BSS 7322 Aircraft Material Fire Test - Heat Release Rate

In the BSS 7322 standard, a Boeing Safety Standard, compliance with the requirements of the FAR 25.853 standard designed by the American Federal Aviation Administration (FAA) is sought. Accordingly, heat release rates are taken into account by materials and products when exposed to a certain level of radiant heat. This standard describes a test method that measures and describes the properties of materials in response to heat and flame under controlled laboratory conditions. With this test method, heat release from the injection, ignition time and gradual flame ignition of the surface are determined.

The sample requirements used in this test method were determined as follows: 6 pieces 150 mm x 150 mm x 45 mm MT.

For the purposes of this standard,

• The heat dissipation (2 minutes total) refers to the amount of heat energy emitted.
• The heat release rate (peak) represents the rate of heat energy released. The maximum heat release rate occurs when the material is burned most intensely.
• The heat flux density expresses the density of the thermal environment that the sample is exposed to when burned.

This test method is based on the following principles:

• constant airflow
• Radiant heat source - desired heat flow
• vertical orientation
• Point ignition / ignition of emitted gases
• Heat release rate = Changes in exhaust temperature

Another standard used to determine the heat release rate in aircraft material fire tests is the ASTM E906 standard developed by the American Testing and Materials Organization (ASTM) (the standard test method for heat and apparent smoke release rates for materials and products using the ASTM E906-09 Thermopile method). The test method described in this standard enables the determination of the release rates of heat and visible smoke from materials, products or assemblies exposed to different levels of radiant heat. Visible smoke is defined in terms of dimming of transmitted light caused by combustion products released during tests.

Our organization, with its trained and expert staff and advanced technological equipment, among the numerous test, measurement, analysis and evaluation studies it has given for businesses in various sectors, Within the scope of the BSS 7322 standard, Boeing also provides heat release rate testing services in case of combustion of aircraft material.