T-45A UJPT, E2-C2, ADV, & IUT Eng-07
Electrical
Overlay 6
5.
Double inverter failure: indications same as
Double Inverter Failure
single inverter loss, except that all AC
services are lost, including HSI
PROGRESS CHECK
Question 3 -- 1.4.4.2.1, 1.4.4.3
What are the indications of an undervoltage unit
failure?
ANSWER: None, unless the generator actually begins
to produce low voltage. The inverters will fail when DC
voltage falls below 16 +/- 1 volts. During engine start
or shutdown the generator will not be online and the
GEN warning light will not be illuminated.
Question 4 -- 1.4.4.2.1, 1.4.4.3
What are the indications of a single inverter
failure?
ANSWER: The AC INVERTER caution light
illuminates and nonessential AC services are lost.
E.
Power system controls, switches, and
Sg 2, fr 8
indicators
P
BATT 1
BATT2
AC RESET
GEN
W
ON
1
RESET
ON
R
29
5
O
1.
PWR panel
N
BA
TTE R
OFF
OFF
2
OFF
a.
Location: right console, both cockpits
P
AC RESET
GEN
W
1
RESET
R
29
5
O
N
BA
TTE R
b.
Function
2
OFF
PWR PANEL
(1) Voltmeter (BATTERY VOLTS):
monitors 28 VDC essential ser-
vices bus and provides
(a) Battery voltage status
indication when generator is
off-line or when starting
aircraft
(8-03) Original
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