Garmin G2000 - Page 54

Garmin G2000 Pilot’s Guide for the Cessna T240
190-01263-01 Rev. A40
SyStem Overview
SyStem
Overview
FLiGHt
iNStrUmeNtS
eiS
AUDiO PANeL
& CNS
FLiGHt
mANAGemeNt
HAZArD
AvOiDANCe
AFCS
ADDitiONAL
FeAtUreS
APPeNDiCeSiNDeX
SyStem
Overview
FLiGHt
iNStrUmeNtS
eiS AUDiO & CNS
FLiGHt
mANAGemeNt
HAZArD
AvOiDANCe
AFCS
ADDitiONAL
FeAtUreS
APPeNDiCeSiNDeX
RAIM (RECEIVER AUTONOMOUS INTEGRITY MONITORING) PREDICTION
In most cases performing a RAIM prediction is not necessary. However, in some cases, the selected approach
may be outside the SBAS coverage area and it may be necessary to perform a RAIM prediction for the intended
approach.
Receiver Autonomous Integrity Monitoring (RAIM) is a GPS receiver function that performs a consistency
check on all tracked satellites. RAIM ensures that the available satellite geometry allows the receiver to
calculate a position within a specified RAIM protection limit (2.0 nautical miles for oceanic and enroute, 1.0
nm for terminal, and 0.3 nm for non-precision approaches). During oceanic, enroute, and terminal phases of
flight, RAIM is available nearly 100% of the time.
The RAIM prediction function also indicates whether RAIM is available at a specified date and time. RAIM
computations predict satellite coverage within ±15 min of the specified arrival date and time.
Because of the tighter protection limit on approaches, there may be times when RAIM is not available. The
system automatically monitors RAIM and warns with an alert message when it is not available. If RAIM is not
predicted to be available for the final approach course, the approach does not become active, as indicated by
the messages “Approach is not active” and “RAIM not available from FAF to MAP”. If RAIM is not available
when crossing the FAF, the missed approach procedure must be flown.
Predicting RAIM availability:
1) From the Home, touch Utilities > GPS Status > Location.
2) Touch the Waypoint Button to enter the location for which RAIM will be predicted. Touch the Present
Position Button to enter the aircraft’s current position as the prediction location.
3) If the Waypoint Button was touched in step 2, enter the waypoint identifier using the alphanumeric buttons.
If the Present Position Button was touched in step 2, proceed to step 5.
4) Touch the Enter Button.
5) The location selected for RAIM prediction is now displayed on the Location Button.
6) Touch the Arrival Time Button.
7) Enter the planned arrival time for the selected location using the numeric buttons
8) Touch the Enter Button. The time is now displayed on the Arrival Time Button.
9) Touch the Arrival Date Button.
10) Touch the button for the desired year. If necessary, touch and drag in the window, or use the Up and Down
buttons to display the desired year.
11) Touch the button for the desired month. If necessary, touch and drag in the window, or use the Up and Down
buttons to display the desired month.
12) Touch the button for the desired day. If necessary, touch and drag in the window, or use the Up and Down
buttons to display the desired day. The selected date is now displayed on the Arrival Date Button.
13) Touch the Compute RAIM Button. One of the following will be displayed in the RAIM Status field.
• ‘Computing’—RAIM calculation in progress
• ‘Available’—RAIM is predicted to be available for the specified waypoint, time, and date
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