20 minutes | Nov 10, 2019

TAP093: TOS & TOM

There are two new system developments discussed in this episode,   TOS (Take off surveillance) which comprises of TOS1 and TOS2, and,   TOM (Take off monitoring) which currently isn’t available on the A320 but is being evaluated for possible installation.   TOS1 checks flaps and trim settings and does a check of the performance parameters entered in the FMS (aircraft weight and takeoff speeds). This then compares actual performance settings with that entered in the FMS. TOS2 makes the same checks as TOS1, but additionally, checks that the aircraft is positioned on the intended runway and that the expected takeoff performance – based on data entered in the FMS by the crew,  is compatible with the runway distance available. If any of these checks compute an error, various ECAMs can be triggered.   TOM monitors the acceleration of the aircraft during the takeoff phase and warns you if a lower-than-expected acceleration is detected. From 30 kt, it compares the expected acceleration with the real acceleration of the aircraft. If the difference between the real aircraft acceleration and its expected acceleration is more than 15 % when the aircraft reaches 90 kt, TOM will trigger the red ECAM warning T.O ACCELERATION DEGRADED   Airbus recommends rejecting a takeoff if you get any of these uninhibited ECAMs on the takeoff roll.
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