Thanks rrat - apart, then, from the obvious lack of flying ability of the crew and absent cockpit management skills, this system function may well be a major contributory cause of the accident.
Even that AD does not 'cut the mustard' for me - it refers primarily to A/P engagement and only a fleeting mention of the FDs.
"Further analyses have shown that, after such an event, if two airspeed
sources become similar while still erroneous, the flight guidance computers
will display the FD bars again, and enable the re-engagement of AP and
A/THR. However, in some cases, the AP orders may be inappropriate, such
as possible abrupt pitch command."
What about the FD 'orders'? Does the software mod direct the FMC to target
selected altitude rather than any other convenient number?
