756 Systems Hydraulics
757/767 Hydraulic Systems Quiz
Test your knowledge of the hydraulic systems in the Boeing 757 and 767 aircraft with our comprehensive quiz. This quiz covers various aspects of hydraulic operation, power transfer, and system redundancy.
Key Features:
- Multiple choice questions
- Covers both 757 and 767 models
- Detailed focus on hydraulic systems and components
1) 757: The power transfer unit (PTU) is automatically activated:
A) If the right engine fails or the right engine-driven pump pressure is low
B) If the left engine fails or the left engine-driven pump pressure is low
C) If the associated hydraulic system pressure drops below a preset value
D) When a dual engine failure occurs in flight
2) 757: The hydraulic motor generator (HMG) is automatically powered by the ___________ whenever both main AC busses become unpowered in flight.
A) The left engine hydraulic pump or the PTU, if operating
B) The right engine hydraulic pump or the PTU, if operating
C) The center engine hydraulic pump or the PTU, if operating
D) The center engine hydraulic pump or the ADP, if operating
3) 767: The hydraulic motor generator (HMG) is automatically powered by the ___________ when electrical power is lost from both main AC busses.
A) The center hydraulic system
B) The right hydraulic system
C) The left engine hydraulic pump or the PTU, if operating
D) The left hydraulic system
4) 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
5) 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) Reserve brakes
B) Power transfer unit (PTU)
C) Ram air turbine (RAT)
D) Reserve brakes and steering system
6) 757: To prevent electrical overloads, the No. 2 electric pump is inhibited when only one generator (APU or engine) or only external power is available and:
A) Left and right electric pump switches are on
B) Both engine-driven pump switches are on
C) Both center hydraulic electric pump switches are on
D) The right electric pump switch is on
7) 757/767: According to the graphic, what is the status of the ram air turbine (RAT)?
A) The RAT is not stowed and locked, and is not producing adequate hydraulic pressure
B) The RAT is not stowed and locked, and is using standpipe fluid
C) The RAT is armed
D) The RAT is not stowed and locked, and is producing hydraulic pressure
8) 757: External power is the sole source of electrical power. The center No. 2 electric hydraulic primary pump PRESS light is illuminated because:
A) The pump is inhibited when the associated N3 is below 50%
B) The pump only operates when associated system pressure is low
C) The pump has failed
D) In order to prevent electrical overloads, the pump is inhibited
9) 757/767: The hydraulic quantity for each hydraulic system is displayed:
A) On the EICAS control panel
B) On the hydraulic control panel
C) On the standby engine indicator (SEI)
D) On the EICAS status display
10) 757: According to the graphic, the RSVR light is illuminated. This indicates that:
A) Reservoir quantity is low (below 50%) or reservoir air pressure is high
B) Reservoir quantity is low (below 75%) or reservoir air pressure is high
C) Reservoir quantity is low (below 75%) or reservoir air pressure is low
D) Reservoir quantity is low (below 50%) or reservoir air pressure is low
11) 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 has been activated and is operating properly
B) The PTU has been activated
C) The PTU switch on the auxiliary panel has been placed to the ON position while airborne
D) The PTU is not operating properly
12) 757: Trailing edge flaps and leading edge slats are hydraulically operated by drive units normally powered by the _____ hydraulic system(s).
A) Right
B) Left
C) Center
D) Left, center and right
13) 757/767: Yaw control is provided by a single rudder which receives hydraulic power from the _________ hydraulic system(s).
A) Right and center only
B) Left, center, and right
C) Left and right only
D) Left only
14) 757: According to the graphic, when the RESERVE BRAKES switch is activated, fluid trapped below a standpipe is made available to the _________ system electric hydraulic pump.
A) Left
B) Right
C) Center No. 1
D) Center No. 2
15) 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, HMG
B) Flaps and slats, landing gear, nose wheel steering
C) Flaps and slats, landing gear, nose wheel steering, reserve brakes
D) Landing gear, nose wheel steering, HMG
16) 767: Across the entire aircraft, how many hydraulic reservoir standpipes are there?
A) One
B) Three
C) Two
D) Four
17) 757: Across the entire aircraft, how many hydraulic reservoir standpipes are there?
A) Three
B) Two
C) One
D) Four
18) 767: The center system reservoir contains a standpipe to reserve a supply of fluid for the:
A) Reserve brakes and steering system
B) Reserve brakes system
C) Ram air turbine (RAT)
D) Power transfer unit (PTU)
19) 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 driven pump (ADP)
C) Both center electric hydraulic pumps
D) The other three electric hydraulic pumps
20) 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 driven pump
B) Power transfer unit (PTU)
C) Ram air turbine (RAT)
D) DC powered electric hydraulic pump
21) 767: When the RESERVE BKS & STRG switch is pressed, the ____________ is turned on regardless of switch position.
A) Center system No. 1 electric primary pump
B) Right system electric primary pump
C) Left system electric primary pump
D) Center system No. 2 electric primary pump
22) 757/767: The ram air turbine (RAT) is armed:
A) On the ground above 80 knots
B) On the ground above 85 knots
C) On the ground above 75 knots
D) Above 130 knots on the ground or airborne
23) 767: In the AUTO position, the air-driven demand pump (ADP) 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 to a preset value
B) The center No. 2 electric primary pump is inoperative
C) The center No. 1 electric primary pump is inoperative
D) Left system hydraulic pressure drops to a preset value
24) 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 these items
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
25) 757: Can the hydraulic motor generator (HMG) be driven by the power transfer unit (PTU)?
A) Yes, the HMG may be driven by the PTU, if operating
B) Yes, as long as the right electric hydraulic pump is operating
C) No, the HMG may not be driven by the PTU
D) Yes, as long as the left electric hydraulic pump is operating
26) 767: When the air-driven pump (ADP) is inoperative:
A) Landing gear retraction/extension and flap extension/retraction times increase
B) Landing gear retraction and flap extension/retraction times increase
C) Flap extension/retraction times increase
D) There is no noticeable impact on landing gear retraction and flap extension/retraction times
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