Fire Warning and Master Caution System
FLT CONT  ELEC 
IRS  APU 
FUEL  OVHT/DET 

ANTI-ICE  ENG 
HYD  OVERHEAD 
DOORS  AIR COND 

FIRE WARN Lights
Illuminated (red) – indicates a fire warning (or system test) in engine, APU or main gear wheel well
.
fire warning bell sounds

.
if on ground, remote APU fire warning horn sounds. Push – extinguishes both master FIRE WARN lights

.
silences fire warning bell

.
silences remote APU fire warning horn

.
resets system for additional warnings.

Note:  Pushing fire warning bell cutout switch on overheat/fire protection panel results in same actions.

MASTER CAUTION Lights Illuminated (amber) – a system annunciator light has illuminated. Push – extinguishes both MASTER CAUTION lights
.
system annunciator light(s) extinguish

.
resets system for additional master caution conditions.

Warning Systems -Controls and Indicators 737 Operations Manual

System Annunciator Panel
Illuminated (amber) – an amber light, relating to illuminated system annunciator, has illuminated on forward overhead, aft overhead or overheat/fire protection panel.
To extinguish – push either MASTER CAUTION light.
To recall – push and release either System Annunciator Panel
.  
if a master caution condition exists, appropriate system annunciator(s)
and MASTER CAUTION lights illuminate

.  
a single fault in certain redundant systems, or some simple faults, cause
the system annunciator light to illuminate during a recall. The system
annunciator light will extinguish when the MASTER CAUTION light is
pushed

Mach/Airspeed Warning and Stall Warning Test Switches

MACH AIRSPEED WARNING TEST Switches
Push – tests respective Mach/Airspeed warning system:
. clacker sounds

STALL WARNING TEST Switches
Push – on ground with 115 volt AC power available: each test switch tests its respective stall management computer. Vibrations are
.
felt on both columns

.
inhibited while airborne.

Copyright . The Boeing Company. See title page for details.
15.10.2   December 1, 2000
Warning Systems -Controls and Indicators
737 Operations Manual
Landing Gear Warning Cutout Switch
HORN
CUTOUT
1

CONTROL STAND
Landing Gear Warning Cutout Switch
Push – silences landing gear configuration warning aural indication:
.  
at flaps 1 through 10

.  
at flaps 15, when either forward thrust lever is between idle and
approximately 10 degrees and opposite forward thrust lever is greater than
approximately 30 degrees.

Note: Cutout switch cannot silence aural indication if flaps are greater than 15.
Altitude Alert
ALTITUDE
1
ALERT
CAPT INST PANEL
F/O INST PANEL

Copyright . The Boeing Company. See title page for details.
Warning Systems -Controls and Indicators 737 Operations Manual

ALTITUDE ALERT Annunciation
One on each pilot’s primary display above altimeter.
Illuminated (amber) –
Airplanes with Standard Alert System
.
steady – acquisition alert

.  
within 900 feet of selected altitude, ALT ALERT annunciation displays steady

.
momentary tone also sounds

.  
within 300 feet from selected altitude, ALT ALERT annunciation no longer shows

.
flashing – deviation alert

.  
deviation more than 300 feet from MCP-selected altitude, ALT ALERT annunciation flashes

.
momentary tone also sounds

.
flashing continues until:

.
altitude deviation less than 300 feet, or

.
altitude deviation more than 900 feet, or

.
new MCP altitude selected.

Airplanes with Alternative Alert System
.
steady – acquisition alert

.  
within 750 feet of MCP-selected altitude, ALT ALERT annunciation displays steady

.  
within 250 feet from selected altitude, ALT ALERT annunciation is no longer displayed

.
flashing – deviation alert

.  
deviation more than 250 feet from MCP-selected altitude, ALT ALERT annunciation flashes

.
momentary tone also sounds

.
　
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