Which of the following is NOT true concerning the ground adjustable trim tabs?

• A. Tabs can be used as a backup trim system in flight
• B. Tabs are located on each aileron
• C. Tabs adjusted by maintenance personnel
• D. Tabs adjust for stick neutral trim input to controls

Answer: (D)

Ground adjustable trim tabs are fixed on the trailing edge of the control surfaces and are set on the ground by maintenance personnel to establish a predefined trimming condition. They are not adjusted during flight by the pilot, and their purpose isn’t to respond to or compensate for the pilot’s stick position in flight. In other words, they provide a baseline trim that is determined on the ground, not by in-flight stick input. That’s why the statement about tabs adjusting for stick neutral trim input to the controls isn’t correct.