T-45C TS, ADV & IUT ENG-27/ENG-28
Engineering Review
(i)
HYBD (hybrid) mode, the most
accurate mode. Attitude and
position data provided by inertial
system and GPS. Automatically
selected on initial power-up and
weight-on-wheels or manually
from the ADI display
(ii) GPS mode, position data provided
by embedded GPS receiver
automatically selected when in
HYBD or INS and inertial system
not available or manually when
selected from ADI display
(iii) INS mode, position data provided
by inertial system, automatically
selected when in HYBD or GPS
and GPS fails or manually when
selected from ADI display
(iv) DGRO (directional gyro), an
attitude heading backup mode,
automatically commanded when
insufficient initialization data or the
parking brake is not set during
alignment or manually when
selected from ACFT DATA
display
(c) GINA alignments
(i)
Two stages of alignment, coarse
and complete/fine
(ii) Ground alignment, GINA align
complete takes approximately
3 minutes after present position
initialization
(iii) In-flight alignment, GINA align
complete takes between 15 and
22 minutes when using a straight
and level profile, maybe less if S
turns incorporated
(9-98) Original
Page 27-100
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