Electrical

Question 1

Where is the ELEC power panel located?

Answer 1

The overhead panel

Question 2

How are the main AC generators cooled and lubricated?

Answer 2

Aft trans main oil/lube system

Question 3

The GCUs protect the AC system from what four conditions?

Answer 3

Over-voltage
under-voltage
Under-frequency (RRPM)
Feeder Fault (Short/open circuit)

Question 4

Where are the No. 1 and No. 2 auxiliary PDPs located?

Answer 4

Cabin (mid-point)

Question 5

How is the APU generator cooled?

Answer 5

Air cooled

Question 6

An indicator on the center instrument panel indicates when the battery voltage drops
below ___ V dc.

Answer 6

20

Question 7

What is the purpose of the AC bus-tie gang bars on each PDP?

Answer 7

isolate respective system and prevent “bus-tie” from occurring to the other side

Question 8

With the BATT switch in OFF position, the battery supplies DC electrical power only
to the _____ bus.

Answer 8

Battery

Question 9

The battery bus can be energized by what two sources of DC electrical power?

Answer 9

Battery and No. 1 DC bus

Question 10

What components provide electrical power to the No. 1 and No. 2 DC buses?

Answer 10

Transformer rectifier

1&2

Question 11

What is the order of priority for the DC electrical system from highest to lowest?

Answer 11

Transformer rectifier
external DC power agpu
battery

Question 12

True or False? The battery switch (BATT) must be in the ON position in order to recharge or maintain the charge of the battery.

Answer 12

True

Question 13

What three DC buses are powered by the battery with the BATT switch in the ON position?

Answer 13

Batt Bus
Essential 1
Essential 2

Question 14

If the APU is running or external AC power is connected, DC power is supplied by
the helicopter ___.

Answer 14

Transformer rectifier

Question 15

What is the order of priority of power for the AC electrical system from highest to
lowest?

Answer 15

Main AC Generators
APU Generator
External AC power

Question 16

What “system” allows either main generator to provide electrical power to both buses should a single generator fail or be taken off-line?

Answer 16

Bus-tie system

Question 17

If all three generator switches are placed to the ON position (No.1, No. 2 main, and APU) which one(s) will provide electrical power to the No. 1 and No. 2 AC buses?

Answer 17

Each main AC gen will provide power to its respective bus. APU gen power will not be connected to the bus

Question 18

The primary active caution messages to look for in determining whether or not a
bus-tie exists are the respective RECT FAIL (OFF), ENG FUEL PESS LO, and
______________.

Answer 18

AFCS 1 (2) FAIL

Question 19

Should both generators fail, both rectifiers will be _________.

Answer 19

Disabled

Question 20

What will be the indication if a bus-tie DOES NOT exist when a RECT1 or RECT2
OFF becomes active?

Answer 20

Along with aforementioned cautions, these other respective coutions may also become active: AFCS FAIL and ENG FUEL PRESSURE LO

Question 21

What indication will you have that a bus-tie DOES exist during a single generator
failure?

Answer 21

Should be no other cautions besides appropriate GEN caution

Question 22

What is the procedure (first underlined step) for both RECT1 OFF and RECT2 OFF
cautions active?

Answer 22

Land as soon as possible

Question 23

How many phases do the main generators have?

Answer 23

3. Phase A, B, and C operating at 400 Hz

Question 24

What kind of battery does the chinook have?

Answer 24

Sealed lead acid battery (SLAB)