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217 - ATPL - If the static source of an altimeter becomes blocked during a descent the instrument will:

Question 217 - Aircraft General Knowledge - Instrumentation - ATPL - Airline Transport Pilot license

Under-read
Gradually indicate zero
Indicate a height equivalent to the setting on the millibar subscale
Continue to display the reading at which the blockage occurred

Training tests and timed exam simulations ATPL - Airline Transport Pilot license