che
Posts: 516
Joined: Wed Feb 09, 2000 10:02 am

Weight Distribution On A Saab 340

Mon Jul 09, 2001 1:35 pm

A few days ago I was on an AA Eagle Saab 340 from DFW-BTR (Baton Rouge,LA). When we all got on the flight the f/a made most of us move towards the back so the plane would be balanced. Also there were only about 15 pax on this fight. (july 4th).
Why would she do this? Is there really a need to balance th aircraft? I have never seen this done before.

Also one lady who was asked to move back
said she got airsick in the back so she wondered if she could switch seats with a man in the front. But then the f/a said that if she switched seats that would make the plane unbalanced. Weird

che
 
fr8tdog
Posts: 120
Joined: Wed Feb 16, 2000 4:25 pm

RE: Weight Distribution On A Saab 340

Mon Jul 09, 2001 2:31 pm

Yes this is common for regional Turboprop aircraft.

The Saab has a forward or neg CG when empty, This allows for balancing out the aircraft when the cargo is loaded aboard the aircraft.
Passengers must be moved aft if there is not enough weight in C1 or C2 compartment.
Now on the other hand if there is a lot of weight in the cargo section, we may have to shift passengers forward.
In the case of an aft CG, a jumpseater up front is very advantagous to the flight crew allowing for us to subtract "Index units" or Percent MAC if you perfer, allowing the CG to shift slightly forward.

This shifting of cargo or passengers is all acomplished via weight and balance sheets, that the pilots work prior to every flight.

In fact if we have a deadhead or empty leg, we must have 200lbs of ballast aboard in C2 or if an f/a is riding with, they must ride in one of the last row of seats on the aircraft.

Fr8tdog
Saab340 Capt.
 
ILOVEA340
Posts: 2064
Joined: Sat Oct 30, 1999 9:49 am

RE: Weight Distribution On A Saab 340

Mon Jul 09, 2001 3:19 pm

wow that complex!!!
 
cv640
Posts: 843
Joined: Wed Aug 30, 2000 8:10 pm

RE: Weight Distribution On A Saab 340

Mon Jul 09, 2001 11:24 pm

Yes, it can be at times. In one case with only 1 pax we were scrambling to find ballast one day. We were 20 minutes late once just trying to find weight to tthrow into the back.
 
che
Posts: 516
Joined: Wed Feb 09, 2000 10:02 am

RE: Weight Distribution On A Saab 340

Tue Jul 10, 2001 1:56 am

Wow that is complex. Thanks for all the replies. Fr8tdog ya answered my question and thanks for the great explination!
btw-I will post a trip report in about a week (CLE-DFW-BTR-DFW-CLE).

che
 
ILOVEA340
Posts: 2064
Joined: Sat Oct 30, 1999 9:49 am

RE: Weight Distribution On A Saab 340

Tue Jul 10, 2001 7:39 am

Hey One shyould invent instand S340 ballast. A few wieghts with handles left on the ramp for cases like this.
 
prebennorholm
Posts: 6409
Joined: Tue Mar 21, 2000 6:25 am

RE: Weight Distribution On A Saab 340

Tue Jul 10, 2001 7:42 am

It is that complicated at every flight.

The visual problem (for the pax) arises on flights with one class and free seating - typically short regional turboprop flights.

On larger planes you are mostly assigned a seat at check-in, and your seat allocation takes plane balance into account.

All domestic flights in Denmark are one class and free seating. On every other flight with roughly half load the pax are requested to move backward or forward for balance reasons. We are so used to it that we hardly notice. Some frequent fliers even ask the FA at boarding which end of the cabin is best today in order to avoid being moved around later.

Some pax are not very eager to move up front in the turboprops since they are so noisy up front, But hell, it is seldom much more than 30 minutes before you are back on the ground again.

Best regards, Preben Norholm
Always keep your number of landings equal to your number of take-offs
 
cv640
Posts: 843
Joined: Wed Aug 30, 2000 8:10 pm

RE: Weight Distribution On A Saab 340

Tue Jul 10, 2001 1:08 pm

Not all of our flights are short. We use to do MEM to HOU, that was 2 1/2 hours in a Saab. WE still go to TLH and TRI, both of which take 2 or more hours, so not all are little short hops.
 
prebennorholm
Posts: 6409
Joined: Tue Mar 21, 2000 6:25 am

RE: Weight Distribution On A Saab 340

Wed Jul 11, 2001 5:58 am

Oh yeah, CV640, but that's US domestic flights, not Danish domestic flights.

And since the USA is roughly fifty times greater than Denmark...  Big thumbs up

Rgds, Preben Norholm
Always keep your number of landings equal to your number of take-offs
 
che
Posts: 516
Joined: Wed Feb 09, 2000 10:02 am

RE: Weight Distribution On A Saab 340

Thu Jul 12, 2001 12:03 pm

A ballast system would'nt be a bad idea. Also this flight was a good 1.5hrs and the seating was assigned. Mabey a lot of no-shows.

btw-thanks for liking my topic

che

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