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BE02 Knowledge > Technical knowledge > Flashcards

Technical knowledge Flashcards

1
Q

For how many amps are generators rated?

Continuous + Engine start

A

300 amps > continuous
400 amps > Engine start

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2
Q

What voltage does the GCU (Generator Control Unit) maintains on the DC bus?

Voltage & Tolerance

A

28.25 +/- 0.25 VDC

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3
Q

Volt & amp-hr ratings on aircraft battery?

A

24 VDC
34 amps-hr

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4
Q

What is an H.E.D.?

What makes it surge & where

A

Hall-Effect Device, bidirectional current-sensing device controlling its associated bus tie
(2x) 325 Amps on either GEN ties
(1x) 275 Amps on BATT tie

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5
Q

Can you reset a popped circuit breaker?

which conditions (2)

A

Yes, only if it’s essential & after letting it cool for 3 minutes.

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6
Q

Specifications for using external power?

Volts & Amps

A
  • 28.0 to 28.4 VDC
  • 300 amps (continu)
  • 1000 amps (intermittent)
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7
Q

What is a jet pump?

A
  • Solid-state venturi
  • Assists gravity feed fuel to flow :
    (2x) Transfer JP : main > collector
    (1x) Main tank JP : collector > engine
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8
Q

How many fuel drains under each wing?

A

5

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9
Q

XFR VALVE FAIL (amber)
+ FUEL TRANSFER (white)

In which position is the fuel cross-transfer valve ?

A

Fully OPEN

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10
Q

What is the ACM?

A

Air-cycle-machine
Bleed air driving a compressor, using thermodynamics (pressure<>temperature) to heat, cool & pressurize cabin

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11
Q

What is the VCM?

A

Vapor-cycle-machine
Augments ACM output when more cooling is required, using a closed Freon loop to cool down cabin

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12
Q

Approx. nmbr of strokes to manually lower landing gear?

A

80-90 strokes

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13
Q

After how many seconds does the timer turn off the gear pump?

Whats the use & Amps of the only gear CB?

A

16 +/- 0.5 sec
Gear control handle : 2 Amps

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14
Q

How to confirm green gear lights aren’t burnt out

A

Annunciator test button

(HYD LT TEST = Handle lights only)

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15
Q

What disables power to the flap motor

System & condition

A

Flap safety switch, adjacent to each set of wing flap pairs

When either flap in that pair is more than 3° to 6° out of phase with the adjacent flap.

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16
Q

How long to wait between gear cycles?

A

2 minutes between the first 3 cycles, then 5 minutes between each cycles

17
Q

What holds gear extended?

A

Mechanical downlocks

18
Q

What holds gear retracted?

A

Hydraulic pressure

19
Q

When should you use beta range?

A

Taxi

20
Q

When can you lift a power in flight?

A

Never

21
Q

How can you tell you are operating on the overspeed governor?

A

RPM stabilizes at 1802, with props full forward

22
Q

If CTR bus fails, which important system fails?

A

Landing gear

23
Q

How are false fire alarm prevented?

A

Outside air temperature is monitored & there is a slight time delay factored in.

24
Q

When to turn on auto-ignition (2)

A
  • Rain
  • Turbulence
25
Q

Min. recommended engine oil temp. before T/O & for which reason?

A

55°
Ensures operation of oil-to-fuel heat exchanger

26
Q

What triggers the gear warning horn? (2)

& Which one cannot be silenced?

A

Gear UP (or unsecure), along with :

A) FLAPS > 17, regardless of power
(cannot silence)

B) FLAPS 0-17, with power < 84-86% N1 (descent)

27
Q

BUS SENSE switch : TEST

What it does & what it causes

A
  • Sends ‘‘test currect’’ from the buses to all 3 HED
  • Causes GEN TIE OPEN + BATT TIE OPEN = Isolates CTR bus (0V)
28
Q

BUS SENSE switch : RESET

What it does & what it causes

A
  • Deenergizes the control relays
  • Closes the BATT & GEN ties, extinguishing the annunciators = Reconnects wt CTR bus (28V)
29
Q

GEN TIES switch

Function

A

Manually controls the generators bus tie relay (between GEN buses & CTR bus)

30
Q

GEN TIE switch : MAN CLOSE

A
  • Closes both gen bus ties, allowing current to flow from the CTR to the GEN buses (24V)
  • Illuminates MAN TIES CLOSE annunc. (green)
31
Q

GEN TIES swtich : OPEN

A
  • Removes power from both gen bus ties = L&R GEN TIE OPEN (amber) illum.
  • Generators feed 28V to GEN buses & TPL bus only, disconnected from CTR (24V)
32
Q

L/R GEN TIE OPEN annunc. (amber)

Can you reset (or) close manually ?

A

GEN TIES switch : Cannot manually CLOSE when either gen tie opens due to a ground fault

BUS SENSE switch : RESET may be attempted

33
Q

What results in a TPL bus isolation?

A

3 bidirectionnal 60 Amps current limiters have open (gen1/gen2/battery)

34
Q

Load shedding

If both GEN fail, which buses will the battery feed?

A
  • GEN TIES will automatically OPEN
  • Battery feeds : TPL + CTR + HOT BATT

BE02 Knowledge (7 decks)

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