Learjet 40/45 Display Unit Replacement | JetCity Engineering
Utilising existing aircraft Primus 1000 core components, failed DU-870 CRT display units can now be replaced using the JetCity Engineering DU-875 LCD drop-in replacement STC without the requirement of aircraft modification.
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LearJet 40/45 Display Unit Replacement

LearJet 40/45 Display Unit Replacement

Utilising existing aircraft Primus 1000 core components, failed DU-870 CRT display units can now be replaced using the JetCity Engineering DU-875 LCD drop-in replacement STC without the requirement of aircraft modification. The drop-in replacement can be carried out in the following configurations:


  • Primary Flight Display
  • Primary Flight Display and EICAS Display
  • All Display Units


System advantages of the new drop-in DU-875 LCD units

  • 2 X Display System Reliability
  • Minimal downtime for display replacement (field replaceable)
  • Increased display readability and clarity when compared to CRT displays
  • 7.7LBS weight saving per display unit replaced
  • Legacy display formats retained removing the requirement for additional pilot training
  • HAPP (Honeywell Avionics Protection Program) savings on 4 screen replacement
  • Enhanced functionality growth path for Primus Elite‚ Jeppesen Charts, Maps, XM Weather overlays (enhanced functionality STC expected H1 2018).


News update: JetCity Engineering have commenced the final testing of the Primus Elite enhanced features, including carrying out the XM Weather Display Overlay integration tests. 


One STC, all options

All customers purchasing the JetCity Engineering Pty Ltd Learjet 40/45 DU-875 drop-in replacement STC prior to the Primus Elite™‚ enhanced functionality STC release, will automatically receive the enhanced functionality STC upgrade documentation and aircraft approval uplift once regulatory approval has been received at no additional cost*


Register your interest

With the Primus Elite™ enhanced feature STC release expected during H1 2018, JetCity Engineering is currently taking registrations of interest for enhanced feature installation kits. Due to the extended lead and manufacture time, please register your interest to purchase the kit when certification is achieved.



Kit contents

  • Customised Learjet Cursor Control Device
  • DU-875 enhanced rack expansion connectors
  • Installation wiring (pre-cut to length non terminated)
  • Miscellaneous connectors and installation hardware


* No additional charge applies to aircraft where no alterations to STC documentation package are required to account for aircraft specific aircraft modifications beyond normal aircraft equipment configurations.

Frequently asked questions


Why should I replace the existing display units on my aircraft?

The DU-870 cathode ray tube display units are no longer supported by the only authorized repairer Honeywell with repairs of failed units being ceased at the end of 2016. With the support and repair discontinued, the DU-870 exchange unit availability will decrease significantly as the exchange pool of units is used and not replenished. This will ultimately increase the possibility of having an AOG situation involving a display unit with no DU-870 availability.


Are there any wiring changes required for the drop-in DU-875 Display Unit replacement?

There are no wiring or aircraft modification changes required for the drop-in DU-875 replacement, the original display is simply removed and replaced with the new LCD display unit and can be done simply in the field if required.


I have purchased the EASA/FAA drop-in STC to replace a failed display unit prior to the release of the enhanced feature STC, do I need to purchase the enhanced feature STC also?

No, When you purchase the JetCity Engineering EASA/FAA Drop-In STC you will automatically have your aircraft added to the enhanced feature STC permission list and have the required installation documentation forwarded to you following STC approval.


I have purchased a drop-in DU-875 screen to replace one of my failed DU-870’s. Can I still use this screen for the enhanced upgrade when I choose to complete the upgrade?

Yes, the DU-875 drop-in display unit (P/N K9321060A14) can be upgraded by an ‘on the wing’ software upgrade to DU-875AF P/N K9321062A11 that will allow installation as part of the enhanced feature upgrade.


Are there any special promotions available for display unit purchase?

Honeywell are currently offering a trade-in credit of USD$40,000 for each DU-870 that has been guaranteed through to the end of 2018 when a DU-875 is purchased as a replacement unit for a Learjet 45. As the EASA/FAA STC holder, JetCity Engineering are offering special package pricing. For information contact Mr. Travis Stephens


Are there any other incentives to installing the new display units?

Honeywell are offering the following additional HAPP incentives.


Honeywell Avionics Protection Plan (HAPP) Incentive for customers that upgrade just their CRT displays to LCD’s:


  • New HAPP customers will receive $2500 off first year contract price for each display upgraded
  • Existing HAPP customers will be able to convert to a new hourly contract to extend upgrade coverage


Honeywell Avionics Protection Plan (HAPP) incentive for customers that upgrade to Primus Elite: New multi-year agreement with fixed 3% escalation:


  • First year FREE HAPP coverage
  • Second and Third year $10,000 off regular contract price
  • Fourth year and beyond, will be calculated using regular contract pricing but the new higher reliability LCD DUs will continue to provide a price incentive over the same contract calculated using the older CRT’s


What additional features are gained once the enhanced feature upgrade is completed?

  • Enhanced Map displaying Geopolitical Boundaries, Aircraft Heading (North or HDG Up), FMS Flight Plan, Airports, Navaids, Airways, Airspace, Aircraft Position
  • Jeppesen Charts
  • XM Weather overlay on enhanced map (if optional XM weather installed)


What is required to complete the full Primus Elite™ enhanced feature upgrade when it is released?

The full enhanced feature set upgrade requires significant wiring additions as well as additional components to complete the installation. Required components:


  • 4 x DU-875AF Liquid Crystal Display Units
  • Learjet 40/45 Primus Elite™ software package
  • Display Unit enhanced mounting trays
  • Learjet 40/45 Custom Cursor Control Device
  • DL-1000 Data Loader
  • Learjet 40/45 Enhanced Functionality Installation Kit
  • XM Weather Receiver (If optional XM Weather installed)
  • XM/GPS Antenna (If optional XM Weather installed)


What is the aircraft down time for the Primus Elite™ enhanced feature installation?

Estimated downtime for the enhanced feature installation is 5 to 10 business days.


When is the enhanced feature STC upgrade approval expected?

With the validation installation now completed on the development aircraft, the Primus Elite™ enhanced feature STC is expected H1 2018.


Who can carry out the Primus Elite™ installation and upgrade?

As the worldwide STC holder, JetCity Engineering are able to provide advantageous pricing on display unit purchases and STC packaging and can provide installation components and assistance to your own maintenance facility should you wish to complete the upgrade ‘in house’.


For European based aircraft please contact travis@jetcity.com.au and we will put you in contact with our regional distribution and installation partners directly for pricing and installation information.


For any STC enquiries or special package pricing please contact travis@jetcity.com.au

For all enquires relating to the Learjet 40/45 Display Unit Replacement STC or Honeywell Primus Elite‚ upgrade path or to discuss our Display Unit and STC price packaging please contact:


Mr Travis Stephens
Avionics Manager
JetCity Engineering
T +61 3 9330 1555


Display packaging offered:
Single Display Unit (including STC)
Dual Display Unit package (including STC)
Four Display package (including STC)