July 22, 20196 yr EDIT: wrong analysis from me. Hello Dave 😃 Pilot2ATC v2.6.0.0.0 - r3 X-Plane v11.34 - r1 Aircraft used: RWDesign Citation Mustang (with the standard G1000 from Laminar) - On the MFD of the G1000, my ground speed (GS) is 315 Kt - On the PFD of the G1000, I read a 25 kt headwind component=> so my true air speed (TAS) is 315 - 25 = 290 kt => my true air speed (TAS) is 315 + 25 = 340 kt ----- Pilot2ATC indicates a wrong true airspeed (TAS) of 340 kt (315 kt + 25 kt) There may be an inversion in the calculation of the true air speed: - With headwind: TAS = ground speed - axis component wind - With downwind: TAS = ground speed + axis component wind Can you check that in P2A ? Edited July 22, 20196 yr by JPR *** Jean-Pierre *** (french user) X-Plane v12.1.1 - Windows 10 Pro // Laptop MSI GS75 Stealth dual screens ; RAM : 32 Go DDR4 @ 3200 MHz ; CPU: I9-10980HK @ 5.3 GHz ; GPU: Nvidia Geforce RTX 2080 Super - VRAM 8 Go  ; 1 disk SSD : 2 To // Thrustmaster HOTAS Warthog + Saitek Throttle Quadrant + rudder pedals MFG Crosswing // TrackIR_5
July 22, 20196 yr Commercial Member To have a GS of 315 kts with a 25 kt headwind, your TAS would have to be 340 (315 + 25). Your formula is reversed. Dave
July 22, 20196 yr Author Ooops, you are right, the mistake is... me 🙄 *** Jean-Pierre *** (french user) X-Plane v12.1.1 - Windows 10 Pro // Laptop MSI GS75 Stealth dual screens ; RAM : 32 Go DDR4 @ 3200 MHz ; CPU: I9-10980HK @ 5.3 GHz ; GPU: Nvidia Geforce RTX 2080 Super - VRAM 8 Go  ; 1 disk SSD : 2 To // Thrustmaster HOTAS Warthog + Saitek Throttle Quadrant + rudder pedals MFG Crosswing // TrackIR_5
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