737 Flight Crew Operations Manual
Warning Systems -
System Description
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
15.20.14 D6-27370-866-EGP
RAAS requires the following databases or systems for proper operation:
• terrain and airport runway database is in the GPWS computer,
• airplane is on or approaching an airport in the RAAS airport runway
database,
• global positioning system (GPS) and other required signals are available
and accuracy meets minimum requirements.
When enabled, RAAS operates without any action required from the flight crew.
If desired, RAAS availability can be verified on the ground. There is no automatic
display of RAAS functionality.
RAAS callouts and alerts may be inhibited by the Runway Inhibit switch. To alert
the crew, the RUNWAY INOP Light will illuminate if the Runway Inhibit switch
is in the "INHIBIT" position and the airspeed has been 250 knots or greater for at
least 60 seconds.
Callouts, Alerts and ND Messages During Taxi and Takeoff on RAAS
Airports
Callouts, Alerts and
ND Messages
Description
Callout:
CAUTION ON
TAXIWAY, ON
TAXIWAY
ND amber message:
ON TAXIWAY
Sounds once each time the airplane:
• is on a surface other than a runway, and
• ground speed is greater than 40 knots
APPROACHING
(RUNWAY
IDENTIFIER of
runway end closest to
airplane position)
Sounds once each time the airplane:
• approaches a runway, and
• ground speed is less than 40 knots
APPROACHING
RUNWAYS
Sounds once each time the airplane:
• approaches two runways within 20 degrees of
each other, and
• ground speed is less than 40 knots
September 25, 2014
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