Engine Systems

Question 1

What is the time limit for TOGA?

Answer 1

5min or 10min OEI

Question 2

When is the Fuel used indicator reset?

Answer 2

1st start Master switch on

Question 3

What start faults does the FADEC protect against?

Answer 3

Hot, Hung, Stall, Failed light up and TL not idle.

Question 4

What will the FADEC do if Start Fault

Answer 4

FAULT on
Turns off Fuel and Ign
Dry crank for 30sec at max motor

Question 5

What will happen if residual EGT above 250deg?

Answer 5

Will do an auto dry crank during start. To get below 250deg

Question 6

How does FADEC start an engine in the air?

Answer 6

Will decide whether enough windmiling or needs assistance.

Question 7

What happens during a Auto Start procedure?

Answer 7

Master switch on,
Start Valve open
IGN 30 sec after (immediately in air)
Fuel HP 30sec after Master on
N2 rise
Oil PX
IGN
FF
EGT
EPR

Question 8

What are the normal indications after start?

Answer 8

2-4-6
N1 20%
EGT 400deg
N2 60%

Question 9

What N2 will start valve close?

Answer 9

43%

Question 10

What are the three Idle modes?

Answer 10

Reverse, Approach and Modulated. Reverse Idle is slightly higher than forward reverse thrust.

Question 11

What is the lowest speed with full reverse?

Answer 11

70kts

Question 12

What is modulated Idle and when is it selected?

Answer 12

Regulated Idle according to bleed system and ambient conditions. In air with flaps lever at zero. On ground if no reverse.

Question 13

What is Approach Idle and when is it selected?

Answer 13

Regulated according to altitude and not bleed demand. Selected when flap lever not zero. Allows a quicker spool up time.

Question 14

What are the two FADEC modes?

Answer 14

EPR and N1

Question 15

When will it go to N1 mode?

Answer 15

Manually or when EPR not sensed by failure of P2 and/or P5 sensors. Will also go to degraded N1 with Emergency Elec Config

Question 16

What is the difference between EPR and N1 rated?

Answer 16

Thrust is set to N1 rather than EPR

Question 17

What is degraded N1 mode?

Answer 17

Basically you wont have any protections for N1 limit.

Question 18

What do you loose with N1 mode?

Answer 18

Autothrust and A Floor protection.

Question 19

How do you change from FLX to MCT?

Answer 19

Go out to TOGA or CL then back to FLX/MCT.

Question 20

Which IGN are used during Start?

Answer 20

Alternates during first automatic start. Both in Manual start. Cut out at 43%. Both IGN in the air.

Question 21

How do you turn on Continuous IGN after a start?

Answer 21

Start switch back to Norm then Start/IGN.

Question 22

What is a windmiling quick relight?

Answer 22

If you accidently switch a master off in flight, if within an envelope it will try an auto restart.

Question 23

When FADEC aborts the start how long is the dry cranking sequence?

Answer 23

30sec

Question 24

In an Automatic start, what will happen if you forget to set the master switch to on?

Answer 24

After 30sec the Pack Valves will open.