737 Flight Crew Operations Manual
Warning Systems -
Controls and Indicators
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
15.10.4 D6-27370-866-EGP
Mach/Airspeed Warning and Stall Warning Test Switches
1 MACH AIRSPEED WARNING TEST Switches
Push – tests respective mach/airspeed warning system
• clacker sounds
• inhibited while airborne.
2 STALL WARNING TEST Switches
Push – on ground with AC power available: each test switch tests its respective
stall management yaw damper (SMYD) computer. No.1 SMYD computer shakes
Captain’s control column, No.2 SMYD computer shakes First Officer’s control
column. Vibrations can be felt on both columns
• inhibited while airborne.
NO. 2NO. 1
STALL WARNING TEST
NO 2NO 1
AIRSPEED
WARNING
MACH
TEST
September 24, 2007
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