FAA AMT (Aviation Maintenance Technician) Airframe Practice Exam

During an unpressurized aircraft instrument static pressure system integrity check, the maximum altitude loss permitted is 100 feet in 1 minute. This limit is set to ensure that the static pressure system, which provides crucial information to various flight instruments, is sealed and functioning properly. Any loss beyond this limit could indicate a potential leak or failure in the system, which could result in inaccurate readings on instruments such as the altimeter. Therefore, conducting this test within the specified parameters is essential for maintaining the reliability and safety of the aircraft.

Option A is incorrect because it allows for too little altitude loss to detect potential issues with the system. Options C and D are incorrect as they exceed the maximum altitude loss permitted, which could indicate a more significant problem with the static pressure system.