Airspeed indicator, altimeter and vertical speed indicator all show incorrect indications at the same time. What error can be the cause?

Question

Question Quiz SPL - Sailplane Pilot License - Aircraft General Knowledge

QuizVDS · Accepted Answer

Blocking of static pressure lines.

QuizVDS · Answer

Leakage in compensation vessel.

QuizVDS · Answer

Blocking of pitot tube

QuizVDS · Answer

Failure of the electrical system.

Id 137 - SPL - Airspeed indicator, altimeter and vertical speed indicator all show incorrect indications at the same time. What error can be the cause?