X-Plane’s most popular ever freeware has been updated once again, this time bringing the Zibo Mod 737 up to version 3.37, just over a month since it’s last substantial update.
The main drawcards of the latest update include a brand new electrical system, added custom failures and a custom refuelling system, amongst many other changes contributing to the 35-line changelog.

Version 3.37 brings a mixture of different improvements to almost all aspects of the aircraft, from LOC capability to repainted airstairs.
The full changelog is available below:
- add airstairs textures for AXP liveries (thanks to @enjxp)
- add command Airstairs toggle
- add toggle commands for lights
- add support librain plugin (by Skiselkov) in VR (thanks to @Ekre)
- add option for Ground power cabel connection – AUTO/BEACON (trigger)
- add option for white bug on PFD (V2+15 or V2+20)
- add opton Fix all failures on EFB (with detection custom failures)
- add option FMC input lag (default OFF)
- add option for XHSI (default OFF)
- add option hard/smart/off for RA callouts (500ft, 1000ft, 2500ft)
- add SKI effect to cabin windows
- add option AUTO for passengers
- gently tuned AP, AT
- corrected graphics (EICAS, PFD rolling speed and alt tape, TCAS rings, heading rose on PFD, runway on PFD, …)
- corrected ND during align
- add Cancel/Recall button on MFD
- corrected systems (electric, hydraulic, bank angle selector…)
- modeled LOC by RL pilot experience
- add LOC/GLS disagree on PFD (frequency/course)
- add automatic connect ground power cable after arrival to gate
- add crossbleed start engine annunciate on EICAS/ENG
- add manipulators for electric trim on yokes
- add touchdown effect (not working in replay yet for Xplane 11.36 – working in Xplane 11.40)
- tuned Autoland for new AP pitch servo code and new ROLLOUT code
- add flaps vibration on the ground
- fixed decode/populate STAR waypoints (with STAR and Destination Runway selected only)
- fixed pressurization display
- fixed FD TO/GA
- add pages to FMC (some pages have static datas yet)
- new electric system (modeled all basic buses, TR Units, Relays / all devices, systems,…)
- add failures system (electric/hydraulic/systems… see EFB main menu)
- add refuel system (see EFB ground services menu)
- add Fueltruck and icons for Fueltruck, Failures… (thanks to @JBRIK)
- read apt data from folder “Custom Scenery” too
- fixed bugs
The update is available from the Zibo Mod drive, which you can access here.
Cheers to Recoil for the tip off in the Threshold Discord server!
