Mechanical Flight Control Systems and Components A3QA

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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 in turn control the roll of the aircraft.

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

To control the rudder and, in some aircraft, landing gear brake actuation, nose wheel steering.

What is the purpose of pushing the control column forward?

To lower the elevator, which in turn causes the aircraft to descend.

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

<p>For straight runs where flexibility is not required and the cable does not run over any pulleys, such as in trim systems or stabilizer controls.</p> Signup and view all the answers

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

<p>For primary flight controls such as ailerons, elevators, and rudders where flexibility around pulleys is needed.</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 on the cable. The rag can catch on frayed or broken strands, indicating damage to the cable.</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 using a go/no-go gauge to verify the swage diameter and performing a pull test to verify the strength of the connection.</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, but always refer to the manufacturer's specifications.</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 broken wires exceeding the allowable limit or when corrosion significantly weakens the cable.</p> Signup and view all the answers

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

<p>Locking clips, older turnbuckle protection use a Lock wiring or using safety clips.</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>Three threads.</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>4 wraps minimum wrap around the turnbuckle end.</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 other damage. This helps in identifying any issues as roughness, sharp edges, presence of foreign material embedded in grooves, flat spots, wear such as depressions and misalignment.</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>It indicates excessive wear on the pulley, which can damage the cable and affect control system performance.</p> Signup and view all the answers

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

<p>To allow for adjustment of cable tension to ensure proper control response and prevent cable slack or excessive tension.</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>Proper thread engagement should be verified by attempting to pass lockwire through the &quot;Witness Hole&quot;</p> Signup and view all the answers

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

<p>Incorrect statements will vary; however, fairleads guide cables to prevent chafing, and rub strips protect cables from abrasion. Fairleads and rub-strips are made of Phenolic, Phormica, or plastic. They are used where there is a likelihood of cable contact with a structure to prevent wear. They guide the cable and prevent cable vibration. They must not be used to change direction. Fairleads should be inspected for wear, breakage, alignment, cleanliness, and security. Rub-strips should be inspected to ensure they are secure and in good condition</p> Signup and view all the answers

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

<p>Primary stops, located near the control surface, limit the travel at the output end of the control system</p> Signup and view all the answers

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

<p>Ailerons, cables, pulleys, bellcranks, and control stick.</p> <p>Primary cable, chain ends, secondary cable turnbuckles, direct cable turnbuckles, push-pull rods, bellcrank stop bushings, aileron carry-thru cable, inclinometer.</p> Signup and view all the answers

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

<p>downspring system is used to assist in maintaining a nose-down attitude in turbulence</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 and associated electrical circuitry.</p> Signup and view all the answers

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

<p>The stabilizer pivots around its aerodynamic centre, which is near the tail's mean quarter-chord, to adjust the aircraft's pitch attitude. A jackscrew or trim tab actuator allows the pilot to trim aircraft for level flight.</p> Signup and view all the answers

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

<p>Secondary stops limit the travel of the input device near the control column or input end of the control system. Primary stops are located near the control surface and limit travel at the output end of the system</p> Signup and view all the answers

Flashcards

Control wheel movement

Causes the airplane to roll. Moving the control wheel to the right causes the right aileron to deflect upward and the left aileron to deflect downward, rolling the aircraft to the right.

Floor-mounted pedals

Used for rudder control (yaw) and differential braking.

Control column forward

Pushing the control column forward causes the elevator to deflect downward, resulting in a decreased angle of attack and causing the nose of the airplane to pitch down.

Non-flexible 1X7 or 1X19 control cables

Used in applications where flexibility is not a major concern, such as short, straight runs.

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1/8" diameter extra-flexible 7X19 control cables

Commonly used for flight controls due to its high flexibility and strength.

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Rubbing a rag on cable run

To check for frayed or broken wires.

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Verifying a swaged terminal end

Use a go/no-go gauge to verify proper swage dimensions.

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Compressions on 1/8" Nicopress sleeve

Two compressions.

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Cable replacement criteria (AC 43:13-1B)

When there is any visible corrosion or wear that reduces the cable diameter below the allowable limit.

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Turnbuckle securing method

Lock-wiring.

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Study Notes

  • Moving the control wheel to the right or left controls the ailerons, which affects the roll of the aircraft.
  • Floor-mounted pedals operate the rudder for yaw control and can also control differential braking for ground maneuvering.
  • Pushing the control column forward lowers the elevators, causing the aircraft to pitch nose down.
  • Non-flexible 1x7 or 1x19 control cables are typically used in applications where flexibility is not critical, such as straight runs with minimal bending.
  • 1/8" diameter extra-flexible 7x19 control cables are commonly used where high flexibility is needed, like around pulleys or in complex routing systems.
  • Rubbing a rag along a cable run during an annual inspection is for detecting frayed wires by feeling for snags on the rag.
  • Proper installation of a swaged-type terminal end on a cable is ensured by using a go/no-go gauge to verify correct swage dimensions and by performing a pull test to confirm the connection's strength.
  • When installing a Nicopress cable sleeve on a 1/8th inch diameter cable, typically two compressions are required on the sleeve.
  • In accordance with AC 43.13-1B, cable replacement is required when there is corrosion, broken wires, or wear that reduces the cable's original strength below acceptable limits.
  • Securing a turnbuckle with lock wire prevents rotation or twisting of the barrel once installed.
  • The maximum number of exposed threads on the cable end allowed outside of the turnbuckle end when tensioning a cable system is usually no more than three threads.
  • When using the single wrap 0.040 lock-wire method for safetying a turnbuckle assembly, a minimum of four wraps at each end is needed.
  • Pulley guards prevent the cable from coming off the pulley and protect the cable from external damage.
  • Rotating pulleys that only turn through a small arc is important during inspection to check for proper lubrication and any signs of wear or binding throughout the entire circumference.
  • Seeing the pattern of the cable over the entire surface of the pulley groove indicates that the pulley groove may be worn, causing improper cable seating and potential wear.
  • Cable tensioners maintain proper tension in the flight control cables and compensate for temperature changes and cable stretch.
  • When adjusting the length of a "Push/Pull or Control Rod" assembly, ensure sufficient thread engagement inside the rod end assembly by visually inspecting the number of exposed threads, typically requiring at least one thread to be visible.
  • Fairleads guide control cables, prevent chafing, and maintain proper alignment while rub strips protect surfaces from abrasion where movement occurs.
  • Travel is limited at the output end of a control system using mechanical stops.
  • Travel is limited at the input end of the system by the cockpit control's range of motion and internal stops.
  • The Cessna Aileron Control System includes control stick, cables, pulleys, bellcranks, and ailerons.
  • The down spring system used in the elevator system provides artificial feel and helps prevent over-controlling.
  • On small aircraft flap systems, a flap selector switch controls the operation of the motor system moving the flap drive system.
  • The pivot point for a horizontal stabilizer trim system is typically located at the horizontal stabilizer's attachment point to the aircraft's fuselage.

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