Xinxiang Filter

Description:

Avionics Bay Coarse Air Filter Cartridges are front-end filter devices specially designed for the environmental control systems of civil aircraft avionics bays, used to capture solid particulate contaminants in cooling air for avionics equipment. Designed in compliance with aviation airworthiness standards, this product intercepts large pollutants with particle size ≥5–10 μm, featuring low initial pressure drop and long service life. It serves as a critical component to guarantee reliable operation of avionics equipment.

Core Technical Advantages:

Three-layer composite filter structure: The cartridge consists of three layers of flame-retardant polyurethane foam (outer, middle and inner layers) to form gradient filtration. The outer layer intercepts coarse dust and hair, the middle layer adsorb medium-sized particles, and the inner layer ensures uniform airflow distribution, delivering high filtration efficiency and large dust holding capacity.

Aviation-grade flame retardancy: The filter media adopts flame-retardant polyurethane foam complying with FAR 25.853 aviation interior flammability standard to eliminate fire hazards.

All-metal frame support: Both inner and outer frames are fabricated by punching aluminum plates, rolling into cylinders and welding, featuring high strength, light weight and corrosion resistance.

Working Condition Matching Table:

Application Fields:

Avionics ventilation systems of civil transport aircraft

Environmental control for aircraft avionics bays

Avionics equipment bays for general aviation and business jets

Ventilation protection for helicopter avionics systems

Ground transportation (extended application)

Ventilation filtration for rail transit traction control systems

Air purification for electronic control cabinets of special vehicles

Case & Data Verification

Avionics bay coarse air filter cartridges with 5 μm filtration accuracy and flame-retardant polyurethane foam media were supplied to a civil aviation maintenance company in Shenzhen. Under identical test conditions, the pressure drop of this coarse filter is half that of OEM parts, all reaching G4 average gravimetric efficiency grade. At equivalent average gravimetric efficiency, its dust holding capacity is nearly 3 times that of OEM filters.

FAQ:

Q1: Does this filter meet aviation flame retardant requirements?
A: Yes. The filter media is flame-retardant polyurethane foam satisfying FAR 25.853(a) vertical burn test requirements, capable of self-extinguishing within specified time after flame removal.

Q2: Is airworthiness approval mandatory for the filter?
A: Filters installed on airworthy aircraft shall hold FAA-PMA or EASA certification, or be OEM original parts. Our products can provide complete traceability documents and airworthiness approval certificates.

Q3: How to determine filter replacement timing?
A: Mainly by monitoring the differential pressure across the filter. Replacement is required when the differential pressure doubles the initial value or exceeds the equipment alarm threshold. Periodic replacement can also be scheduled during C-check or after specific flight hours per maintenance plan.