Originally Posted by
NigelOnDraft
As others have said, under 60Klb of rocket thrust, the acceleration from M1 to M1.4 I doubt would be many seconds, and guess feathering equally catastrophic at either on the ascent phase?
Presumably, you want to verify you can unlock it before you go flying off into space, so you can cut the engine and abort the flight if you can't?
Though that may not make sense in this case, if it was just a short engine test.