Should the pilot attempt to use the normal pitch trim system after pitch trim runaway?

• A. No
• B. Yes
• C. Only after autopilot re-engagement
• D. Only in manual mode

Answer: (A)

Pitch trim runaway is when the elevator trim moves rapidly and uncontrollably in one direction, driven by the trim system. In that situation using the normal pitch trim again is not advised because the trim servos can continue to respond to inputs, potentially worsening the runaway and making control extremely difficult or unsafe. The correct action is to isolate the trim system so the runaway stops—typically by using the pitch trim cutout switch and, if needed, disengaging any autopilot that might be commanding trim. With the trim isolated, you maintain control of the airplane manually and bring it to a stable attitude. Once the runaway has ceased and normal trim can be applied safely, you can re-enter trim carefully, but you do not continue using the normal trim system while the runaway condition persists.