# Commander land won't land drone in jmavsim **URL:** \ **Category:** PX4 Autopilot\ **Created:** [August 21, 2020, 3:00pm UTC](https://discuss.px4.io/t/commander-land-wont-land-drone-in-jmavsim/18233 "2020-08-21T15:00:57Z")\ **Posts on this page:** 1\ **Showing post:** 2
**Author:** ![querist](https://discuss.px4.io/letter_avatar_proxy/v4/letter/q/6bbea6/32.png) [@querist](https://discuss.px4.io/u/querist)\ **Post date:** [August 21, 2020, 3:08pm UTC](https://discuss.px4.io/t/commander-land-wont-land-drone-in-jmavsim/18233/2 "2020-08-21T15:08:53Z")
OK - never mind… I found the answer in a strange place… > [@Need help with jMAVsim - always climbing and can't start mission \[SOLVED\]](https://discuss.px4.io/t/need-help-with-jmavsim-always-climbing-and-cant-start-mission-solved/698): > > Hi, I have been trying to set up a hardware in the loop (HIL) simulation for multi-copters using jMavsim. Here is a summary of my problem: Simulated vehicle starts climbing immediately after arming 0 throttle (stick at the bottom) correspond to 1000 PWM for each motor, but vehicle is still climbing Pixhawk connected to Ubuntu terminal via a usb cable, only things attached to pixhawk are safety swtich, buzzer and RC receiver, I use a RC transmitter to give manual control input When sw… I would have thought that a bug from a couple of years ago would have been fixed in the source, but apparently it wasn’t fixed in the sim code. Thanks. --- _[View the full topic](https://discuss.px4.io/t/commander-land-wont-land-drone-in-jmavsim/18233)._