Green lights indicate a fully extended configuration, e.g., landing gear and leading
edge devices.
For specific information regarding red, amber, blue, and green lights refer to the
appropriate systems chapters.
Stall warning is provided by a control column shaker on each control column.
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Warning Systems -System Description
737 Flight Crew Operations Manual
Various aural signals call attention to warnings and cautions. An aural warning for airspeed limits is given by a clacker, the autopilot disconnect by a warning tone, cabin altitude by an intermittent horn, and landing gear positions by a steady horn. The takeoff configuration is given by an intermittent horn, and the fire warning by a fire warning bell. Ground proximity warnings and alerts, and windshear warnings and alerts are given by voice warnings.
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 the 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 September 27, 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 ELEC
LOW QUANTITY DRIVE
LOW PRESSURE STANDBY PWR OFF
FEEL DIFF PRESS TRANSFER BUS OFF
SPEED TRIM FAIL SOURCE OFF
MACH TRIM FAIL TR UNIT
AUTO SLAT FAIL FLT CONT ELEC BATTERY DISCHARGE
YAW DAMPER IRS APU ELEC
YD651 - YK104 FUEL OVHT/DET
STBY RUD ON LEFT SIDE GLARESHIELD
IRS APU
FAULT ON DC DC FAIL GPS LOW OIL PRESSURE FAULT OVERSPEED
FUEL OVHT/DET
LOW PRESSURE FILTER BYPASS ENGINE 1 OVERHEAT ENGINE 2 OVERHEAT APU DET INOP
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March 28, 2005 15.20.3
Warning Systems -System Description 737 Flight Crew Operations Manual
System Annunciators and Related Amber Lights – Right Side
YA613 - YA809
ANTI–ICE ENG
WINDOW REVERSER
OVERHEAT EEC ALTN MODE
PITOT HEAT ENGINE CONTROL
COWL ANTI–ICE
HYD OVERHEAD
OVERHEAT EQUIP COOLING– OFF
LOW PRESSURE RIGHT SIDE GLARESHIELD ANTI-ICE ENG HYD OVERHEAD DOORS AIR COND EMER EXIT LIGHTS–NOT ARMED FLIGHT RECORDER–OFF PASS OXY–ON PSEU
DOORS AIR COND
FWD/AFT ENTRY DUAL BLEED
EQUIP WING–BODY
FWD/AFT CARGO OVERHEAT
FWD/AFT SERVICE BLEED TRIP OFF
LEFT/RIGHT AUTO FAIL
OVERWING OFF SCHED DESCENT DUCT OVERHEAT PACK TRIP OFF
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