STC's and Conversions
For Piper PA31-310 Navajos & PA31-325 Navajos
The Colemill Panther conversion improves the performance and safety significantly.

Installation of 350 horsepower turbo-charged engines and 4-blade "Q-Tip" propellers optimize the power/weight ratio of the small-body Navajo. The result is superior performance.


  • Climb 2000 fpm (gross) at sea level
  • Single-engine climb 400 fpm (gross) at sea level
  • Max speed increased to 275 mph at 15,000 ft.
Your Colemill Panther conversion includes...
  • Lycoming TI0540J2B, 350 horsepower, turbo-charged engines
  • Dual drive magnetos
  • New Hartzell 4-blade "Q-Tip" propellers with governors and synchrophaser
  • Propeller spinners
  • Shadin digital fuel management computer
  • New vacuum pumps, lord mounts, fuel and oil hoses
  • Only 15 working days downtime
Optional Accessories
  • Un feathering Accumulators
  • Winglets
Price Sheet
CONVERSION PRICES INCLUDE REPAIRING OR REPLACING RUBBER BAFFLING.
CONVERSION PRICES DO NOT INCLUDE: REPAIRING METAL BAFFLING, AIRBOXES, OR EXHAUST SYSTEM, FUEL COSTS FOR TEST FLYING.

Panther Articles
Colemill Panther Quiet Sound & Great Looks Attract Attention
New Engines Make the Colemill Panther a better choice than ever
Aircraft Owners Come Thousands of Miles for Colemill Service
Panther Popularity Is Worldwide
Colemill Modifications Are Much More than an engine swap
Panther Power too Good to Wait for

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