Warning Systems

Warning lights, annunciators, aural and tactile warning devices that advise of a hazardous or potentially hazardous situation:


  • Engine Fire        
  • APU Fire
  • Wheel Well Fire
  • Main Deck Cargo Compartment Fire
  • Lower Cargo Compartment Fire
  • Impending Stall
  • Unsafe Takeoff Configuration
  • Excessive Operating Airspeed
  • Autopilot Disengagement
  • Autothrottle Disengagement
  • Excessive Altitude Difference
  • Radio Altimeter, ADI or HSI Flags
  • Insufficient RPM to provide Nacelle Anti Ice
  • Reaching Decision Height
  • Landing Gear Door Open
  • Landing Gear Not Down and Locked #1
  • Landing Gear Not Down and Locked #2
  • Excessive Cabin altitude
  • INS on Battery Power
  • Loss of Equipment Cooling
  • Ground Proximity










791 lights and switches on the Classics, compared to 365 on the -400.




Red master FIRE warning lights on pilot's lightshield (Captain's side shown):



Engine Fire:
Bell in cockpit
Both red master FIRE warning lights on pilot's lightshield illuminate.
Respective engine fire switch on pilot's overhead panel illuminates.


Pushing either of the master FIRE warning lights or the fire bell reset switch to silence the
fire warning bell, extinguish the master FIRE warning lghts and reset the warning circuits.


APU Fire:
Bell in Cockpit & Horn in Wheel Well
Both red master FIRE warning lights on pilot's lightshield illuminate.
Red APU light on pilot's overhead panel illuminates.
APU Fire switch onb F/E's panel illuminates.
APU remote fire light in wheel well illuminates.








Wheel Well Fire:
Both red master FIRE warning lights on pilot's lightshield illuminate.
Red WHEEL WELL light on pilot's overhead panel illuminates.






Main Deck Cargo Compartment Fire:
Both red master FIRE warning lights on pilot's lightshield illuminate.
Red CARGO light on pilot's overhead panel illuminates.
Appropriate red numerical smoke detector light on F/Es panel illuminates.


Lower Cargo Compartment Fire:
Both red master FIRE warning lights on pilot's lightshield illuminate.
Red CARGO light on pilot's overhead panel illuminates.
Red FWD or AFT light on F/Es panel illuminates.




Impending Stall:

Control column shakes




Unsafe Takeoff Configuration:
Intermittent horn in cockpit
Horn sounds if #3 thrust lever is advanced beond takeoff warning horn range and:
  1. Stabilizer not in green band
  2. Flaps not at 10 or 20
  3. Speed brake lever not in down detent
  4. Body gear steering not centred
  5. Leading edge flaps not extended.



Excessive Operating Airspeed:
Clacker sounds in cockpit


Autopilot Disengagement:
Wailer sounds in cockpit
Autopilot warning lights flash red


Autothrottle Disengagement:
Autothrottle warning lights flash red.
(See panel above)


Excessive Altitude Differences:
Buzzer sounds in cockpit (if installed)
Instrument WARN lights flash red.
ATT lights illuminate stead amber.



Radio Altimeter, ADI or HSI Flags:
Instrument WARN lights on affected side flashes red
(See panel above)



Insufficient RPM to provide Nacelle Anti Ice:
Amber LOW N1 light (as installed) on pilot's annunciator module fashes.




Reaching Decision Height:
DH light (amber) illuminates





Landing Gear Door Open:
Landing gear DOOR OPEN light (red) on pilot's centre panel illuminates



DOOR OPEN light (amber) on F/Es panel will illuminate for affected door when DOOR PRIM and DOOR ALT switches depressed:




Landing Gear Not Down and Locked #1 (Light):
Red GEAR light on pilot's centre panel illuminates.
Lights on when:
  1. Landing gear is not in agreement with landing gear lever
  2. Landing gear lever is not in DN detent with gear down and locked
  3. Any thrust lever is retarded to idle and landing gear is not down and locked.


Landing Gear Not Down and Locked #2 (Horn):
Steady horn in cockpit
Red GEAR light on pilot's centre panel illuminates.
Horn sounds when:
Landing gear is not down & locked and any thrust lever is retarded to idle with flaps 1, 5, 10 or 20, horn can be silenced on control stand
Landing gear is not down & locked with landing flaps and thrust lever in any position; horn can be silenced by pulling aural warning circuit breaker on P6 panel.


Excessive Cabin altitude:
Intermittent horn in cockpit when cabin altitude exceeds 10,000 Feet
Amber AUTO FAIL light on F/E panel illuminates
AUTO FAIL light will illuminate only on excessive rate of cabin pressure change.



INS on Battery Power:
Horn in nose wheel well sounds if condition exists for 30 seconds with airplane on the ground.





Loss of Equipment Cooling:
Horn in nose wheel sounds with airplane on the ground.
NO AIR FLOW light on F/E panel illuminates.




Ground Proximity:

Voice warning via cockpit speakers and pilot's headsets
Red ground proximity warning light on pilot's light shield panel illuminates
Activated under the following conditions:
  • Excessive sink rate
  • Excessive terrain closure rate
  • Descent after takeoff
  • Terrain clearance too low and not in landing configuration


Voice warning via
cockpit speakers and pilot's headsets
Amber BELOW G/S light on pilot's light shield panel illuminates
  • Excessive deviation below glide slope.






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