T-45A UJPT, E2-C2, ADV, & IUT Eng-07
Electrical
(a) Bus connection for aircraft
electrical systems
(b) Isolation/protection for their
respective functions in the
event of electrical failures
PROGRESS CHECK
Question 2 -- 1.4.4.3.1
Which electrical component monitors generator
voltage and takes the generator off-line if output
voltage exceeds 30.2 VDC?
ANSWER: Overvoltage unit
D.
Power distribution relays and contactors
Overlay 9
Relays and Contactors
1.
Location: under floor of equipment
compartment
2.
Description: remote logic-controlled relays
a.
AC isolation relays disconnect
nonessential services 115 and 26 VAC
buses from 115 and 26 VAC essential
buses when generator goes off-line
b.
Three contactors provide bus
connection to battery and external
power
(8-03) Original
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