T-45A UJPT, E2-C2, ADV, & IUT Eng-26
Engineering Review
C.
Refueling restrictions
1.
Refueling must be stopped immediately if
fuel is discharged through main vent above
tail cone
2.
Refueling pressure not to exceed 50 psi
3.
Refueling flow rate not to exceed
180 US gal/min
4.
Aircraft must be grounded during refueling
procedure; refueling truck must also be
grounded
Sg 3, fr 1
Lesson Organization
III. Electrical system
Sg 3, fr 2
A.
Power generation and control
1.
Generator: main source of DC power
2.
Batteries: provide DC power to start
aircraft, emergency power if generator fails
NOTE: In the event of a generator failure,
ELECTRICAL SYSTEM
two good batteries will give power for
BLOCK DIAGRAM
approximately 27 minutes. With only one
good battery, power will be available for
12 minutes.
3.
Inverters: convert aircraft 28 VDC to
115 VAC and 26 VAC, 400 Hz, single-
phase power
4.
Voltage regulator: controls generator by
maintaining output
B.
Electrical system operational characteristics
1.
DC power system: consists of two
batteries, generator, voltage regulator,
overvoltage unit, undervoltage unit, and
two 28 VDC buses (163600 through
163646 before AFC-36), or three 28 VDC
Page 26-17
(8-03) Original
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