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E-Jet EMB175 > Hydraulics > Flashcards

Flashcards in Hydraulics Deck (14)
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1
Q

System 1 has

A
  • 1 reservoir
  • 1 engine driven pump (EDP)
  • 1 AC motor pump (ACMP) used as a back up for the EDP
  • 2 accumulator
2
Q

System 2 has

A

Same as system 1

  • allows single engine taxi
  • ACMP 2 to provide hydraulic power to nose wheel steering
  • Inboard brakes
  • PTU (power transfer unit) provides pressure to system 2
3
Q

System 3 has

A
  • 1 reservoir
  • 2 AC motor pumps (ACMP A and B)
  • Pump A is primary
    • No AUTO position, pump is either On or OFF
  • Pump B
    • Three positions OFF, AUTO and ON
    • AUTO, ACMP B will turn on AUTOM with Failure of ACMP A
  • 1 Accumulator
  • Electrical failure system 3 accumulator will provide hydraulic power to flight controls
4
Q

In flight

A
  • System logic activates ACMP in case of
  • EDP failure
  • Flaps selected to any position greater than 0
5
Q

On the ground

A
  • System logic activates ACMP in case of
    • Flaps selected to any position greater than 0 degrees
    • Thrust levers set to takeoff thrust or groundspeed greater than 50 Knots
6
Q

Accumulators

A
  • System 1 and 2 Shock absorption
  • Another accumulator for emergency parking brake
  • System 3 has 1 accumulator electrical emergency provides hydraulics to flight controls
7
Q

How many applications for the brakes with the brake accumulator?

A
  • 6 total application
8
Q

What does the PTU (power transfer unit) for?

A
  • The PTU assists landing gear extension and retraction in the event Engine driven hydraulic pump 2 fails, Engine 2 fails.
  • Requires no AC power
9
Q

When would you take ACMP 1 control out of AUTO to ON?

A
  • When taxing with Engine 2 running only.
10
Q

When ACMP 1 is set on AUTO what does it do?

A
  • Turns pumps on automatically for
    • T/O 50 kts ground speed or Thrust levers TOGA
    • Landing (flaps greater than 0)
    • Or EDP (engine driven pump) failure
11
Q

When ACMP 2 is in AUTO what is controlled?

A
  • Turns on automatically when
    • Single engine taxi if engine 1 is running
    • parking break released or set within 6 min
    • T/O 50 kts ground speed or Thrust levers TOGA
    • Landing flaps greater than 0
    • EDP (engine driven pump) Failure
12
Q

When is ACMP 3A on or off?

A
  • Turned ON before engine start and OFF after engine shut down.
13
Q

ACMP 3B in AUTO does what?

A
  • Automatically turns the pump ON if 3A fails inflight. Stays in AUTO
14
Q

Minimum reservoir temp for ENG Start?

A

-18 degrees C