Lights & Switches 2018 Flashcards
Walk me through a normal engine start
What happens and when?
ENG 1 2 switch ON Begins automatic start sequence:
-Opens LP fuel valve
-Opens start valve & increases APU air (if APU being used)
-Energizes ignition (alternates between igniters each start)
-when N2 > 16% on the ground
-immediately in flight
-HP fuel valve opens
-when N2 > 22% on the ground
-when N2 > 15% in flight
-@ N2 > 50%
-start valve is closed
-Ignition is de-energized
-APU speed is returned to normal (if being used)
-Pack valves are re-opened after 30 second delay (unless other engine is
started)
During manual start sequence ( if ENG MAN START pb On)
-Energizes both igniters
-Opens LP and HP fuel valve
-@ N2 > 50%
-Start valve is closed
-Ignition is de-energized (if on the ground)
-APU speed is returned to normal (if APU being used)
What happens when you test the engine fire PB?
SQUIB & DICH illuminate ENGINE FIRE PB illuminate CRC MASTER WARNING ECAM engine page FIRE switches
What happens when you test the APU fire system
On DC power:
- SQUIB & DICH illuminate
- Half APU fire PB illuminate
On AC power:
- CRC
- SQUIB & DISCH illuminate
- APU Fire PB illuminate
- MASTER WARNING
- APU ECAM PAGE
What happens when you push the APU Fire PB?
- Silences the CRC
- Arms the SQUIB
- Closes APU bleed
- closes APU fuel valve
- turns off APU fuel pump
- deactivates APU gen
- closes crossbleed valve
What happens when you push the ENGINE FIRE PB?
- silences CRC
- arms the SQUIB
- closes hydraulic shutoff valve
- closes pack control flow valves
- closes LP fuel valve
- de-energizes FADEC
- closes bleed valve
How do you know you’re in Normal law?
Green equal signs on PFD
How do you know you’re in alternate law?
Amber x’s on PFD
How do you know you’re in direct law?
MAN PITCH TRIM illuminated on PFD
How do you know you’re in MECHANICAL BACKUP?
MAN PITCH TRIM ONLY on PFD
What is the bus tie priority system?
Engine driven generators
External power
APU
