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As static aircraft engine noise ground tests are usually less costly than flight tests and are less affected by atmospheric conditions, ground surface variations, flight paths, etc. and, therefore, more predictable, they are preferable to flight tests. After the initial aircraft noise certification, aircraft manufacturers do not need to do a full noise certification test on new engines or engines that have been modified. They can get the new (or modified) engines noise certified by the authorities via the Ground to Flight Equivalence (GTFE) procedure.

The Brüel & Kjær Static Engine Certification Test (SECT) system follows the measurement requirements and procedures set forth by the industry noise certification standards ICAO FAR 36 and Annex 16, and SAE ARP1846A and ARP866A – Standard Values of Atmospheric Absorption as a Function of Temperature and Humidity.

 

System Suggestion

Static engine noise certification system overview

The SECT System accurately performs all the tasks needed for static engine noise certification and development testing and is based on our PULSE data acquisition and analysis platform and other standard commercial-off-the-shelf products that cover the entire measurement chain. It acquires all relevant noise and weather data needed to generate certificated noise levels, and corrects this data to standard reference conditions, for both measurement equipment and atmospheric absorption.

As SECT System is an open framework, additional research and development tasks (based upon individual customer requirements) can be added or incorporated within the workflow of the system. 

TYPE 4192-B-001

1/2" Pressure-field Microphone with Type 2669-B Preamplifier, Ext. Polarized

Pressure-field microphone designed for high-precision coupler measurements or ANSI noise measurements with a frequency response of 3 Hz to 20 kHz.

TYPE 2669-B

1/2-inch microphone preamplifier, tapered

Preamplifier Type 2669-B is designed to operate over a wide range of temperatures, humidity, and other environmental conditions.