What is the maximum allowable difference between Captain and First Officer altimeters?

The maximum allowable difference between the Captain and First Officer altimeters is 200 feet. This limitation is in place to ensure the accuracy of altitude readings, which are crucial for safe aircraft operation, especially during critical phases like takeoff and landing.

When flying, it is vital that both pilots have consistent and reliable altitude information, as discrepancies could lead to misunderstandings in altitude management and could potentially result in controlled flight into terrain or other hazardous situations. The specified limit of 200 feet allows for a reasonable margin of error while still maintaining safety protocols. If the difference exceeds this limit, it typically requires corrective action, such as recalibrating the altimeters or investigating the source of the discrepancy.

Understanding this limit is essential for pilots to adhere to proper operational standards and to ensure effective communication and coordination in the cockpit.