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Learjet Model 31


ZR LITE Performance System

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Fly higher, faster and farther. Use less fuel along the way!

The ZR LITE Performance System improves the take-off, climb, cruise, and descent performance of the Lear 31 series aircraft. Raisbeck's ZR LITE technology utilizes state-of-the-art components specifically engineered to reduce wave pressure, interference and induced drag—expanding this wonderful airplane's mission capability.



  • 5% to 14% or greater fuel savings:
    • 7.2% improvement due to drag reduction
    • 4.3% more savings for every 2000 feet of altitude gained
  • 2000 to 4000 feet higher initial cruise altitudes—reach high altitudes without losing Mach
  • .02+ increase in cruise Mach at equal power settings
  • 7% or greater increase in range
  • 1% decrease in N1 and 15º ITT reduction at equal Mach
  • Improved second-segment climb performance
  • Reduced time-to-climb
  • Quieter cabin due to less air separation noise
  • Turn some one-stops into nonstops
  • Minimal weight increase at 12 lbs
  • 30%-50% annual return on investment
  • Higher resale value
  • Broad industry appeal
  • Installation requires limited downtime: less than a week to install; painting of ZR LITE components can be done off-wing
  • The advanced ZR LITE flap components combine with the existing forward flap spar, and utilizes factory-installed flap tracks, supports, actuators and switches
  • The design eliminates any additional maintenance requirements over OEM's scheduled inspections
  • The ZR LITE 31 System is approved and fully compatible with RVSM requirements on the Learjet 31. The incorporation of ZR LITE does not require any changes to the existing RVSM system and no additional calibrations are required.


  • Raisbeck Engineering developed the state-of-the-art composite flap kits, which are designed to attach to the flaps' forward spar and surrounding skins and structures.
  • The trailing edge flaps are re-contoured and twisted from -6 degrees (trailing edge up) at the wing root, to + 2.5 degrees at their outboard extremities.
  • The re-contoured flaps are more aerodynamically aligned where they meet the aileron. This removes the drooped ailerons' former discontinuity. Reduced drag and increased aileron effectiveness are the positive result of this new design.
  • The original trailing edge flap mechanisms are retained, while the flaps themselves have been removed aft of the flap spar and replaced with ZR LITE composite aft segments. They are protected from lightning and under-surface foreign object damage through the use of advanced materials.
  • Extensive use of lightweight composites results in only 12 lbs net operating weight increase.