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CoversFile HighlightU10.8A FMC Restarts from ATC ADS LogonEGP-27
Flight Crew Operations Manual Bulletin
for
Egyptair
Number: EGP-27 R1
IssueDate: June 5, 2013
Subject: U10.8A FMC Restarts from ATS (Air Traffic Services) or AOC
(Aeronautical Operational Control) Datalink issues
Reason: The reason for this revision is to inform flight crews of the possibility of
the FMC resetting or of the FMC prompt on the MCDU Menu page
flashing when using ATS or AOC Datalink.
THE FOLLOWING PROCEDURE AND/OR INFORMATION IS EFFECTIVE UPON RECEIPT
Background Information
ATS Datalink issue:
A condition present in the Update 10.8A FMC software may cause any of the
following anomalies:
• FMC software to perform a restart
• Flashing of the FMC prompt on the MCDU Menu page when using ADS
• Significant slowdown of FMC operation.
The condition is due to the FMC retaining unused ADS downlink messages in its
Air Traffic message queue. These messages can be erroneously retained in the
FMC queue after an unexpected loss of the HF or SATCOM data link between
the airplane and the ground.
This condition has been reported to occur during operation of the FMC FANS-1
ATS data link.
The following is required for the condition to occur:
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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