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Airspeed not indicated

Featured Replies

During a flight, no matter what aircraft, but mostly with the commercial jetliners that I fly, the airspeed needle drops to zero. The Shift +Z display on top of the screen also shows zero speed. Then a few minutes later, the speed is shown again, and this reoccurs. The only way I can see how fast I'm going is the ground speed shown on the GPS.

Why is this happening?

Eytan Ornstein

  • Administrators

Are you remembering to turn on the Pitot Tube heat?

Charlie Aron

AVSIM Board of Directors-ADMIN/Moderator-Registrar

Just going to run a Chromebook and not upgrade to a Windows computer. Too many problems with the new Sims! 😱
Trying to keep peace and harmony and the will of Landru on the site seems to be a full time job!

                          images (1) (1).jpeg

Sounds like ice in the pitot tube.  As Charliearon said, turn on the pitot tube heat.

My computer: ABS Gladiator Gaming PC featuring an Intel 10700F CPU, EVGA CLC-240 AIO cooler (dead fans replaced with Noctua fans), Asus Tuf Gaming B460M Plus motherboard, 16GB DDR4-3000 RAM, 1 TB NVMe SSD, EVGA RTX3070 FTW3 video card, dead EVGA 750 watt power supply replaced with Antec 900 watt PSU.

  • Author

So on which panel is the pitot tube heat switch located? Let's say the default A321.

Eytan

Look for the Probe/window heat button, center of the overhead electrical panel, just above the switches for the lights and APU.

My computer: ABS Gladiator Gaming PC featuring an Intel 10700F CPU, EVGA CLC-240 AIO cooler (dead fans replaced with Noctua fans), Asus Tuf Gaming B460M Plus motherboard, 16GB DDR4-3000 RAM, 1 TB NVMe SSD, EVGA RTX3070 FTW3 video card, dead EVGA 750 watt power supply replaced with Antec 900 watt PSU.

  • Administrators

pa321fd-v3-cfmzip-47-batterie-f640 (1).jpg

This may be a modified A321 panel, but it does show the probe heat switch.

Charlie Aron

AVSIM Board of Directors-ADMIN/Moderator-Registrar

Just going to run a Chromebook and not upgrade to a Windows computer. Too many problems with the new Sims! 😱
Trying to keep peace and harmony and the will of Landru on the site seems to be a full time job!

                          images (1) (1).jpeg

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