mission duration is entered in days and defines the
expected length of an aircraft mission requiring GPS
keys. If more keys are loaded into the GPS receiver
than are needed, the entry of duration will zeroize the
excess keys. If duration exceeds the availability of
keys, the FMS will annunciate the need to load
additional keys. The duration displayed on the page is
the current duration of the keys loaded into the GPS
When the GPS receiver is configured for Y-
Only mode and no keys are loaded into the
GPS receiver to decrypt the satellite
telemetry, RAIM processing is disabled and
RAIM protection will be unavailable.
The SA/AS mode selection allows the operator
to select between a mixed mode satellite constellation
with both keyed and unkeyed satellite transmissions,
or restrict the receiver to Y -only keyed satellites,
excluding the use of satellites not currently keyed for
P(Y) code encryption.
s. Navigation Radio Information.
(1) Navigation Radio Information Overview.
The FMS-800 provides navigation radio information
upon valid entry of an airport identifier. The crew may
access the Navigation Radio Information page via the
NAV function key on the CDU. Refer to Figure 3C-123
and Table 3C-85.
Selection of the airport identifier, with a valid
airport ID in the scratchpad and loaded on the data
cartridge, will load the airport navigation information of
that airport from the data cartridge. The entered ID will
also be entered on the Communications Radio page.
Functionality. Data lines 2 through 4 display the
1. The name of the approach which
includes the type of NAV aid and the
runway. The possible types of NAV
aids are ILS, LOC, Back Course (BC)
and for an LOC, BC, Localizer type
Directional Aid (LDA), or Simplified
Directional Facility (SDF).
2. The frequency of the NAV aid.
3. The NDB frequency associated with
the approach, i f any. The NDB
frequency is the frequency of a
compass locator at the outer, middle,
or inner marker beacons.
Figure 3C-123. Navigation Radio Information Page
Table 3C-85. Navigation Radio Information
Pressing the function key NAV will
recommended airport navigation aid.
Indicates page 1 of 4.
The NDB frequency.
The frequency of the navigation aid.
The runway ID.
Type of navigation aid.
When a valid airport ID is in the
navigation information for that ID from
the data cartridge.
The airport ID.
(3) Vertical Scrolling. Vertical scrolling has
the following characteristics.
frequency data for other runways and
wrap around in both directions if more
than one page of information exists.
2. Data line 1 will remain fixed during
The frequencies will be displayed in groups of
three per page. A maximum of 12 frequencies or 4
pages may be accessed.