Overtemperature Switch Repair & Overhaul
FAA & EASA certified overtemperature switch repair and overhaul.
About the Overtemperature Switch
An overtemperature switch is a thermally actuated sensing device that signals or trips a protective circuit when monitored air, duct, or component temperature exceeds a preset threshold. Within the sensors and switches domain, it protects pneumatic, bleed-air, and conditioned-air systems by detecting duct overheat or leak conditions and triggering shutoff, warning, or isolation logic. The switch typically uses a bimetallic element, gas-filled bellows, or eutectic sensor that mechanically actuates electrical contacts at the set point. Repair and overhaul are driven by contact pitting, erosion, and welding from switching cycles, calibration drift of the actuation setpoint, bimetal or bellows fatigue and creep, seal and housing degradation under repeated thermal cycling, corrosion, and electrical terminal and insulation deterioration that cause nuisance trips or failure to actuate at the required temperature.
Our Overtemperature Switch Repair Capability
QTC repairs and overhauls overtemperature switch components to the original manufacturer's specifications under our FAA and EASA Part 145 approvals. Our engineers — including former OEM sensors & switches specialists — perform teardown, inspection, cleaning, component replacement, functional and leak testing, and certification, and develop repairs for rejected and beyond-economic-repair (BER) hardware.
All Overtemperature Switch Parts We Service
Click a part number for repair details and to request a quote.
| Part number | Make | Model |
|---|---|---|
| 750659-1 | — | Various |
| 750659-10 | — | Various |
| 750659-11 | — | Various |
| 750659-12 | — | Various |
| 750659-13 | — | Various |
| 750659-14 | — | Various |
| 750659-15 | — | Various |
| 750659-16 | — | Various |
| 750659-17 | — | Various |
| 750659-18 | — | Various |
| 750659-3 | — | Various |
| 750659-4 | — | Various |
| 750659-5 | — | Various |
| 750659-6 | — | Various |
| 750659-7 | — | Various |
| 750659-8 | — | Various |
| 750659-9 | — | Various |
| 750665-1 | — | Various |
| 750665-10 | — | Various |
| 750665-2 | — | Various |
| 750665-3 | — | Various |
| 750665-4 | — | Various |
| 750665-5 | — | Various |
| 750665-6 | — | Various |
| 750665-7 | — | Various |
| 750665-8 | — | Various |
| 750665-9 | — | Various |
Frequently Asked Questions
Does QTC repair overtemperature switch components?
Yes. QTC repairs and overhauls overtemperature switch components under our FAA & EASA Part 145 approvals. Our catalog lists 27 overtemperature switch part numbers. Request a quote to confirm capability and turnaround.
What aircraft use the overtemperature switch?
Overtemperature Switch part numbers in our catalog span multiple aircraft platforms. See the full parts list below.
What is involved in overtemperature switch repair and overhaul?
Our process typically includes incoming inspection, disassembly, cleaning, non-destructive evaluation, repair or replacement of worn elements, functional/leak testing, and certification with the appropriate airworthiness release.
Request a Quote for Overtemperature Switch Repair
Send us your part numbers and condition. Our engineers respond with repair scope, turnaround, and pricing.