Engine Ops Limits

Question 1

Normal engine ITT range is _____ (Malfunction if stabilized above).

Answer 1

275°-865°C

Question 2

Stabilized engine ITT above _____ at IDLE power could indicate a failing outer transition liner; ABORT.

Answer 2

675°C

Question 3

Maximum acceptable engine ITT during engine starting or acceleration is _____ ITT for _____.

Answer 3

900°C; 12 seconds

Question 4

ENG HOT light will illuminate at _____ ITT.

Answer 4

880°C

Question 5

Continuous engine core RPM operating range is _____.

Answer 5

56%-100%

Question 6

Allowable core RPM range is _____ RPM for 3 seconds (yellow band).

Answer 6

100%-102%

Question 7

Engine core RPM must not exceed _____ RPM (red line).

Answer 7

102%

Question 8

Normal oil pressure range, core RPM IDLE to MAX, is _____ PSI.

Answer 8

55-95

Question 9

Acceptable oil pressure range, core RPM IDLE to 85%, is _____ PSI.

Answer 9

40-55

Question 10

Engine may operate at IDLE for emergency use only if oil pressure falls to the range of _____ PSI (red band).

Answer 10

30-40

Question 11

Do not operate an engine if oil pressure falls below _____ PSI.

Answer 11

30

Question 12

ENG OIL PRESS light will illuminate at _____ PSI and below.

Answer 12

34-39

Question 13

Max oil pressure when air temperature is -30°C or below is _____ PSI.

Answer 13

100

Question 14

Oil pressure fluctuation limits are _____ PSI within steady state range.

Answer 14

+/- 5

Question 15

Allowable intermittent oil pressure fluctuation limits are _____ PSI for a maximum of _____.

Answer 15

+/- 10; 2 seconds

Question 16

During zero-G or negative-G flight, oil pressure may fall to _____ PSI.

Answer 16

0

Question 17

Normal engine fan speed operating range is _____ RPM.

Answer 17

22%-98%

Question 18

Engine fan speed range of _____ RPM (steady state) indicates an engine malfunction.

Answer 18

98%-100%

Question 19

Normal engine fuel flow range is _____ pounds per hour (PPH).

Answer 19

150-4100

Question 20

During an engine start, light off must occur within _____ of fuel flow.

Answer 20

20 seconds

Question 21

If an engine fails to light off, move the throttle to OFF, dry motor for _____ and wait _____ before attempting another start.

Answer 21

30 seconds; 1 minute

Question 22

During engine start, its hydraulic system pressurizes at _____ RPM.

Answer 22

37%-47%

Question 23

During engine start, its AC generator comes online at _____ RPM.

Answer 23

52%

Question 24

During engine start, the ENG START CYCLE light should go out and the APU should unload _____ after the core RPM passes _____.

Answer 24

10 seconds; 56%

Question 25

Failure of the ENG START CYCLE light to go off within _____ after core RPM passes _____ may damage the ATS.

Answer 25

30 seconds; 56%

Question 26

During a start, the engine should accelerate to minimum IDLE core RPM within _____ of ITT rise (light off).

Answer 26

60 seconds

Question 27

ATS can make consecutive engine starts with _____ between cycles.

Answer 27

60 seconds

Question 28

ATS is limited to _____ for motoring an engine, followed by a rest period of _____.

Answer 28

2 minutes; 5 minutes

Question 29

Moving the engine operate switch to IGN provides _____ of ignition regardless of throttle position or core RPM.

Answer 29

30 seconds

Question 30

Engines take approximately _____ to accelerate from IDLE to MAX.

Answer 30

10 seconds

Question 31

The high-bypass turbofan produces _____ of the engine’s total thrust.

Answer 31

85%

Question 32

During takeoff roll, write up engine performance on 781s if fan speed is _____ below predicted takeoff fan speed.

Answer 32

2%

Question 33

During takeoff roll, abort the takeoff if engine fan speed is _____ below predicted takeoff fan speed.

Answer 33

3%

Question 34

An assisted engine air start requires up to _____ from initiation of the APU start to usable engine thrust.

Answer 34

110 seconds

Question 35

During a crossbleed engine start (while airborne), the bleed-air demand results in a _____ loss of thrust.

Answer 35

4%

Question 36

During a crossbleed Engine start, operating engine must be at least _____ RPM to supply sufficient bleed air.

Answer 36

85%

Question 37

For assisting air starts, motor to cool the engine below _____ (altitude permitting); when above 15,000’ MSL, motor the engine below _____.

Answer 37

150°C; 100°C

Question 38

Prior to shutdown, operate engines at IDLE (</= 80%) RPM for _____.

Answer 38

5 minutes

Question 39

During engine shutdown, hold throttle against aft stop until fuel has drained, or until core RPM is below _____ and ITT falls below _____.

Answer 39

5%; 200°C

Question 40

Motor engine at _____ until engine is below _____ ITT (Local Standard).

Answer 40

20%; 100°C