T-45C TS, ADV & IUT ENG-02
Electrical System
b.
Description
(1) Three essential buses (two AC and one
DC) powered by battery power if generator
fails--e.g., IFF, fire detection, warning and
caution advisory panels, and UHF/VHF #1
(2) Three non-essential buses (two AC and
one DC) drop off the line if the generator
fails
(3) Push-pull thermal circuit breakers of
various amperage levels provide
(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
Overlay 9
D.
Power distribution relays and contactors
Relays and Contactors
1.
Location: under floor equipment compartment
2.
Description: remote logic controlled relays
a.
AC isolation relays disconnect non-essential
services 115 and 26 VAC buses from 115 and
26 VAC essential buses when generator goes
off-line
Original (9-98)
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