Annex14's
assembly of engine parameters is interesting. I am put off by the 'zeroes'. I think neither N1 nor N2 siezed, so is the reading of '0' RPM a hard number, or one generated by the EEC after loss of the actual signals from the engine? N1 and N2 are sensed at the respective Shaft via phonic wheel. Four each, two pair, each pair sending its output to either channel A or channel B of the EEC. N3 is derived from the generator affixed to the gearbox connected via driveshaft to the Ring gear on the HPC Shaft. If the shaft speeds are disabled, the EEC computes "generalized" numbers to send to the cockpit for display. So I am reluctant to assign events to the 'timeline' from the list.