T-45C TS, ADV & IUT ENG-24
GINA Operating Characteristics
INSTRUCTOR NOTES
If the INS is inoperative, the only navigational GPS data
displayed will be GPS coordinates on the ACFT DATA page.
Depending upon exact nature of the INS failure, that data
may/may not be accessible.
H.
Receiver Autonomous Integrity Monitoring (RAIM) GPS
feature
1.
Not available in the current version T-45C GPS
system configuration, but may be included in future
system upgrades
2.
RAIM’s purpose is to determine if a satellite is
providing corrupt information; intentionally or
otherwise
3.
RAIM requires 5 satellites in view (or 4 and baro-
aiding)
4.
To discriminate and remove a “corrupt” satellite from
solution process, RAIM requires 6 satellites in view
(or 5 and baro-aiding)
I.
Differential-GPS for aviation
1.
A type GPS system that produces extremely precise
GPS data to support exact navigation for precision
instrument approaches (PAR)
2.
Differential-GPS is still being developed by
competing manufacturers; FAA has not, yet,
approved/certified any design (as of this writing)
3.
FAA envisions differential-GPS becoming the
primary precision approach navigation aid, replacing
ILS (Instrument Landing System) and MLS
(Microwave Landing System)
4.
Each regional differential-GPS site will include a
ground transmitter that transmits a “differential”
signal to differential-GPS equipped aircraft
Original (9-98)
Page 24-19
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