Originally Posted by
bbofh
The Question and Copilot AI's answer is as shown below:
Do you agree with "copilot AI" (or not?) Give your reasoning.
Question:
What pitot-static system effects will be seen on the two Pilot's indicated airspeed instruments when the air data modules of a 777 aircraft's static systems are subjected to cryogenic ambient temperatures and low atmospheric pressures, resulting in a "stuck" value – during a descending level change from a very high altitude?
If that static pressure remains constant during the initial descent, will the airspeed tend to underread or overread?
Answer:
Assuming a normally functional pilot/copilot (and tertiary) pitot system, if all three static pressure ADM’s are in agreement and remain at a constant (frozen) value during a descent from high altitude, the airspeed indicator will typically tend to underread. This is because, in normal conditions, static pressure should increase as the aircraft descends to lower altitudes. If the (all three) ADMs' static pressure output remains constant instead of increasing, the pitot-static system will interpret this as the aircraft maintaining a higher altitude than it actually is. Consequently, the airspeed indicator will show a lower speed than the correct/actual indicated airspeed.
This scenario can occur if there is a blockage or malfunction in the static port, making it stick and preventing it from accurately sensing the increasing pressure during descent. It's crucial for pilots to recognize and address such issues to ensure safe flight operations.
Is there a specific scenario or issue you are considering?
Happy to retire in only a few years, before AI implementation in the flight decks.
