Engines / APU

Question 1

Engine ignition limitation

Answer 1

Limitations: engine ignition must be on for Takeoff, landing, heavy rain, anti-ice operation.
QRH: engine ignition must be in CONT for: emergency descent, all flaps up landing.
QRH: engine ignition must be in FLT for: loss of thrust on both engines, volcanic ash, engine inflight start (windmill start), engine high vibrations in icing conditions.
FCOM: engine ignition must be in FLT for: fan ice removal, severe turbulence. Engine ignition must be in CONT for Moderate to Heavy Rain, Hail or Sleet.

Question 2

APU operation limitations

Answer 2

Bleed +elec: 10000’
Only bleed: 17000’
Only elec load: 41000’

Question 3

APU Consecutive starts limitation

Answer 3

After 3 consecutive start attempts, 15 min cooling period.

Question 4

Engine EGT temperature limits for takeoff, max continuous and starting.
Are their any time limits?

Answer 4

Takeoff: 950 deg.for 5 min, 10 minutes allowed in the event of loss of thrust on one engine during takeoff.
Continuous: 925 deg.
Starting: 725 deg.
(AFM section 1, p.7A)

Question 5

What is the minimum oil pressure?

Answer 5

13 psi.
If engine oil pressure is in the yellow band with takeoff thrust set, do not takeoff.
(AFM section 1 p.8)

Question 6

Engine ignition must be on during which conditions?

Answer 6

Engine ignition must be on for: 
1. Takeoff
2. Landing
3. Operation in heavy rain
4. Anti-ice operation.
(FCOM limitations)