T-45C TS, ADV & IUT ENG-24
GINA Operating Characteristics
(8) This specific 3-sigma self-test and the
removal of display data will not occur if less
that four (4) satellites are locked-on
b.
If GPS data is bad
(1) HUD and MFD displays will lose previously
noted display items after a three (3) sigma
deviation
(2) GINA reverts from HYBD to INS mode
(a) INS will box on the ADI
(b) HYBD legend will be removed from
ADI
(c) GPS legend will be removed from ADI
(3) Check BIT page
(4) Check ACFT DATA page
(a) Number of satellites locked-on
INSTRUCTOR NOTE
GINA automatically reverts from HYBD to INS mode when all
four (4) satellite lock-ons are lost for more than 65 seconds
(b) Coordinates on ACFT DATA page
continue being computed with pure
INS data, provided INS is functional,
commencing at time of GPS loss
(c) Compare GPS coordinates on the
ACFT page with INS mode
coordinates, if possible
Original (9-98)
Page 24-47
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