Master Warnings Flashcards
L FUEL PRES LO R FUEL PRES LO Trigger? Possible Causes? Drill?
Trigger: Pressure Sensed in the Collector Tank fuel line is <11PSI
Cause: Failure of Engine Driven low pressure fuel pump
Drill: Standby Pump (Affected side)………………..ON
Go to Checklist
Note: Engine driven low pressure pump is installed on the same drive shaft the 2 external oil scavenger pumps. Monitor oil temp/pressure after illumination of this annuciator
CABIN ALT HI
Possible Causes: Cabin Altitude exceeds 10,000ft
Drill:
- Oxygen………………………………..Confirm on
- Oxygen mask……………PULL LANYARD PIN, DON MASK
Go to checklist
CABIN DIFF HI
Trigger: Cabin differential pressure sensed at > 5.25 ± 0.15 PSI
Possible cause: Cabin differential pressure high
Drill:
- Bleed air valves……………………………ENVIR OFF
Go to checklist
L OIL PRES LO R OIL PRES LO
Trigger: Oil pressure sensed at < 60 PSI
Possible cause: Oil pressure failure
Drill:
- Oil pressure gage…………………………check pressure
- If Below 60 PSI…………………………Secure engine or land at nearest suitable airport using the minimum power required
Note: The L/R OIL PRES LO annunciators and oil pressure gauge receive their data from separate sensors; both should to be used to confirm a problem.
L ENVIRO FAIL R ENVIRO FAIL
Trigger: Disagreement between switch position and valve position or valve is not powered
Possible cause: Environment air duct over pressure (Activates at > 44 ± 1 PSI) and/or over temperature (Activates at > 500 ˚F (260C) ± 10˚F)
Note: Nominal air duct pressure of 38 PSI and temperature of 450˚F(232C) ± 25˚F. Both annunciators also illuminate as part of the T-Test system check. Note: The L ENVIRO FAIL annunciator will illuminate whenever the left generator bus is unpowered.
CABIN DOOR
Trigger: Any of the 5 internal microswitches is indicating that the door is NOT secure.
Possible cause: Cabin door open or not secure
- All occupants…………………………………………..Seated with seatbelts fastened
Go to checklist
Note: The 5 microswitches are: 2x cam lock latches, 1x doorsill, 2x handle latches
CARGO DOOR
Trigger: Any of the 5 internal microswitches is indicating that the door is NOT secure.
Possible cause: Cargo door open or not secure
Drill:
- All occupants…………………………………………..Seated with seatbelts fastened
Go to checklist
Note: The 5 microswitches are: 2x cam lock latches, 1x doorsill, 1x handle latch, 1x latch pin
L BL AIR FAIL R BL AIR FAIL
Trigger: 18 PSI not sensed
Possible cause: Melted or failed bleed air failure warning line or system off
- Bleed air valve……………………………INST & ENVIR OFF
Go to checklist
Note: Nominal pressure in warning line (EVA tubing) is 17.5 – 19.0 PSI. Both annunciators also illuminate if both ENVIRO switches are placed in the INST & ENVIRO OFF position.
L AC BUS R AC BUS
Trigger: The 115v AC Bus is unpowered
Possible cause: AC Bus has an inoperative inverter or either 115v bus or 26v bus has a short
Drill:
- Inverter switch……………………………select opposite
Go to checklist
Note: When the L/R 115v AC Bus is unpowered the same side 26v AC Bus is unpowered. Either annunciator will also illuminate when the respective AC Bus switch is turned off.
A/P TRIM FAIL (If Autopilot Installed)
Trigger: Autopilot trim servo has reached its maximum operational limit
Possible cause: Improper trim or no trim from autopilot trim command
- Airplane attitude……………………….MAINTAIN USING ELEVATOR CONTROL
- Disconnect trim using control wheel switch
Go to checklist
Note: Pilot flying should hold yoke with both hands for autopilot disconnect as force required to maintain the aircraft’s attitude may be higher than normal.
A/P DISC (If Autopilot Installed)
Trigger: Autopilot data computer failure
Possible cause: Autopilot is disconnected by means other than pilot’s switch
Note: Crew may re-engage autopilot after selecting the opposite computer. However, the pilot flying must be on the same side as the autopilot data computer being used.
