129666-3

PC CTRL VALVE SENSOR
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About this product
The 129666‑3 sensor is the temperature and position feedback element for the precooler control valve in aircraft environmental control systems. Installed in the bleed‑air precooler assembly, it monitors valve actuator position and downstream air temperature to ensure precise regulation of hot bleed air before it enters the air cycle machine. By providing real‑time data to the ECS controller, this unit helps maintain optimal pack performance, protecting downstream components from overtemperature and improving cabin climate stability.
129666-3 Datasheet
UOM: EA
Stock Location: Dubai
Hazardous Item: Non-Hazardous Item
Life Limited Part: No
Lead Time: Stock
Certification: Dual Release
8130/EASA Eligible: Yes
PRODUCT DESCRIPTION

129666-3

  • High‑Accuracy Temperature Sensing: Calibrated thermistor element delivers ±1 °C precision across –40 °C to 200 °C, enabling tight control of bleed‑air temperature.

  • Integrated Position Feedback: Hall‑effect sensor monitors valve stem movement with ±0.5° angular resolution, ensuring accurate valve positioning under all load conditions.

  • Wide Operating Range: Ruggedized electronics and materials rated for continuous exposure to 200 °C bleed‑air and vibration up to 10 g rms.

  • Corrosion‑Resistant Construction: Stainless‑steel body and aerospace‑grade seals resist hydraulic fluids, deicing chemicals, and environmental moisture.


  • Providing closed‑loop feedback for ECS controllers to maintain cabin temperature and pressure.

  • Secures air cycle machines by preventing overtemperature conditions that can damage heat exchangers and turbines.

  • Supporting retrofit and modernization programs for legacy bleed‑air systems requiring precise thermal management.

  • Enabling ground‑based bench testing of precooler valves during maintenance checks and ECS troubleshooting.


  • What is the primary function of the 129666‑3 sensor?

It measures both bleed‑air temperature and precooler valve position, supplying feedback to the ECS controller for accurate thermal regulation.

  • How is the unit qualified for high‑temperature service?

Components are rated for continuous 200 °C operation, with vibration and thermal testing per RTCA DO‑160 standards.

  • What happens if the sensor fails?

ECS controllers default to a safe bleed‑air schedule or shut off the valve, prompting a cockpit warning and preventing overtemperature damage.


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