Aerodynamics 23 p1-31: Fixed-Wing Aircraft Flight Controls QA pages 1 - 31

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Questions and Answers

What is the purpose of moving the control wheel to the right or left?

To control the ailerons, which bank the aircraft.

What are the purposes of the floor-mounted pedals in front of the pilot?

To control the rudder for yaw and to control the brakes.

What is the purpose of pushing the control column forward?

To lower the elevator, which pitches the nose of the aircraft down.

What is a common use for Non-flexible 1X7 or 1X19 control cables?

<p>For straight runs where flexibility is not required, such as in push-pull systems.</p> Signup and view all the answers

What is a common use for 1/8" diameter extra-flexible 7X19 control cables?

<p>Used in primary control systems where pulleys and fairleads require high flexibility.</p> Signup and view all the answers

What is the main purpose of rubbing a rag along a cable run during an annual inspection?

<p>To check for broken strands or corrosion by feeling for snags or rough spots.</p> Signup and view all the answers

When swaging a terminal end on a cable, once completed, how do you ensure a properly installed swaged-type terminal end?

<p>By measuring the swaged dimension and performing a pull test to verify it meets specifications.</p> Signup and view all the answers

When installing a Nicopress cable sleeve on a 1/8th inch diameter cable, how many compressions are on the sleeve?

<p>Typically, two compressions are required, but consult the manufacturer's instructions for specific guidance.</p> Signup and view all the answers

In accordance with AC 43:13-1B, when is there enough wear on a cable to require replacement of the cable assembly?

<p>When there are any broken wires, excessive corrosion, or fraying that exceeds the limits specified in the advisory circular.</p> Signup and view all the answers

Which method of securing a turnbuckle prevents any rotation or twisting of the barrel once installed?

<p>Lock wiring is the most common method.</p> Signup and view all the answers

What is the maximum number of exposed threads on the cable end allowed outside of the turnbuckle end when tensioning a cable system?

<p>Typically, no more than three threads are allowed to be exposed.</p> Signup and view all the answers

When using the single wrap 0.040 lock-wire method for safetying a turnbuckle assembly, what is the minimum number of wraps at each end?

<p>A minimum of four wraps.</p> Signup and view all the answers

What is the purpose of the Pulley Guard?

<p>To prevent the cable from slipping off the pulley and to protect the cable from damage.</p> Signup and view all the answers

Why is it important to rotate pulleys that only turn through a small arc during an inspection?

<p>To inspect the entire surface of the pulley for wear, cracks, or damage.</p> Signup and view all the answers

What is the issue if I can see the pattern of the cable over the entire surface of the pulley groove?

<p>The pulley groove is worn, and the pulley needs to be replaced.</p> Signup and view all the answers

What is the purpose of the cable tensioner within the flight control system?

<p>To maintain the proper tension in the control cables, compensating for thermal expansion and contraction.</p> Signup and view all the answers

When adjusting the length of a "Push/Pull or Control Rod" assembly, how do you know that there is enough thread engagement inside of the rod end assembly?

<p>By ensuring that the rod end is threaded into the rod at least the minimum amount specified in the maintenance manual, and that there are no exposed threads beyond the rod end.</p> Signup and view all the answers

Which of the following statements about fairleads and rub strips is not correct?

<p>Fairleads must allow free cable movement without binding. Rub strips prevent chafing.</p> Signup and view all the answers

What device limits the control system travel at the output end of the system?

<p>Stops or limit switches.</p> Signup and view all the answers

What are the components of the Cessna Aileron Control System reviewed in class?

<p>Control wheel, cables, pulleys, pushrods, and ailerons.</p> Signup and view all the answers

What is the purpose of the down spring system used in the elevator system discussed?

<p>To provide a consistent feel to the pilot and prevent over-control.</p> Signup and view all the answers

On the small aircraft flap systems discussed, what controls the operation of the motor system moving the flap drive system?

<p>A flap selector switch in the cockpit.</p> Signup and view all the answers

What is the pivot point for a horizontal stabilizer trim system?

<p>A jack screw or trim tab.</p> Signup and view all the answers

Flashcards

Purpose of moving the control wheel right or left?

To control the aircraft's roll, causing it to bank left or right.

Purposes of floor-mounted pedals?

To control the rudder (yaw) and to apply the brakes.

Purpose of pushing the control column forward?

Pushing the control column forward causes the elevator to move downwards, pitching the nose of the aircraft down.

Common use for Non-flexible 1X7 or 1X19 control cables?

Used in applications where minimal flexibility is required, such as simple control runs or static applications.

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Common use for 1/8" diameter extra-flexible 7X19 control cables?

Used where high flexibility is needed, such as around pulleys or in tight bends. It is often found in primary flight control systems.

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Main purpose of rubbing a rag along a cable?

To check for frayed or broken strands, indicating wear or damage that could compromise the cable's strength.

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How to ensure a properly installed swaged-type terminal end?

Use a push-pull gauge to verify the cable meets the required tensile strength for the aircraft.

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Compressions on a 1/8" Nicopress sleeve?

Typically, two compressions are required when installing a Nicopress cable sleeve on a 1/8th inch diameter cable.

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When to replace a cable assembly?

Replacement is required when there is corrosion, fraying, or breakage of individual wires exceeding the limits specified in the AC 43:13-1B.

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Method to secure a turnbuckle?

Lock wire/safety wire is used to secure a turnbuckle.

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Maximum number of exposed threads on a turnbuckle?

A maximum of three exposed threads are allowed outside of the turnbuckle end when tensioning a cable system.

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Minimum wraps for single wrap lock-wire?

The minimum number of wraps at each end is four when using the single wrap 0.040 lock-wire method.

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What is the purpose of the Pulley Guard?

The pulley guard prevents the cable from slipping off or becoming misaligned from the pulley groove.

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Why rotate pulleys with limited arc of motion?

To check for adequate lubrication.

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Issue if cable pattern is visible on the pulley groove?

It indicates that the pulley is worn, damaged, or not properly matched to the cable size, potentially causing cable wear or failure.

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Purpose of the cable tensioner?

The cable tensioner is used to maintain the correct amount of tension in the flight control cables.

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How to know there is enough thread engagement?

Full thread engagement confirms the structural integrity of the assembly, preventing failure under load.

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Fairleads protect cables by

Fairleads guide cables, while rub strips protect from chafing.

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Device limits control system travel?

Stops limit the range of motion of a control surface, preventing over-travel that could damage the system or reduce aerodynamic effectiveness.

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Purpose of the down spring in elevator system?

The down spring system provides artificial feel to the pilot and helps return the elevator to a neutral position.

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Study Notes

  • These questions pertain to fixed-wing mechanical flight control systems and components

Control Wheel

  • Moving the control wheel right or left controls the ailerons
  • This action causes the aircraft to roll

Floor-Mounted Pedals

  • The floor-mounted pedals control the rudder
  • They are also used for differential braking

Control Column

  • Pushing the control column forward controls the elevator
  • This action causes the aircraft to pitch downward

Non-Flexible Control Cables

  • Non-flexible 1X7 or 1X19 control cables are used where there are straight runs

Flexible Control Cables

  • 1/8" diameter extra-flexible 7X19 control cables are used where cables must run around pulleys

Rag Test

  • Rubbing a rag along a cable run during an annual inspection can reveal broken cable strands

Swaged Terminal End Inspection

  • Proper installation is ensured by using a go/no-go gauge to confirm correct swaging

Nicopress Sleeve Compression

  • When installing a Nicopress cable sleeve on a 1/8th inch diameter cable, two compressions are required

Cable Wear Limits

  • According to AC 43:13-1B, cable replacement is needed if wear exceeds specific limits

Turnbuckle Securing Methods

  • Lock wiring or safety clips prevent rotation or twisting of the barrel once installed

Turnbuckle Thread Exposure

  • The maximum number of exposed threads on the cable end allowed outside of the turnbuckle end when tensioning a cable system is three

Turnbuckle Safety Wire Wraps

  • With a single wrap 0.040 lock-wire method, a minimum of 4 wraps at each end is needed for safety

Pulley Guard

  • The pulley guard prevents the cable from coming off of the pulley

Pulley Rotation

  • Pulleys that only turn through a small arc should be rotated to inspect the entire circumference for wear

Pulley Groove Issue

  • Seeing the cable pattern over the entire surface may indicate excessive wear, or a cable is the incorrect size for the pulley groove

Cable Tensioner

  • The cable tensioner maintains proper cable tension within the flight control system

Push/Pull Rod Adjustment

  • Enough thread engagement is known by visual inspection of the threads, or per the aircraft maintenance manual

Fairleads and Rub Strips

  • To ensure smooth operation and prevents damage, fairleads must align correctly, and not bind the cable. Rub strips are installed where the cable passes over structural members to prevent chafing.

Control System Travel Limits (Output)

  • Control stops limit the control system travel at the output end of the system

Control System Travel Limits (Input)

  • The device limiting control system travel at the input end of the system is the pilot's control column or stick

Cessna Aileron Control System

  • The Cessna Aileron Control System includes control stick, cables, pulleys, bellcranks, and ailerons

Elevator Down Spring System

  • The down spring system provides artificial feel and helps prevent over-controlling the elevator

Flap Drive System Control

  • On small aircraft, the flap switch in the cockpit controls the operation of the motor system

Horizontal Stabilizer Trim System Pivot

  • The pivot point for a horizontal stabilizer trim system varies by design but is typically a hinge point or actuator attachment point

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