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2.1.1.4.4 EFD - Engine Fuel Display, Engine Parameters. The EFD, located on the main instrument
panel below the left digital display indicator (LDDI), is a night vision imaging system (NVIS)
compatible, monochromatic, liquid-crystal, grey/black display powered by the Signal Data Computer
(SDC).
The EFD normally displays critical engine parameters in the bottom half of the display and fuel
quantities in the top half. The fuel portion of the EFD is described in the Fuel System section. Invalid
parameters are displayed as ²999² in inverse video; out of limit parameters are highlighted by inverse
video. Nozzle position is displayed both graphically and digitally in percent open.
On battery power prior to APU start, the EFD displays only RPM and TEMP (figure 2-2). When the
APU switch is selected ON, the entire top level format is displayed but only RPM, TEMP, and OIL
pressure are valid. When the first engine alternator comes online at 10% N2 rpm, the FF parameter
also becomes valid. When the first generator comes online at 60% N2 rpm, all parameters for both
engines become valid. If the EFD locks up or blanks completely during engine start power transients,
the display can be reset by selecting the SDC RESET option from the SUPT MENU/FUEL display.
The EFD displays the following engine parameters within the listed display tolerances:
RPM Compressor rpm (N2 ) (0 to 104%)
TEMP Compensated turbine exhaust gas temperature (EGT) (0 to 1,999°C)
Figure 2-1. Throttle Grips (Front Cockpit)
A1-F18EA-NFM-000
I-2-7 ORIGINAL
FF Total commanded fuel flow including afterburner (0 or 400 to 65,000 pph in 100 pph
increments).
NOTE
Engine fuel flow is calculated from commanded engine fuel metering
valve position. In failure modes, fuel flow can be indicated on the EFD
even though no actual fuel is flowing.
OIL Oil pressure (0 to 200 psi)
NOZ VEN position (0 to 99% open)
During first engine battery start, the EFD RPM indication typically jumps from 0 to either 5% or
10%, and lightoff is indicated by TEMP rising from a minimum reported value of approximately
190°C. Each engine has three sources of N2 rpm: two engine alternator sensors and one accessory
gearbox sensor. The accessory gearbox sensor can provide rpm readings down to only 5% and is the
initial source of engine RPM. Readings from the alternator sensors are not available until the
alternator comes online above 10% N2 rpm. Input for the TEMP parameter is provided by a
compensated EGT algorithm in the FADEC. When actual EGT is below accuracy tolerances (e.g.,
engine shutdown), the FADEC limits the minimum reported TEMP (approximately 190°C). The FF
parameter is a calculated number based on metering valve position, not an actual measurement of fuel
flow. Consequently, an indication of fuel flow may be present when there is no flow, such as when the
throttle is above IDLE with the engine off.
Figure 2-2. Engine Fuel Display (EFD) - Engine Parameters
A1-F18EA-NFM-000
I-2-8 ORIGINAL
2.1.1.4.5 ENG Display. The ENG display (figure 2-3) is selected by pushing the ENG option from the
SUPT MENU. The ENG display shows the following engine and thermal management system
parameters:
ENG STATUS The current level of engine performance provided by the control system
INLET TEMP Engine inlet temperature (°C)
N1 RPM Fan speed (% rpm)
N2 RPM Compressor speed (% rpm)
EGT Exhaust gas temperature (°C)
FF Total commanded fuel flow (pph)
NOZ POS Nozzle position (% open)
OIL PRESS Engine oil pressure (psi)
THRUST Takeoff thrust (%), referenced to hot day MIL power (blanked inflight)
FAN VIB Fan vibration (inches/second)
CORE VIB Core vibration (inches/second)
EPR Engine pressure ratio (exhaust pressure to engine inlet pressure).
CDP Compressor discharge pressure (psia)
CPR Compressor pressure ratio
THA Throttle handle angle (deg)
AMAD OIL TEMP AMAD oil temperature (°C)
ENG OIL TEMP Engine oil temperature (°C)
FUEL INLET
TEMP
Engine inlet fuel temperature (°C)
FUEL NOZ TEMP Engine nozzle fuel temperature (°C)
FEED TANK
TEMP
Feed tank fuel temperature (°C)
When an engine or thermal management system related caution appears, the MENU option at the
bottom of each DDI is replaced with the ENG option, providing one pushbutton access to the ENG
display. The value of the out of limit parameter which triggered the caution is displayed in red and
highlighted by carets on either side. The CH A and CH B options at the top of the display are used to
command a manual FADEC channel transfer, and the active FADEC channel for each engine is boxed.
A1-F18EA-NFM-000
I-2-9 CHANGE 1
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本文链接地址：
NATOPS Flight Manual 飞行手册 1(33)
