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Part 121 - CRJ 701/900 > Fire Protection and APU > Flashcards

Fire Protection and APU Flashcards

1
Q

True or False: During normal operations, both detection loops must detect a fire before a warning is generated

A

TRUE

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2
Q

______ Halon Bottle(s) are installed in the aft equipment bay for engine fire suppression for the main engines

A

2

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3
Q

If an APU fire occurs in flight, what will happen?

A

The APU shuts down automatically, but the fire extinguishing bottle must be manually discharged

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4
Q

If an APU fire is detected while on the ground, what will happen?

A

The APU will automatically be shut down and it’s bottle will be AUTOMATICALLY discharged.

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5
Q

Fire Extinguishing for the forward and aft cargo compartments is provided by:

A

Two halon fire extinguisher bottles

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6
Q

When a cargo fire is extinguished, what will happen?

A

Both bottles will simultaneously discharge into the selected compartment. The high rate quickly discharges, the low rate will slowly discharge over a 60 minute period

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7
Q

What are the flight deck indications that the lavatory waste bin extinguisher has been discharged?

A

There are no flight deck indications that the bottle has been discharged

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8
Q

What happens when I push the engine fire switch light?

A
  1. Bottle squibs are armed (green light)
  2. Closes the Bleed air SOV (ECS on EICAS status)
  3. Closes the Hydraulic SOV (HYD on EICAS status)
  4. Trips off the affected engine generator (ELEC)
  5. Closes the Fuel SOV (FUEL)
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9
Q

How can the APU be shut off?

A
  1. START/STOP
  2. AC External Panel
  3. Emergency Stop in Tail Compartment
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10
Q

What accessories are mounted on APU gearbox?

A

Fuel Control Unit (FCU)

Lubrication Module

Electric Starter/Generator

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11
Q

APU door position depends on:

A
  1. Weight on Wheels
  2. APU RPM
  3. Aircraft Speed
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12
Q

The APU OVERSPEED EICAS warning will appear if APU RPM is greater than ______

A

106%

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13
Q

Fuel from the APU operation is supplied from the:

A

Left Collector Tank

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14
Q

The ECU will shut down the APU for:

A

Overspeed and loss of overspeed protection

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15
Q

What is the APUs primary and secondary purpose?

A

Primary: provide AC Power
Secondary: Bleed air

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16
Q

APU Model

A

Honeywell RE220

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17
Q

What happens when PWR FUEL light is pressed?

A
  1. APU fuel pump energized
  2. APU Shut-off valve opens
  3. APU EICAS gages and APU IN BITE message are displayed.
  4. ON THE GROUND, air inlet door is scheduled to open
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18
Q

Describe APU starter.

A

DC Starter

AC Generator

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19
Q

What happens when the APU START/STOP switchlight is pressed?

A

ECU will…

  1. Energize starter motor
  2. Fuel and ignition on at 5%
  3. 46-60% rpm (altitude dependent)
  4. At 99% rpm + 2 seconds, the green AVAIL switchlight illuminates.
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20
Q

What will cause an APU fault message?

A

HOTLOP

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21
Q

What happens when the APU START/STOP switchlight is pressed while the APU is running?

A
  1. Green AVAIL switchlight extinguishes
  2. APU fuel shutoff solenoid closes
  3. APU RPM and EGT decrease
  4. APU intake door closes when rpm decreases below 25% rpm
  5. EICAS parameter DOOR CLSD displayed
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22
Q

Why can the APU indicate low oil pressure at higher altitudes?

A

APU is not pressurized, can cause foaming of oil at higher altitudes.

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23
Q

How does the ECU close the APU solenoid fuel SOV?

A

By generating an artificial overspeed signal.

24
Q

How is the APU fuel SOV held open?

A

Electronically. It is spring loaded closed.

25
Q

How many pounds per hour for the APU?

A

220lbs per hour.

26
Q

What happens when I push the PWR/FUEL switch light?

A

DIGS

Door
In Bite - status (built in test equipment)
Gauges - appear on status page
SOV (fuel)

27
Q

2 ways to tap bleed air off the APU.

A
  1. Load Control Valve (LCV)

2. Surge Control Valve (SCV)

28
Q

How does the APU prioritize electronics vs pnematics?

A

By varying the position of the LCV to unload the APUs pneumatic output to accommodate it’s electrical output.

29
Q

What battery is required to start and operate the APU?

A

Both batteries.

30
Q

What does AVAIL mean on the APU PANEL?

A

APU Generator is ready to load.

31
Q

How do you know if the PWR FUEL switchlight is not energizing the ECU?

A

The APU Gauges are removed from EICAS.

32
Q

Maximum altitude for bleed air extraction.

A

(ECS) 25,000’

(MES) 21,000’

33
Q

Will the APU run the Anti-icing system?

A

No, it does feed the same manifold, but control system logic will not let that occur.

34
Q

APU BLEED ON

A

If you have APU manually selected to be used for the packs above 25,000’

35
Q

When is the only time the APU SOV is automatically controlled?

36
Q

What is the ECU powered off of?

A

the BATT BUS.

37
Q

The APU starter is powered by the

A

APU BATT DIR BUS

38
Q

When does the APU door open?

A

On the ground when the PWR/fuel button is switched.

In the air when the start button is switched

39
Q

Before commencing the fire test, we should ensure that __________ message is not displayed.

A

APU FIRE FAIL.

40
Q

If the APU FIRE FAIL message is displayed during the acceptance flow, what should we do?

A

DON’T carry out fire detection test, DON’T start the APU, DO advise MX.

41
Q

Why does the APU EGT rise when the LCV is open?

A

There is more APU bleed being diverted to the Bleed Air manifold and therefore less air available for cooling.

42
Q

What is the purpose of the APU SCV?

A

The surge control valve bleeds off varying amounts of compressor air to ambient to prevent compressor surge or stall.

43
Q

When does the SCV function?

A

Only in flight with the LCV closed. So in an “unloaded bleed air condition.”

44
Q

APU ALT LIMIT on status page indicates what?

A

APU operation is now limited to 17,000’ because the SCV closed.

45
Q

You want to start the APU. You press the “PWR/FUEL” switch light, what happens?

A
  1. ECU Powered
  2. Air Inlet Door Opens (ONLY ON THE GROUND)
  3. APU Fuel SOV Opens
  4. APU RPM & EGT Gauges Display
  5. APU Fuel Pump comes on

“ED’S REP”

E: ECU Powered
D: DOOR Opens
S: Fuel SHUTOFF valve opens
R & E: RPM and EGT gauges display
P: APU fuel PUMP comes on
46
Q

You want to start the APU, and already pressed the “PWR/FUEL” switchlight and now press the “START/STOP” switch light, what happens?

A
  1. APU starter motor energizes
  2. Start Light illuminates
  3. APU START status message
  4. FCU Fuel Solenoid Shut Off Valve Opens
  5. Ignition is activated….
  6. Starter disengages 46%-60%RPM
  7. Start Light extinguishes,
  8. Start messages is removed
  9. 2 Seconds after APU reaches 99% RPM, “AVAIL” light comes on

“Start Start Start Fuel Bang, Start Start Start AVAIL”

47
Q

What does the “AVAIL” light tell you?

A

The APU is ready for electrical loading.

48
Q

You’re ready to shutdown the APU so you press the “START/STOP” switchlight, what happens?

A
  1. AVAIL light goes away
  2. APU generates artificial overspeed signal and shuts down
  3. 25% RPM: Intake door closes
  4. Door closed status message appears
49
Q

You’re done with the APU, just pressed the “START/STOP” switch light and now press the “PWR/FUEL” switchlight. What happens?

A
  1. APU FUEL SOV closes
  2. Primary power to the ECU is removed
  3. 10 seconds after pressing, RPM and EGT are removed from the status page.

“FERES”
F: Fuel SOV closes
E: ECU shutoff

10 seconds after pressing…

R: RPMs and..
E: EGT displays removed from
S: STATUS page

50
Q

APU will not start if rotating at _________ on the ground and ________ in flight.

A

ON GROUND: 5% RPM

IN FLIGHT: 12%

51
Q

The Surge control valve is automatically controlled by the ECU and is commanded open when the APU is supplying electrical loads at flights above:

52
Q

On the PWR/FUEL switch light, the “PUMP FAIL” message illuminates, what does this mean? What about the “SOV FAIL”?

A

Pump Fail: Failed APU fuel pump.

SOV Fail: Failed APU fuel feed shut off valve.

53
Q

APU make and model.

A

Honeywell RE220 (RJ)

54
Q

What conditions would cause the APU to shutdown in flight?

A

FODERS

Fire
Overspeed
DC Power Loss
ECU Failure
RPM Signal Loss
Slow Start
55
Q

What are you looking for after you push the APU PWR/FUEL Switch?

A

DIGS

Door Open
I APU IN BITE
G - RPM and EGT Gauge
S - SOV Open

Part 121 - CRJ 701/900 (25 decks)

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