Hartzell’s Tanis Preheat Systems Approved for Airbus H135 Helicopters

Why Engine Preheat Systems Matter for Helicopter Operations

In March 2025, Hartzell Propeller achieved a milestone with Supplemental Type Certificate (STC) approval for Tanis Helicopter Preheat Systems on Airbus H135 aircraft. This certification validates years of engineering work to address cold-weather challenges in aviation – a critical concern for operators in regions like Scandinavia, Canada, and high-altitude rescue bases.

The Airbus H135’s global deployment across 60+ countries makes this STC particularly impactful. With over 1,350 units in service for EMS, law enforcement, and utility operations, reliable cold-weather performance isn’t optional – it’s a safety imperative. Frosted spark plugs or sluggish oil flow during Arctic medevac missions could mean life-or-death delays.

How Tanis Systems Enhance Helicopter Performance

Tanis’ patented heating elements maintain optimal engine temperatures through:

1. Precision heating of engine cylinders (targeting 100-120°F)

2. Battery warming for reliable starts at -40°F

3. Drivetrain component protection against thermal shock

California Shock Trauma Air Rescue (CALSTAR), operating 12 H135s, reported a 63% reduction in cold-start maintenance issues during 2024 winter trials. Their mechanics noted decreased carbon buildup on turbine blades and extended oil change intervals.

“A 2024 study by Airbus Helicopters found preheated H135 engines achieve full operational readiness 12 minutes faster in 20°F conditions – crucial for organ transport missions.”

Technical Specifications and Installation

The STC-approved kits (TA3391-1 for 115V/US, TA3391-2 for 230V/EU) integrate with:

– Pratt & Whitney Canada PW206B2 engines

– Dual-channel temperature monitoring

– Automatic shutoff at 140°F

Installation requires 28 labor hours according to Hartzell’s certification documents. Norwegian operator Norsk Helikopterservice completed retrofits on their 9 H135s in Q4 2024, reporting full ROI within 18 months through reduced fuel burn during warm-up.

Industry Implications and Future Developments

This approval signals broader shifts in aviation maintenance practices. The European Union Aviation Safety Agency (EASA) now recommends preheat systems as standard equipment for all turbine helicopters operating north of 45° latitude.

Market Response and Operator Benefits

Key financial impacts include:

– $17,115 kit cost vs $42,000 average engine overhaul expense

– 300+ hour annual utilization increase for cold-climate operators

Airbus Helicopters’ 2025 product catalog now lists Tanis systems as factory-approved options. Hartzell reports a 217% YOY increase in preheat system orders since the STC announcement.

“Our Bavarian H135 air ambulance fleet maintains 98% winter availability since installing Tanis – up from 74% previously.”
– Klaus Berger, Technical Director, DRF Luftrettung

Technological Advancements in Aircraft Maintenance

Hartzell’s merger of Tanis and Reiff technologies creates new possibilities:

– Predictive heating algorithms using OBD-II data

– Solar-compatible power modules for remote bases

– Integration with Health and Usage Monitoring Systems (HUMS)

At Verticon Dallas 2025, prototypes demonstrated IoT-enabled systems that auto-activate when temperatures drop below 50°F, syncing with maintenance logs via blockchain.

Conclusion

The Tanis STC approval represents more than regulatory compliance – it’s a paradigm shift in helicopter operations. By addressing the physics of cold-weather mechanics (metal contraction, oil viscosity changes, battery chemistry limitations), Hartzell enhances both safety and economics for H135 operators.

Looking ahead, expect preheat systems to become integrated with electric VTOL aircraft and hydrogen-powered engines. As climate patterns shift, reliable cold-weather operation transitions from niche requirement to universal aviation standard.

FAQ

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Q: Why use preheat systems above 32°F?br>
A: Engine manufacturers recommend preheating below 50°F to prevent differential metal expansion between cylinders and crankcases.

Q: How do Tanis systems differ from engine blankets?
A: Blankets retain heat; Tanis actively heats components to precise temperatures using thermostatically controlled elements.

Q: Can these systems be used with biofuels?
A: Yes – testing shows improved biofuel combustion consistency when engines are preheated to 110°F minimum.

Sources:
Hartzell Propeller,
GlobalAir,
Aviation Defence Universe