TAM A320 crash at Congonhas, Brazil

[James7]

AT Disconnect

@BOAC
Explanation : Airbus - From link posted earlier referring to TW Incident.

"The disconnection logic is such that ATHR disconnection is normally obtained
at touch down when both throttles are set to IDLE, without ATHR warning .
If not, another ATHR reset condition can allow the ATHR to be disengaged :
-If the THR TARGET feedback of one FADEC is different by 0.15 EPR from the
ATHR EPR TARGET limited to the corresponding EPR TLA, the ATHR is
disconnected after 1.8 sec. This condition triggers the ATHR warning. This
condition has been triggered before the previous one during that landing.
The FADEC transmission of the EPR TLA becomes NCD when the
corresponding throttle is selected in reverse range , the FMGC ARINC
acquisition behaviour (per design) in case of NCD is to keep the last EPR TLA
valid value (0.98 during lab test in the conditions of the TAN landing). On an
other hand the FADEC EPR TARGET FEEDBACK in reverse is reduced to
about 0.75 EPR. Such a difference is due to the fact that: when no alpha floor
condition is present, the FADEC EPR TARGET FEEDBACK is upper limited to
EPR TLA which is set, when TLA is at or below idle, to EPR IDLE. The EPR
IDLE is reduced by 0.2 when the thrust reverser has deployed more than 15%.
Consequently the EPR comparison becomes invalid and the ATHR is
disconnected after 1.8 sec with the corresponding warning .That involuntary
ATHR disconnection allowed the thrust to be frozen on engine2 whose lever
was at CLB notch !"

Thrust therefore would NOT reach climb power.

Max Tow
I think the 'Reverser no1 only' call would/could be a serious HF case if it was made prior to touchdown. Not true in this case and was made after 'sound of moving thrust lever'.

There is no sound of the 'Spoiler lever' being moved, so no spoilers no matter what could or could not be deployed. They would (if my understanding is correct) got some spoilers if they had move the SB lever. Not enough for sure but anything is better than nothing.

Tankering fuel in CGH on a marginal runway, is this wise? Especially when we.

Jim