754691-2 — Cabin/ Duct Temperature Sensor Repair & Overhaul

Component Overview

The cabin/duct temperature sensor measures the temperature of cabin or distribution-duct air and provides that signal to the environmental control system for temperature regulation. Typically a resistance-based element such as an RTD or thermistor housed in a probe, it is installed in cabin zones, supply ducts, or mixing manifolds where its resistance varies with temperature, allowing the controller to modulate pack output, trim air, and mixing valves to hold the selected zone temperature. As a precision sensing device exposed to airflow, vibration, and thermal cycling, it is subject to calibration drift, resistance element degradation or open and short circuits, connector and wiring corrosion, probe contamination affecting response, and physical damage. Resistance and accuracy testing across temperature, with continuity and insulation checks, verifies serviceability or condemnation.

Aircraft Application

754691-2 is used across multiple aircraft platforms. Contact QTC with your aircraft type and we'll confirm applicability and repair scope.

Our Repair Capability

QTC repairs and overhauls 754691-2 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.

View Temperature Sensors & Switches capability →

Related Parts

Other cabin/ duct temperature sensor part numbers we repair — view all Cabin/ Duct Temperature Sensor parts →

Frequently Asked Questions