524667-12
(23007505) to P/L 2549025-l (23036657), and from P/L 2524769-11 (23007506)
to P/L 2549026-I (23006658), disassemble as required for conversion only or
overhaul in accordance with the applicable component mlaintenance manual.
B. Refer to Figure 1 or Figure 2 for the Final Calibration Limits applicable to
power turbine governors being converted in accordance with this bulletin, 8s
follows:
April 29, 1988 250-C20, C208, C2OF, CEB 1244
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GT-196
2. ACCOMPLISHMENTINSTRUCTIONS: (Continued)
Received as: Converting to: Applicable Final
Parts List No. (P/N1 Parts List No. (P/N) Calibration Limits
2524667-12 (23007505) 2549025-I (23036657) Figure 1
2524769-11 (23007506) 2549026-l (23036658) Figure 2
m: PC pressure at Test Point 2.03 has been increased from 110 to
130 PSIA (758.45 to 896.35 kPa).
3. IDENTIFICATION:
Reidentify Model AL-AA1 Power Turbine Governors converted in accordance with the
bulletin as follows:
Received as: Reidentify as:
nodel Allied/Bendix P/L (Allison PJN) Allied/Bendix P/L (Allison P/N)
AL-AA1 2524667-12 (23007505) 2549025-I (23036657)
AL-AA1 2524769-11 (23007506) 2549026-l (23036658)
Stamp the information on a yellow, service identification plate P/N 2542371 per
the referenced manual instructions. Retain removed identification plate with
the work order for the unit.
4. DISPOSITION OF PARTS REMOVEDAND NEWAND UNUSEDLIKE PARTS IN STOCK:
Not applicable.
April 29, 1988 250-C20, C20B. C2OF. CEB 1244
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FINAL
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m-PO I
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A.
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B. DRIVE RonTION ccw AS “IEVE” FRO” SHAF? END OF CONrROL
c. SET PR-PG YITHIN 0.34 OF VALUE SPECIFIED.
0. “SE THE 25501688 AoAPrER FOR OVERSPEED
CALIBRATION To PC-PY LI”IT.9. c.
0. NO AImJTusmm IS PERnISS,*LE
ON NAxIm? mm- STOP.
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3.01
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