Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
25 Cards in this Set
- Front
- Back
|
Power Management Control does what?
|
Uses Main Engine Control thrust lever angle, N1 speed, inlet temp and pressure to adjust the MEC (fuel flow) to obtain desired N1
|
|
|
What does EEC do?
|
The EEC uses sensed flight conditions and bleed air demand to calculate N1 values. The EEC compares commanded N1 to actual N1 and adjust fuel flow until actual N1 equals commanded N1
|
|
|
With EEC in normal mode what does advancing thrust levers to stop do? Does it have in-built protections?
|
With EEC in normal mode, it limits thrust to maximum certified thrust ratings for current conditions.
It has N1 and N2 exceedance protection but not EGT redline exceedance protection |
|
|
Explain EEC alternate mode
(soft and hard) |
Soft Alternate - if EEC cnat get req signals, the EEC uses the last valid flight conditions to define engine parameters.Thrust shortfalls or exceedances may occur.
Hard Alternate (activated from SOFT mode by thrust lever to idle or selecting ALTN) - the EEC reverts to the alternate mode thrust schedule. Thrust is always equal to or greater than normal mode thrust settings. Maximum certified thrust rating can be exceeded. |
|
|
Explain ground, flight and approach idle.
|
Ground and flight idle are same as classic. Approach idle is selected when flaps are in landing config or engine anti ice is ON (if flap or anti ice signals are unavailable, appr idle is selected below FL150)
|
|
|
FILTER BYPASS light
|
Indicates an impending or actual bypass of the fuel filter due to contamination (OR ICE !!)
|
|
|
ENG VALVE CLOSED light indicates? And is activated by what?
|
Indicates engine fuel shutoff valve, located in wing mount, is closed. Electrically activated by either engine start lever or eng fire warning switch
|
|
|
SPAR VALVE CLOSED light indicates? And is activated by what?
|
Indicates spar shutoff valve, located in wing mount, is closed. Electrically activated by either engine
|
|
|
How does oil system work?
|
Oil is stored in a tank. It the passes thru an oil pump, thru an oil filter and continues to engine bearings and gearbox. The oil then returns via a scavenge pump through a scavenge filter. After the filter it passes thru the fuel/oil heat exchanger before returning to the tank.
|
|
|
LOW OIL PSI is measured where?
|
Oil pressure is measured downstream from the filter prior to entering the engine
|
|
|
Where is OIL TEMP measured?
|
In the supply line
|
|
|
How does the engine start switch work? (GRND)
|
GRND - uses DC power from battery bus to open the starter valve and allow pressure from pneumatic source to rotate the starter. Igniters are energized
|
|
|
When is the STARTER LEVER advanced to IDLE DETENT?
|
AT 25% N2 or minimum 20% N2 and max motoring (5 sec per 1%)
|
|
|
Once START LEVER is selected to IDLE DETENT during start, what occurs?
|
Fuel is introduced. Selected igniters are engaged and EGT should increase with light off.
|
|
|
On engine shutdown, at what speed should started not be engaged?
|
Starter should not be re-engaged until engine speed is below 20% N2
|
|
|
Which igniters are energized with selection of GRND, CONT or BOTH? Why is first start of day off right IGN?
|
GRND & CONT - selected igniters
FLT - both igniters First flight of the day is off IGN R as it is supplied off AC STBY BUS and is the only one available during STBY power (checking it works!) |
|
|
During engine start what does EEC protect? is it the same for in flight starts?
|
EEC provides hot start, EGT exceedance and wet start protection. These are not available in flight.
|
|
|
What are indications of impending hot start?
|
A white, flashing box surrounds EGT readout. (stops when start lever to CUTOFF or engine reaches N2 idle)
|
|
|
What is wet start? How is it protected?
|
Wet start occurs when there is no light off after engine START LEVER in IDLE DETENT.
Wet start protection occurs by the EEC shuting off ignition and fuel to engine after 15 sec of wet start detection. (Pilot should abort start after 10 sec if not light off) |
|
|
Is there flameout protection? How does it work?
|
Yes there is protection. If an uncommanded rapid decrease in N2 occurs between 57% and 50%, the EEC will activate both igniters even with ENGINE START SWITCHES in OFF
|
|
|
Which hydraulic system operates the thrust reversers?
|
HYD A operates engine 1. HYD B operates engine 2. If HYD A or B fails, alternate operation is available thru STBY HYD
|
|
|
What is required to allow thrust reverser deployment?
|
Either Radio Altimeter senses less than 10 feet
or Air/ground sensor is in ground mode |
|
|
What does REVERSER light indicate?
|
It is illuminated when reverser is commanded to stow. If remains illuminated, a malfunction has occurred.
|
|
|
How does Auto-Restow function work?
|
Senses compare the actual reverser sleeve position vs the commanded reverser postion.
If a difference is sensed then the reversers are commanded to deploy and then re-stow |
|
|
ENGINE CONTROL LIGHT
|
There is a fault in the engine control system (only ground below 80kt) DO NOT takeoff
|
