Hydraulic Systems and Autopilot Controls
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Questions and Answers

Which hydraulic systems typically power the primary flight controls?

  • Hydraulic System B and C
  • Standby Hydraulic System and A
  • Hydraulic System A and C
  • Hydraulic System A and B (correct)

    • If both Hydraulic Systems A and B are lost, how is the elevator controlled?

  • Via the Flight Spoilers
  • Electrically via back up motor
  • Mechanically through cables (correct)
  • Via the Standby Hydraulic System

    • With the loss of Hydraulic System B, how are the Trailing Edge (TE) Flaps operated?

  • Mechanically with levers
  • Manually
  • Electrically (correct)
  • Hydraulically from the Standby System

    • If the aileron system is jammed or restricted, how is roll controlled?

    <p>By applying force to the First Officer's control wheel, via the spoilers</p> Signup and view all the answers

    Aileron trim is prohibited when the autopilot is engaged because:

    <p>It may be overpowered by the Autopilot and result in an out of trim condition</p> Signup and view all the answers

    Approximately how many degrees of control wheel displacement are required to initiate Flight Spoiler deflection?

    <p>10 degrees</p> Signup and view all the answers

    What does an illuminated FEEL DIFF PRESS light indicate?

    <p>Excessive differential pressure in the Elevator Feel Computer</p> Signup and view all the answers

    What is the primary purpose of the Control Column Actuated Stabilizer Trim Cutout switches?

    <p>To add redundancy and cut out automatic stabilizer commands beyond their position</p> Signup and view all the answers

    What is the function of the STAB TRIM switch on the aft electronics panel when positioned to OVRD?

    <p>It allows operation of the main electric stabilizer trim regardless of control column position</p> Signup and view all the answers

    What warning is triggered when attempting takeoff with the stabilizer trim out of the green band?

    <p>An intermittent horn (takeoff warning) and the TAKEOFF CONFIG light</p> Signup and view all the answers

    What two types of stability augmentation does the Speed Trim System (STS) provide?

    <p>Speed and pitch stability</p> Signup and view all the answers

    Under what condition will the Speed Trim System (STS) not operate?

    <p>When the autopilot is engaged</p> Signup and view all the answers

    What is the main function of the Speed Trim function?

    <p>To return the airplane to a trimmed speed by adjusting the stabilizer</p> Signup and view all the answers

    What is one condition required for the Speed Trim function to operate?

    <p>Within 5 seconds after releasing the Main Electric Stabilizer Trim switches</p> Signup and view all the answers

    How does the Speed Trim function control the stabilizer trim motor with flaps extended?

    <p>At a high rate</p> Signup and view all the answers

    What is the primary function of the Maneuvering Characteristics Augmentation System (MCAS)?

    <p>To increase pitch control column forces by commanding the stabilizer in the nose down direction at elevated AOAs</p> Signup and view all the answers

    What causes the speedbrake warning light to illuminate during flight?

    <p>Speedbrakes are extended and the thrust levers are greater than idle for 15 seconds</p> Signup and view all the answers

    Which condition would NOT cause the LE FLAPS TRANSIT light to illuminate?

    <p>All LE devices in their programmed positions</p> Signup and view all the answers

    What is the primary function of the Flight Control Computers (FCCs) regarding stabilizer trim?

    <p>To protect against runaway stabilizer conditions caused by erroneous FCC trim commands.</p> Signup and view all the answers

    What is the purpose of the Autopilot Elevator Monitor?

    <p>To protect against erroneous elevator commands resulting in incorrect autopilot stabilizer trim commands.</p> Signup and view all the answers

    What is the function of the Flap Load Relief feature?

    <p>Prevents excessive air loads on Trailing Edge Flaps</p> Signup and view all the answers

    What does the Stabilizer Cross-FCC Trim Monitor primarily safeguard against?

    <p>Erroneous stabilizer trim commands.</p> Signup and view all the answers

    How far do the flaps move during the load relief function?

    <p>One flap setting lower than the selected flap position</p> Signup and view all the answers

    What occurs when the ALTERNATE FLAPS master switch is placed to ARM?

    <p>It allows for manual operation of the flaps using alternate methods</p> Signup and view all the answers

    When would a STAB OUT OF TRIM light illuminate inflight?

    <p>When the autopilot is not trimming the stabilizer correctly or a partial FCC failure has occurred while the autopilot is engaged.</p> Signup and view all the answers

    What does the illumination of a FLT CONTROL LOW PRESSURE light signify?

    <p>Low hydraulic system pressure to ailerons, rudder, and elevator.</p> Signup and view all the answers

    What could cause the standby rudder system to pressurize automatically?

    <p>During takeoff or landing or by the Force Fight Monitor.</p> Signup and view all the answers

    What does the STBY RUD ON light indicate when illuminated?

    <p>The standby rudder system is commanded on.</p> Signup and view all the answers

    What is the purpose of the Force Fight Monitor (FFM) on the Main Rudder PCU?

    <p>To detect opposing pressure (force fight) between the A and B actuators.</p> Signup and view all the answers

    What is the primary function of the Standby Rudder system, when activated?

    <p>To turn on the Standby Hydraulic pump and pressurize the standby rudder PCU.</p> Signup and view all the answers

    What would indicate that the Force Fight Monitor (FFM) has sensed a jammed rudder?

    <p>There is no light indication for the FFM sensing a jammed rudder in the text provided.</p> Signup and view all the answers

    What does the Rudder Trim control switch primarily adjust?

    <p>The Rudder Feel and Centering Unit and displaces the Rudder pedals.</p> Signup and view all the answers

    If an FCC detects an erroneous stabilizer trim command, what will it cause to happen?

    <p>Stabilizer trim commands will be stopped and inhibited for the remainder of the flight for that FCC.</p> Signup and view all the answers

    Does the rudder trim operate when the autopilot is engaged?

    <p>Yes, the rudder trim operates with the autopilot engaged.</p> Signup and view all the answers

    How many yaw dampers are incorporated in the yaw damper system?

    <p>Two yaw dampers, one main and one standby.</p> Signup and view all the answers

    Which of the following is NOT a protection provided by the yaw damper system?

    <p>Over bank protection.</p> Signup and view all the answers

    Under which condition will the Yaw Damper switch automatically move to the OFF position?

    <p>If SMYD senses a yaw damper system fault or the yaw damper does not respond to a command or B FLT CONTROL switch is set to OFF or STBY RUD</p> Signup and view all the answers

    When is the Standby Yaw Damper operational?

    <p>During manual reversion with both FLT CONTROL switches set to STBY RUD and YAW DAMPER reset to ON.</p> Signup and view all the answers

    What is the effect on spoilers after a loss of Hydraulic Systems A and B?

    <p>All spoiler panels (flight and ground spoilers) will become inoperative.</p> Signup and view all the answers

    What will occur with all spoilers if electrical power is lost to the Spoilers Control Electronics (SCE) Unit?

    <p>They will retract if extended.</p> Signup and view all the answers

    Which flight control switch(es) are designated for maintenance purposes only?

    <p>The SPOILER A and B switches.</p> Signup and view all the answers

    Study Notes

    Hydraulic Systems

    • Hydraulic systems A and B power primary flight controls
    • Manual reversion for primary flight controls if both hydraulic systems fail
    • Leading Edge (LE) flaps and slats use standby hydraulic system, Trailing Edge (TE) flaps use electrical system
    • If aileron system jammed, roll controlled by force applied to first officer's control wheel; spoilers provide roll control
    • If spoiler jammed, roll controlled by force applied to captain's control wheel; ailerons provide control

    Autopilot

    • Aileron trim prohibited when autopilot engaged, as autopilot controls override trim
    • Autopilot engagement can cause the control wheel to be out of trim if aileron trim is applied
    • More than 10 degrees of control wheel displacement initiates flight spoiler deflection

    Elevator Jam

    • Use elevator jam landing assist system if aft elevator control mechanism jammed
    • System assists landing by using flight spoilers to adjust descent rate (pushing the column increases the descent rate, pulling decreases)
    • Elevator jam landing assist activates when the elevator jam landing switch is ON, the flap position is 1 or more, and autopilot is disengaged

    Instrument warnings

    • Illuminated FEEL DIFF PRESS light indicates excessive differential pressure in the elevator feel computer, potentially due to loss of either hydraulic system or elevator feel pitot system failure

    Control Column Jammed

    • If either control column jammed, apply force to break it free; the column that moves freely can provide control.

    Stabilizer Trim

    • Autopilot engaged - stabilizer trim accomplished through autopilot stabilizer trim circuit
    • Manual stabilizer control by rotating stabilizer trim wheels, through cables
    • High speed mode: flaps extended; low speed mode: flaps retracted
    • Cutout switches (PRI and B/U) disconnect trim inputs from motor (autopilot trim, main electric stabilizer trim, and speed trim system)
    • Stabilization accomplished manually through trim wheel

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    Description

    This quiz covers the essential functions and fail-safes of hydraulic systems A and B, specifically in relation to primary flight controls. It also addresses the challenges that arise with autopilot engagement and elevator jams. Test your knowledge of these crucial aviation systems and their operational protocols.

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