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D6-27370-866-EGP B-2 Page 1 of 2
CoversFile HighlightHead-Up Display (HUD) Software AnomalyEGP-2
Flight Crew Operations Manual Bulletin
for
Egyptair
Number: EGP-2
IssueDate: October 2, 2006
Subject: Head-Up Display (HUD) Software Anomaly
Reason: This bulletin informs flight crews of a discrepancy between the airspeed
indications on the HUD and on the EFIS or PFD for 737-800/900
airplanes.
THE FOLLOWING PROCEDURE AND/OR INFORMATION IS EFFECTIVE UPON RECEIPT
Background Information
In Common Display System (CDS) Block Points 2004 and on, the VREF+15
(white) bug on the EFIS Mach/Airspeed Indicator and on the PFD speed tape is
changed to a VREF+20 (white) bug for 737-800/900 airplanes. This change
provides the appropriate tail clearance margin during a one engine inoperative
flaps 15 landing.
The Head-Up Display (HUD) has a VREF+15 (PRI in flight mode) bug for all
737-600/700/800/900 airplanes.
A fix for 737-800/900 airplanes is being considered for a future update of the
HUD software.
Operating Instructions
On 737-800/900 airplanes with CDS Block Points 2004 and later, do not use the
HUD indication of VREF+15 for a one engine inoperative flaps 15 landing. Use
the EFIS Mach/Airspeed Indicator or PFD speed tape indication of VREF+20.
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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