L-1011 Autoflight: Vertical Speed Limits (22-23)

Maximum vertical speed climb command is 4,000 feet per minute and maximum descent command is 8,000 feet per minute.

If the existing climb or descent is in excess of the maximum vertical speed command values upon engagement, the flight director (if engaged) will command a return to the maximum command value. If the autopilot is in command, there will be an automatic, smooth return to the maximum command value. Either situation is highly unlikely to happen in normal operation.