constellation. It does not provide an actual integrity
determination at the desired location.
Control Page. The FMS-800 provides access to a
GPS Selective Availability/Antispoofing control page.
From the IDX page, select SA/AS to access the
SA/AS control. From this page, the current status of
GPS receiver keying is displayed, with two selections
for mission duration and SA/AS mode selection. GPS
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
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 Information Radio page via the
NAV function key on the CDU. Refer to Figure 3B-117
and Table 3B -80.
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.
Figure 3B-117. Navigation Radio Information Page
Table 3B-80. 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.
Functionality. Data lines, 2 through 4, displays 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, BC (Back Course)
for an LOC, BC, LDA (Localizer type
Directional Aid), or SDF (Simplified
2. The frequency of the nav aid.