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United B756 SV Question > Hydraulics (FM: 6.130) > Flashcards

Hydraulics (FM: 6.130) Flashcards

1
Q

757: The power transfer unit (PTU) uses hydraulic pressure from the right hydraulic system to power a hydraulic motor which in turn drives a hydraulic pump in the left hydraulic system. The PTU is activated:
a) Automatically if both engines fail
b) Automatically if the left engine fails or the left engine driven pump pressure is low
c) Automatically if the right engine fails or the right engine driven pump pressure is low
d) Manually activated only when the PTU switch is moved to the ON position

A

B) Automatically if the left engine fails or the left engine driven pump pressure is low

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2
Q

757: The hydraulic motor generator (HMG) is automatically powered by the___________ whenever both main AC busses become unpowered in flight.
a) Left hydraulic system
b) Right hydraulic system
c) Center hydraulic system
d) Center hydraulic system and the PTU

A

A) Left hydraulic system

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3
Q

767: The hydraulic motor generator (HMG) is automatically powered by the ___________ when electrical power is lost from both main AC busses.
a) Center hydraulic system
b) Right hydraulic system
c) Left hydraulic system via the ADP
d) Left hydraulic system and the PTU

A

A) Center hydraulic system

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4
Q

757/767: When deployed, the RAT drives a hydraulic pump that supplies adequate pressure for flight controls down to an airspeed of approximately ______.

a) 80 knots
b) 100 knots
c) 120 knots
d) 130 knots

A

D) 130 knots

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5
Q

757: The center hydraulic system reservoir contains a standpipe to reserve hydraulic fluid for the ________ in the event of a center system hydraulic leak.
a) Power transfer unit (PTU)
b) Reserve brakes
c) Ram air turbine (RAT)
d) Nose wheel steering system

A

C) Ram air turbine (RAT)

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6
Q

757/767: To prevent electrical overload, during normal setup of the hydraulic panel, the _______ pump is inhibited when only one generator (APU or engine) or only external power is available.

a) Center #1
b) Center #2 and left electric
c) Center #2
d) Center #1 and right electric

A

C) Center #2

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7
Q

757/767: According to the graphic, what is the status of the ram air turbine (RAT)?

a) There is an error detected in the RAT system
b) The RAT is unlocked but not yet deployed
c) The RAT is deployed but the output pressure is not sufficient
d) The RAT is deployed and producing hydraulic pressure

A

D) The RAT is deployed and producing hydraulic pressure

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8
Q

757: External power is providing electrical power prior to engine start. According to the graphic, the No.2 electric pump PRESS light is illuminated because:
a) The pump has failed and maintenance must be contacted
b) The pump will only operate in flight
c) The pump is a demand pump and only operates when necessary
d) The pump operation is inhibited to reduce electrical loads

A

D) The pump operation is inhibited to reduce electrical loads

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9
Q

757/767: The hydraulic quantity for each hydraulic system is displayed:

a) On the standby engine indicator
b) On the EICAS control panel
c) On the hydraulic control panel
d) On the EICAS status page

A

D) On the EICAS status page

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10
Q

757: According to the graphic, the RSVR light is illuminated. This indicates that:
a) Reservoir quantity is below 75%, and reservoir air pressure is high
b) Reservoir quantity is below 50%, and reservoir air pressure is high
c) Reservoir quantity is below 75%, or reservoir air pressure is low
d) Reservoir quantity is below 50%, or reservoir air pressure is low

A

D) Reservoir quantity is below 50%, or reservoir air pressure is low

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11
Q

757: According to the graphic, the EICAS POWER XFER UNIT status message is displayed. What is the status of the power transfer unit (PTU)?
a) The PTU switch on the auxiliary panel has been placed to the ON position while airborne
b) The PTU has been activated and is operating properly
c) The PTU has been activated
d) The PTU is not operating properly

A

D) The PTU is not operating properly

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12
Q

757: During normal operations, the trailing edge flaps and leading edge slats are powered by the _______ hydraulic system(s).
a) Right system
b) Left system
c) Center system
d) Left, center and right systems

A

B) Left system

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13
Q

757/767: Yaw control is provided by a single rudder which receives hydraulic pressure from the _________ hydraulic system(s).

a) Right and center only
b) Left, center, and right
c) Left and right only
d) Left only

A

B) Left, center, and right

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14
Q

757: According to the graphic, when the RESERVE BRAKES switch is activated, fluid trapped below a standpipe is made available to the _________.
a) Center #1 pump
b) Right electric pump
c) Left electric pump
d) Center #2 pump

A

B) Right electric pump

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15
Q

757: When activated, the power transfer unit (PTU) supplements the left hydraulic system electric motor-driven pump to operate the following:
a) Flaps and slats, landing gear, nose wheel steering and hydraulic motor generator (HMG) if installed
b) Alternate flaps and slats, alternate landing gear and nose wheel steering
c) Flaps and slats, landing gear, nose wheel steering and reserve brakes
d) Alternate flaps and slats, landing gear, nose wheel steering and HMG if installed

A

A) Flaps and slats, landing gear, nose wheel steering and hydraulic motor generator (HMG) if installed

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16
Q

767: Across the entire aircraft, how many hydraulic reservoir standpipes are there?
a) One
b) Three
c) Two
d) Four

A

A) One

17
Q

757: Across the entire aircraft, how many hydraulic reservoir standpipes are there?
a) Three
b) Two
c) One
d) Four

A

A) Three

18
Q

767: The center system reservoir contains a standpipe to reserve a supply of fluid for the:
a) Reserve brakes and steering system
b) Primary flight controls
c) Ram air turbine (RAT)
d) High demand items

A

A) Reserve brakes and steering system

19
Q

767: To prevent electrical overload, the No. 2 electric primary pump is inhibited when only one generator (APU or engine) or only external power is available and _________ is/are commanded to operate.
a) The left and right electric hydraulic pumps
b) The air demand pump (ADP)
c) Both center electric hydraulic pumps
d) The other three electric hydraulic pumps

A

D) The other three electric hydraulic pumps

20
Q

757/767: The _________ is available to supply hydraulic pressure to the center system flight controls in the event of a dual engine failure in flight.

a) Air demand pump
b) Power transfer unit (PTU)
c) Ram air turbine (RAT)
d) DC powered electric hydraulic pump

A

C) Ram air turbine (RAT)

21
Q

767: When the RESERVE BKS & STRG switch is pressed, the ____________ is turned on regardless of switch position.
a) Center No.1 primary pump
b) Left electric motor-driven demand pump
c) Center No.2 primary pump
d) Right electric motor-driven demand pump

A

A) Center No.1 primary pump

22
Q

757/767: The ram air turbine (RAT) is armed for automatic deployment when:

a) Above 80 knots and airborne
b) Above 100 knots and on the ground or airborne
c) Above 85 knots and on the ground or airborne
d) Above 130 knots and on the ground or airborne

A

A) Above 80 knots and airborne

23
Q

767: The air demand pump (ADP) operates automatically whenever center system pressure drops to a preset value. In addition, the pump operates automatically whenever the landing gear, flaps, slats, or speed brakes/ground spoilers are selected for operation. The ADP will also operate when:
a) Center system hydraulic pressure drops below a preset value
b) The No.2 electric motor-driven primary pump is inoperative
c) The No.1 electric motor-driven primary pump is inoperative
d) The RSVR light is illuminated

A

A) Center system hydraulic pressure drops below a preset value

24
Q

757: When the hydraulic motor generator (HMG) is operating, hydraulic flow to the flaps and slats is _______, resulting in:
a) Reduced, increased operating time for the flaps and slats
b) Reduced, increased operating time for the flaps, but no impact on the slats
c) Kept the same, no impact on the operation of the flaps and slats
d) Reduced, increased operating time for the slats, but no impact on the flaps

A

A) Reduced, increased operating time for the flaps and slats

25
Q

757: Can the hydraulic motor generator (HMG) (if installed) be driven by the PTU?
a) Yes. The HMG may be driven by the PTU
b) Yes. As long as the right electric hydraulic pump is operating
c) No. The HMG cannot be driven by the PTU
d) Yes. As long as the left electric hydraulic pump is operating

A

A) Yes. The HMG may be driven by the PTU

26
Q

767: When the air-driven pump (ADP) is inoperative:
a) There is no impact on landing gear retraction but flap/slat extension/retraction times will increase
b) Landing gear retraction and flap/slat extension/retraction times will increase
c) Landing gear retraction time will increase, but no impact on the flaps/slat system
d) There is no noticeable impact on the landing gear or flap/slat operation

A

B) Landing gear retraction and flap/slat extension/retraction times will increase

United B756 SV Question (19 decks)

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