PIA in the (well-sort-of) grass
Thread Starter
Join Date: Dec 2006
Location: KUL
Posts: 431
Likes: 0
Received 0 Likes
on
0 Posts
PIA in the (well-sort-of) grass
Incident: PIA A313 at Karachi on Jun 16th 2013, runway excursion on takeoff
Perhaps a couple of hours refresher on a Cessna 310 are in order?
Perhaps a couple of hours refresher on a Cessna 310 are in order?
Join Date: Jun 2001
Location: Surrounded by aluminum, and the great outdoors
Posts: 3,780
Likes: 0
Received 0 Likes
on
0 Posts
every engine/aircraft combo has an rpm threshold above which eng spool-up must be within specific parameters, and symmetrical...if they dont match, don't release the brakes...most generally it's around 50%N1, but for sure varies from type to type...
Join Date: Jan 2011
Location: London, UK
Posts: 143
Likes: 0
Received 0 Likes
on
0 Posts
Thanks. I'm not a pilot (as if you hadn't guessed!) but my stepdad was, for BEA, and he was telling me how many years ago he was taking off at night from somewhere in Scandinavia where the runway jutted out into the sea and it turned out not to have been de-iced properly.
He found this out the hard way when the 2 engines on 1 side spooled up faster than the other and they could neither brake or steer thanks to the ice so ended up veering towards the sea JUST before building up enough speed for the rudder to start working and get them back on the centre line!
He found this out the hard way when the 2 engines on 1 side spooled up faster than the other and they could neither brake or steer thanks to the ice so ended up veering towards the sea JUST before building up enough speed for the rudder to start working and get them back on the centre line!
Join Date: Dec 2012
Location: Scandiland
Age: 66
Posts: 16
Likes: 0
Received 0 Likes
on
0 Posts
every engine/aircraft combo has an rpm threshold above which eng spool-up must be within specific parameters, and symmetrical...if they dont match, don't release the brakes...most generally it's around 50%N1, but for sure varies from type to type...
Since we rarely spool up while holding the brakes (rolling take-offs), it's a bit late to not release the brakes if they don't match up. That's why there's a spool-up and pause prior to application of TO thrust.
