ENGINE START PANEL Flashcards
1
Q
ENGINE START Switch
- 4 positions / 2 switches -
GRD
OFF
CONT
FLT
A
GRD: (operated on the ground AND in flight)
- solenoid held - spring loaded to OFF
- Opens Start Valve [START VALVE OPEN] comes on
- Closes ENG Bleed Valve
-
for GROUND starts:
- Arms selected igniters to provide ignition when eng start lever moved to IDLE
-
for INFLIGHT starts:
- Arms BOTH igniters to provide ignition when eng start lever moved to IDLE
- releases to OFF at START VALVE cutout (56% N2)
OFF:
- ignition normally off
- Both igniters activated when engine start lever is in IDLE and
- uncommanded rapid decrease in N2 occurs - OR -
- N2 is between 57-50% - OR -
- Inflight and N2 is between IDLE and 5%
CONT:
- provides ignition to selected igniter when engine is operating AND eng START LEVER is in IDLE
- INFLIGHT (only): provides ignition to BOTH ignitors when N2 is below idle and START LEVER is in IDLE
-
Normal Uses:
- Takeoff and Landing
- Emergency Descent
- Eng Anti-Ice
- Moderate to Heavy Rain, Hail or Sleet
- Inflight engine start if N2 < 8%
FLT:
- provides ignition through BOTH igniters when the Start Lever is in IDLE
- bypasses the Ignition Select Switch
-
Normal Uses:
- Inflight Windmill Start
- High Engine Vibration
- Fan Ice removal
- Severe Turbulance
- Loss of Thrust on Both Engines
- Volcanic Ash
2
Q
IGNITION SELECT Switch
A
IGN L: selects left ignitor for use on BOTH engines
BOTH: selects BOTH ignitors for use on BOTH engines
IGN R: selects RIGHT ignitor for use on BOTH engines (Standby AC Bus)
3
Q
1SP questions on the Start Switches.
- What are we doing by putting the start switch in the ground position?
- What is the difference between ground and continuous?
- What is the difference between continous and flight?
- What is the power source of the right ignitor?
- Why is this so important (the above source?)
A
- the only thing we are doing is opening the start valve.
- in ground you will open the start valve, in continuous you bypass the start valve
- in CONT you will have continuous ignition depending on which ignitor you select (L/R/Both) in FLT you are going to get both ignitors regardless of the position of the ignition switch
- AC Standby bus. (right) The left is powered by the respective transfer bus.
- because you are checking the AC standby bus so that incase inflight you lose both generators the only ignitor you are going to have is the right ignitor.