Learn how Plane Support worked with JetCity to obtain EASA approved STC to upgrade the cockpit displays of Learjet 40 and 45 models.

The project

JetCity is an aircraft charter and engineering organisation. They offer complete corporate and private air charter solutions in Australia, South East Asia and the Pacific region.

Jet City decided to extend the life of the Learjet 40 and 45 aircraft by upgrading the cockpit display from the original Honeywell DU-870’s cathode ray tube to the LCD offered by the Honeywell Primus Elite DU-875. More info on the Jet City partnership with Honeywell can be found here.

To achieve this, Jet City required a supplemental type certificate (STC). This is a national aviation authority-approved major modification or repair to an existing type certified aircraft. As it adds to the existing type certificate, it is deemed “supplemental”.


Plane Support were engaged to work collaboratively with JetCity to create an STC package to certify the equipment on the Learjet 40 and 45 models. This was done in conjunction with an EASA 21J design organisation in the UK.

The eight-month-long project involved working closely with stakeholders in different time zones around the world with JetCity in Australia, and the design office based in the UK.

As a result, Plane Support in conjunction with JetCity were able to develop the engineering data pack. The certification plan included all of the maintenance bulletins, engineering data instructions, manufacturing instructions, compliance statements and flight manual supplements.

Plane Support not only used their design and engineering expertise to obtain the STC but also their manufacturing capabilities.

Plane Support manufactured the majority of components required for the first installation and has since been engaged to manufacture additional shipsets.

The work on this STC has led to follow on projects that Plane Support are excited to be involved in. The STC designed for the Primus Elite Upgrade package for the Learjet 40 and 45 has resulted in Plane Support working on a similar package of work tailored for the Citation 550 and 560 models.


JetCity now have an EASA approved STC to upgrade the cockpit displays. The upgrades bring the Learjet 40 and 45 avionics up to current specification, including the display of Jeppesen navigation charts.

Not only is the STC EASA approved but currently going through FAA validations. This is a significant international achievement for Plane Support to be approved with multiple countries.

Once FAA approval is achieved, Learjet 40 and 45 models around the world will be able to upgrade their systems.

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