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APPR (approach) button — The APPR mode is used for all approaches, regardless of NAV source or whether a vertical mode is also associated with the approach. Pressing the APPR button arms both localizer and glideslope modes and is normally used to select lateral and vertical steering for ILS and FMS. The VOR approach mode is selected by pressing the APPR mode button with the navigation receiver tuned to a VOR frequency and selected as the active nav source. When the navigation receiver is tuned to an ILS frequency, ILS is selected as the active navigation source. Selection of APPR mode when the NAV source is FMS engages the FMS lateral mode the same as described for NAV, and also arms VNAV for approach.
B/C button — The back course button is used to alternately select and deselect the back course mode for flying a localizer back course approach.
1/2 BANK button — Pressing this button alternately selects or deselects a reduced maximum bank angle of 15° (for all lateral modes, except roll) on both FDs. When selected, a green 1/2 bank arc appears on the top of the attitude direction indicators.
FLC (flight level change) button — Depressing the FLC button engages the flight level change mode, which sycronizes on engagement to the current airspeed/mach. The speed reference can then be changed with the SPEED knob. Pushing the FLC switch again disengages the mode.
Volume 2 Flight Crew Operating Manual Sep 13/2004 CSP 100-6 REV 1
04-01-04
FLIGHT GUIDANCE PANEL (FGP) (Cont)
SPEED knob — The rotary SPEED knob changes the IAS/Mach speed reference (FLC mode). The speed knob changes the bug airspeed or Mach at any time. The integral PUSH IAS/MACH button within the SPEED knob toggles the airspeed tape between IAS and Mach. The master flight director computes the airspeed reference, and the slave flight director syn-chronizes to this reference.
VS button — The VS switch selects vertical speed mode. When activated, the system maintains the vertical speed refer-ence. The vertical speed reference is set to the current vertical speed at the time of mode selection. After mode selection, rotation of the DOWN/UP wheel slews the vertical speed reference in the direction of knob rotation. Range is ±8000 fpm.
VNAV (vertical navigation) button — Pressing the VNAV button arms and then captures the FMS pitch steering com-mands of the FDs if FMS is selected as the NAV source, the FMS is programmed for a vertical navigation profile, the alti-tude preselector is set below existing altitude, and the aircraft is within the TOD (top of descent) window or above the existing altitude for VNAV climb (i.e. VFLC).
ALT (altitude hold) button — Altitude hold may be engaged by depressing the ALT button on the FGP. When ALT engages, the FD holds the existing altitude at the time the ALT button was pushed except during a precision approach with the glideslope captured.
ALT (altitude select) knob — A preselected altitude is set via the ALT rotary knob. The altitude preselect mode provides a means for FD/AP to climb or descend to a preselected altitude and then level off and maintain the preselected altitude. If an altitude deviation (±200 ft) has occurred, the altitude preselect digits will turn amber and flash, press the PUSH CAN-CEL button in the center of the ALT knob to cancel the flashing. The digits will then revert to cyan.
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