Proximity sensors reduce aerospace downtime

Downtime and costs in harsh environments can be reduced, says TTI, with the Honeywell IHM (Integrated Health Monitoring) series aerospace proximity sensors.

The company claims that its patented FAVCO (Fixed Amplitude Variable Current Oscillator) technology circuit. The sensor is considered an improvement on traditional ECKO (Eddy Current Killed Oscillator) topology, which was the previous standard for aerospace applications, with non-contact, hermetically-sealed configurable design, for rugged operation in landing gear and thrust reversers.

They can be used to indicate the status of doors (open/closed/locked); cargo loading latch detection (pallet locked); evacuation slide door-lock mechanism (correct actuation); flight controls (flap and slat skew/position and spoiler position); landing gear (up lock, down lock and weight on wheels) and thrust reverser actuation system (TRAS) (stowed or deployed status).

The non-contact devices designed to sense the presence or absence of a target, providing on/off output, are designed for use in harsh duty aircraft applications. They can also be configured with an optional health monitoring output to the host system. They are, says the company, accurate and reliable to lower maintenance costs and reduce downtime.

The IHM series aerospace proximity sensors detect and display a greater percentage of internal failure modes than competitive products, claims the company.  According to the company, they feature industry-leading levels of indirect lightning and dielectric ruggedness to meet the increased requirements of today’s composite aircraft, as well as superior vibration resistance. They have a hermetically-sealed, all-welded stainless steel construction for exceptional robustness and durability in harsh environments, eliminating any potential for contamination. Due to their non-contact design technology, the sensors detect presence or absence of a target regardless of the often very dirty conditions in which they operate, thereby eliminating mechanical failure mechanisms, increasing revenue and reducing maintenance costs by increasing MTBFs and so minimising downtime.

The optional third output state indicates the health of the sensor (whether operating optimally or failed), claimed to reduce maintenance time and delayed flights, helping to lower overall maintenance costs across the lifetime of the aircraft.


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