In aircraft if pitot line got blocked what will be the altimeter reading?

Answer 1

Altitude is calculated on the basis of static air pressure and airspeeds are calculated on the difference between the static air pressure and pitot air pressure, therefore if the pitot tube were block the only instrument which would be affected would be the airspeed indicator. Static pressure ports are usually located on the skin of the aircraft where they are flush and cannot be affected by wind speed. ADDITIONAL INFO Static preasure is measured from the static port, usually located on the side of the aircraft. If the static port is blocked it usually freezes the altimeter at the last reading when the port was blocked. Many aircraft have a valve to switch to cabin preasure if the static port is blocked. Also you can break the glass of some altimeters so it will then use the cabin preasure to tell altitude. But beware that when you break the glass your vertical speed will read opposite, so it will say you are going up when you are going down etc. You can tell when the static port is blocked when the altitude reading doesn't change when the aircraft changes altitude.