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1. Engine Run-Up Test

• Conduct a full-throttle engine run-up for 1-2 minutes.

• Check ESC temperature:

  • If above 120°F (49°C), consider installing a cooling fan or replace ESC.

• Listen carefully for out-of-sync motors:

  • Slight differences are normal; significant mismatches require ESC recalibration.

  • To recalibrate:

    1. Power on aircraft with throttle at maximum.

    2. Await ESC confirmation tones.

    3. Move throttle to idle position.

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2. Fan and Nacelle Inspection

• Verify fans are firmly mounted and secured within each nacelle.

• Ensure blades do not touch nacelle walls to prevent ESC damage.

  • Adjust fit by adding tape shims if necessary.

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3. Control Surface and BEC Check

• Move all control surfaces through their full range during engine run-up.

• Confirm there's no brownout or unexpected reset.

• Verify correct failsafe settings and control surface direction multiple times.

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4. Center of Gravity (CG) Check

• CG Position: 114mm forward from wing root trailing edge on F5B.

• Typical battery location: Midpoint between formers F5A and F4.

• Ensure the battery is securely fastened.

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5. Recommended Control Throws

• Elevator: ±25mm

• Ailerons: ±30–35mm

• Rudder: ±20–30mm

• Nosewheel Steering: ±45° minimum (Servos with more than 60 degrees of travel recommended for tighter turns)

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6. Expo Settings (Recommended)

• Elevator: 20–30%

• Ailerons: 5–15%

• Rudder: 10–15%

• Nosewheel Steering: ~45% for straight tracking on ground roll.

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7. Landing Gear Check

• Spin each wheel manually to ensure smooth rotation.

• Identify and address any wheel or bearing drag before flight.

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8. Gyro Stabilization (First Flight Recommendation)

• Do not use gyro stabilization on maiden flights.

• The HM3D 74X-i2A provides naturally stable flight characteristics without a gyro.

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9. Throttle Trim Adjustment (Optional)

• Slightly increase throttle trim so engines idle gently at zero throttle position.

• Benefits include smoother ground handling, gentler transitions, and realistic engine operation.

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10. Initial Flight Expectation

• Anticipate a moderate pitch-up and steep climb at full throttle after rotation.

• Be prepared to trim nose-down as necessary.

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11. Slow Flight Handling Familiarization

• At altitude, gradually apply maximum elevator and manage throttle to sustain level flight.

• Practice slow flight, noting how throttle controls altitude.

• Maintain wings-level attitude primarily using ailerons; be cautious of rudder input causing adverse yaw and reduced airspeed.

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12. LW-PLA Heat & UV Advisory

• Avoid direct sunlight exposure to LW-PLA components. They will buckle and distort in direct sunlight at warmer temps.

• Best flight times are early mornings for roughly 2 Hrs after first light, evenings around 90 mins before sunset, or during overcast conditions.

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Perform these checks before every flight to ensure safety, reliability, and optimal flight performance of your HM3D 74X-i2A Airliner.