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      02-14-2009, 03:53 AM   #44
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Originally Posted by 777ER View Post
There's no de-icing switch on the 732. It's anti-ice.

There's more to the story than just inexperience and the hold...

The aircraft was deiced by the airport workers while it was at the gate waiting for the weather to clear up a lil.

then the tug had problems getting enough traction in the snow to pushback the 732...
the captain then elected to use the thrust reversers to assist in the pushback to reduce the departure delay...

it did work...but the thrust reversers did kick up snow and slush from the ground onto the top of the wing...and some of that ended up going into the intake of the engine

the pitot tube in the intake of the engines got snow/slush into it and it gave a false high reading (smaller diameter now, high velocity flow)...

so the crew sets the EPR (Engine Pressure Ratio, it's a power setting used on the P&W engines) for takeoff...down the runway it goes.....aircraft stalls (airspeed & angle of attack) and down it went into the river.

Right before the airspeed stalled (during climbout phase) the crew noticed the aircraft wasn't gaining enough speed as it should and added more power which was too late in this case (aircraft stalled already).
They did notice it took a long time to gain speed during the takeoff run...

The findings? Engine power was set too low due to false EPR reading.
Thanks for clearing up the details...I've only watched "Seconds from Disaster from National Geographic" a while ago....forgot the part where the crew used reverse thrust to clear some snow and got some stuck in pitot tube or so....

Aircrash Investigation and Seconds from Disaster are some on my favorate shows....its just sad that some little careless-ness and distraction lead to disaster....