Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

E175 > Hydraulics > Flashcards

Hydraulics Flashcards

1
Q

What components are included in Hydraulic System 1?

A
  • Rudder (Upper Actuator)
  • Elevator (L Outboard)
  • Multi-Function Spoilers (L & R panels 3 & 4)
  • Outboard Brakes,
  • Ground Spoilers (L & R panel 2)
  • Thrust Reverser (Engine 1)
  • Emergency Parking Brake

NOTE: Outboard Brakes or emergency Parking Brake not shown on picture

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What components are included in Hydraulic System 2?

A

Elevator (L & R Inboard)
Ailerons (L & R Inboard)
Thrust Reverser (Engine 2)
Multi-Function Spoilers (L & R panels 5)
Ground Spoilers (L & R panel 1) Brakes (Inboard)
Landing Gear
Nose Wheel Steering, Emergency Parking Brake

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What components are included in Hydraulic System 3?

A

Elevator (R. Outboard)
Rudder (Lower Actuator) Ailerons (L & R Outboard)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What are the key features of Hydraulic System 1?

A

1 reservoir
1 Engine Driven Pump (EDP)
1 AC Motor Pump (ACMP) as back-up for EDP
2 accumulators

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What distinguishes Hydraulic System 2 from Hydraulic System 1?

A

Identical to Hydraulic System 1 with exceptions: allows for single-engine taxi, activates ACMP 2 for nose wheel steering and inboard brakes if only engine 1 is operating, uses PTU for hydraulic pressure to aid in landing gear operation if engine 2 or EDP 2 fails.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What are the components of Hydraulic System 3?

A

1 reservoir, 2 AC Motor Pumps (ACMP A and B), 1 accumulator

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What is the primary pump in Hydraulic System 3?

A

Pump A is the primary pump.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What are the operational positions of Pump A?

A

The pump is either ON or OFF.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What is the backup pump in Hydraulic System 3?

A

Pump B is the backup pump.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What are the operational positions knobs of Pump B?

A

The pump has three positions: OFF, AUTO, or ON.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

When does Pump B turn on automatically?

A

In AUTO, ACMP B will turn on automatically with a failure of ACMP A.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What does the accumulator in System 3 provide during an electrical emergency?

A

It provides hydraulic power to the associated flight controls

.

From the beginning of RAT deployment until AC ESS BUS powers the ACMP 3A.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What activates the ACMP in flight?

A

System logic activates ACMP in case of EDP failure or flaps selected to any position greater than 0°.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What activates the ACMP on the ground?

A

System logic activates ACMP in case of flaps selected to any position greater than 0° and thrust levers set to takeoff thrust or groundspeed greater than 50 knots.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What is the purpose of the accumulators in Systems 1 and 2?

A

They are used for ‘shock absorption’ in the system and for emergency parking brake use.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What is the purpose of the accumulator in System 3?

A

It is used during an electrical emergency to temporarily provide hydraulics to the flight controls.

17
Q

What happens at 100°C in Hydraulic Systems?

A

HYD # HI TEMP CAUTION EICAS is triggered.

18
Q

What happens at 125°C in Hydraulic Systems?

A

Respective SOV closes automatically

Both AC pumps for SYS 3 turn OFF.

19
Q

What happens at 145°C in Hydraulic Systems?

A

HYD # OVERHEAT WARNING EICAS is triggered.

20
Q

Why is the message for system 3 inhibited during an electrical emergency.

A

To avoid shutting down the only source of hydraulics.

21
Q

How many hydraulic systems are on the airplane?

A

3 Independent systems: HYD 1, HYD 2, and HYD 3

22
Q

What systems use hydraulic power?

A

Flight controls
Spoilers
Landing gear
Nose wheel steering
Wheel brakes
Thrust reversers

23
Q

Can hydraulic fluid be transferred between each system?

A

No

24
Q

How many hydraulic pumps are on the airplane?

A

7 total: 2 EDPs (Engine Driven Pumps), 4 ACMPs (AC Motor Pumps), 1 PTU

25
Q

What are the basic components of the hydraulic systems?

A

Reservoir, Pumps, Accumulator

26
Q

What is the purpose of the accumulator?

A

Helps to maintain constant pressure by covering transient demands and helps to avoid pump cavitation

27
Q

When will ACMP 1 or 2 automatically activate?

A

Ground: Flaps > 0, and TL set to TOGA, OR Groundspeed > 50 kts (Remains on for 60 seconds after TL at TOGA)

Flight: Engine failure or EDP failure, OR Flaps > 0 (Remains on for 60 seconds after landing)

28
Q

What are some important items controlled by the HYD 2 system?

A

Landing gear
Nose wheel steering
Inboard brakes

29
Q

What is the PTU?

A

Power Transfer Unit

Mechanical pump that uses HYD 1 power to provide HYD 2 pressure.

30
Q

What is the primary purpose of the PTU?

A

To allow landing gear retraction and extension in the event of an engine 2 or EDP 2 failure.

31
Q

When will the PTU automatically activate?

A

During takeoff and landing with flaps > 0, if Engine 2 fails, or EDP 2 fails.

Must have above 12% quantity in #2 Hydraulic Reservoir and Airplane is Airborne. Engine #1 EDP must be operational.

32
Q

How is single engine taxi possible if nose wheel steering is on HYD 2?

A

Releasing the parking brake activates ACMP 2.

33
Q

What is the primary purpose of the HYD 3 system?

A

Back-up for the Flight controls.

34
Q

Why does HYD ACMP 3A pump switch have an ON position and HYD ACMP 3B have an AUTO position?

A

HYD ACMP 3A pump is primary and has no automation; HYD ACMP 3B pump is a back-up and automatically activates if ACMP 3A fails with normal AC power.

35
Q

What, if any, HYD ACMP will function if the RAT is the only power source?

A

HYD ACMP 3A only with no backup.

36
Q

In an electrical emergency what provides hydraulic pressure to flight controls until the RAT comes online?

A

HYD 3 accumulator.

After 8 seconds the RAT will power ACMP 3A.

37
Q

In an electrical emergency can HYD 3 system power requirements overload the RAT?

A

No. A flow limiter valve and a pump unloader valve are used to reduce flow and limits pump electrical power draw to prevent a RAT stall.

E175 (8 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions