Page 3-18 G1000 V8.XX S/W Load and Post Install Checkout – Columbia 350/400
Revision 1 190-00577-04
No. 2 GIA 63
No. 2 GIA 63
ttitude: GRS 77 AHRS
eading: GRS 77 or GMU 44
GDC 74A
Air Data Computer
GTP 59 OAT Probe
or GDC 74A ADC
GTX 33 Transponder
#1 & 2 GIA 63
GPS Receivers in #1, 2 GIA 63
No. 1 & 2 GIA 63
or GEA 71
or Equivalent
Engine/Airframe
Sensors
Figure 3-3. Display Invalid Data Fields
In the normal operating mode, data fields that are invalid have large red X’s through them (Figure
3-3). A valid field does not display a red X. Allow the displays to initialize for approximately one
minute. The GDC 74A requires a longer initialization period than do the other LRUs. During normal
operation, this causes the airspeed, altitude, vertical speed, and OAT fields to be invalid during the
first ~40-60 seconds of PFD power-up.
NOTE
Outputs from the GRS 77 AHRS and GMU 44 are invalid until the units have been
calibrated as described later in this chapter.
10. Verify that all COM/NAV fields are valid in the top corners of the PFD and MFD.
11. Verify that altitude, airspeed, vertical speed and OAT fields are valid on the PFD.
12. Verify that there are no BACKUP PATH alerts on the PFD. If an LRU is not communicating
over its primary path, the BACKUP PATH alert will identify which LRU is having the problem.
Correct the problem before proceeding any further.
13. Verify that engine instrument fields are valid on the MFD.
14. Push the red display backup button on the GMA 1347. Verify both displays enter reversionary
mode: both should have valid altitude, airspeed, vertical speed, and engine instruments.
15. De-activate reversionary mode by pushing the GMA 1347 display backup button again.
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