Fire Warning and Master Caution System
FIRE  MASTER 
WARN  CAUTION 
BELL CUTOUT  PUSH TO RESET 

FLT CONT  ELEC 
IRS  APU 
FUEL  OVHT/DET 

HYD DOORS ANTI-ICE  OVERHEAD AIR COND ENG  CAUTION PUSH TO RESET MASTER  WARN BELL CUTOUT FIRE 

Master Fire Warning (FIRE WARN) Lights
Illuminated (red) – indicates a fire warning (or system test) in engine, cargo, 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.

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

Proximity Switch Electronic Unit Light

Proximity Switch Electronic Unit (PSEU) Light
Illuminated (amber) – . on the ground –
.
a fault is detected in the PSEU, or

.
an overwing exit flight lock fails to disengage when commanded.

.
in-flight –

.  
inhibited from thrust lever advance for takeoff until 30 seconds after landing.

Copyright . The Boeing Company. See title page for details.
15.10.2   March 29, 2004

Warning Systems -Controls and Indicators
Mach/Airspeed Warning and Stall Warning Test Switches

MACH AIRSPEED WARNING TEST Switches
Push – tests respective mach/airspeed warning system
.
clacker sounds

.
inhibited while airborne.

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

Landing Gear Warning Cutout Switch

Landing Gear Warning Cutout Switch
Push – silences landing gear configuration warning aural indication at flaps up through 10 and above 200 feet RA.
Note:  The aural indication cannot be silenced with the cutout switch at flaps greater than 10.
Copyright . The Boeing Company. See title page for details.
15.10.4   April 28, 2000

Warning Systems -Controls and Indicators 737 Flight Crew Operations Manual
Altitude Alert

Selected Altitude Alert YA613 - YA809, YC411 - YK104
A white box shows around the selected altitude display between 900 feet and 300 feet before reaching the selected altitude.

Selected Altitude Alert YC153, YC154
A white box shows around the selected altitude display between 900 feet and 200 feet before reaching the selected altitude.

Current Altitude Alert YA613 - YA809, YC411 - YK104
The white box around the current altitude display becomes bold between 900 feet

and 300 feet before reaching the selected altitude.
The box turns amber and flashes for 300 feet to 900 feet deviation from the
selected altitude.

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

Current Altitude Alert
The white box around the current altitude display becomes bold between 900 feet and 200 feet before reaching the selected altitude.
　
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