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D6-27370-866-EGP B-16 Page 1 of 2
CoversFile HighlightMaster Caution System Anomaly EGP-16
Flight Crew Operations Manual Bulletin
for
Egyptair
Number: EGP-16 R1
IssueDate: July 25, 2008
Subject: Master Caution System Anomaly
Reason: This bulletin provides information about a Master Caution system
anomaly during the Light Test.
The purpose of this reissue is to provide Service Letter information.
THE FOLLOWING PROCEDURE AND/OR INFORMATION IS EFFECTIVE UPON RECEIPT
Background Information
A Master Caution system anomaly has been found on 737-600/700/800/900
airplanes at Production Line Number 1640 thru Production Line Number 2168.
These airplanes have provisions for GLS capability and have been equipped with
a new Mode Control Unit (MCU).
When the Master LIGHTS switch is moved to the TEST position during the
Light Test, all system lights and system annunciators will illuminate correctly. If
the Master Caution “PUSH TO RESET” is pressed and released during the test,
all system annunciators on the annunciator panel will extinguish, with the
exception of the IRS annunciaton, and the MASTER CAUTION light will re-
illuminate. The MASTER CAUTION light and IRS light will extinguish when
the Master LIGHTS switch is moved out of the TEST position.
This anomaly is present on Production Line Number 1640 thru Production Line
Number 2168. To correct this anomaly, Boeing installed the P/N 69-37399-13
Mod A MCU starting at Production Line Number 2169.
.Boeing Service Letter 737-SL-34-191 provides information on the upgrade that
corrects this anomaly.
The Boeing Company
Seattle, Washington 98124-2207
Information in this bulletin is recommended by The Boeing Company, but may not be FAA approved
at the time of writing. In the event of conflict with the FAA approved Airplane Flight Manual
(AFM), the AFM shall supersede. The Boeing Company regards the information or procedures
described herein as having a direct or indirect bearing on the safe operation of this model airplane.
September 24, 2015
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