777 Primary Engine Display
by jerome meriweather
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Left to Attitude or Airspeed or Altimeter
Right to LDG Gear
Down to ENG2
To View a Control's Description, MouseOver it and ...
Click to "Show" - MouseDown to "Drag" - DoubleClick to "Hide"
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777 Photo and/or Graphic Element
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The 777 is powered by two Pratt & Whitney PW4077 engines rated at 77,000 pounds of takeoff thrust each. Each high bypass turbofan engine
is automatically controlled by an Electronic Engine Controller ( EEC ), which monitors autothrottle and manual throttle inputs.
The N1 and N2 rotors are mechanically independent. The N2 rotor drives the engine accessory gearbox.
Normally this Engine Screen is displayed on the upper center display unit of the Forward Instrument Panel, but should there be a failure,
the Primary Engine Display is automatically switched to the lower center Secondary Engine Display unit of the Forward Instrument Panel.
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Red Line / Start Limit Lines
- Exhaust Gas Temperature ( EGT ) Red Line - Maximum takeoff EGT.
- Maximum Exhaust Gas Temperature ( EGT ) Start Limit - This mark is displayed when the Fuel Control Switch is in Cutoff Mode
or Engine Speed is below idle.
Fuel Temperature Indicator
Indicates fuel temperature.
Total Fuel Indicator
Indicates the total amount of fuel carried in a center and two main (left/right) tanks. Each fuel tank contains 2 AC pumps and each pump is
capable of suppling sufficient fuel to operate one engine under all conditions. The center tank pumps override the 2 main tank pumps so that
the center tank fuel is used first. Any fuel pump can supply either engine.
Flaps Load Relief Indicator
Indicates flaps and/or slats are retracted automatically as required to prevent load damage. Commanded extension is inhibited due to excessive
airspeed or altitude.
Flaps Indicator
Displays combined flap and slat positions when all surfaces are operating normally in the primary mode. The line and number change color from
Magenta - slats and flaps are in transit , to Green - slats and flaps are in the commanded position.
Landing Gear Indicator
Indicates that the Landing Gear is either UP or Down and locked into position. A white crosshatch indication replaces UP or Down when gears
are in transit. An empty white box is displayed if all landing gear position indicators are inoperative.
Engine Anti-Ice ( EAI )
Indicates that EAI is on.
Digital - Exhaust Gas Temperature ( EGT )
Displays EGT in °C. The display is White in normal operating range, Amber when maximum continuous limit is reached and Red when start or
takeoff limit is reached.
Low Pressure Rotor Speed ( N1 )
N1 operating limit.
Wing Anti-Ice ( WAI )
Indicates Wing Anti-Ice is on.
Graphic - Exhaust Gas Temperature ( EGT )
Displays EGT in °C. The display is White in normal operating range, Amber when maximum continuous limit is reached and Red when start or
takeoff limit is reached.
Low Pressure Rotor Speed ( N1 )
Display is White in normal mode and Red when limit is reached.
Engine Anti-Ice ( EAI )
Indicates that EAI is on.
Actual/Commanded Engine Pressure Ratio (EPR) Arc
Displays momentary difference between engine EPR and EPR commanded by thrust lever position.
Engine Pressure Ratio (EPR) Reference/Target
- Displays the EPR reference limit ( green ).
- Displays target EPR commanded by the FMS when VNAV is engaged ( magenta ) and autothrottle not in HOLD mode.
- Not displayed when reverse thrust is activated.
Total Air Temperature ( TAT )
Total Air Temperature in °C.
Graphic Engine Pressure Ratio ( EPR )
Left and Right Engine Graphic Actual EPR readings.
Low Pressure Rotor Speed ( N1 )
Display is White in normal range and Red when limit is reached.
Engine Pressure Ratio (EPR) Maximum
Maximum EPR level.
Engine Pressure
- Displays the EPR reference limit ( green ).
- Displays target EPR commanded by the FMS when VNAV is engaged ( magenta ) and autothrottle not in HOLD mode.
- Not displayed when reverse thrust is activated.
Thrust Reference Mode
Displays the thrust reference mode selected by the FMC. The modes are:
- G/A - Max rated go-around thrust.
- TO - Maximum rated takeoff thrust.
- TO 1 - Derate one takeoff thrust (not used).
- TO 2 - Derate two takeoff thrust (not used).
- D-TO - Assumed temperature derate takeoff thrust.
- D-TO 1 - Derate one assumed temperature derate takeoff thrust. (not used)
- D-TO 2 - Derate two assumed temperature derate takeoff thrust. (not used)
- CLB - Max rated climb thrust.
- CLB 1 - Derate one climb thrust.
- CLB 2 - Derate two climb thrust.
- CON - Max rated continuous thrust.
- CRZ - Max rated cruise thrust.
Digital Engine Pressure Ratio ( EPR )
Left and Right Engine Digital Actual EPR readings.
EPR / REV
Displays digital selected EPR Reference. REV replaces digital EPR reference when reverse thrust is activated. Amber when reversers are in
transit; green when fully deployed.
Assumed Temperature
Selected Assumed Temperature for reduced thrust takeoff is displayed in °C.