Engines CBT's Flashcards
On the 400, there are 2 types of engines. The CF6-80C2-B1F or the B5F. What is the difference?
The B1F is derated from the B5F and has a lower takeoff thrust rating.
Generally, what type of jet engine does the 747 have?
Dual rotor, axial flow, turbofan of high compression and bypass ratio.
How many ignitors does each engine have?
2
What is the “FADEC” called?
EEC (Electronic Engine Control)
What would a magenta oil quantity number mean?
It means it is the lowest oil quantity of all 4 engines
The secondary engine indications display when:
- Selected using the Secondary Engine Display switch (the ENG switch on the display select panel).
- The display initially receives electrical power.
- A fuel control switch is moved to CUTOFF in flight.
On any engine parameter indication (N1, N2, EGT, etc), the normal operating range is what color?
White
With autostart on, what does pulling an engine start switch do?
-Arms start valve
-Opens engine bleed air valve
After you pull an engine start switch, when does the switch release and fall back to its normal position?
At 50% N2
At 50% N2, the start switch releases. What happens when this occurs?
-Start valve closes
-Engine bleed valve closes
What is the difference between pulling the engine start switch when autostart is on or off?
ON: - ARMS start valve
- Opens engine bleed air valve
OFF: -OPENS start valve
-opens engine bleed air valve
You see an engine start switch illuminate white. What is this telling you?
That the start valve is open
What does selecting the CON switch on do on the engine start and ignition overhead panel?
-selected ignitors operate continuously
-commands approach idle MINIMUM
On the engine start and ignition overhead panel, what does the “SINGLE” and “BOTH” knob do?
SINGLE: EEC alternates between igniter 1 and 2 after each ground start (both for inflight flameout)
BOTH: selects all igniters
When do selected ignitors activate?
-During start (below 50% N2)
-Any flap deployment
-Nacelle anti-ice ON
-Engine flameout
On the engine start and ignition overhead panel, what does the STBY knob titled “1, NORM, 2” do?
It determines where the electricity will come from to power the selected igniters.
NORM: AC powers selected igniters (standby power system kicks in if no AC)
1 or 2: Standby power will be used to supply either igniter 1 or 2.
Two conditions will automatically activate ignition for all engines simultaneously.
These conditions are:
• the trailing edge flaps are out of the up position, or
• the Continuous Ignition switch is ON.
Certain conditions require the Continuous Ignition to be on. They are:
• Heavy rain
• Severe turbulence
• Volcanic ash
• Icing conditions
• Standing water or slush on runway.
Note: Continuous ignition is automatically provided when nacelle anti-ice is ON.
What happens when you move an engine fuel control switch into the RUN position?
Autostart ON:
-Opens spar fuel valve
-Opens engine fuel valve
-EEC sequences start valve, fuel metering valve, and igniter operation
Autostart OFF:
-Opens spar fuel valve
-Opens engine fuel valve
-Energizes igniters
What happens when you position a fuel control switch to CUTOFF?
-Closes fuel valves
-Removes igniter power
-Commands hydraulic demand pump to operate (when in auto)
-Unlocks engine fire switch
When the engines are OFF, you will see a magenta line on the N2 tape. What does this mean?
This is a “fuel on” indicator line. This displays the minimum N2 at which the fuel control switch could be moved to RUN during a manual start. It is simply for guidance to the pilots.
During start, you notice an extra red line on the EGT tape that normally isn’t there when the engine is running. What is that?
It is the EGT start limit line. It simply tells you the EGT limit for the engine during start, and will disappear after start when the engine is stabilized.
The auto start system will monitor the engine start and automatically about for certain conditions. What are these conditions?
• Hot start
• Hung start
• No EGT rise
Note: The autostart system does not monitor oil pressure or N1 rotation.
If the engine does not light off during the first autostart attempt, what will it do?
It will purge the fuel and make another start attempt.
It will motor for 30 seconds and will try again with both ignitors.
It will try 3 start attempts before quitting, at which point it will motor for 30 seconds and close the fuel, ignition, and bleed air and give you an EICAS message “ENG 1,2,3,4 AUTOSTART”
