Engine Ops Limits Flashcards
Normal engine ITT range is _____ (Malfunction if stabilized above).
275°-865°C
Stabilized engine ITT above _____ at IDLE power could indicate a failing outer transition liner; ABORT.
675°C
Maximum acceptable engine ITT during engine starting or acceleration is _____ ITT for _____.
900°C; 12 seconds
ENG HOT light will illuminate at _____ ITT.
880°C
Continuous engine core RPM operating range is _____.
56%-100%
Allowable core RPM range is _____ RPM for ___ seconds (yellow band).
100%-102%, 3
Engine core RPM must not exceed _____ RPM (red line).
102%
Normal oil pressure range, core RPM IDLE to MAX, is _____ PSI.
55-95
Acceptable oil pressure range, core RPM IDLE to 85%, is _____ PSI.
40-55
Engine may operate at IDLE for emergency use only if oil pressure falls to the range of _____ PSI (red band).
30-40
Do not operate an engine if oil pressure falls below _____ PSI.
30
ENG OIL PRESS light will illuminate at _____ PSI and below.
34-39
Max oil pressure when air temperature is -30°C or below is _____ PSI.
100
Oil pressure fluctuation limits are _____ PSI within steady state range.
+/- 5
Allowable intermittent oil pressure fluctuation limits are _____ PSI for a maximum of _____.
+/- 10; 2 seconds
During zero-G or negative-G flight, oil pressure may fall to _____ PSI.
0
Normal engine fan speed operating range is _____ RPM.
22%-98%
Engine fan speed range of _____ RPM (steady state) indicates an engine malfunction.
98%-100%
Normal engine fuel flow range is _____ pounds per hour (PPH).
150-4100
During an engine start, light off must occur within _____ of fuel flow.
20 seconds
If an engine fails to light off, move the throttle to OFF, dry motor for _____ and wait _____ before attempting another start.
30 seconds; 1 minute
During engine start, its hydraulic system pressurizes at _____ RPM.
37%-47%
During engine start, its AC generator comes online at _____ RPM.
52%
During engine start, the ENG START CYCLE light should go out and the APU should unload _____ after the core RPM passes _____.
10 seconds; 56%
Failure of the ENG START CYCLE light to go off within _____ after core RPM passes _____ may damage the ATS.
30 seconds; 56%
During a start, the engine should accelerate to minimum IDLE core RPM within _____ of ITT rise (light off).
60 seconds
ATS can make consecutive engine starts with _____ between cycles.
60 seconds
ATS is limited to _____ for motoring an engine, followed by a rest period of _____.
2 minutes; 5 minutes
Moving the engine operate switch to IGN provides _____ of ignition regardless of throttle position or core RPM.
30 seconds
Engines take approximately _____ to accelerate from IDLE to MAX.
10 seconds
The high-bypass turbofan produces _____ of the engine’s total thrust.
85%
During takeoff roll, write up engine performance on 781s if fan speed is _____ below predicted takeoff fan speed.
2%
During takeoff roll, abort the takeoff if engine fan speed is _____ below predicted takeoff fan speed.
3%
An assisted engine air start requires up to _____ from initiation of the APU start to usable engine thrust.
110 seconds
During a crossbleed engine start (while airborne), the bleed-air demand results in a _____ loss of thrust.
4%
During a crossbleed Engine start, operating engine must be at least _____ RPM to supply sufficient bleed air.
85%
For assisting air starts, motor to cool the engine below _____ (altitude permitting); when above 15,000’ MSL, motor the engine below _____.
150°C; 100°C
Prior to shutdown, operate engines at IDLE (</= 80%) RPM for _____.
5 minutes
During engine shutdown, hold throttle against aft stop until fuel has drained, or until core RPM is below _____ and ITT falls below _____.
5%; 200°C
Motor engine at _____ until engine is below _____ ITT (Local Standard).
20%; 100°C
Cold wx: Oil px may peg at ___ PSI after start. Shut down the engine if pressure does not decrease toward green band within ___ minutes.
100; 2.5
