Boeing 737-800 - Bank Angle Alert; Roll;Yaw Asymmetry Alert; Roll Authority Alert

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.
D6-27370-866-EGP 15.20.21
Bank Angle Alert
The GPWS provides the aural alert BANK ANGLE, BANK ANGLE when there
is excessive roll of the airplane. Once sounded, the alert is silent for that bank
angle until the system is reset by decreasing the bank angle to 30 degrees or less.
The alert is based on radio altitude and bank angle:
• from 5 feet to 30 feet AGL, the alert sounds when the bank angle
exceeds 10 degrees
• from 30 feet to 130 feet AGL, when the alert sounds varies linearly from
a bank angle of 10 degrees at 30 feet AGL, to a bank angle of 35 degrees
at 130 feet AGL
• above 130 feet AGL, the alert sounds when the bank angle exceeds 35,
40 or 45 degrees.
YW273, YW274
Roll/Yaw Asymmetry Alert
When the autopilot has reached 75% of its total roll authority:
• An amber alert, ROLL/YAW ASYMMETRY appears on the Primary
Flight Display (PFD);
• the bank pointer and slip/skid indicator become outlined in amber;
• if the slip/skid indicator is deflected greater than 25% of its width, the
slip/skid indicator becomes solid amber.
Roll Authority Alert
When the autopilot has reached 100% of its total roll authority:
• The amber alert, ROLL AUTHORITY appears on the PFD;
• an aural alert, "ROLL AUTHORITY, ROLL AUTHORITY,"
annunciates;
• the bank pointer and slip/skid indicator outlines in amber;
• if the bank angle exceeds 15 degrees, the bank pointer becomes solid
amber;
• if the slip/skid indicator is deflected greater than 25% of its width, the
slip/skid indicator becomes solid amber.
September 15, 2016