B727 Questions Hydraulic System
Revised 28-Feb-2001
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  1. Hydraulic power can be supplied by how many hydraulic systems.
  2. Hydraulic pressure is supplied to the main wheel brakes normally by what and what as an alternate source.
  3. What is installed to system "B" to pressurize system "A".
  4. The standby system can be used for backup operation of what items
  5. Hydraulic pumps are installed on engines
  6. A windmilling engine can provide what sort of hydraulic pressure.
  7. What is operated to depressurise "A" system
  8. With a loss of power on the DC 1 bus, the system "A" pumps will revert to what position.
  9. Fluid that enters the pumps for cooling and lubrication leaves the pumps where.
  10. If the system "A" pump switches are continually left in the OFF position. What will happen.
  11. Hydraulic fluid shutoffs are controlled by shutoff switches, where.
  12. The system "A" reservoir is located where.
  13. The reservoir is pressurized by what
  14. The system "A" reservoir will provide hydraulic fluid to the system "B" reservoir until the fluid level in the "A" reservoir reaches what level.
  15. A temperature sensor for the system "A" fluid is located in what line.
  16. The system "B" pumps are operated by
  17. System "B" pressure can be read an the hydraulic pressure gauge, where.
  18. The case drain fluid from the two system "B" pumps is cooled in a heat exchanger where
  19. Temperature sensors for system "B" are located in what lines.
  20.   To properly coal the system "B" fluid how much fuel should be contained in that tank
  21. The ground interconnect will open under what conditions
  22. The standby hydraulic pump operates at  what pressure
  23. Normal pressure in the standby hydraulic system is shown by what.
  24. What will turn on the standby pump
  25. Minimum standby system quantity for dispatch is what.
  26. What indicates when the brake interconnect valve is open.
  27. An accumulator is installed in the brake system for what reason.
  28. With the hydraulic system unpressurized. The brake pressure gauge will read
  29. If a leak occurs at the brake assembly. a complete loss of fluid will be prevented by what.
  30. Either normal or emergency brake pressure is directed to the brake assembly by what component
  31. The red light next to the parking brake handle illuminates to show what.
  32. What operates the emergency brakes system.
  33. Attempting to use both the pneumatic brakes and the brake pedals may do what.
  34. What happens to the landing gear retraction system with the landing gear lever in the OFF position
  35. To facilitate removal of a wheel what on each main landing gear is extendable
  36. What operates the nose gear doors
  37. How can you tell if the tailskid has been compressed sufficiently to crush its cartridge.
  38. The air/ground and ground safety sensors are located where.
  39. During the procedure for loss of hydraulic fluid quantity, what should be turned off before the pumps.
  40. What will happen in flight if the landing gear is extended and you move the steering handle.


  1.   Three independent systems
  2. System "B" and pneumatic source
  3. Ground interconnect
  4. Lower rudder, leading edge devices
  5. 1 and 2
  6. Full system pressure
  7. solenoid, output
  8. ON
  9. Case Drains
  10. Solenoids will overheat, deteriorate, fail
  11. FE's Panel & fire switches
  12. Left hand aft airstair area
  13. Bleed air engines 1 & 2. (Normally)
  14. 2.5 US Gall
  15. Returns, reservoir
  16. Electric Motors
  17. Fe's Panel and don't forget the brake pressure indicator
  18. N01 Fuel tank
  19. Case drains
  20. 1340 lbs
  21. On APU or external power available
  22. 3000 psi
  23. Green light
  24. Alternate flap extension switches, standby rudder switch.
  25. .3 US gall
  26. Green light
  27. Hydraulic system pressure is lost
  28. Accumulator pressure normally between 1000 and 3000 psi. Depending on type
  29. Lockout deboost cylinders
  30. Shuttle valve
  31. Lever linkage is set (might not have any brakes though)
  32. Compressed nitrogen
  33. Prevent braking action
  34. Hydraulic pressure cut off
  35.  Wing door linkage (X check it after a wheel change on your walkround)
  36. Mechanically linked to nose gear
  37. Indicator clip
  38. Left main and nose gear
  39. Spoiler switch
  40. Damage the nose gear due centering mechanism.


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