T-45A UJPT, E2-C2, ADV, & IUT Eng-19
Flight Instruments
c.
TACAN FAIL: TACAN RANGE and
NAV flags displayed, No. 2 pointer and
CDI failed, and TO-FROM indicator out
of view on HSI
d.
VOR FAIL: No. 1 pointer and CDI
failed, TO-FROM indicator out of view,
and NAV flag displayed on HSI
e.
ILS FAIL: No. 1 pointer and CDI failed,
TO-FROM indicator out of view on HSI,
GS pointer failed, and GS and OFF
flags displayed on ADI
C.
Summary:
The flight instrument system receives electrical,
SAHRS/NGS, pitot static, COMM/NAV/
Instruments (CNI), and acceleration inputs,
28 VAC essential bus and 5 VAC nonessential
bus inputs.
Electrical inputs are from the 28 VDC essential
services bus, the 115 VAC essential and
nonessential buses, the 26 VAC essential and
nonessential buses, and the 28 VDC generator
bus. SAHRS/NGS provides heading, pitch, and
roll information to the ADI and heading
information to the HSI. The pitot static system
provides static and ram air pressure to the
airspeed, altitude, and vertical speed indicators.
The acceleration sensors provide vertical
negative- and positive-g loads to the
The CNI system provides navigational inputs to
the ADI and HSI in the form of TACAN, VOR,
ILS glideslope, and ILS localizer information.
(8-03) Original
Page 19-35
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