Engines - Misc Flashcards
Primary purpose of flat rated engine is to provide ___ over wide ambient temp range
Constant Thrust
The F108-CF-100 engine develops approx ___ of thrust at sea level
22,000lbs
The ____ is a hydromechanical component which governs N2 by metering fuel to the engines based on throttle setting, as modified by engine control variables
Main Engine Control (MEC)
The MEC ____ automatically compensates for airplane ___ operation.
acceleration fuel schedule; engine bleed air
The ___ controls N1 by trimming the MEC to maintain constant thrust
Power Management Control (PMC)
With PMC off, MEC is controlled directly by
Throttles
PMC changes ___ through MEC to maintain desired ___ rating throughout takeoff and climb
fuel flow; thrust
During engine start, when the throttle is first poaced into the start range, the fuel flow ranges between ___ and ___ prior to lightoff (before ignition)
300 and 680 pph
With PMC OFF the engine no longer has ___ protection. For takeoff, the PMC inop engine should be set ___ less than the others
overboost; 2%
Except for EWO, do not takeoff with more than ___ PMC inop
1
EGT caution light comes on at
870 (+/-2)
The ___ and ___gages will be inop when only battery power is used during engine start (until a gen is online)
engine oil px; fuel flow
If EGT exceeds ___ shut engine down
930C
During start, if fuel flow exceeds ___ before light-off, a hot start can occur
680
During normal start, throttle is moved to START when N2 reaches
25%
If APU or start cart is unable to motor engine to 25%N2, the start sequence can be initiated when max motoring speed reached above ___. (Max motoring speed is less than __ increase in N2 in ___
20%N2; 1%; 5sec
Except cold wx starts, when throttle in START EGT should rise within
10sec
During start, after starter switch in START, ___should come on and stay on
Start Valve Open Light
When engine reaches ___, throttle should be placed in IDLE
50%
During at scramble start, throttle is moved to START at
20%N2
During scramble start, start outboards when inboards reach
42%
Starter damage can occure if starter reengaged above
63%N2
