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E175 Systems > Hydraulics > Flashcards

Hydraulics Flashcards

0
Q

What pressurizes the hydraulic system 1 reservoir

A

A mechanical piston

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1
Q

What makes up Hydraulic system 1

A

Hydraulic System 1 is comprised of:

  • one reservoir,
  • one Engine-Driven Pump (EDP 1)
  • one electric hydraulic pump
  • one accumulator
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2
Q

What powers ACMP 1

A

AC BUS 2

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3
Q

In flight, with the selector knob set to AUTO position, when will the Hydraulic System logic activate the electric pump

A
  • EDP or engine fail, or

* Flaps selected to any position greater than 0°.

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4
Q

On ground, with the selector knob set to AUTO position, when will the Hydraulic System logic activate the electric pump

A

• Flaps selected to any position greater than 0° and:
– Thrust levers set to takeoff thrust, or
– Ground speed greater than 50 kt.

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5
Q

What makes up Hydraulic System 2

A

Hydraulic System 2 is comprised of

  • one reservoir,
  • one engine-driven pump (EDP 2),
  • one electric hydraulic pump,
  • one accumulator and
  • one PTU.
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6
Q

On ground, with the selector knob set to AUTO position, when will the Hydraulic System logic activate ACMP 2

A

Flaps selected to any position greater than 0° and: – Thrust levers set to takeoff thrust, or
– Ground speed greater than 50 kt.
Also:
– Engine 1 running and parking brake released
– During Engine 1 start (once N2 reaches 40%) if parking brake has been applied within the last 6 min.

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7
Q

What is the Power Transfer Unit

A

a hydraulic pump in Hydraulic System 2 driven by a hydraulic motor installed in Hydraulic System 1

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8
Q

What is the PTU used for

A

The PTU assists the landing gear retraction or extension, should a right engine or right EDP failure occur

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9
Q

When will the PTU be started automatically

A

The PTU will be automatically started when all the following conditions are met:

  • engine 2 fails or EDP2 fails and:

– Flaps not set to zero or Landing Gear not up and locked;

– EDP 1 not fail;

– Hydraulic reservoir 2 quantity above 12%

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10
Q

What happens with the hydraulic system 3 when the temp reaches 100C

A

The HYD 3 HI TEMP caution will display

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11
Q

What happens if the hydraulic system 3 reaches 125C

A

Both electric hydraulic 3A and 3B pumps are automatically turned off

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12
Q

What happens if hydraulic system 3 reaches 145C

A

The HYD 3 OVERHEAT warning is displayed

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13
Q

What powers ACMP 3A

A

AC ESS BUS

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14
Q

What powers ACMP 3B

A

AC BUS 2

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15
Q

What are the 2 dedicated valves called in system 3 and what are they for

A

Pump unloader valve - The pump unloader valve is used to reduce the discharge pressure of ACMP 3A during its start-up

The flow limiter valve is used to reduce the amount of flow provided by the ACMP 3A.

Ultimately, both decrease the electrical load on the RAT

E175 Systems (20 decks)

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