011291500 — Avionics AFT Fan Repair & Overhaul

Component Overview

An avionics aft fan is a motor-driven axial or centrifugal blower within the air cycle and equipment-cooling architecture that draws cooling air across heat-generating avionics in the rear electronics bays, sustaining the forced-convection flow that keeps line-replaceable units within temperature limits. It typically comprises a brushless or brushed motor, a balanced impeller, bearings, and integral flow or fault sensing. Because it runs continuously, the dominant degradation modes are bearing wear and increased vibration, impeller imbalance from dust loading or erosion, loss of lubricant, winding insulation breakdown, and bearing brinelling. Symptoms include reduced airflow, elevated current draw, audible noise, and overtemperature warnings on cooled equipment, all of which drive bearing replacement, rebalancing, and motor refurbishment at overhaul.

Aircraft Application

Part number 011291500 (Avionics AFT Fan) is installed on the Dornier 328. QTC supports operators and MROs servicing this platform with certified repair and overhaul.

Our Repair Capability

QTC repairs and overhauls 011291500 to the original manufacturer's specifications under our FAA and EASA Part 145 approvals. Our team — including former OEM air cycle engineers — performs teardown, inspection, cleaning, component replacement, functional testing, and certification, returning a serviceable unit with the appropriate airworthiness release. We also develop repairs for rejected and beyond-economic-repair (BER) hardware.

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Frequently Asked Questions