5409C000 — Bay Temperature Sensor Repair & Overhaul

Component Overview

The bay temperature sensor monitors the air temperature within equipment bays and compartments, providing the signal used to manage cooling and to trigger overheat protection for the housed systems. Usually a resistance-based probe such as an RTD or thermistor mounted in an avionics, electronics, or equipment bay, it tracks compartment temperature so controllers can adjust cooling airflow and annunciate overtemperature conditions that could damage equipment. Operating in a vibration- and heat-exposed environment, it is subject to calibration drift, sensing-element degradation with open or short circuits, connector and lead corrosion, contamination and mounting deterioration that slow response, and mechanical damage. Resistance-versus-temperature accuracy testing, along with continuity and insulation-resistance checks, confirms that the sensor reports compartment temperature reliably or identifies it for replacement.

Aircraft Application

Part number 5409C000 (Bay Temperature Sensor) 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 5409C000 to the original manufacturer's specifications under our FAA and EASA Part 145 approvals. Our team — including former OEM sensors & switches 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