Originally Posted by
double_barrel
What am I missing here? These guys called V1 and V2 on the take-off run. Similarly with the infamous Brisbane take-off with pitot covers on.
How is this possible? Can the tape or covers on the pitots stretch enough to compress the air in the pitot to give accurate and consistent speed readings at ground level? That seems very unlikely.
Firstly with Aeroperu 603, it was the
static ports that were covered, so the IAS will indicate correctly at the altitude the static ports were covered. During the take-off roll everything appeared and indicated normally, so V1 & V2 calls were OK. Different story once they climbed away from the altitude at which the static ports were blocked.
With MAS in Brisbane with the
pitot tubes covered, both pilots observed red flags on their IAS displays. So how could they call V1 &V2? The interim ATSB report gives a clue: When the Captain called the 100 knot IAS check, the
groundspeed was 100kts.