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option on the SUPT MENU. For FCS components/functions which are displayed in the matrix, an ²X²
is displayed in the failed channel(s) along with a corresponding BLIN code. For FCS components/
functions which are not displayed in the matrix, BLIN codes are the only indication of failure location.
A. Surface Position: In degrees from streamline for all surfaces. Tolerance is ±1° for all surfaces.
B. Surface Arrow: Direction of surface deflection relative to the surface hinge point except for
stabilators. For stabilators, surface arrow indicates trailing edge position.
C. Column of Xs: An entire FCC channel is failed due to a processor fault or loss of power.
D. Bold X across surface position: Surface failed; FCCs are no longer commanding movement of
that surface in any channel.
E. G-LIMX.XG: ²X.X² is the current Nz REF value as calculated by the MC. This value is
decremented if in the transonic g-bucket. INVALID is displayed in this position if the interface
between FCC CH 1, FCC CH 3, and the MC is invalid. In this case, all data on the display is invalid.
During FCS IBIT, G-LIM0.0G is displayed in this position.
F. Bold X over G-LIMX.XG: Nz REF data from the MC is invalid or out of range, and Nz REF has
defaulted to +7.5g. This X also appears when gross weight is above 57,405 lb, indicating that Nz REF
has been set to +5.5 g even though this may result in an overstress.
Figure 2-26. FCS Status Display
A1-F18EA-NFM-000
I-2-78 ORIGINAL
G. BLIN Codes. Up to eight FCC BLIN codes are displayed in octal format for each channel. The
codes are displayed in the order of occurrence. If the list exceeds eight, additional codes may be viewed
with a memory inspect of unit 14 or 15 with address 2253.
H. BLIN Code Channel: The FCC channel corresponding to the list of BLIN codes. The channel is
incremented from 1 through 4 and back to 1 by selecting the BLIN option.
I. L/R XX.X: FCC air data function corrected true AOA for the left and right AOA probes (see AOA
Select in paragraph K below).
J. AOA XX.X: True AOA based on INS data. INS true AOA is displayed for reference only to aid the
pilot in determining which AOA probe is valid when one is damaged. INS true AOA is normally boxed,
indicating that an average of the left and right probes has been selected for display in the HUD and
for use by the AOA indexer lights and approach lights.
K. AOA Select: The AOA option is displayed only when GAIN ORIDE is selected. If one AOA probe
is damaged, the AOA option can be used to select output from the good probe for display in the HUD
and for use by the AOA indexer lights and approach lights. AOA probe selection does not affect the
fixed gains used by the FCCs in GAIN ORIDE.
NOTE
If a single probe is declared invalid (a two channel AOA failure), and
that probe is selected, the AOA indexer lights and the HUD AOA will
be blanked immediately.
L. DEGD Xs: An FCC channel failure has occurred in the Xd channel that is not covered by other
matrix Xs. BLIN codes should be used to determine the degraded FCC channel function.
M. PTS Xs: The static or total pressure data is failed in the Xd channel. If a three channel PTS
failure occurs (three Xs), the FCC control laws use data from the remaining PTS channel. If a total
PTS failure occurs (four Xs), the FCCs use fixed PTS values. If a PTS failure clears, PTS Xs are
removed automatically with or without an FCS RESET attempt.
NOTE
With a four channel PTS failure, HUD airspeed and altitude will be
blanked.
N. AOA Xs: AOA data failed in the Xd channel. A three or four channel AOA failure sets four Xs
(total AOA failure). In UA, P CAS uses the AOA estimator for control law scheduling. If a UA failure
clears, AOA Xs are removed automatically with or without an FCS RESET attempt. In PA, P CAS uses
a fixed 8.1° AOA value, and R CAS uses the AOA estimator for control law scheduling. If a PA failure
clears, AOA Xs are not removed until an FCS RESET is attempted.
O. Sensor Xs (CAS P, R, or Y; N ACC, L ACC, STICK, or PEDAL): The corresponding sensor
(rate gyros, normal or lateral accelerometers, stick or pedal position) is failed in the Xd channel. A
three or four channel sensor failure sets four Xs (total sensor failure). However, for a three channel
failure, the FCCs average the remaining channel with the last channel that failed. For N ACC and L
ACC only, the FCCs will use a single channel if the signal from the third failed channel exceeds 90%
of full range.
A1-F18EA-NFM-000
I-2-79 ORIGINAL
P. 1 2 3 4: Column legends for each FCC channel. FCC A contains channels 1 and 2 while FCC B
contains channels 3 and 4.
Q. Actuator Xs: The actuator is no longer commanded by the FCC in the Xd channel due to a
　
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