Flashcards in Engines Deck (60):
Engine description and thrust?
What rotor drives the accessory gearbox?
What is the primary control for the engines using either the autothrottles or manual pilot throttle inputs?
The Electronic Engine Controllers (EECs)
What are the three primary engine indications?
EPR, N1, and EGT
What is the amber (maximum continuos) inhibit for EGT, N1, N2, and N3 indications during takeoff or go-around?
Inhibited for 5 minutes
Are the red line limits inhibited during take off or go-around for EGT, N1, N2, or N3?
When does compact mode automatically occur?
On failure of one of the EICAS CRTs
Which system calculates maximum EPR for all phases of flight? What about when that system is OFF or INOP?
EEC, or alternatively the TMC
With the EEC on what happens when thrust levers moved to the forward stop position?
Maximum calculated EPR will be maintained
What does green and amber REV indication mean?
Green means the reverser is fully deployed and amber means the reverser is unlocked or in transit
What does the TMC calculate reference EPR from for the various modes? What are the modes? (8)
Based on pressure altitude and ambient temperature
TO, D-TO, CLB, CLB1, CLB2, G/A, CRZ, CON
Two places to enter an assumed temperature?
Through either the TMSP or the CDU TAKEOFF REF page
When MAN is set on the TMSP what default manual EPR value is first indicated?
When in VNAV does the FMC control the thrust modes automatically?
Can the FMC set reduced thrust climb values?
No, must be done manually
What is assumed temperature takeoff limited to? (2)
25% reduction of takeoff thrust or climb thrust - whichever is greater
How know when max assumed temperature is reached?
When dialling in a greater temperature on the TMSP or on CDU TAKEOFF REF page does not changed the displayed assumed temperature or reference thrust value
What % of thrust does climb 1 give?
What amount of thrust does climb 2 give?
Enough to meet a min single engine climb gradient, increasing to 88% when flaps 1 selected or above 3000ft AGL or 10000ft AMSL
Two types of thrust control systems?
EECs and hydromecnanical
When the EECs are turned off what controls thrust?
Hydromechanical engine fuel control
What powers the EECs?
Each EEC is powered by dual dedicated generators
Why should the thrust lever be moved to a mid point position when turning an EEC off?
To prevent a possible engine overboost because under normal operations the EECs trim a bit of fuel from the hydromecnanical fuel control system
What does ELC do?
Prevents engine limits being exceeded by taking fuel away
Why take thrust lever to mid point before turning ELC off?
Prevent possible overboost as any trim level held by ELC comes out when turned off
How ELCs powered?
Each ELC powered by dual dedicated generators
What are the two channels of the EECs? What do they do?
Supervisory Channel - Provides EPR overboost protection
Limiter Channel - provides N1 overspeed protection
Is there N2 overspeed protection?
Wha provides N3 overspeed protection?
Fuel control unit
Two different idle settings?
Minimum idle and approach idle
What drives the engine starter?
How long does the engine EGT start limit remain indicated during engine start?
Until the engine has stabilised at idle
What two things does fuel controls switches control?
Fuel and ignition
What rotor is the engine starter connected to?
What does the VALVE light indicate on start?
The start valve failed to open
When add fuel during engine start?
25% N3 or max motoring rpm
When is max motoring rpm reached?
When N3 acceleration is less than approx 1% in 5 seconds
What fuel valves does the fuel control switch operate?
The spar and engine fuel control valves
When does start selector move back from GND to AUTO during start?
AT approx 47%
What does L or R STARTER CUTOUT during start mean?
Start valve has failed to close automatically so need to move start switch to off to close the starter
When is rich start used?
Cold starts and in flight starts when EGT is zero
Starter cycle limits?
Up to 2 min - then Zero N3
Up to 2 min - then Zero N3
Up to 2 min - then Zero N3 and 15 min cool down time
Recommended N3 re-engagement speed? (2)
0% N3 recommended
0-20% N3 Normal
Recommended re-engagement above 20% N3 not recommended except in case of?
Re-engagement above 30% N3 may result in?
Damage to starter or gearbox
Main and back up power sources for the engine ignition system?
Main AC = primary
Standby AC = backup
How is the fuel heated?
Through a fuel/oil heat exchanger
What are the system components in order of the engine fuel system from manifold to engine? (8)
Spar valve - First stage pump - Fuel/Oil Heat exchanger - First Filter - Second stage pump - Fuel control unit (with trim motor from EEC and ELC) - Engine Valve - Fuel Flow Meter - Second Fuel Filter
What controls both the engine and spar fuel valves? (2)
Both the fuel control switch and the fire handles
Is there a bypass for the first fuel filter?
How is a fuel bypass (first fuel filter) situation indicated?
L or R ENG FUEL FILT on EICAS
Where is oil temperature measured?
After it leaves the engine before it goes back into the oil resevoir
Can the main oil filter be bypassed and what indication it is clogged?
No. EICAS = L or R OIL FILTER
Can the scavenge oil filter be bypassed?
Are there any limits for oil quantity or flight crew procedures?
How reverse thrust actuated?
The revers thrust levers can only be raised when the thrust levers are in what position?
What two other things automatically occur when thrust levers moved to idle?
1. Autothrottle disengages (warnings inhibited during autoland)
2. Autospeed brakes deploy (for RTO - deploy when set to auto on landing via other means)
Thrust levers cannot be moved forward until reversers are?
stowed and locked