Q400 > APU > Flashcards

APU Flashcards

(56 cards)

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1
Q

APU model and type of engine?

A

Gas turbine engine
APS 1000

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2
Q

Purposes of APU?

A

On ground for DC power and bleed air

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3
Q

What controls the APU and monitors it?

A

FADEC
Full authority digital control

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4
Q

APU gets power to start from?

A

R main DC bus

Main battery, Aux battery or DC external power

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5
Q

Is the APU fire detection and protection system automatic or manual?

A

Auto

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6
Q

How does the APU receive fuel?

A

Gravity fed fuel pump maintains positive fuel pressure

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7
Q

How much fuel does the APU burn per hour?

A

100kg per hour

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8
Q

APU fuel valve closes when?

A
  1. POWER SWITCH LIGHT PRESSED OFF
  2. FIRE TEST BUTTON PRESSED ON
  3. FADE DETECTS APU
    AUTOMATICALLY SHUT DOWN DUE TO A FAULT
  4. FIRE IS DETECTED IN THE TAILCONE
  5. AIRCRAFT BECOMES AIRBORNE
  6. ILLUMINATION OF GENERATOR
    OVERHEAT LIGHT
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9
Q

Where is the APU compressor air inlet?

A

Top right side of the tailcone

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10
Q

Two APU air inlets used for and located?

A

Compartment ventilation and starter generator cooling.
Located at the bottom forward edge of the tailcone

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11
Q

APU starter/ generator electrical output?

A

28V DC and 400 ampere

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12
Q

How is the APU Gen cooled?

A

Air cooled

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13
Q

How long will the ‘starter’ button stay illuminated when starting the APU?

A

Until reaching 50% speed

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14
Q

When does the RUN light illuminate?

A

> 95% speed

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15
Q

When does the WARN light illuminate?

A

When the generator does not supply power with the APU operating

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16
Q

With the green GEN light ON what is happening?

A

The APU DC generator is supplying power to the DC buses

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17
Q

APU loads can be seen?

A

On the electrical page on the MFD

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18
Q

The Main DC bus loads show what with the APU running?

A

The APU starter generator output

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19
Q

APU GEN load on the MFD shows?

A

The load as a percentage.
1.00 = 100%
.50 = 50 % load

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20
Q

If the APU is on and DC external power is applied, which one powers the buses?

A

The DC external power

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21
Q

Starter generator fault detected what will you see?

A

Green ON light extinguishes
Amber WARN light illuminates
APU caution light illuminates

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22
Q

Starter generator overheat what indications will you see?

A

GEN OHT illuminates
WARN illuminates
APU caution light
APU shuts down automatically

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23
Q

How long after APU start (green run light illuminated) can you press bleed air?

24
Q

What do check valves do?

Study These Flashcards
A

Prevent engine air from flowing into the APU
And prevent bleed air from flowing into either engine

25
#1 or 2 BLEED HOT caution light
Air duct hot or duct leak
26
When APU fire is detected what will you see?
- A red FIRE advisory light on the APU FPP. - The red Master Warning light and the amber Master Caution light flashes on the glareshield. - The CHECK FIRE DET warning flashes red. - The amber BTL ARM advisory light illuminates on the FPP. - The white APU FUEL CLOSED light illuminates on the FPP, and the green APU FUEL OPEN advisory light extinguishes. - The white APU EXTG switchlight illuminates on the Fpp - the amber APU caution light illuminates on the CAUTION/WARNING panel
27
When to manually discharge during APU fire?
When BTL ARM and APU fire advisory light remain illuminated for 7 seconds
28
APU fire bottle type?
Halon 1301
29
Will the BTL LOW amber light on APU fire protection panel cause the master wanting light?
Yes mater warning CHECK FIRE DET
30
Will the APU automatically shut down if there is a fire?
Yes
31
What will you see if the FADEC shuts down the APU?
Amber FAIL light APU FUEL VALVE closed FUEL VALVE open green light is off APU caution light
32
APU temp limits?
Not below -35 Not above the lower of 50 degrees or ISA +35
33
APU starter limits?
60 seconds start attempt Wait 5 mins If APU doesn’t start on second attempt maintenance is required 30 mins from last attempt after maintenance
34
Illumination of the WARN segment of the GEN switchlight can indicate ?
(All of the above) Gen not selected on APU shutdown automatically GCU detects GEN fault
35
On the APU fire protection panel the amber FAULT annunciator indicates there is a fault with ?
The fire detection loop
36
Indications of an APU bleed duct leak are ?
The #1 and #2 BLEED HOT caution lights illuminating
37
Indications that the APU starter is engaged include ?
The STARTER segment of the START switchlight illuminating
38
The APU generates rated power above what operating speed?
95%
39
An APU GEN LOAD of [.49] on the ELECTRICAL system page indicates a load of approximately ?
196 amperes
40
The APU generator supplies power directly to ?
The right MAIN DC bus
41
The APU is mounted ?
In the tailcone
42
When pushing the PWR switchlight on the APU control panel, each switchlight segment illuminating indicates ?
A self test is in progress
43
APU fuel shut-off valve position can be verified ?
On the Fire Protection Panel
44
The fire detection system for the APU utilises ?
A sensor tube filled with an inert gas
45
The APU starter remains engaged until the APU has reached what speed?
50%
46
If an APU fire test is performed while the APU is running ?
The APU will shut down
47
Vhen APU exhaust gas temperature is approaching the limit, to reduce load ?
The generator has priority - bleed air flow is automatically modulated to stay within EGT limits
48
Which of the following will not result in an APU auto shutdown?
Low oil temperature
49
When a fire is detected in the APU compartment an automatic shutdown occurs followed by ?
The extinguishing agent discharging after 7 seconds
50
Per QantasLink policy the APU must not be operated ?
Unless a pilot or engineer is in attendance
51
During gravity refuelling operations the APU ?
Must not be operated
52
The lower and upper temperature limitations for APU operation are ?
-35 and +50 degrees C or ISA +35 degrees C, whichever is lower
53
APU fire detection and protection is available ?
Whenever the DC essential bus is powered
54
The extinguishing agent for an APU fire is supplied from ?
A dedicated bottle in the aft equipment bay
55
In addition to supplying bleed air to the Environmental Control System (ECS), the APU bleed also supplies air to ?
The aft safety valve to hold it open
56
The purpose of the APU check valve is to ?
Prevent engine bleed air from flowing in to the APU
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