SERVICE LETTER
Engine – Approved Engine Fuels – Revision to
Line Maintenance Manual
1. Planning Information
A. Effectivity:
This document applies to the following Williams International turbofan engines:
ENGINE MODEL ENGINE PART ENGINE SERIAL
NUMBER NUMBER NUMBERS
FJ44-1A 45700-104 ALL
FJ44-1AP 72100-200 ALL
FJ44-1AP 72100-201 ALL
FJ44-2A 56000 ALL
FJ44-2A 56000-103 ALL
FJ44-2A 56000-104 ALL
FJ44-2C 60500 ALL
FJ44-2C 60500-103 ALL
FJ44-3A 67000-200 ALL
FJ44-3A 67000-202 ALL
FJ44-3A-24 75000-200 ALL
FJ44-3AP 111000-202 ALL
FJ44-4A 73200-200 ALL
FJ44-4A-32 127000-200 ALL
FJ44-4A-QPM 73200-201 ALL
FJ44-4M 135000 ALL
FJ44-4M-34 136000 ALL
FJ33-5A 79400-201 ALL
FJ33-5A 79400-205 ALL
B. Reason:
To remove Kathon FP 1.5 from the approved engine fuels task (72-00-01 P.B. 601)
prior to being incorporated into the applicable Line Maintenance Manuals.
Additionally, to revise the Biobor note in the same task.
C. Compliance:
Not Applicable.
PROPRIETARY INFORMATION
All information and technical data disclosed herein are the property of Williams International and are not to be duplicated or
disclosed to others for any purpose without the written consent of Williams International, Pontiac, MI.
Original Release Date – Apr. 06/20 WISL-72-1132
Page 1 of 4
SERVICE LETTER
D. Coverage:
Not Applicable.
E. Description:
This service document modifies 72-00-01 P.B. 301 or 601 of the applicable Line
Maintenance Manuals.
F. Approval:
The technical content of this service document is FAA approved as applicable to the
engine models and serial numbers identified. It is the aircraft owner/operator
responsibility to coordinate with the appropriate aviation authority overseeing the
aircraft maintenance and operations, as required, prior to flight.
G. Manpower:
Not Applicable.
H. Material:
Not Applicable.
I. Tooling Required:
Not Applicable.
J. Weight and Balance:
Not Applicable.
K. Electrical Load Data:
Not Applicable.
L. Software Configuration:
Not Applicable.
PROPRIETARY INFORMATION
All information and technical data disclosed herein are the property of Williams International and are not to be duplicated or
disclosed to others for any purpose without the written consent of Williams International, Pontiac, MI.
Original Release Date – Apr. 06/20 WISL-72-1132
Page 2 of 4
SERVICE LETTER
M. References:
FJ44-1A Line Maintenance Manual.
FJ44-1AP Line Maintenance Manual.
FJ44-2A Line Maintenance Manual.
FJ44-2C Line Maintenance Manual.
FJ44-3A/3A-24 Line Maintenance Manual.
FJ44-3A (67000-202) Line Maintenance Manual.
FJ44-3AP Line Maintenance Manual.
FJ44-4A/4A-32 Line Maintenance Manual.
FJ44-4A-QPM Line Maintenance Manual.
FJ44-4M Line Maintenance Manual.
FJ44-4M-34 Line Maintenance Manual.
FJ33-5A Line Maintenance Manual.
N. Other Publications Affected:
Not Applicable.
O. Family Tree Charts of Modification Relationships:
Not Applicable.
PROPRIETARY INFORMATION
All information and technical data disclosed herein are the property of Williams International and are not to be duplicated or
disclosed to others for any purpose without the written consent of Williams International, Pontiac, MI.
Original Release Date – Apr. 06/20 WISL-72-1132
Page 3 of 4
SERVICE LETTER
2. Accomplishment Instructions
All Models EXCEPT FJ44-1A, FJ44-2A, and FJ44-2C
The note regarding Kathon FP 1.5 has been removed (see below for the note in reference).
NOTE: Kathon FP 1.5 at a concentration of 100 to 150 ppm for normal usage and 150 to
300 ppm for heavily contaminated systems.
All Models
The note regarding the SOHIO Biobor JF biocide additive is as follows.
NOTE: SOHIO Biobor JF biocide additive is approved at a concentration not to exceed
20 ppm (270 ppm total additive) of elemental boron. Refer to the Airframe
Manufacture's maintenance and operating manuals for additional treatment
considerations.
The rest of the procedure remains unchanged.
PROPRIETARY INFORMATION
All information and technical data disclosed herein are the property of Williams International and are not to be duplicated or
disclosed to others for any purpose without the written consent of Williams International, Pontiac, MI.
Original Release Date – Apr. 06/20 WISL-72-1132
Page 4 of 4
