Call Avcon Industries:   +1 (316) 284-2842

Enhanced Capabilities for
Legacy Business Jets

The Avcon R/X Mod increases the maximum flight range and weight of legacy Learjet aircraft, enhancing the operational capabilities of the aircraft both as a business jet and a mission platform.

With increased range and flight time capabilities, additional weight capacity, and aerodynamic improvements, a Learjet equipped with the Avcon R/X Mod offers increased revenue and mission flexibility to owners and operators.

The Avcon R/X Mod is available for Learjet models 35, 35A, 36, and 36A. Avcon Fins are also available for the Learjet 25D. The modification is fully compatible with the ZR-LITE Performance System from Raisbeck Engineering.

Increased Stability

Avcon Fins

  • Eliminate the FAA requirement for operable yaw dampers
  • Give the aircraft solid and predictable handling characteristics
  • Smooth airflow around the tailcone, reducing drag
  • Facelift exterior appearance, matching strakes on modern Learjets

Avcon fins attach to the tail-cone of the aircraft (much like the feathers on an arrow), combining with the vertical stabilizer to create positive stability in all three axes. As a result, Learjets equipped with Avcon fins demonstrate enhanced smoothness and control response both while cruising and at low airspeeds.


“The strakes achieve not only better stability or shall I say 100% improved stability on approach, but they also eliminate in event of failure both horizontal stabilisers which are a No Go item on the LearJet 35/36.”
CRG Hellinger, African Pilot Magazine

Aligned to provide aerodynamic stability, the fins help the aircraft ‘self-correct’ when it begins to stray from the intended line of flight (for example, during turbulence) — controlling yaw and keeping the aircraft on the step for optimal range performance. During landing and other low-speed maneuvers, Avcon Fins eliminate divergent dutch roll tendencies by providing additional lift and directional stability. As a result of their effectivity, Learjets equipped with Avcon fins do not require operable yaw dampers.

The fins not only bring the exterior into line with the fins on later Learjets (including the 45, 55, and 60), but result in less drag, more aerodynamic stability, and an aircraft that simply flies better.

Jump to Pricing
mods_performance_rx-map.svg mods_performance_rx-table.svg
With Avcon R/X* Standard Lear 36**
Ramp Weight 19,805 lbs 18,500 lbs
Takeoff Weight 19,600 lbs 18,300 lbs
Landing Weight 16,000 lbs 15,300 lbs
Zero Wing & Tip Fuel Weight 14,500 lbs 13,500 lbs

* Estimates for Learjet 36 / 36A with Avcon R/X Weight Increase Package.

** Example figures only. Details for your Learjet may vary due to configuration and equipment, including landing gear. Please see your Learjet Pilot Training Manual when determining maximum weight figures.

Increased Range

Tip Tank Extensions

The Avcon R/X mod adds room for 750lbs of additional usable fuel in the aircraft’s tip-tanks, providing up to 40 minutes of additional flight time at normal cruise speeds and altitudes. By maintaining the same tip-tank diameter, increased drag is minimized to virtually zero.

In addition, the modification package installs Avcon fins, improving lift and stability.

Fuel and Flight Time Improvements

  • Fuel Capacity: + 750 lbs (340.2 kg)
  • Flight Time: + 40 minutes*

IFR Range Estimates with Full Fuel:**

  • Lear 35:> 2,100 Nautical Miles
  • Lear 36:> 2,800 Nautical Miles

* Under normal conditions at cruising speeds and altitudes.

** Based on conservative extrapolation of data published in B/CA Annual Planning and Purchasing. True range may vary based on jet configuration and environmental factors such as weather and headwinds.

Increased Payload

Weight Increase Package

With the aerodynamic enhancements provided by Avcon fins, maximum weight can be increased (with landing gear AAK 80-3 or equivalent).

The weight increases are FAA approved, and result in a net increase in useful load of almost 1,200lbs – enough for an additional two passengers with luggage, even when the aircraft is fully loaded with fuel.

Max Weights with Avcon Fins & Weight Increase Package:*

  • Ramp Weight: 19,805 lbs (8981 Kg)
  • Takeoff Weight: 19,600 lbs (8890 Kg)
  • Landing Weight: 16,000 lbs (7257 Kg)
  • Zero Wing & Tip Fuel Weight: 14,500 lbs (6577 Kg)
  • Δ Useful Load: + 1,200 lbs (544.3 Kg)

* Estimates for Learjet 36 / 36A with Avcon R/X Weight Increase Package.


Pricing information is available upon request.

Contact Us »