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25 Cards in this Set
- Front
- Back
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1. Which Hydraulic System is used to retract and extend the landing gear?
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#3
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2. With the aircraft on the ground, what is incorporated within the landing gear control lever to prevent an up selection?
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Weight on wheels detection from PSEU which disables solenoid movement and locks the landing gear control lever's control inputs.
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3. During the Landing Gear retraction sequence, why is hydraulic pressure from the nose landing gear up line routed to activate the brake control valves?
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Brakes cylinders are actuated slightly to slow the tire rotation speed as the gear retracts. This lowers the heat from friction against the landing gear bay friction pads.
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4. The PSEU monitors the position of what?
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All systems which occupy the same physical space at different times, such as gear doors and landing gear
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5. Where is the Landing Gear position and status displayed?
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EICAS primary display
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6. Explain how the pulling of the landing gear manual release handle will permit the landing gear to extend and lock into position:
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Mechanically releases gear-up locks and nose gear door locks
Dump valves route #3 hydraulic pressure to return Gear assisted down by airflow and mechanically from springs #2 system assists to ensure gear is fully deployed |
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7. Where is the Nose Door open Flt/norm switch located?
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External panel near nose (need title of panel)
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8. What hydraulic system supplies pressure to the wheel brakes?
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3 – Inboard brakes
2 – outboard brakes |
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9. In the event of a failure of No. 2 and No. 3 Hydraulic power, what emergency braking is available?
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Accumulators provide reserve pressure for 6 brake applications with anti-skid off
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10. What must be done to check the brake wear indicator pins?
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Parking brake set, system 2 and 3 providing positive hydraulic pressure, (may require gear extended, which will necessitate lifts or midgets willing to crawl in the gear bays and check the brakes in-flight)
***Must be replaced when pins have worn and are flush |
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11. When using the steering tiller, nose wheel steering is available through how many degrees?
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70 (5.8 degrees with rudder pedals)
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12. What do the proximity sensing electronic unit (PSEU) control the sequencing of?
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Up locks, down locks, landing gear, nose doors
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13. What are the shock struts filled with?
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Nitrogen-charged oil
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14. How does the steering tiller work and where is it located?
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Left and right side panels – the black triangular bars with semi-circular handle on front, which rotates while taxiing.
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15. “PSEU”
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Proximity Sensing Electronic Unit – monitors correct positioning of mechanical parts and disables conflicting positions or improper sequencing (like lowering gear before opening gear doors)
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16. What speed are the tires rated to?
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182KTS
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17. What type of tires are on the nosewheel?
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“Chine” type tires, which spin water and debris outward rather than into the fuselage
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18. “BTMS”
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Brake Temperature Monitoring System
0-5: Green 6-12: White 13-20: Red Each number is roughly 35 degrees Celsius No takeoff unless BTMS-05 or less for at least 15 minutes. |
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19. What is a fusible wheel plug?
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At a very hot temperature, a pliable plug melts and allows air to flow rapidly out of the wheel, deflating it rather than detonating it.
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20. “ASCU”
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Anti-Skid Control Unit
Anti-skid disabled unless WOW+5 seconds, 35kts+ wheel spin. Also disabled below 10kts |
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21. Why does the nose area need to be clear before activating #3 hydraulic pump?
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Nose gear may swivel into place and cause personal injury
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22. What is meant by “steer-by-wire”?
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No mechanical units are directly connected between rudder pedals or tiller and the steering mechanisms themselves.
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23. What page is BTMS on? Is it always shown?
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EICAS Status page. Shown until 2 minutes after weight off wheels.
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24. When is the “TOO LOW GEAR” indication active?
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When below 500ft AGL and less than 190kts without gear extension
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25. Is it possible to land with the brakes on?
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No. All braking is disabled until WOW+5sec OR 35kts+ wheel spin
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