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detected failure (for all actuators except spoilers). The actuator is still commanded by the other
operating channel(s).
R. SPOIL Xs: A single X is caused by a difference between commanded and actual position or by a
SOV over-current. If a two channel failure (two Xs) was caused by a difference between commanded
and actual position, the FCCs will continue to command the spoilers in both channels. This condition
is indicated by two Xs, a blanked surface position, and no bold surface position X. The vent surface
position value will always be blanked.
S. Blank Surface Position: FCCs and/or MCs unable to report actuator position.
2.10 AFCS - AUTOMATIC FLIGHT CONTROL SYSTEM
The AFCS or ²autopilot² provides three basic functions: pilot relief, coupled steering, and data link
control.
Different pilot relief modes are provided for the pitch and roll axes. Pitch-axis pilot relief modes
include barometric altitude hold (BALT), radar altitude hold (RALT), and flight path attitude hold
(FPAH). Roll-axis pilot relief modes include roll attitude hold (ROLL), ground track hold (GTRK),
ground track select (GSEL), heading hold (HDG), and heading select (HSEL).
Coupled steering modes allow the roll-axis to be coupled to a TACAN station (CPL TCN), to a
waypoint (CPL WYPT), to the azimuth steering line (CPL ASL), or to bank angle (CPL BNK).
Data link control modes include automatic carrier landing (ACL) and vector (VEC).
2.10.1 AFCS Mode Selection. Selection of the various autopilot (A/P) modes is accomplished from
the A/P sublevel of the CNI format on the UFCD. Before any autopilot mode can be selected, bank
angle must be less than 70°, pitch attitude must be less than 45°, and the A/P sublevel must be
displayed on the UFCD. The left column of the A/P sublevel displays the couple (CPL) option and the
pitch-axis pilot relief mode options: BALT, RALT, and FPAH. The right column displays the roll-axis
pilot relief mode options: ROLL, GTRK, and HDG. See figure 2-27.
An autopilot mode is enabled by selecting the corresponding option on the UFCD. Once selected, a
highlighted box appears around the option and the corresponding autopilot advisory appears on the
LDDI. If an option is not available, it is not displayed.
Once in the GTRK mode, subsequent selection of the GTRK option enables the GSEL mode
(²GSEL² replaces ²GTRK² on the UFCD). Once in the HDG mode, subsequent selection of the HDG
option enables the HSEL mode (²HSEL² replaces ²HDG² on the UFCD).
2.10.2 Basic Autopilot. The basic or default autopilot mode is FPAH/HDG. When any autopilot
mode is requested from the UFCD, the AFCS first engages FPAH/HDG and then engages the
requested mode. This makes sure that the AFCS is controlling both the pitch and roll axis whenever
an autopilot mode is engaged.
2.10.3 AFCS Mode Deselection. Autopilot modes can be disengaged by either reselecting (unboxing)
the UFCD option or by actuating the paddle switch. If an autopilot mode is unboxed on the UFCD, the
A1-F18EA-NFM-000
I-2-80 ORIGINAL
Figure 2-27. AFCS Controls and Indicators
A1-F18EA-NFM-000
I-2-81 ORIGINAL
AFCS reverts to the basic autopilot mode in that axis and the AUTO PILOT caution illuminates. If the
stick is moved longitudinally with BALT or RALT engaged or laterally with CPL engaged, the AFCS
reverts to the basic autopilot mode in that axis as the AUTO PILOT caution illuminates. The basic
autopilot mode, however, cannot be disengaged (unboxed) from the UFCD and must, therefore, be
disengaged with the paddle switch. Paddle switch actuation is the only means to make sure that all
autopilot modes have been completely disengaged.
2.10.4 Pitch-Axis Pilot Relief Modes. Any of the pitch-axis pilot relief modes can be engaged in
conjunction with any coupled steering mode (except ACL) or with any roll-axis pilot relief mode.
However, only one pitch-axis mode can be selected at a time. If one pitch-axis mode is requested while
another is engaged, the AFCS switches to the requested mode.
2.10.4.1 BALT - Barometric Altitude Hold. When BALT is engaged, the baro-inertial altitude at the
time of engagement is captured and maintained. While the mode is engaged, this reference altitude
cannot be changed. Longitudinal stick inputs or trim changes disengage BALT, and the AFCS reverts
to FPAH and the selected roll-axis mode.
2.10.4.2 RALT - Radar Altitude Hold. RALT is not available above 5,000 feet AGL. When RALT is
engaged, the radar altitude at the time of engagement is captured and maintained. While the mode is
engaged, this reference altitude cannot be changed. Longitudinal stick inputs or trim changes
disengage RALT, and the AFCS reverts to FPAH and the selected roll-axis mode.
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本文链接地址：
NATOPS Flight Manual 飞行手册 1(72)
