ATA 74 - Enginge Ignition Flashcards
1
Q
How many ignitor plugs are installed in each engine and where?
A
Two.
Installed 4 & 8 o’clock on the diffures and midframe casing assembly.
2
Q
How is the power supplied to the ignitors?
A
From the Exciter Unit that get its power from the PMA (Permanent Magnet Alternator).
3
Q
When will the L and R IGN switches control the ignition?
A
- Engine starts
- (Engine motoring)
- Icing conditions in flight
4
Q
Where are the ignition relays located?
A
In the nacelle
5
Q
When will the automatic ignition system initiate?
A
If/when the P3 pressure drops below 70 psi (this indicates a flame-out)
340A: This is initiated by the 70psi pressure switch
340B: This is initiated by the DECU
6
Q
What’s the open circuit peak voltage of the exciter?
A
5000-7500 Volts
