Warning Systems -System Description 737 Operations Manual

Generally, aurals automatically silence when the associated non–normal condition no longer exists.
Master Fire Warning Lights
Two master FIRE WARN lights illuminate when any fire warning condition occurs. The lights remain illuminated as long as the condition exists. Pushing either master FIRE WARN light or fire warning bell cutout switch extinguishes both lights, silences the fire warning bell and resets the system for future warnings. Further information appears in the Fire Protection chapter.
Master Caution Lights
Two MASTER CAUTION lights illuminate when any caution occurs outside the normal field of vision of the flight crew. The lights remain illuminated as long as the caution condition exists, or until the crew resets the system. Pushing either MASTER CAUTION light extinguishes both lights and resets the master caution system for further cautions. Pushing either annunciator light panel recalls all existing fault annunciations.
A single fault in certain redundant systems--or some simple faults--do not illuminate the MASTER CAUTION or system annunciator lights. These faults, however, are stored in the master caution system. Pushing the system annunciator recalls the single fault on the system annunciator panel.
When MASTER CAUTION recall is pressed, all twelve system lights should illuminate while the press-to-test feature is held. If a system annunciator light does not illuminate, refer to the dispatch deviation procedures guide (DDPG).
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15.20.2  December 3, 2004

Warning Systems -System Description

System Annunciator Lights
Two system annunciator light panels are located on the glare shield. The annunciator light panels include only those systems located on the forward overhead, aft overhead, and fire control panels. If a caution condition exists, the appropriate system annunciator(s) and MASTER CAUTION lights illuminate.
System Annunciators and Related Amber Lights – Left Side
FLT CONT LOW QUANTITY LOW PRESSURE FEEL DIFF PRESS SPEED TRIM FAIL MACH TRIM FAIL AUTO SLAT FAIL YAW DAMPER STBY RUD ON (as installed)  FLT CONT ELEC IRS APU FUEL OVHT/DET  ELEC LOW OIL PRESSURE HIGH OIL TEMP STANDBY PWR OFF TRANSFER BUS OFF BUS OFF 
IRS  APU 
FAULT  LEFT SIDE  LOW OIL PRESSURE 
ON DC  LIGHT SHIELD  HIGH OIL TEMP/ 
DC FAIL  FAULT OVERSPEED 
FUEL  OVHT/DET 
LOW PRESSURE  ENGINE 1 
FILTER BYPASS  OVERHEAT ENGINE 2 OVERHEAT APU DET INOP 

Copyright . The Boeing Company. See title page for details.
December 3, 2004  15.20.3
Warning Systems -System Description

System Annunciators and Related Amber Lights – Right Side
ANTI–ICE WINDOW OVERHEAT PITOT HEAT OFF COWL ANTI–ICE WINDOW HEAT OFF (as installed) 
 ENG REVERSER PMC-INOP LOW IDLE 
HYD  OVERHEAD 
OVERHEAT  ANTI–ICE ENG  EQUIP COOLING– 
LOW PRESSURE  RIGHT SIDE LIGHT SHIELD HYD OVERHEAD DOORS AIR COND  OFF EMER EXIT LIGHTS–NOT ARMED FLIGHT RECORDER–OFF PASS OXY–ON ELT ON (as installed) 
DOORS  AIR COND 
FWD/AFT ENTRY  DUCT OVERHEAT 
AIRSTAIR (as  DUAL BLEED 
installed)  PACK TRIP OFF 
EQUIP  WING–BODY 
FWD/AFT CARGO  OVERHEAT 
FWD/AFT SERVICE  BLEED TRIP OFF AUTO FAIL OFF SCHED DESCENT 

Warning Systems Takeoff Configuration Warning
The takeoff configuration warning is armed when the airplane is on the ground and either or both forward thrust levers are advanced for takeoff. An intermittent takeoff warning horn sounds if:
.
trailing edge flaps are not in the flaps 1 through 15 takeoff range, or

.
leading edge devices are not configured for takeoff, or

Copyright . The Boeing Company. See title page for details.
15.20.4  December 1, 2000

Warning Systems -System Description 737 Operations Manual
.
the SPEED BRAKE lever is not in the DOWN position, or
. on some airplanes, the parking brake is set, or

.
the stabilizer trim is not set in the takeoff range. The warning indication is cancelled when the configuration error is corrected.

Landing Gear Configuration Warnings
Visual indications and aural warnings of landing gear position are provided by the landing gear indicator lights and landing gear warning horn.
Visual Indications
The landing gear indication lights are activated by signals from each gear, the
LANDING GEAR lever, and the forward thrust lever position as follows:
　
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