# Motor start at maximum speed while disarm, Quad takeoff and crash **URL:** \ **Category:** Uncategorized\ **Created:** [February 8, 2019, 2:20pm UTC](https://discuss.px4.io/t/motor-start-at-maximum-speed-while-disarm-quad-takeoff-and-crash/9537 "2019-02-08T14:20:37Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![AndreA](https://discuss.px4.io/user_avatar/discuss.px4.io/andrea/32/5977_2.png) [@AndreA](https://discuss.px4.io/u/AndreA)\ **Post date:** [February 8, 2019, 2:20pm UTC](https://discuss.px4.io/t/motor-start-at-maximum-speed-while-disarm-quad-takeoff-and-crash/9537/1 "2019-02-08T14:20:37Z")
the quad was on the floor, landed in stabilized mode, disarmed. RC was turned off after landing , we were recompiling some code on the companion computer and after 5min , suddenly the motors started and the quad crashed in the ceiling. it lasted 1 second. unfortunately i have no log, since it was not armed … our code is based on V1.6.5 is there any other log somewhere in the Pixhawk SDcard that can help to understand what happen ? ---
**Author:** ![AndreA](https://discuss.px4.io/user_avatar/discuss.px4.io/andrea/32/5977_2.png) [@AndreA](https://discuss.px4.io/u/AndreA)\ **Post date:** [February 8, 2019, 2:49pm UTC](https://discuss.px4.io/t/motor-start-at-maximum-speed-while-disarm-quad-takeoff-and-crash/9537/2 "2019-02-08T14:49:00Z")
software crash : I had the info while uploading the last ULG in Flightreview. it seems that the PX4 crash 13min after landing (4:30) the date is not set correctly it happen today (feb 8, 2019) * * * hardfault\_log] – 2018-10-18-04:43:21 Begin Fault Log – System fault Occurred on: 2018-10-18-04:43:21 Type:Hard Fault in file:semaphore/sem\_post.c at line: 118 running task: px4io FW git-hash: 06c55cc20b448b43ac37342e702387a99e5ed5f7 Build datetime: Oct 26 2018 17:15:44 Build url: localhost * * *