Lockheed C-5 Galaxy Operations Limits Practice Test 2026 - Free Practice Questions and Study Guide

When the CG is aft of 30%, the airplane tends to pitch up, and the elevator’s ability to trim the nose down is reduced. That means there’s a smaller speed range where you can achieve the necessary nose-down trim to hold level flight. The nose-down trim limit speed is the highest speed at which you can still trim nose-down within the available control travel. For CG aft of 30%, that limit is 300 knots, so 300 knots is the correct value. Speeds above that (310, 320) would require more nose-down trim than the elevator can provide, and speeds below (like 290) are within the allowed range but not the limit.