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2.10.4.3 FPAH - Flight Path Angle Hold. When FPAH is engaged, the flight path angle at the time
of engagement is captured and maintained. This reference flight path angle can be changed by
longitudinal stick inputs (stick sensitivity similar to CAS) or by pitch trim changes (2°/sec in flaps
AUTO or 0.5°/second in flaps HALF or FULL). When pilot inputs cease, the flight path attitude at
release is captured and maintained.
2.10.5 Roll-Axis Pilot Relief Modes. Any of the roll-axis pilot relief modes can be engaged in
conjunction with any pitch-axis pilot relief mode. However, only one roll-axis mode can be engaged at
a time. If one roll-axis mode is requested while another is engaged, the AFCS switches to the requested
mode.
2.10.5.1 ROLL - Roll Attitude Hold. When ROLL is engaged, the roll attitude at the time of
engagement is captured and maintained. This reference roll attitude can be changed by lateral stick
inputs or roll trim changes (stick and trim sensitivity similar to CAS). When pilot inputs cease, the roll
attitude at release is captured and maintained.
2.10.5.2 GTRK - Ground Track Hold. When GTRK is engaged, aircraft response depends on the roll
attitude at the time of engagement. If roll attitude is less than ±5°, ground track is captured and
maintained. If roll attitude is greater than or equal to ±5°, roll attitude is captured and maintained.
While in GTRK, the aircraft responds to lateral stick or roll trim inputs (stick and trim sensitivity
similar to CAS). When pilot inputs cease, GTRK holds roll attitude (if greater than or equal to ±5°)
or ground track (if less than ±5°).
2.10.5.3 GSEL - Ground Track Select. The desired ground track angle is selected by slewing the
command heading marker with the HDG/TK switch, located to the left of the MPCD. When GSEL is
engaged, the aircraft turns from the existing ground track through the smallest angle to the selected
ground track. While in GSEL, the aircraft responds to lateral stick inputs. However, the selected
ground track angle is not changed by stick inputs, so the aircraft returns to the selected ground track
angle upon stick release.
A1-F18EA-NFM-000
I-2-82 ORIGINAL
2.10.5.4 HDG - Heading Hold. When HDG is engaged, aircraft response depends on the roll attitude
at the time of engagement. If roll attitude is less than ±5°, magnetic heading is captured and
maintained. If roll attitude is greater than or equal to ±5°, roll attitude is captured and maintained.
While in HDG, the aircraft responds to lateral stick or roll trim inputs (stick and trim sensitivity
similar to CAS). When pilot inputs cease, HDG holds roll attitude (if greater than or equal to ±5°) or
magnetic heading (if less than ±5°).
2.10.5.5 HSEL - Heading Select. The desired heading is selected by slewing the command heading
marker with the HDG/TK switch, located to the left of the MPCD. When HSEL is engaged, the
aircraft turns from the existing heading through the smallest angle to the selected heading. While in
HSEL, the aircraft responds to lateral stick inputs. However, the selected heading is not changed by
stick inputs, so the aircraft returns to the selected heading upon stick release.
2.10.6 CPL - Coupled Steering Modes. The coupled steering modes couple the aircraft in the
roll-axis only. If the CPL option is selected, the AFCS disengages any currently engaged roll-axis pilot
relief mode. The AFCS has the ability to couple to the following sources: a waypoint, waypoint
courseline, or offset aimpoint (CPL WYPT); to a TACAN station or TACAN courseline (CPL TCN);
or to an auto sequence (CPL SEQ#). Refer to chapter 24 for detailed navigation steering information
on waypoint/OAP, auto sequential, and TACAN steering.
2.10.7 Coupled Data Link Modes. The AFCS can couple to data link commands in one of two modes:
ACL and VEC. With ACL boxed on the HSI format, the CPL P/R option appears on the A/P sublevel
when pitch/roll couple capability is available. Selecting the CPL P/R option couples the aircraft to
pitch and roll commands for a Mode 1 carrier approach. With VEC boxed on the HSI format, selecting
the CPL option couples the aircraft (roll-axis only) to data link steering commands. Refer to chapter
24 and the Tactical Manual for detailed information on the ACL and VEC modes.
2.10.8 AFCS Related Caution and Advisories. The AUTO PILOT caution and the following AFCS
related advisories are described in the Warning/Caution/Advisory Displays in Part V:
· BALT
· CPLD
· FPAH
· GSEL
· GTRK
· HDG
· HSEL
· RALT
· ROLL
2.11 WEAPON SYSTEMS CONTROLS
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NATOPS Flight Manual 飞行手册 1(73)
