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CoversFile HighlightCabin Altitude Warning Indications and Procedures BriefingEGP-18
Flight Crew Operations Manual Bulletin
for
Egyptair
Number: EGP-18 R1
IssueDate: June 8, 2009
Subject: Cabin Altitude Warning Indications and Procedures Briefing
Reason: This revision is to inform flight crews that the FAA has agreed to an
Alternative Method of Compliance (AMOC) to the takeoff briefing
mandated by AD 2008-23-07. The requirement to don oxygen masks
only applies when the intermittent warning horn sounds and the airplane
flight altitude is above 10,000 feet MSL.
THE FOLLOWING PROCEDURE AND/OR INFORMATION IS EFFECTIVE UPON RECEIPT
Background Information
The B737 cabin altitude warning system consists of an intermittent warning horn
that sounds when cabin altitude exceeds 10,000 feet. Both the cabin altitude
warning and takeoff configuration warning use the same intermittent horn.
Following a fatal accident in August 2005, the FAA initiated planned
Airworthiness Directive (AD) action to provide additional cabin altitude warning
information for B737 flight crews.
To support this planned AD, Boeing has designed a change to the warning
system to provide separate “CABIN ALTITUDE” and “TAKEOFF CONFIG”
warning lights to accompany the existing dual-purpose intermittent warning
horn. This design change is now available on production airplanes. Service
bulletin information to support the planned AD will become available in mid-
2009.
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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