Which steps are used to verify altimeter accuracy and altitude readings?

Which steps are used to verify altimeter accuracy and altitude readings?

• A. Set the correct altimeter setting
• B. Cross-check with other altitude references
• C. Perform instrument checks if available
• D. All of the above

Answer: (D)

Understanding how to verify altimeter accuracy starts with getting the instrument configured correctly. Set the altimeter to the local pressure setting for your position (the current QNH). This ensures that the reading corresponds to the actual altitude above mean sea level. If the setting is off, your indicated altitude can be higher or lower than reality, which could lead to unsafe clearances from terrain or obstacles. Next, cross-check the reading with other altitude references you have. If GPS altitude is available, compare it with what the altimeter shows. Use known altitude references such as the field elevation or published altitude constraints along your route to see if the indicated altitude is consistent. This cross-check helps catch discrepancies between settings, sensor errors, or instrument faults. Finally, perform instrument checks if available. This involves verifying the pitot-static system and the altimeter itself for proper operation—checking for leaks, blockages, or calibration issues, and ensuring the instrument responds correctly to pressure changes. Running these checks helps confirm the system is functioning and that the readings you rely on are trustworthy. Using all these steps together provides confidence that your altimeter readings reflect reality, supporting safe decision-making and obstacle clearance.

Understanding how to verify altimeter accuracy starts with getting the instrument configured correctly. Set the altimeter to the local pressure setting for your position (the current QNH). This ensures that the reading corresponds to the actual altitude above mean sea level. If the setting is off, your indicated altitude can be higher or lower than reality, which could lead to unsafe clearances from terrain or obstacles.

Next, cross-check the reading with other altitude references you have. If GPS altitude is available, compare it with what the altimeter shows. Use known altitude references such as the field elevation or published altitude constraints along your route to see if the indicated altitude is consistent. This cross-check helps catch discrepancies between settings, sensor errors, or instrument faults.

Finally, perform instrument checks if available. This involves verifying the pitot-static system and the altimeter itself for proper operation—checking for leaks, blockages, or calibration issues, and ensuring the instrument responds correctly to pressure changes. Running these checks helps confirm the system is functioning and that the readings you rely on are trustworthy.

Using all these steps together provides confidence that your altimeter readings reflect reality, supporting safe decision-making and obstacle clearance.