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Approach (LOC/GS, VAPP) Modes
The approach mode provides for automatic intercept, capture and tracking of the front course localizer and glideslope signals which enables the pilot to fly a fully coupled ILS approach. APR modes are based on vertical path deviation and valid glideslope on the selected PFD.
When APR mode is armed
, HDG is automatically active
.
ILS
ILS lateral/vertical capture and tracking is established, based on data from selected PFD.
The lateral beam must be captured before the vertical beam in order to prevent inadvertent descent.
Distance and beam width estimates for the vertical axis are :
. The vertical distance is based on radio altitude information. If radio altitude information is not available, the distance estimate is based on vertical speed, middle marker beacon and an assumed initial altitude of 1500 feet. The beam width is based on the estimated distance, glideslope deviation, airspeed and an assumed glideslope angle of 3°. The beam width is fixed at ± 1°.
Tracking performance for glideslope mode is within ± 1 dot from 700 to 100 feet (radio altimeter).
ASEL is inhibited during glideslope capture.
During a CAT 2 approach, EFIS will monitor for excessive deviation from the beam and will provide appropriate annunciation. The outputs provided by AFCS (used by EFIS) in the determination of CAT 2 status are glideslope arm or capture and dual couple status. A valid CAT 2 status is indicated on the PFD. A CAT 2 window also appears to display deviation from the beam. The fully coupled (dual arrow) ILS approach becomes active when the aircraft is below 1200 feet AGL.
CAT 2
Window
GF0410_091
VOR Approach (VAPP) Mode
VOR approach mode is identical to VOR mode except that, with flaps other than zero, the FGC sets bank limits and rate limits to ensure proper gain control and performance from VOR capture through the approach profile, to landing. FD roll commands are ± 30° during VOR approach capture and roll rate commands 7°/sec. When track phase is active, FD commands are ± 14° and roll rate commands 4°/sec.
Volume 2 Flight Crew Operating Manual Rev 3, Apr 25, 2005
AUTOMATIC FLIGHT CONTROL SYSTEM
MULTI-AXIS MODES (CONT'D)
Approach Mode
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual Volume 2
CSP 700.5000.6 04.10.29
TAKE-OFF (TO) MODE
TO mode provides pitch and lateral commands during the take-off phase of flight.
TO mode is activated by pushing one of the throttle-mounted TOGA buttons, while on the ground. When TO mode is selected, all other lateral and vertical modes are cleared.
TO mode is a heading submode of ROL. TO mode will track the current heading at the time the airplane passes 80 KIAS during the take-off roll.
Vertical TO mode generates a fixed pitch attitude of 17.5°, based on power being developed by the engines. In the event of a loss of an engine, (N1 <70% on either engine), the pitch command will be reduced to 13°.
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