Min menu

Pages

News

Ice Ridges Phenomenon

 Ice Ridges Phenomenon

  • probes, which can create airflow perturbations & causes airspeed computed value to be lower than the actual airspeed.
  • The primary cause of ice ridges over the lower nose fuselage area is ice accretion during a long stay on the ground in we can define the phenomenon as, the build-up of ice ridges on the lower nose fuselage in front of the Pitot old conditions aided by Nil or partial ground De-icing act.
  • A secondary reason can be, when snow falling on a heated windshield melts & the water running down from the windshield refreezes in ridges on the lower fuselage.
  • Not a well-known condition to the Flight & maintenance crew, the consequences of ice ridges located forward of the Pitot probes on the lower nose fuselage prompt airflow perturbations forward of the probes.
  • Eventually, this can lead to the airspeed data coming from the ADR (or ADC) associated with the affected probe(s), to be at a value that is significantly lower than the actual airspeed, affecting the aircraft systems.
  • Attention to the potential presence of ice ridges in cold weather conditions, especially for the first flight of the day or after an extended stay on the ground is sought.

reactions :