BSS 7365 Aircraft Material Fire Test - Flame Spread Test of Thermal Insulation Material

The BSS 7365 standard, a Boeing Safety Standard, is based on 14 CFR (FAR) Part 25 Annex F, which is regulated by the American Federal Aviation Administration (FAA) and describes the flammability test requirements applicable to aircraft materials.

This test method is used to evaluate the flammability and flame propagation properties of thermal and acoustic insulation when exposed to both a radiant heat source and flame in a test chamber. Radiant heat is applied via an inclined electrical panel and directed to a horizontally mounted sample. The sides, ends and top of the chamber are insulated with fibrous ceramic insulation. The front has a high temperature, draft-free observation window. Below the window is a sliding platform that allows the user to easily place the calorimeter holding frame or the sample holding and fixing frames. The room temperature is monitored with a thermocouple.

During the test, flame duration, burning length and flame spread are recorded. The success or failure criteria of the result depend on the flame duration and burning length.

Briefly, the insulation flame spread test (or radiant panel test) is most commonly used to demonstrate compliance with 14 CFR 25.856(a).

The test sample requirements were determined as follows:

• The standard sample size is 32 x 58 cm for non-rigid materials and 29 x 58 cm for rigid materials.
• The sample thickness should be the same as that mounted on the aircraft.
• At least 3 samples should be tested.
• If the material reacts differently according to the direction in which it is cut, it should be tested in two directions. For example, woven materials should be tested by cutting 3 samples from the roll and cutting 3 samples across the roll.
• The test specimens should contain all the materials used to make the insulation (eg padding, film, scrim, tape, etc.).

Thermal insulation and acoustic insulation in all airframes require this test.

Among the numerous test, measurement, analysis and evaluation studies it provides for businesses in various sectors, our organization also provides flame spread test services of thermal insulation material in case of combustion of Boeing aircraft material, within the scope of BSS 7365 standard, with its trained and expert staff and advanced technological equipment.