Engine Flashcards
How is the FADEC normally powered?
Above approximately 50% N2 the FADEC is powered by the Permanent Magnet Alternator (PMA). Below this value or in case the PMA becomes inoperative; the airplane’s electrical system provides the backup power. (B12 14-06-30 Pg 2)
DCC ESS BUS 1 + 2 provide backup power to FADEC (B1214-05-35 Pg 9 & 13)
On take-off, what indications will show that A TTCS has engaged?
A GREEN ATTCS indication is displayed to indicate the Automatic Takeoff Thrust Control System has engaged on the EICAS. The engagement only happens when the thrust levers reach the TO/GA set position.
(B12 14-06-05 Pg 5 & 7 and 14-06-30 Pg 2)
What does the cyan V bug indicate on the N1 gauge?
N1 Target Indication -A cyan V-shaped bug represents the N1 target on the dial indicator. (B12 14-06-05 Pg 5 & 6)
When does the ITT red line change to amber?
The red line will change to amber after the end of the takeoff phase. The red line will be shown in flight if the ITT goes above the CON thrust rating limit. (B12 14-06-05 Pg 5 & 8)
In certain conditions, a CYAN line will appear on the edge of the N1 indicator. Why and what for?
N1 WING ANTI-ICE CYAN LINE
Displayed only in icing conditions during final approach (radio altimeter below 1200 ft) with landing gear down or flaps extended. Indicates the minimum thrust level (N1 value) to meet bleed requirements.
(B12 14-06-05 Pg 5 & 6)
During an auto relight in flight, what indications would you expect to see next to the N2 indication?
A green WML icon is displayed whenever the FADEC has detected an engine flameout and the auto re-light system is actuating to restart the engine. (B12 14-06-05 Pg 5 & 8)
During ground starts, what protection does the FADEC provide?
The FADEC provides engine start protection on the ground as follows:
- Hung start .
- Hot start .
- No light-off
(B12 14-06-30 Pg 11)
What happens if A TTCS is not selected to the ON position on the T /0 data set page of the MCDU during take-off?
In the case of two engines operating, or one engine failure, at T /0 with A TTCS off and TLA at TOGA or MAX, there will be no thrust increase to T/0 RSV.
NOTE: With Windshear on T /0 and TLA is MAX, GA RSV is set by the FADEC.
(B12 14-06-30 Pg 4)
How many idle mode selections are there?
The idle mode selections are the following:
- Flight Idle.
- Approach Idle.
- Final Approach Idle.
- Ground Idle.
(B12 14-06-30 Pg 7)
How many channels does the FADEC have and when do they change in normal operation?
The FADEC has two identical but isolated channels. One operates as the in-control channel and the other as a standby. The standby channel constantly processes all the data and is always ready to take control of the engine in case the active channel fails. The FADEC in-control channel is switched on every engine start.
(B12 14-06-30 Pg 1)
