- Stall sound source: from a Youtube video entitled "Stalling and spinning with a Cessna 152" by Morsule. License: CC-BY. Link: https://www.youtube.com/watch?v=zTq8Jvoks2U - Parking brake sound source: from a sound file entitled "Old Lever Pull" by DrMinky. License: kindly allowed it to be used under under the CC0 license. Link: http://freesound.org/people/DrMinky/sounds/167048/ - Trim wheel sound source: from a sound file entitled "rubber.wav" by datasoundsample. License: kindly allowed it to be used under under the CC0 license. Link: http://freesound.org/people/datasoundsample/sounds/41631/ - Damage sound source: from a sound file entitle "QUICK_SMASH_003.wav" by JoelAudio. License: CC-BY. Link: http://freesound.org/people/JoelAudio/sounds/135463/ - Gyro sound source: youtube video entitled "Starting C172N" by algefaen. License: CC-BY. Link: https://youtu.be/gg3q002qsyI - Repair sound source: from a sound file entitled "266626__producerdan__car-auto-mechanic-shop.wav" by producerdan. License: CC0. Link: https://freesound.org/people/producerdan/sounds/266626/download/ - Primer lever sound source: from a sound file entitled "262325__coltures__squeaky-car-door.wav" by coltures. License: CC0. Link: https://freesound.org/people/coltures/sounds/262325/ - Engine (regular, idle, start, cut off) sound source: from a sound file entitled "322321__jlwsound__small-plane-cessna-engine-start-idle-and-takeoff.wav" by JLWSound. License: CC0. Link: https://freesound.org/people/JLWSound/sounds/322321/