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62 Cards in this Set
- Front
- Back
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What are the names of the four (4) hydraulic systems? |
#1 Main Hydraulic System
#2 Main Hydraulic System #3 Backup System Auxiliary System |
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What can the #1 and #2 Main Hydraulic systems provide power to?
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Elevators
Rudders and Spoilers Landing Gear Nose Wheel Steering Brakes |
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What source provides the pressure for the #1 Main Hydraulic System normally?
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The Left Engine
Engine Driven Hydraulic Pump #1 (EDP1) |
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What source provides the pressure for the #2 Main Hydraulic System normally?
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The Right Engine
Engine Driven Hydraulic Pump (EDP2) |
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What is the normal pressure for the hydraulic systems?
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3,000 PSI
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What "backs up" the #1 Hydraulic System in the event of failure?
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The "Standby Hydraulic Pump".
AC powered motor pump! |
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At what time is the "Standby Hydraulic Pump" normally selected to "ON"?
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For all takeoffs and landings.
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At what times will the "Standby" hydraulic pump automatically activate?
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1. #1 Engine Failure
2. Flaps are out of the 0 degree detent with the "Parking Brake Released". |
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What bus powers the "Standby Hydraulic Pump"?
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Normally the "Right 115 VAC Bus".
If the Right 115 VAC Bus fails then the "Left 115 VAC Bus" will power the Standby Pump as a backup. |
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What provides backup pressure to the #2 Main Hydraulic System?
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Power Transfer Unit (PTU)
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At what time is the Power Transfer Unit (PTU) normally turned "ON"?
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For all takeoffs and landings.
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What powers the Power Transfer Unit (PTU)?
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The #1 Main Hydraulic System.
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What is the purpose of the #3 Backup Hydraulic System?
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It provides backup power to the "inboard" PCUs on each elevator in the event of system #1 or system #2 failure.
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Is it possible to activate the "#3 Backup Hydraulic Pump" manually?
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Yes
By pressing the "HYD #3 ISOL VLV" switchlight on the Hydraulic Control Panel. |
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At what times will the "#3 Backup Hydraulic System" automatically power the inboard PCUs on the elevators?
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1. Failure of "both" engines.
2. Failure of "#1 Main Hydraulic System" or "#2 Main Hydraulic System". |
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What actually powers the #3 Backup Hydraulic System?
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A gas charged "accumulator".
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What keeps the gas charged accumulator pressurized for the #3 Backup Hydraulic System?
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A 28 VDC Motor Pump will turn "ON" and "OFF" to keep the accumulator pressurized between 2,600 PSI and 3,250 PSI.
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What is the purpose of the "Auxiliary Hydraulic System"?
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Provides power for the alternate gear extension system only!
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The #1 Main Hydraulic System supplies power for the operation of what?
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1. Flaps
2. Inboard Roll Spoilers 3. Brakes 4. Anti-Skid 5. Rudder (Lower PCU) 6. Power Transfer Unit (PTU) 7. Elevators (Outer PCU) Remember: "FIBAR PE" |
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The #2 Main Hydraulic System supplies power for the operation of what?
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1. Landing Gear
2. Outboard Roll Spoilers 3. Steering 4. Elevator (Center PCUs) 5. Rudder (Upper PCU) 6. Emergency/Parking Brakes Remember: "LOSER E" |
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Where is hydraulic system pressures and quantites normally displayed?
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On the first officer's MFD display on the bottom.
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If the first officer's MFD display fails, how can hydraulic system pressures and quantities be viewed?
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On the captain's MFD display.
Only shown in digital format. |
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What does the "Park Brake / Emergency Brake" hydraulic pressure indicator actually show?
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The amount of fluid pressure applied to the brakes with the parking brake set.
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Each "tick mark" on the Parking Brake pressure indicator is equivalent to how many pounds pressure?
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1,000 PSI
Scale reads from 0 to 4 (0 to 4,000 PSI) |
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If the Parking Brake pressure indicator parameters are invalid, how is it displayed?
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The indications revert to a "white dashed line".
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What does each "tick mark" represent on the "Standby Hydraulic System" pressure indicator?
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1,000 PSI
Scale reads from 0 to 4 (0 to 4,000 PSI) |
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If the Standby Hydraulic System pressure indicator parameters are invalid, how is it displayed?
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The indications revert to a "white dashed line".
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Will the "#3 Backup Hydraulic System" pressure indicator always show pressure within the system?
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No
It will only indicate pressure within the system when the "HYD ISOL VLV" is "OPEN". The "HYD ISOL VLV" can be either manually or automatically selected to "OPEN". |
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What digital values are indicated on the pressure readout for the #3 Backup Hydraulic System?
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Only 0, 2 and 4!
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The #1, #2 and #3 Hydraulic System "quantity" indications show the fluid quantity that is where?
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Within the respective systems hydraulic reservoir.
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The #1, #2 and #3 hydraulic system "quantity" indicator scale is marked at what intervals?
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Every 25% from 0% to 100%
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Where is the reservoir physically located for the #1 Main Hydraulic System?
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In the Left Engine nacelle.
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Where is the reservoir physically located for the #2 Main Hydraulic System?
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In the Right engine nacelle.
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What is the hydraulic fluid quantities for the following systems:
#1 System? / #2 System? #3 Backup System? / Auxiliary System? |
#1 Main Hydraulic System: 8.9 Quarts
#2 Main Hydraulic System: 12 Quarts #3 Backup Hydraulic System: 2.6 Quarts Auxiliary System: 1.0 Quarts |
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In what two (2) ways can the hydraulic fluid quantities be determined?
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1. By the quantity readout on the first officer's MFD display.
2. By the mechanical fluid quantity gauge located on each hydraulic reservoir. |
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In what "measurement" does the mechanical fluid quantity indicators on the hydraulic reservoirs indicate the quantity?
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#1 and #2 Main Systems: Measured in "Quarts"
#3 Backup System: Measured in "Percent" |
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What is the "minimum dispatch level" for the hydraulic systems?
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For Hydraulic Systems #1, #2 and #3 it's 40% of their capacity.
50% is recommended! |
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What is the purpose of the "STANDBY HYD PRESS" switchlight on the Hydraulic Control Panel?
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When pressed it will activate the Standby Hydraulic Pump if AC power is available.
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At what time will the "Standby Hydraulic Pump" automatically activate without pressing the switchlight?
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#1 Engine Fails
"or" Flaps are set to something other than 0 degrees with the Parking Brake released. Note: AC Power must be available (props out of feather). |
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If the "Standby Hydraulic Pump" automatically activates, will the green "ON" segment of the switchlight illuminate on the Hydraulic Control Panel?
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No
The switchlight will only illuminate if the pump is "manually" activated. |
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What is the purpose of the "PTU CNTRL" switchlight on the Hydraulic Control Panel?
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It will activate the Power Transfer Unit.
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What is required for the PTU to function?
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1. #1 Main Hydraulic System must function "normally".
2. #2 Main Hydraulic System must have normal "fluid quantity". |
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At what time will the PTU "automatically" activate?
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Flaps selected to something other than 0 degrees and the Parking Brake is released.
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Will the green segment of the PTU switchlight illuminate on the Hydraulic Control Panel if the PTU "automatically" activates?
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Yes
The switchlight will illuminate if the PTU is either automatically or manually activated. |
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What is the purpose of the "HYD #3 ISOL VLV" switchlight on the Hydraulic Control Panel?
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When pushed it will "OPEN" the #3 Hydraulic System Isolate Valve and allow #3 pressure to power the "inboard" elevator PCUs.
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If the "HYD #3 ISOL VLV" automatically "OPENS" will the switchlight on the Hydraulic Control Panel illuminate?
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No
The switchlight will only illuminate if it is "manually" pressed. |
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At what times will the "HYD #3 ISOL VLV" automatically open?
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1. Both engines fail
"or" 2. Either #1 Main Hydraulic System or #2 Main Hydraulic Systems fail. |
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What prevents "fluid loss" in the #1 Main and #2 Main Hydraulic Systems?
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An Isolation Valve.
The systems Isolation Valve will automatically close when the hydraulic fluid quantity reaches a pre-determined level. |
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At what time will the "Isolation Valve" close for either the #1 Main Hydraulic System or the #2 Main Hydraulic System?
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When inadequate fluid quantity is detected in the reservoir.
The Isolation Valve will close and illuminate the "#1 / #2 HYD ISO VLV" caution light. |
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If the Isolation Valve "closes" for the #1 Main Hydraulic System, hydraulic power will only remain to what system #1 services?
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1. Rudder
2. Elevators 3. Flaps 4. PTU Remember: Flight Controls + PTU! |
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If the Isolation Valve "closes" for the #2 Main Hydraulic System, hydraulic power will only remain to what system #2 services?
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1. Rudder
2. Elevators Remember: Flight Controls ONLY! |
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What will be indicated if an Engine Driven Hydraulic Pump (EDP) fails?
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The respective "#1/#2 ENG HYD PUMP" caution light will illuminate.
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What will automatically activate if the "#1 engine" fails to provide hydraulic power to System #1?
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The Standby Hydraulic Pump.
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What will automatically activate if the "#2 engine" fails to provide hydraulic power to System #2?
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The Power Transfer Unit (PTU) will "only automatically activate" if the flaps are selected out of 0 degrees.
Otherwise ... it must be manually selected to "ON". |
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How many sensors are there in each hydraulic reservoir to determine fluid temperature?
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Two (2)
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What will occur if the "first" sensor detects a fluid overheat in the hydraulic fluid reservoir?
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1. "#1/#2 HYD FLUID HOT" caution light will illuminate.
2. A Bypass Valve will open and allow the hydraulic fluid through the Fuel/Oil heat exchanger to help cool the fluid. |
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What will occur if the "second" sensor detects a fluid overheat in the hydraulic fluid reservoir?
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It will send a signal to close the "Emergency Firewall Shutoff Valve" which will stop the flow of hydraulic fluid to the EDP.
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What is indicated if the "#1 STBY PUMP HOT" caution light illuminates?
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The electrical windings of the Standby Hydraulic Pump are hot.
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What will occur if the #1 Hydraulic System "pressure" drops due to system demands?
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If the system pressure drops below 2,100 PSI the "Priority Valve" will automatically "CLOSE" and remove pressure to the flaps and PTU.
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If the "Priority Valve" closes due to a drop in the #1 Hydraulic Systems pressure, what systems will pressure be maintained to?
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1. Elevators
2. Rudder 3. Inboard Spoilers 4. Brakes 5. Anti-skid |
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What is indicated if the "#3 STBY HYD PUMP" caution message illuminates?
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1. The accumulator pressure for the #3 system has dropped below 900 PSI.
"or" 2. The DC Motor Pump has been in operation for longer than 60 seconds while trying to maintain pressure in the accumulator between 2,600 and 3,250 PSI. |
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What is indicated if the "ELEVATOR PRESS" caution light illuminates?
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It is an indication that all three (3) hydraulic systems are powering the elevator!
#3 Hydraulic Systems ISOL valve has failed in the "OPEN" position. |
