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04.10.18 CSP 700.5000.6
FMS Lateral Navigation (LNAV) Mode
The FMS lateral steering command is a roll command which aligns the airplane with the flight plan in the FMS. The FGC limits the FMS roll commands to 30° and roll rate to 5.5°/sec.
The FD will transition automatically from FMS navigation to an approach or back course mode, via the approach preview mode. The selected NAV source must be FMS and NAV radio must be tuned to a localizer frequency, to select an approach preview.
The previewed approach is armed by pushing
or
switch on guidance panel and the
NAV radio must be tuned to a localizer frequency. When
LOC or BC captures, it
replaces LNAV.
If the active vertical mode was not VNAV prior to capture, the vertical mode remains unchanged. If
the active vertical mode was VNAV prior to capture
, then ALT mode will replace
the vertical mode.
If armed approach mode was APR (ILS), then GS is armed with LOC capture
and
GS will capture when GS criteria is met.
Armed.
Active. “LNAV”will flash for approximately 5 seconds, when active.
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual Volume 2
AUTOMATIC FLIGHT CONTROL SYSTEM
LATERAL NAVIGATION MODES (CONT'D)
FMS Lateral Navigation (LNAV) Mode (Cont’d)
LNAV capture will occur when the airplane is within 2.5 miles of the desired track and moving away from it.
PREVIEWED APPROACH
Pointer
Volume 2 Flight Crew Operating Manual
Rev 2A, Apr 11, 2005
Back Course (BC) Mode
Back course mode provides for automatic intercept, capture and tracking of the back course localizer signal.
When BC is armed,
HDG is automatically active
.
BC mode is identical to LOC mode except that the transmitter is located 2000 feet in front of the touch-down point. The course arrow must be set to the front course runway heading. The FGC will invert the course and radio deviation signals to provide correct back course steering commands.
Armed.
Active. “BC”will flash for approximately 5 seconds, when active.
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual Volume 2
AUTOMATIC FLIGHT CONTROL SYSTEM
LATERAL NAVIGATION MODES (CONT'D)
Back Course (BC) Mode (Cont’d)
GF0410_062
BACK COURSE MODE CAPTURE BACK COURSE MODE TRACK
Volume 2 Flight Crew Operating Manual Rev 2A, Apr 11, 2005
The following are vertical modes of operation:
Pitch Hold (PIT)
PIT mode is automatically selected when no other vertical mode is active and the autopilot is engaged and if ROL mode is active and no vertical mode is active. If the pitch angle is greater than 20°, pitch hold mode will reduce the airplane pitch angle to ± 20°. PIT reference is modifiable (within pitch limits), via pilot inputs to the pitch thumb-wheel, or by TCS. There is no speed protection in PITCH mode.
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