Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Gulfsteam VII 500/600 > Electrical > Flashcards

Electrical Flashcards

1
Q

How is AC power normally produced?

A

By engine driven Integrated Drive Generators (IDG) and/or APU generator.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

How many TRUs convert AC to DC power?

A

Five (5)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What’s the purpose of emergency batteries?

A

They power emergency avionics and emergency egress lighting.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What’s the difference between red and black circuit breakers?

A

Red CBs are related to essential circuits and black CBs are considered non-essential.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What’s the purpose of GCUs?

A

They work with electrical system to provide quality power.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

How can GCU be reset?

A

By cycling associated generator control switch (L GEN, R GEN or APU GEN) to OFF and then ON>

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

True/False: All non-failure AC power transfers are NBPTs, except between external AC power and APU power sources.

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

How is electrical power normally controlled?

A

By two (2) BPCUs, three (3) GCUs and two (2) ESCs
Electrical System Controllers BPCU are brains of system and control most contractors.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Describe emergency batteries.

A

Two(2) lead acid emergency batteries: one located up forward in LEER and one located back aft on left side of baggage compartment in Forward BEER.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What are the three modes of emergency batteries?

A

Like main batteries, they have three (3) modes of operation: charge, discharge, and TR mode.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

How are emergency batteries activated?

A

ON switch is depressed or they’re ARMED and left or right essential DC bus drops below 20 VDC (even momentarily).

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What items are powered down to emergency batteries?

A

Both SFDs without air data TSCs 2 & 3 Back up Eng/Rad Emergency lighting.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

When would MAIN BATTERY switches indicate amber ON?

A

When starting APU (left battery discharge only), operating aux pump, or powering ESS DC buses if MAIN BATTERY switches are selected ON and ESS DC buses have no other source of power.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What additional function does right battery have on ground?

A

It’s used to power ground service bus when not powered by right main DC bus or external DC power.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What are main battery charging requirements?

A

AC power applied.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

When is TR mode intitiated?

A

If battery switches are selected ON, main AC buses are powered, and the following occur - APU start switch is selected ON, aux pump is turned on, or essential DC buses require power from batteries.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What mode of battery/charges is lost with loss of Main AC buses?

A

TR and charge mode.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

The batteries have split bus configuration. What does that mean?

A

Left battery is involved in APU start; both batteries power aux pump.

19
Q

When should you remove batteries?

A

Cold soak conditions (-20 degrees Celsius).

20
Q

On dark airplane, what occurs when EXTERNAL BATTERY switch is selected ON?

A

Power is provided from both main batteries and anti-collision beacon illuminates.

21
Q

What’s the purpose of ground service bus (GSB)?

A

To provide DC power to equipment required for minimal servicing while on ground.

22
Q

What are the sources of power for ground service bus?

A

Right main DC bus, external DC, or right battery.

23
Q

Name the locations of four (4) GSB control switches.

A

One behind cockpit on REER System/Monitor Test panel, one in Security/Gnd Svc panel, one on ground service panel in tail compartment, and one in refuel panel.

24
Q

What happens on dark airplane when GND SVC BUS switch is selected to ON?

A

Right battery powers ground service bus and anti-collision beacon illuminates.

25
Q

There are four (4) GND SVC Bus annunciator lights: one in cockpit, one in Security/GND SVC panel, one in refuel panel, and one on ground service panel in tail compartment. When do they illuminate?

A

When GND SVC BUS is powered by right battery or by external DC power (i.e., other than normal source of power).

26
Q

When is ground service bus automatically deactivated?

A

When all doors are closed: tail compartment door, main door, Security/Gnd Sc panel door, and refuel door.

27
Q

What’s the function of EBHA battery?

A

It’s dedicated source of power of Electric Backup Hydraulic Actuators (EBHAs).

28
Q

What’s the purpose of UPS battery?

A

It’s dedicated source of power to flight control computers.

29
Q

If both AC and DC external power is connected, which has priority?

A

AC

30
Q

Describe APU generator.

A

It’s mounted on APU, is usable on ground or in flight. It’s physically and distinctly different from IDGs but produces same type of power up to 35,000’.

31
Q

What’s the source of power for personal electronic devices, electric razors, hair dryers, blender, toaster, etc.?

A

60 Hz power system compromised of two converters. One converter is active while other is standby.

32
Q

True/False: CABIN/GALLEY and 60 Hz Master switches are wired in series (i.e., both must be selected ON for converters to produce power).

A

True. CABIN/GALLEY Master switch also controls 28 VDC to cabin. It’s single switch for load shedding all power to cabin.

33
Q

What’s the purpose of Secondary Power Distribution System (SPDS)?

A

It takes power from primary power system and distributes it to various aircraft loads.

34
Q

SPDS is composed of two Electrical System Controllers (ESCs) and 14 Modular Power Tiles (MPTs) (4 for AC and 10 for DC). What’s the difference between ESCs and MPTs?

A

ESCs perform system control functions and interface with other aircraft systems. MPTs perform power routing and circuit protection functions using AC and DC Solid State Power Controllers (SSPCs).

35
Q

What causes “AC” or “DC” legend of AC/DC RESET switchlight to activate?

A

Fault in AC or DC bus, logic fault within BPCU, or relay or component failure.

36
Q

What happens when you depress
RESET switch?

A

It resets lockout and allows tripped
contactors to close if fault no longer exists

37
Q

When would you select L/R Bus Tie
to ISLN?

A

When directed by checklist. It prevents associated contactors from closing and isolates respective main AC bus from
other power sources.

38
Q

Describe RAT deployment.

A

It’s totally manual and is accomplished by
pulling guarded RAT DEPLOY handle.

39
Q

What does RAT power once it reaches operating speed (usually 5-8 seconds)?

A

FCC UPS bus and EBHA bus through Emerg AC bus, and both Essential DC buses through Left and Right ESS TRUs

40
Q

How is RAT stowed?

A

On ground using installed hand-operated
piston pump mounted above RAT
assembly: it cannot be stowed in flight.

41
Q

What happens as airspeed falls below
limit of RAT operation (200 knots)?

A

RAT stops operating and Main, UPS and
EBHA batteries begin to power flight
critical systems for up to 10 minutes.

42
Q

When is AUX DC bus load shed or
not powered?

A

During single generator operation, RAT
generator operation, battery only
operation, or when Aux TRU is powering
another DC bus. Load shed feature is
inhibited on ground.

43
Q

Describe purpose of fifth or Aux
TRU.

A

It serves as backup to primary TRUs.
When not serving in backup role, Aux
TRU powers Aux DC bus which provides
28 VDC power to cabin loads.

44
Q

What’s Aux TRU priority?

A

Essential before main and left before right

Gulfsteam VII 500/600 (20 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions