Discussion
A flight test engineer wants to excite the short-period mode cleanly. The appropriate input is
Answer: D
A short, sharp doublet on the column, returned to trim, puts energy into the fast mode and leaves the slow one almost untouched, which is exactly what is wanted for a clean record. A slow throttle change is the standard way to excite the phugoid, because it perturbs speed rather than incidence. A steady pull establishes a new trimmed load factor and measures manoeuvre stability, not the transient. A rudder pulse excites the lateral modes, chiefly Dutch roll, and would only confuse a longitudinal record.
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