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Dash 8 Q400 2 > Hydraulics > Flashcards

Hydraulics Flashcards

1
Q

Hydraulic System Description

  • number of systems
  • names
  • minimum dispatch quantity for systems 1, 2, and 3
A

• (4) hydraulic systems:
o #1 and #2 Main systems
o #3 Backup system
o Auxiliary system

NOTE: The minimum dispatch quantity for the #1, 2, and 3 systems is 40% of their normal volume

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2
Q

1 Hydraulic System

  • number of reservoirs and quarts
  • number of pumps
  • when will the AC standby pump activate
  • describe the PTU and when it activates
  • min parking brake pressure prior to starting the left engne
A
  • 1 reservoir (8 quarts)
  • 1 Engine Driven Pump (EDP)
  • 1 AC Standby Motor Pump (ACMP) used as a back-up for the EDP
  • AC Standby pump will automatically activate when the No. 1 engine fails, or whenever the flaps are selected to any position greater than 0° (the parking brake must be released)
  • PTU (Power Transfer Unit) uses hydraulic POWER from system 1 to provide hydraulic PRESSURE to system 2
  • PTU will automatically turn ON when the #2 engine fails or whenever the flaps selected to any position greater than 0° (the parking brake released)

NOTE: Minimum indicated parking brake pressure prior to starting the LEFT Engine first is 1000 psi

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3
Q

1 Hydraulic Abnormal Operation

  • A “Hydraulic System Isolation Valve” remains open for all normal operations
  • If inadequate fluid quantity or loss is detected in the system, #1 Hydraulic system HYD ISO valve CLOSES, hydraulic power is only AVAILABLE to the following #1 services: (4)
A
  • PTU
  • Rudder (lower pcu)
  • Elevators (outboard pcu)
  • Flaps
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4
Q 
#1 Hydraulic Abnormal Operation
- "priority valve" remains open for normal ops: at what pressure will it close and shuts of power to what (2)
A
  • A “Priority Valve” remains open for all normal operations
  • If the hydraulic pressure in #1 system decreases below 2100 psi, the “Priority Valve” automatically closes
  • Closing of the “Priority Valve” shuts off hydraulic power to the Flaps and PTU
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5
Q

1 Hydraulic Abnormal Operation

  • when must the standby hydraulic pump be manually activated
  • when will the standby hydraulic pump automatically be activated
A
  • Standby hydraulic pump must be manually activated in the event of a #1 EDP failure to maintain pressure to the system
  • Standby hydraulic pump will automatically activate in response to a #1 engine failure
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6
Q

1 Hydraulic Abnormal Operation

  • If the #1 and/or #2 Main hydraulic systems fail, #3 hydraulic system will automatically activate to supply pressure to the
  • If automatic activation does not take place, #3 system can be activated manually by pressing the
A
  • If the #1 and/or #2 Main hydraulic systems fail, #3 hydraulic system will automatically activate to supply pressure to the left and right elevator (inboard PCUs) to maintain pitch control
  • If automatic activation does not take place, #3 system can be activated manually by pressing the “HYD #3 ISOL VLV” switchlight on the HYDRAULIC CONTROL panel
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7
Q

2 Main Hydraulic System

  • number of reservoirs and quantity
  • number of pumps
  • what valves does it/does not have
  • min parking brake pressure prior to starting the right engine
A
  • 1 Reservoir (12 quarts)
  • 1 Engine Driven Pump (EDP)
  • Has no PTU
  • A “Hydraulic System Isolation Valve” remains open for all normal operations
  • “Priority Valve” does not exist on the #2 Hydraulic System because it is assisted from the #1 Hydraulic System PTU

NOTE: Minimum indicated parking brake pressure prior to starting the RIGHT engine first is 500 psi

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8
Q

2 Hydraulic Abnormal Operation

  • A “Hydraulic System Isolation Valve” remains open for all normal operations
  • If inadequate fluid quantity or loss is detected in the system, #2 Hydraulic system HYD ISO valve CLOSES, hydraulic power is only AVAILABLE to the following #2 services:
A
  • Rudder (upper pcu)

- Elevators (center pcu)

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9
Q

2 Hydraulic Abnormal Operation

  • when must the PTU be manually activate
  • when will the PTU automatically activate
A
  • PTU must be manually activated in the event of a #2 EDP failure to maintain pressure to the system
  • PTU will automatically activate in response to a #2 engine failure
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10
Q

2 Hydraulic Abnormal Operation

  • If the #1 and/or #2 Main hydraulic systems fail, #3 hydraulic system will automatically activate to supply pressure to the
  • If automatic activation does not take place, #3 system can be activated manually by pressing the
A
  • If the #1 and/or #2 Main hydraulic systems fail, #3 hydraulic system will automatically activate to supply pressure to the left and right elevator (inboard PCUs) to maintain pitch control
    • If automatic activation does not take place, #3 system can be activated manually by pressing the “HYD #3 ISOL VLV” switchlight on the HYDRAULIC CONTROL panel
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11
Q

3 Backup Hydraulic System

  • number of reservoirs and quarts
  • powered by
  • accumulator pressure maintained by and kept between what psi
  • If Both EDPs, Standby Hydraulic Pump, and the PTU FAIL, the DCMP in the #3 hydraulic system will provide hydraulic power to the
A
  • 1 Reservoir (2.6 quarts)
  • Powered by a gas charged accumulator
  • Accumulator pressure is maintained by a DC Motor-Driven-Pump (DCMP)
  • DCMP operation is to maintain the accumulator pressure within 2600 to 3250 psi
  • If Both EDPs, Standby Hydraulic Pump, and the PTU FAIL, the DCMP in the #3 hydraulic system will provide hydraulic power to the left and right elevator for pitch control
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12
Q 
#3 Hydraulic Abnormal Operations
- If the #3 Hydraulic system accumulator pressure falls to \_\_ psi, or if the DCMP has been running for longer than \_\_ seconds while on the ground, it results in the illumination of the #3 \_\_ caution light
A
  • 900, 60, STBY HYD PUMP
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13
Q 
#3 Hydraulic Abnormal Operations
- If the #3 Hydraulic system isolation valve fails OPEN during normal operations, it results in
A
  • all three hydraulic systems supplying pressure to the elevator actuators and the illumination of a “ELEVATOR PRESS” caution light
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14
Q

4 Auxiliary Hydraulic System

  • reservoir and quantity
  • quantity indication
  • purpose of the system
A
  • 1 reservoir (1.2 quarts) located in the right forward lower compartment, aft of the crew O2 bottle
  • There is NO quantity indication in the cockpit
  • Manually operated system and serves as an alternate means of extending the main landing gear
  • This manual system is used to ensure the main landing gear is completely extended
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Dash 8 Q400 2 (16 decks)

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