Engines / Thrust Levers

Question 1

ENGINE / THRUST LEVERS

Q:​ What controls​ the engines in​ all operating regimes?​ ​

Answer 1

Ref: (FOM VOL. III-DSC-70-20) ​

FADECs (Full​ Authority Digital Engine Controls)​

Question 2

ENGINE / THRUST LEVERS

Q:​ What functions​ does the FADEC control? ​

Answer 2

Ref: (FOM VOL. III-DSC-70-20)​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

• Fuel metering​ ​
• Engine​ limits based on thrust lever​ angle
• Start sequencing​ ​
• Provides engine indications and​ thrust limit displays on the E/WD

Question 3

ENGINE / THRUST LEVERS

Q:​ What redundancy​ does​ the​ FADEC have? ​

Answer 3

Ref: (FOM VOL. III-DSC-70-20) ​

Dual​ channel redundancy​ –​ one channel is​ active​ while​ the​ other is​ standby

Question 4

ENGINE / THRUST LEVERS

Q:​ What is​ the​ power​ source​ for​ the​ FADEC?​ ​

Answer 4

Ref: (FOM VOL. III-DSC-70-20) ​

• The​ system has its​ own​ alternator making​ it​ independent of​ the aircraft​ electrical system when ​N2​ is​ above​ a set value ​
• If​ this alternator fails​ the​ FADEC automatically switches​ to aircraft​ electrical power​

Question 5

ENGINE / THRUST LEVERS

Q:​ When will​ the​ FADEC abort a start? ​

Answer 5

Ref: (FOM VOL. III-DSC-70-80-40)​ ​

• Hot​ start​ ​
• Stalled​ start​ ​
• No​ ignition​

Question 6

ENGINE / THRUST LEVERS

Q:​ When does​ the FADEC command​ a higher engine​ idle​ speed?​ ​

Answer 6

Ref: (FOM VOL. III-DSC-70-20) ​

• Bleed​ demands​ ​ ​ ​ ​
• Approach Configuration ​
• High engine​ or​ IDG temperatures

Question 7

ENGINE / THRUST LEVERS

Q:​ How many​ igniters fire on manual​ or in-flight starts? ​

Answer 7

Ref: (FOM VOL. III-DSC-70-80-30)​ ​

Both A and B

Question 8

ENGINE / THRUST LEVERS

Q:​ When does​ continuous​ ignition automatically operate?​ ​

Answer 8

Ref: (FOM VOL. III-DSC-70-80-30)​ ​

• Engine​ flameout detection​ ​
• Failure​ of​ the​ Engine​ Interface Unit​ (EIU)

Question 9

ENGINE / THRUST LEVERS

Q:​ What is​ the​ active​ range​ of​ the​ A/THR?​ ​

Answer 9

Ref: (FOM VOL. III-DSC-70-30-20,​ FOM​ VOL.​ III-DSC-22-30-90)

• Just above​ IDLE​ to the​ CL detent (2​ engines) ​
• Just above​ IDLE​ to the​ MCT detent (1​ engine)

Question 10

ENGINE / THRUST LEVERS

Q:​ What determines the​ maximum​ thrust the​ A/THR system will​ be able​ to​ command?​ ​

Answer 10

Ref: (FOM VOL. III-DSC-70-30-40)​ ​ ​

The​ position detent​ of the​ thrust lever​

Question 11

ENGINE / THRUST LEVERS

Q:​ What are​ 3 ways to disconnect the A/THR?​ ​

Answer 11

Ref: (FOM VOL. III-DSC-22-30-90)​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

• Instinctive Disconnect​ buttons ​
• Thrust​ Levers​ to​ IDLE​ ​
• A/THR​ pushbutton​

Question 12

ENGINE / THRUST LEVERS

Q:​ How do you disconnect​ the​ A/THR for the​ remainder of the​ flight?​ ​

Answer 12

Ref: (FOM VOL. III-DSC-22-30-90)​ ​

Press​ and hold​ the​ Instinctive Disconnect Pushbutton for​ 15​ seconds

Question 13

ENGINE / THRUST LEVERS

Q:​ What would you lose if you held down the​ Instinctive Disconnect Pushbutton for more​ than 15 ​seconds? ​

Answer 13

Ref: (FOM VOL. III-DSC-22-30-90)​ ​

Alpha Floor​ Protection

Question 14

ENGINE / THRUST LEVERS

Q:​ What happens to thrust​ and what​ annunciates​ on​ the​ FMA​ when you​ reach Alpha Floor?​ ​

Answer 14

Ref: (FOM VOL. III-DSC-22-30-90)​ ​

• Thrust​ –​ TOGA​ ​
• FMA –​ A.FLOOR​

Question 15

ENGINE / THRUST LEVERS

Q:​ How do you regain​ normal​ A/THR when in TOGA LK or​ THR LK?​ ​

Answer 15

Ref: (FOM VOL. III-DSC-22-30-90)​ ​

• Move Thrust Levers​ to the​ TOGA​ detent​ ​
• Press​ the​ Instinctive​ Disconnect​ button​ ​
• Return​ Thrust Levers to CL detent​ ​
• Push the​ A/THR​ pushbutton​ to engage​ A/THR​

Question 16

ENGINE / THRUST LEVERS

Q:​ When is Alpha Floor​ Protection active?​ ​

Answer 16

Ref: (FOM VOL. III-DSC-22-30-90)​ ​

From lift-off​ through​ 100​ feet RA​ on​ approach​

Question 17

ENGINE / THRUST LEVERS

Q:​ When would Thrust Lock occur? ​

Answer 17

Ref: (FOM VOL. III-DSC-22-30-90)​

• Thrust​ levers​ in CL​ detent and A/THR​ pushbutton​ on​ the​ FCU​ is pushed,​ or​
• A/THR​ disconnects​ due​ to​ a failure

Question 18

ENGINE / THRUST LEVERS

Q:​ What does​ a fault​ light on the​ ENG​ panel indicate? ​

Answer 18

Ref: (FOM VOL. III-DSC-70-90) ​

• Auto start abort​ ​
• Switch disagreement between HP valve and its commanded​ position

Question 19

ENGINE / THRUST LEVERS

Q:​ What controls​ the engine​ LP fuel valves?​ ​

Answer 19

Ref: (FOM VOL. III-DSC-70-40,​ FOM​ VOL.​ III-DSC-70-41) ​ ​ ​

• Engine​ MASTER​ switch​ ​
• ENGINE​ FIRE​ pushbutton​

Question 20

ENGINE / THRUST LEVERS

Q:​ If​ the​ FADEC detects a fault​ during automatic start,​ is any​ crew intervention required?​ ​

Answer 20

Ref: (FOM VOL. III-DSC-70-80-40) ​

No. The​ FADEC​ will discontinue the​ start, clear the​ engine, and attempt a restart (if​ warranted)​ ​automatically​.