Collective Pull Down®

Critical Safety Device for Low Rotor RPM Events

The Collective Pull Down (CPD) is an FAA approved aftermarket safety device that initiates the lowering of collective in the event of an engine or drive system failure.


How it Works

The low rotor RPM warning signal triggers the device to pull the collective down in less than half a second, eliminating pilot recognition and reaction times. Whether you experience an engine or drive system failure, the CPD initiates the correct pilot action in-time, every-time. The CPD can be easily overridden by the pilot as required. It is lightweight, easy to install, requires no software, doesn’t take up any cockpit or baggage space, and is reasonably priced. But ultimately, can anyone put a price on the life of a pilot and passengers?


By the Numbers

Rotorcraft owners and pilots are smart and conscientious about maintaining their aircraft and planning their flights. The belief is that loss-of-power is a low probability event when a meticulously maintained aircraft is being flown by a highly experienced pilot. Yet, accidents do happen and no pilot, novice or seasoned, is immune.

  • Nearly 1/3 of all helicopter accidents involve autorotation events.
  • Low-Rotor RPM during autorotation entry accounts for up to 15% of all fatal helicopter accidents.
  • Approximately 42% of accidents occur during personal/private flights or during instruction.
  • According to the Flight Safety Foundation, pilots take, on average, 2-3 seconds to recognize that a problem is occurring and then another 4-6 seconds to react.

Split-Second Safety

If a pilot delays their reaction and allows the main rotor speed to decay below a certain speed, loss-of-control of the aircraft can be catastrophic. The CPD recognizes and reacts for the pilot in less than half a second, giving them a critical edge in maintaining proper rotor RPM for autorotation entry.

“​The HeliTrak CPD improves operational safety for any helicopter operation. Combined with good Aft Cyclic procedures, it gets the pilot moving in the right direction at the right time for low-rotor RPM events like those caused by engine and drive system failures.”

Pete Gillies - Chief Pilot (Retired), Western Helicopters

“I have been involved in helicopter flight training and working with private owners of helicopters for over 3 decades now. We are always on the lookout for new products and services that can enhance the safety of our operations and those of our customers. In my opinion, the HeliTrak Collective Pull Down (CPD) device provides for an increased level of safety, and under some circumstances may even perform a lifesaving function in a low rotor RPM event. I would encourage all R22 and R44 operators, and especially private owners who operate these helicopters, to consider the safety benefit of the HeliTrak CPD.”

Neil Jones - President / Owner, Quantum Helicopters, Chandler, Arizona

Features at a Glance

  • Initiates the critical collective-lowering segment of autorotation entry when the low RPM warning activates.
  • Completes required pull down action in approximately 0.5 second, giving the pilot more time to react.
  • Provides tactile warning of engine or drive system failure and low RPM situation.
  • Builds muscle memory of correct action for low RPM events.
  • Allows pilot to override and control the collective during the pull-down action.
  • Lightweight modular design for quick and easy installation.
  • Small footprint that doesn’t take up cockpit or baggage space.
  • Improves rotorcraft safety, and brings peace of mind to a pilot’s passengers and family.


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Collective Pull Down Details

Total System Weight
2.0 lbs
CPD Assembly Dimensions: R22
8.1" L x 5.9" W x 2.3" H
CPD Assembly Dimensions: R44
8.0”L x 2.5”W x 3.3”H
Qualification Testing
RTCA/DO-160G Environmental Specifications
Supplemental Type Certificate #SR02506SE
14V and 28V Systems Available
8,360,369 | 8,910,909 | 8,651,425 | 9,511,856
Additional patents pending in the U.S., Europe, China and other jurisdictions around the world.


HeliTrak Collective Pull-Down (CPD) Demonstration with Chris Horton

HeliTrak Autorotation Contest Recap

HeliTrak Collective Pull-Down (CPD) Demonstration with Ron Gustafson, DPE

HeliTrak Collective Pull-Down (CPD) Demonstration with Bruce Latvala

HeliTrak Autopilot

Our Upcoming Safety Product for the R44