Master Warning System




 
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The following page shows in tabular form the situations leading to the illumination of the different annunciator panel lights.

It is imperative for effective flight operations that each pilot FULLY understand all of these situations for effective fault diagnoses and correct emergency checklist application if required.

Page 7-6 and page 7-7 of the Aircraft Flight Manual contains a list of all light illumination causes and should be referred to regularly until a thorough understanding of these lights is accomplished.

The importance of this section cannot be stressed highly enough.

L FUEL COMP OFF 1. The Left Fuel Computer switch is off.
2. The Left Fuel Computer was de-energised by the Fuel Computer Monitor circuit.
L GEN OFF 1. Above 60% RPM indicates that the Left Generator switch is off.
2. Above 60% RPM, the Left Generator has malfunctioned.

This light will trigger the Master warning lights when combined with the R GEN OFF light.

L FUEL SHUTOFF The Left engine fuel flow has been terminated at the firewall.
L FUEL PRESS LOW 1. The Left Main or Auxillary boost pump has failed.
2. The Left Main or Auxillary boost pump has been switched off.
3. Will illuminate momentarily when switching from one boost pump to another.
L AUX BOOST ON 1. The Left Fuel Aux. boost pump is in operation.
2. Illumination is normal with L FUEL BOOST switch positioned to AUX, or, during fuel crossfeed from left tank to right engine.
3. Illuminates when left MAIN BOOST pump fails due to automatic AUX BOOST pump operation when MAIN BOOST pump fails.
L NTS CHECK 1. Illuminates during the NTS CHECK procedure.
It does not indicate in flight NTS operation
HYD PRESS ON 1. Illuminates when hydraulic pressure is being applied to either the wing flap system or the landing gear system.
L HYD FLOW LOW 1. Indicates that insufficient flow exists for normal hydraulic system operation from the left hydraulic pump.
L ENGINE ANTI-ICE 1. Illuminates when the engine inlet bleed air valve is open when the L ENGINE ANTI-ICE switch is turned on.
Operation can be verified by observing EGT guage.
L X-FER PUMP FAIL 1. Indicates failure of the forward and/or aft transfer ejector pumps used for maintaining fuel in the hopper tank.
2. Illuminates when there is less than 80 lbs fuel in left tank with either MAIN or AUX boost pumps in operation.
3. Illuminates when there is less than 580 lbs fuel in left tank with both the MAIN and AUX boost pumps off or failed.
L FUEL LEVEL LOW Illuminates when there is between 150-250 lbs fuel in the left fuel tank.
L BETA Indicates that the left propeller is capable of being reversed. Illumination is normal during ground operations.
DOOR NOT LOCKED 1. The main cabin door is not properly secured for flight.
This light will trigger the Master warning lights
AIR DUCT OVERHEAT 1. Indicates that the air in the cabin distribution duct is above 157° C.
W/S AIR OVERHEAT 1. Indicates that duct temperature for windshield bleed air is above 157° C.
This light will trigger the Master warning lights
L WING OVERHEAT 1. Indicates that the L/H inboard wing leading edge temperature is above 149° C. Bleed air supply from the left engine will automatically be terminated.

This light should extinguish automatically within 2 minutes once the wing temperature has decreased below 149° C, if not check correct bleed air shutoff has occurred.

This light will trigger the Master warning lights

BATT 1 OVERHEAT (N/A on CORPAIR a/c due modification) 1. No illumination indicates that battery #1 (the forward battery) temperature is less than 63° C.
2. Steady illumination indicates that battery #1 temperature is between 63° C and 71° C.
3. Flashing illumination indicates that battery #1 temperature is above 71° C, or, the PRESS TO TEST button has been pushed. This light will trigger the Master warning lights
L OIL PRESS 1. Indicates that left engine oil pressure is less than 40 PSI.
This light will trigger the Master warning lights
L-BOT ARMED 1. The left engine fire extinguisher bottle has been electrically armed and is capable of being fired.
2. Pressing the button discharges the contents of the bottle.
LH FIRE F/W SHUTOFF 1. Indicates that engine compartment temperature has exceeded normal operating temperatures. 2. Pressing this button will:
  • Close the left fuel firewall shutoff valve,
  • Close the left bleed air shutoff valve,
  • Disable the left generator and,
  • Arm the left engine fire extinguisher bottle.

The light will extinguish once the engine compartment has cooled to normal temperatures. This light will trigger the Master warning lights

RH FIRE F/W SHUTOFF 1. As described above but for the right engine. This light will trigger the Master warning lights
R NTS CHECK 1. Illuminates during the NTS CHECK procedure.
It does not indicate in flight NTS operation.
R AUX BOOST ON 1. The right fuel Aux. boost pump is in operation.
2. Illumination is normal with R FUEL BOOST switch positioned to AUX, or, during fuel crossfeed from right tank to left engine.
3. Illuminates when right MAIN BOOST pump fails due to automatic AUX BOOST pump operation when MAIN BOOST pump fails.
R FUEL PRESS LOW 1. The right Main or Auxillary boost pump has failed.
2. The right Main or Auxillary boost pump has been switched off.
3. Will illuminate momentarily when switching from one boost pump to another.
R FUEL SHUTOFF 1. The right engine fuel flow has been terminated at the firewall.
R GEN OFF 1. Above 60% RPM indicates that the right Generator switch is off.
2. Above 60% RPM, the right Generator has malfunctioned. This will trigger the Master warning lights when combined with the L GEN OFF light.
R FUEL COMP OFF 1. The right Fuel Computer switch is off.
2. The right Fuel Computer was de-energised by the Fuel Computer Monitor circuit.
R BETA 1. Indicates that the right propeller is capable of being reversed. Illumination is normal during ground operations.
R FUEL LEVEL LOW 1. Illuminates when there is between 150-250 lbs fuel in the right fuel tank.
R X-FER PUMP FAIL 1. Indicates failure of the forward and/or aft transfer ejector pumps used for maintaining fuel in the hopper tank.
2. Illuminates when there is less than 80 lbs fuel in right tank with either MAIN or AUX boost pumps in operation.
3. Illuminates when there is less than 580 lbs fuel in right tank with both the MAIN and AUX boost pumps off or failed.
R ENGINE ANTI-ICE 1. Illuminates when the engine inlet bleed air valve is open when the R ENGINE ANTI-ICE switch is turned on.
Operation can be verified by observing EGT guage.
R HYD FLOW LOW 1. Indicates that insufficient flow exists for normal hydraulic system operation from the right hydraulic pump.
BLEED AIR GROUND 1. Indicates that the pressurisation source selector is selected to GND.
R OIL PRESS 1. Indicates that right engine oil pressure is less than 40 PSI.
This light will trigger the Master warning lights
BATT 2 OVERHEAT (N/A on CORPAIR a/c due modification) 1. No illumination indicates that battery #2 (the rear battery) temperature is less than 63° C.
2. Steady illumination indicates that battery #2 temperature is between 63° C and 71° C.
3. Flashing illumination indicates that battery #21 temperature is above 71° C, or, the PRESS TO TEST button has been pushed. This light will trigger the Master warning lights
R WING OVERHEAT 1. Indicates that the R/H inboard wing leading edge temperature is above 149° C. Bleed air supply from the right engine will automatically be terminated.
2. This light should extinguish automatically within 2 minutes once the wing temperature has decreased below 149° C, if not check correct bleed air shutoff has occurred. This light will trigger the Master warning lights
CABIN ALTITUDE 1. Illuminates when the cabin altitude is above 10,900 ft (A/C without SK441-36).
2. Illuminates when the cabin altitude is above 11,500 ft (A/C fitted with SK441-36).
This light will trigger the Master warning lights
EMER PRESS ON 1. Indicates that emergency pressurisation was automatically selected due to an air cycle machine over heat.
This light will trigger the Master warning lights
SURFACE DE-ICE 1. Illuminates when the de-ice boots on the tail and the wings have reached the correct operating pressure.

This light will cycle on and off twice when the DE-ICE BOOTS switch is activated (once for the tail surface boots and once for the wing surface boots).

 
Illumination Causes


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