Warning Lights Flashcards
Cabin Press
red
PROBABLE CAUSE
Cabin altitude exceeds 10,000 ft.
IMMEDIATE ACTION
Check FAULT light on CABIN ALTITUDE panel for illumination. If illuminated, select pressurization mode selector switch to MAN and AIR CONDITIONING BLEED selector to MAX. Regulate cabin altitude by manipulation of MAN knob on CABIN ALTITUDE panel.
REMARKS
If FAULT light is not illuminated, select AIR CONDITIONING BLEED selector to MAX and see the QRH for inflight depressurization procedure. CABIN PRESS caution light goes out when cabin pressure goes below 10,000 ft.
FLT COMPT DUCT HOT
amber
PROBABLE CAUSE
Flight compartment supply duct temperature exceeds 88 degrees C.
IMMEDIATE ACTION
If caution light repeatedly illuminates and goes out, adjust FLT COMP TEMP CONTROL to a lower setting. If cycling continues, bleed switch off.
REMARKS
Normal operation automatically interrupted and full cool air is routed through ducts until duct temperature is 82 degrees C. Caution light goes out and normal operation resumes.
CABIN DUCT HOT
amber
PROBABLE CAUSE
Cabin supply duct temperature exceeds 88 degrees C.
IMMEDIATE ACTION
If caution light repeatedly illuminates and goes out adjust CABIN TEMP CONTROL to a lower setting. If cycling continues, bleed switch off.
REMARKS
Normal operation is automatically interrupted and full cool air is routed through ducts until duct temperature is 82 degrees C. Caution light goes out and normal operation resumes.
AIR COND PACK HOT
amber
PROBABLE CAUSE
Air cycle machine (ACM) compressor discharge temperature exceeds 207 degrees C.
IMMEDIATE ACTION
Gradual depressurization will occur while bleed is shut down. If caution light repeatedly illuminates and goes out, reduce ACM cooling demand by adjusting CABIN temperature control and FLT COMP temperature control to higher setting. If cycling continues bleed switch off.
REMARKS
Normal operation is automatically interrupted and both bleed air sub-systems are shut down until air cycle machine cools. Caution light goes out and normal operation resumes.
PRI INV
amber
PROBABLE CAUSE
Primary inverter inoperative.
IMMEDIATE ACTION
Check left essential dc circuit breaker panel PRIM INV PWR and PRIM INV CONT circuit breakers (F8, G8). Primary inverter switch - OFF.
REMARKS
With only one inverter operational (two inverters inoperative), power is maintained to all fixed frequency buses via bus tie circuit breaker. Shed loads where possible to minimize load on remaining inverter.
AUX INV
amber
PROBABLE CAUSE
Auxiliary inverter inoperative.
IMMEDIATE ACTION
Check left main dc circuit breaker panel AUX INV CONT circuit breakers (D8, E8). Auxiliary inverter switch OFF.
REMARKS
With failure of primary or secondary inverter, auxiliary inverter automatically switches to failed side, regardless of AUX INV switch position.
L 26 AC
amber
PROBABLE CAUSE
Left 26 volt fixed frequency transformer inoperative.
IMMEDIATE ACTION
Check avionics circuit breaker panel L26V FAIL circuit breaker (P1). Auxiliary inverter select to operating side.
REMARKS
None.
R 26 AC
amber
PROBABLE CAUSE
Right 26 volt fixed frequency transformer inoperative.
IMMEDIATE ACTION
Check avionics circuit breaker panel R 26 V FAIL circuit breaker (P2). Auxiliary inverter select to operating side.
REMARKS
None.
L AC BUS
amber
PROBABLE CAUSE
Left ac variable frequency bus not powered.
IMMEDIATE ACTION
None.
REMARKS
If an ac generator fails, left and right ac variable frequency buses automatically tie.
R AC BUS
amber
PROBABLE CAUSE
Right ac variable frequency bus not powered.
IMMEDIATE ACTION
None.
REMARKS
None.
DC BUS
amber
PROBABLE CAUSE
Dc bus fault detected.
IMMEDIATE ACTION
None.
REMARKS
Bus Bar protection unit inhibits buses from tying, then after 7 seconds delay isolates and shuts down the affected dc generator and removes affected battery from faulty main bus. All services on affected left or right main dc buses are affected.
L TRU
amber
PROBABLE CAUSE
Left TRU inoperative.
IMMEDIATE ACTION
Check L TRU circuit breaker on 115 V AC VARIABLE FREQUENCY circuit breaker panel.
REMARKS
Secondary dc buses tie in the event of a TRU failure. If DC bus caution light illuminates, no reset of the bus fault reset switch should be attempted.
R TRU
amber
PROBABLE CAUSE
Right TRU inoperative.
IMMEDIATE ACTION
Check R TRU circuit breaker on 115 V AC VARIABLE FREQUENCY circuit breaker panel.
REMARKS
If a double TRU failure occurs secondary dc buses tie to main dc buses.
MAIN BATTERY
amber
PROBABLE CAUSE
Main battery is isolated from main bus.
IMMEDIATE ACTION
Cycle MAIN BATT switch on DC CONTROL panel OFF then ON. If caution light remains ON, MAIN BATT - OFF.
REMARKS
Main battery is removed from main bus automatically if a right main bus fault occurs or if external dc power is connected.
AUX BATTERY
amber
PROBABLE CAUSE
Auxiliary battery is isolated from main bus.
IMMEDIATE ACTION
Cycle AUX BATT switch on the DC CONTROL panel OFF then ON. If caution light remains on, AUX BATT - OFF.
REMARKS
Auxiliary battery is removed from the main bus automatically if a left main bus fault occurs or if external dc power is connected.
#1 DC GEN amber
PROBABLE CAUSE
No. 1 dc generator off-line or failed.
IMMEDIATE ACTION
A generator reset attempt may be made by selecting DC CONTROL GEN 1 switch off then on.
REMARKS
Main dc buses automatically tie.
#2 DC GEN amber
PROBABLE CAUSE
No. 2 dc generator off-lined or failed.
IMMEDIATE ACTION
A generator reset attempt may be made by selecting DC CONTROL GEN 2 switch off then on.
REMARKS
Main DC buses automatically tie.
#1 AC GEN amber
PROBABLE CAUSE
No. 1 AC generator off-line or failed.
IMMEDIATE ACTION
A generator reset attempt may be made by selecting AC CONTROL GEN 1 switch off then on again.
REMARKS
Variable frequency buses automatically tie.
2 AC GEN
PROBABLE CAUSE
No. 2 AC generator off-line or failed.
IMMEDIATE ACTION
A generator reset attempt may be made by selecting AC CONTROL GEN 2 switch off then on.
REMARKS
Variable frequency buses automatically tie.
MAIN BAT HOT
red
PROBABLE CAUSE
Main battery temperature exceeds 65 degrees C.
IMMEDIATE ACTION
Confirm battery overheat on temperature monitor. Select MAIN BATT switch OFF to isolate main battery from charging system.
REMARKS
None.
AUX BAT HOT
red
PROBABLE CAUSE
Auxiliary battery temperature exceeds 65 degrees C.
IMMEDIATE ACTION
Confirm battery overheat on temperature monitor. Select AUX BATT switch to OFF to isolate auxiliary battery from charging system.
REMARKS
None.
L TRU HOT
amber
PROBABLE CAUSE
Left transformer/rectifier unit overheated.
IMMEDIATE ACTION
Left TRU must be shut down by pulling L TRU circuit breaker on 115 V AC VARIABLE FREQUENCY panel.
REMARKS
Left and right secondary buses automatically tie when left TRU is shut down. Left TRU may be re-energized when it has cooled and caution light goes out.
R TRU HOT
amber
PROBABLE CAUSE
Right transformer/rectifier unit overheated.
IMMEDIATE ACTION
Right TRU must be shut down by pulling R TRU circuit breaker on 115 V AC VARIABLE FREQUENCY panel.
REMARKS
Left and right secondary buses automatically tie when right TRU is shut down. Right TRU may be re-energized when cooled and caution light goes out.
#1 DC HOT amber
PROBABLE CAUSE
No. 1 dc generator windings overheating.
IMMEDIATE ACTION
Shut down No. 1 dc generator.
REMARKS
Caution light will go out when generator cools. Reselect generator and reduce dc electrical load.
#2 DC HOT amber
PROBABLE CAUSE
No. 2 dc generator windings overheating.
IMMEDIATE ACTION
Shut down No. 2 dc generator.
REMARKS
Caution light will go out when generator cools. Reselect generator and reduce dc electrical load.
#1 AC HOT amber
PROBABLE CAUSE
No. 1 ac generator windings overheating.
IMMEDIATE ACTION
Shut down No. 1 ac generator.
REMARKS
Caution light will go out when generator cools. Reselect generator and reduce ac electrical load.
#2 AC HOT amber
PROBABLE CAUSE
No. 2 ac generator windings overheating.
IMMEDIATE ACTION
Shut down No. 2 ac generator.
REMARKS
Caution light will go out when generator cools. Reselect generator and reduce ac electrical load.
PASS DOOR
red
PROBABLE CAUSE
Passenger entry door not properly secured.
IMMEDIATE ACTION
Secure door if aircraft on ground. If in flight and depressurization is necessary see the QRH for inflight depressurization.
REMARKS
Warn all personnel to remain clear of door. PASS DOOR caution light goes out when door is closed securely.
BAG DOOR
red
PROBABLE CAUSE
Baggage door not properly closed.
IMMEDIATE ACTION
Secure door if aircraft on ground. If in flight and depressurization is necessary see the QRH for inflight depressurization procedure.
REMARKS
Warn all personnel to remain clear of door. BAG DOOR caution light goes out when door is closed securely.
CHECK FIRE DET
red
PROBABLE CAUSE
Engine fire detected or detector loop circuit malfunction.
IMMEDIATE ACTION
Check fire protection panel for illuminated PULL FUEL OFF handle and glareshield for flashing ENGINE FIRE light. If those indications are present proceed with the QRH engine fire procedure.
REMARKS
If fire warnings are not present and a FAULT light is illuminated select appropriate loop arming selector to remaining detector loop.