I
3. B. (7) (b)
From the TAS gain programmer, the heading select command is
routed to Figure 259, sheet 4, and is processed as discussed in
paragraph 3.B.(7)(g).
The BANK pushbutton on the GP-820 allows manual control of the
bank angle limit in the heading select mode only. Alternate
activation of the BANK pushbutton causes alternate selection of
a high bank angle limit (28 degrees) and a low bank angle limit
(20 degrees).
Power-up state is high bank angle unless
altitude is greater than 20,000 feet at power-up. Once a bank
angle limit is selected,
it is retained in memory for the
heading select duration of the flight; that is, reselection of
heading select mode will not deselect the bank angle value
stored in memory. When the BANK pushbutton is pressed and
annunciates ON, low bank is selected.
Climbing through 29,500 feet with wings level will
automatically select the low bank angle limit, if it is not
already selected. The low bank angle limit can be reselected
by pressing the BANK pushbutton.
Descending through 28,500 feet with wings level will
automatically select the high bank angle limit if it is not
already selected. The low bank angle limit can be reselected
by pressing the BANK pushbutton.
VOR (LNAV) Mode (See Figure 259, sheet 2.)
The VOR mode provides for automatic intercept, capture and
tracking of a selected VOR radial, utilizing the selected
navigation source displayed on the active PFD and ND. The
navigation source displayed on the PFD and ND is a function of
the NAV source selected on the DC-884 Display Controller.
Prior to engaging the mode, the pilot would perform the
following:
. Tune the navigation receiver to the desired VOR frequency.
● If the station is listed as a VORTAC (combination of VOR and
TACAN), then tune the DME receiver to the station frequency
to obtain distance to the station information.
.
Set the course pointer for the desired course to be flown
toward or away from the station.
● Set the heading bug for the desired heading intercept for
the selected course, since the heading select mode is used
to achieve the VOR intercept.
● Select NAV 1 or NAV 2 as the navigation source on the DC-884
Display Controller.
22-14-00
Page 298.88
Apr 15/93
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