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indicate that the setting does not represent the maximum N1 value.
On the ground, the FMS does not calculate the thrust settings until the OAT is entered on
the THRUST LIMITS page. The OAT entered must be followed by a degrees C or F.
Flex power for TO is selected by entering an assumed temperature on the THRUST LIMITS
page. Reduction in takeoff thrust is limited to ensure adequate aircraft performance in the
event of an engine failure. If entering an assumed temperature results in the calculated N1
FLX value being less than the maximum N1 reduction allowed, a LOW TAKEOFF N1 is
displayed on the THRUST LIMITS page and the FLX line remains blank. All FLX power
indications are displayed in magenta to differentiate them from other thrust settings.
The N1 values are influenced by the amount of 10th and 14th bleed air that is used by their
respective systems. The FMS monitors four different bleed air parameters to calculate the
thrust limit:
S OFF: All engine bleed valves are CLOSED
S 10TH: The engines are supplying the 10th--stage manifold
S COWL: The cowl anti--ice is selected ON
S WG+COWL: The wing and cowl anti--ice is selected ON.
The ENG BLEED line key can be used to observe changes in N1 values for different bleed
configurations. When the ENG BLEED line key selection does not agree with the BLEED
AIR panel switch positions, the active bleed status value is displayed in amber and the N1
limit is not displayed on the primary page.
The EICAS transmits the displayed N1 value to the FMS. If the calculated FMS N1
reference value and the received N1 differs, the N1 reference is removed from the primary
page and a FMS--EFD N1 DISAGREE message is displayed on the CDU.
The temperature from both ADC’s is also compared by the FMS. If the temperature
difference is more than 3 degrees, the N1 reference is removed from the primary page and a
ADC TEMP DISAGREE message is displayed on the CDU.
Through cross--talk capability, the two FMS compare calculated N1 values, If the N1
reference values differ, the N1 reference is removed from the primary page and a FMS--FMS
N1 DISAGREE message is displayed on the CDU. The EICAS also monitors the values
from the two FMS, and if there is a difference, the N1 reference is removed from the primary
page and a FMS--EFD N1 DISAGREE message is displayed on the CDU. <0024>
Vol. 1 20--50--7
REV 56, Jan 31/03
POWER PLANT
Fuel System
Flight Crew Operating Manual
CSP A--013
MASTER
Engine Indication (Fuel) <MST>
Figure 20---50---3
FUEL FILTER (L, R)
Caution (amber)
Comes on to indicate
filter bypass when
pressure drop is
detected across
associated main fuel
filter.
FUEL LO PRESS
(L, R) Caution (amber)
Comes on at 5 psig
to indicate that a low
fuel pressure condition
(at the engine inlet) has
been detected.
Primary Page
<0039>
<0006>
FUEL FLOW L/R
Readout
Indicates rate of fuel
flow:
Green -- 0 to 5000 lb/hr.
(0 to 2270 kilograms
per hour.)
Amber Dashes -- flow
greater than 5000 lb/hr.
(2270 kilograms
per hour.)
<0001>
<0001>
REV 56, Jan 31/03
Vol. 1 20--50--8
POWER PLANT
Fuel System
Flight Crew Operating Manual MASTER
CSP A--013
Engine Indication (N1) <MST>
Figure 20---50---4
Takeoff N1 Readout
(cyan)
Indicates value set at
MENU page (N1
REFERENCE Line), when
airplane is in a
take--off/configuration.
NOTE
N1 bug must be manually
reset for go--around.
N1 bug comes on during
flap or gear extension.
Displayed on ground and
removed automatically
when airplane is at cruise
altitude.
N1 READER/POINTER
TO -- Take--off
GA -- Go--around
ENG OVERSPD
L ENG MISCOMP
R ENG MISCOMP
Primary Page
<0039> <0006>
N1 Bug -- for
CRZ (cyan)
<0039>
N1 REFERENCE
TO -- Take--off
GA -- Go--around
FLEX -- Reduced
thrust take--off.
CLB -- Climb
CRZ -- Cruise
MCT -- Maximum
continuous thrust
TGT -- Manual entry
of target N1.
<0039>
Takeoff N1 Bug (cyan)
N1 Bug <0039>
(magenta -- FLEX)
(cyan -- all other phases).
ENGINE OVERSPD
Warning (red)
Comes on to indicate that an
N1 / N2 limitation is being
exceeded.
<0039>
NOTE
If a data comparator
error is detected, the
FMS CDU will display a
FMS -- EFD N1 DISAGREE
message and N1 bug
information will be blanked.
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