129542-8 — Low Limit Temperature Sensor Repair & Overhaul

Component Overview

A low-limit temperature sensor is a sensing element in the environmental-control and air-management system that monitors duct or pack-discharge air temperature to protect against excessively cold conditions, signaling the temperature-control logic to prevent freezing, water-system icing, or overcooling. Typically a resistance temperature detector or thermistor in a probe housing with electrical termination, it provides a temperature signal used as a control or limit reference. Its primary function is accurate low-end temperature feedback for protective regulation. Service-related degradation includes element drift and calibration shift, open or shorted windings, moisture ingress and corrosion at terminals, lead and connector fatigue, and probe-sheath damage or contamination that slows response or biases readings. Repair and overhaul verify sensor resistance versus temperature, restore electrical and sealing integrity, and confirm response and accuracy against specification.

Aircraft Application

Part number 129542-8 (Low Limit Temperature Sensor) is installed on the Cessna 441. QTC supports operators and MROs servicing this platform with certified repair and overhaul.

Our Repair Capability

QTC repairs and overhauls 129542-8 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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Related Parts

Other low limit temperature sensor part numbers we repair — view all Low Limit Temperature Sensor parts →

Frequently Asked Questions