On the Boeing 737, warning lights are part of the aircraft’s warning systems designed to alert the crew to various conditions that require attention.
List of warning lights
A • B • C • D • E • F • G • I • L • M • N • O • P • R • S • T • U • V • W • Y • Z
Reference Aircraft: Boeing 737-8 (Max)
A
- A/P
- A/T
- AFT – Cargo Fire and FIRE WARN
- AFT CARGO
- AFT ENTRY
- AFT SERVICE
- ALIGN and FAULT – IRS
- ALT DISAGREE
- ALTN – EEC
- ANTISKID INOP
- AOA DISAGREE
- APU BOTTLE DISCHARGED
- APU – Fire and FIRE WARN
- APU DET INOP
- AUTO BRAKE DISARM
- AUTO FAIL
- AUTO SLAT FAIL
- AUTO UNLK
- AUX PITOT
B
- BAT DISCHARGE
- BLEED TRIP OFF
- BRAKE TEMP
C
- CABIN ALTITUDE
- CAPT PITOT
- Cargo Fire Bottle Discharged
- CDS FAULT
- CONFIG (Airplanes with Center Tank Auto Shutoff)
- COWL ANTI-ICE
- COWL VALVE OPEN – Engine Anti-ice
D
- DC FAIL
- DETECTOR FAULT
- DISCH
- DISPLAYS CONTROL PANEL
- DRIVE
- DSPLY SOURCE
- DSPLY SOURCE
- DUAL BLEED
E
- ELEC
- ELT
- ENG 1 OVERHEAT
- ENG 2 OVERHEAT
- ENG FAIL (both)
- ENG FAIL (single)
- Engine 1 – Fire and FIRE WARN
- Engine 2 – Fire and FIRE WARN
- ENGINE CONTROL
- Engine Fire Bottle Discharged L/R
- EQUIP
F
- F/O PITOT
- FAULT – APU
- FAULT – Engine Fire/Overheat Detector
- FAULT – IRS
- FAULT and ALIGN – IRS
- FEEL DIFF PRESS
- FILTER BYPASS
- FIRE WARN and AFT – Cargo Fire
- FIRE WARN and APU – Fire
- FIRE WARN and Engine 1 – Fire
- FIRE WARN and Engine 2 – Fire
- FIRE WARN and FWD – Cargo Fire
- FIRE WARN and WHEEL WELL – Fire
- FMC – CDU Alerting
- FMC – FMC DISAGREE – VERTICAL
- FMC – FMC DISAGREE
- FMC – FMC FAIL (With Dual FMC Option)
- FMC and MSG – CDU Alerting
- FMC and MSG – FMC DISAGREE – VERTICAL
- FMC and MSG – FMC DISAGREE
- FMC DISAGREE – VERTICAL
- FMC DISAGREE
- FWD – Cargo Fire and FIRE WARN
- FWD CARGO
- FWD ENTRY
- FWD SERVICE
G
- GEN OFF BUS, SOURCE OFF and TRANSFER BUS OFF (both sides)
- GLS
- GPS
I
- IAS DISAGREE
- ILS
- IMBAL
- INOP – Ground Proximity
L
- L ALPHA VANE
- L BOTTLE DISCHARGED
- L ELEV PITOT
- L VALVE OPEN – Wing Anti-ice
- LE FLAPS TRANSIT
- LEFT AFT OVERWING
- LEFT FWD OVERWING
- LEFT GEAR
- LOCK FAIL
- LOW OIL PRESSURE – APU
- LOW OIL PRESSURE – Engine
- LOW PRESSURE – Flight Control
- LOW PRESSURE – Fuel Pump
- LOW PRESSURE – Hydraulic Pump – Standby
- LOW PRESSURE – Hydraulic Pump – System A (both)
- LOW PRESSURE – Hydraulic Pump – System A and B
- LOW PRESSURE – Hydraulic Pump – System B (both)
- LOW PRESSURE – Hydraulic Pump (single)
- LOW QUANTITY
- LOW
M
- MACH TRIM FAIL
- MSG and FMC – CDU Alerting
- MSG and FMC – FMC DISAGREE – VERTICAL
- MSG and FMC – FMC DISAGREE
N
- NO AUTOLAND
- NO LAND 3
- NOSE GEAR
- NOT ARMED
O
- OFF – Equipment Cooling
- OFF – Flight Recorder
- OFF SCHED DESCENT
- OIL FILTER BYPASS
- ON DC
- OVER SPEED – APU
- OVERHEAT – Hydraulic Pump
- OVERHEAT – Window
P
- PACK
- PASS OXY ON – Chemical oxygen
- PSEU
R
- R ALPHA VANE
- R BOTTLE DISCHARGED
- R ELEV PITOT
- R VALVE OPEN – Wing Anti-ice
- REV
- REVERSER
- RIGHT AFT OVERWING
- RIGHT FWD OVERWING
- RIGHT GEAR
S
- SOURCE OFF (both)
- SOURCE OFF (single)
- SOURCE OFF, TRANSFER BUS OFF and GEN OFF BUS (both sides)
- SPEED BRAKE DO NOT ARM – Without Load Alleviation System
- SPEED TRIM FAIL
- SPEEDBRAKES EXTENDED
- STAB OUT OF TRIM
- STANDBY PWR OFF
- START VALVE OPEN
- STBY RUD ON
T
- TAI
- TAKEOFF CONFIG
- TEMP PROBE
- TR UNIT
- TRANSFER BUS OFF
- TRANSFER BUS OFF, SOURCE OFF and GEN OFF (both sides)
U
- UNABLE REQD NAV PERF – RNP (FMC Update U10.6 and Earlier)
- UNABLE REQD NAV PERF – RNP (FMC Update U10.7 and Later)
V
- VALVE OPEN – Crossfeed
W
- WHEEL WELL – Fire and FIRE WARN
- WING-BODY OVERHEAT
Y
- YAW DAMPER
Z
- ZONE TEMP
