Helix Carbon Fiber Propellers

Noise Measurement

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Noise Measurement

Certified aircraft decibel measurement

Check your decibels.

Research Airfield Noise Measurement Center

Aachen-Merzbrück

Have Microphone, Will Travel.

Helix is proud to offer certified noise measurement services across Germany. 

LFA is a collaboration between FH Aachen - University of Applied Sciences and Helix-Carbon GmbH.

This collaboration has been granted approval by the German Federal Aviation Office (Luftfahrt-Bundesamt) to conduct noise measurements according to ICAO Annex 16, Chapter 10, as well as in accordance with the Noise Regulation (LVL) on propeller aircraft with a maximum takeoff mass of up to 8618 kg, helicopters with a maximum takeoff mass of up to 3175 kg, ultralight aircraft with a maximum takeoff mass from 472.5 kg to 650 kg, and autogyros with a maximum takeoff mass from 560 kg to 650 kg.

*LFA: Lärmmessstelle Forschungsflugplatz

In cooperation with:

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Schedule your aircraft noise certification test now.

Ensure compliance and peace of mind by scheduling your aircraft noise certification test with us today. Our efficient and thorough testing process guarantees accurate results, helping you meet necessary regulatory requirements.

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Information to Noise Measurement Procedure:

Before you fly:

Before requesting an appointment, please have the following information ready:

  • Your contact information
  • Make and model of your aircraft
  • Motor
  • Propeller
  • Rate of Climb (R/C)
  • Speed of Climb (Vy)
  • 50ft Takeoff Distance


Let us know if you need help gathering or locating this information.

Weather Conditions:

In order to complete a valid noise measurement, the following Meteorological conditions must be met:

  • There can be no precipitation
  • Relative humidity at 1.2 meters above the ground must be between 20% and 95%
  • Ambient temperature at 1.2 meters above the ground must be between 2° and 35° celcius
  • The ground must not be frozen
  • Wind speed at 1.2 meters above the ground may be a maximum of 5.3 m/s
  • The crosswind component may be a maximum of 2.5 m/s

Noise Limits:

The noise measurements according to Chapter 10 must be carried out for propeller aircraft and motor gliders with a maximum takeoff mass of 8618 kg as follows:

Noise limits for Group 1 - Application for type certification before November 4, 1999:

Max Takeoff Mass:

1400 to 8618 kg

Noise Limit:

88 dB(A)

Max Takeoff Mass:

600 to 1400 kg

Noise Limit:

83.23 + 32.67 × log × (M/1000kg) dB(A)

Max Takeoff Mass:

600 kg or less

Noise Limit:

76 dB(A)

Noise limits for Group 2 - Application for type certification after November 4, 1999:

Max Takeoff Mass:

1500 to 8618 kg

Noise Limit:

85 dB(A)

Max Takeoff Mass:

570 to 1500 kg

Noise Limit:

78.71 + 35.7 × log × (M/1000kg) dB(A)

Max Takeoff Mass:

570 kg or less

Noise Limit:

70 dB(A)

Noise limits for Group UL-600: Heavy Ultralight Aircraft with a maximum permissible takeoff mass of over 472.5 kg and under 650 kg

Max Takeoff Mass:

570 to 650 kg

Noise Limit:

70 dB(A)

Max Takeoff Mass:

472.5 to 570 kg

Noise Limit:

M × 10/97.5 + 11.538 dB(A)

Max Takeoff Mass:

472.5 kg or less

Noise Limit:

60 dB(A)

Noise limits for Gyroplanes with a maximum permissible takeoff mass of over 560 kg and under 650 kg

Max Takeoff Mass:

570 to 650 kg

Noise Limit:

70 dB(A)

Max Takeoff Mass:

560 to 570 kg

Noise Limit:

M/5 - 44 dB(A)

Max Takeoff Mass:

560 kg or less

Noise Limit:

68 dB(A)