Prior to descent below 500 agl: "Engines Spooled-Up" ???
Simfly mentioned just above: "... the engines did not "cut out" ... but maybe stayed at the same power setting despite the movements of the power levers..."
That suggests the the B-47 mishaps of the 1950's (that led to the in-flight drag-chute for that clean airplane).
The UA B727 /11nov65 at SLC was the civil exemplar case, led to the published Engine Acceleration Curves in the Boeing _Airliner_ of Jan/Feb '66.
I can also recall one case during Flight Test of the early B767 (some with the early EEC faults), on ground prior to T/O, where pilot advanced the thrust levers, but the engines wouldn't spool-up off Idle RPM [at that point pilots had learnt to cycle the EEC Alternate Action Switch to awaken the FBY Throttles].