The min takeoff weights on the b737-700igw for different engine de-rates (the heavier you are the more engine power you're allowed) relate to amount of rudder force available during a takeoff with an engine failure. The short body and the big engines mean that you're at risk of losing directional control both on the ground and in flight if you exceed the allowed de-rate. So don't push that thrust levers past the green caret unless you're above your flap maneuver speed.

Some limit regarding min wt for Autoland would dictate a min to wt if one intends to do auto land etc....

Very light sectors on the EMB-145 required ballast in the aft cargo area, especially if the catering trolleys were not loaded

Vmca and Vmcg accepted..

our B737-700 IGW airplanes are restricted with 88,900 lbs (40,325 kgs) limitation on Minimum Flight Weight...

mainly for the pitch attitude required to maintain V2 ++, and the comfort factor with such an unusually high attitude.

Cheers...FD...:ooh:

On many of the Citation models, flying Single pilot under the exemption, something not really anticipated by the designers...was an extreme aft CG, sometimes out of limits...some charts in the nose (20lbs) can get it back in...but it was anticipated that two 175lb + pilots were up front as minimum required crew, vs one 200 lb guy.....anther ballast type of thing....R22 helo needs balast if the pilot weighs to little, mainly to give the helo more required weight for a good autorotation....

was an extreme aft CG, sometimes out of limits

not the OEM's problem .. the AFM specifies the limits .. the pilot is required to make sure that they are observed. If this requires ballasting so be it.

B77W Min TOW?
 

Hey guys, my first ever post on PPRuNe. :)I've heard from a source that the B77W (777-300ER), has a minimum takeoff weight! Is this true? This is for safety reasons, apparently. If one eng were to cut-out during rotation, the yaw-rate induced would be quite severe. Hence the requirement. This is what I've heard. Would be great if any of you could shed some light into this.

Thanks,
Cheers!

The 777 minimum take-off weight is mainly an issue for the 77F (freighter).

This is simply because the freighter has a much lower Dry Operating Weight than it's equivalent passenger model (200LR).

Combine a low DOW with those extremely powerful 110 k engines (which have been shown to be capable of 127 k :eek:) and you have a situation where Vmca can be exceeded in the event of an engine seizure - obviously not an option!

Therefore you must either load fuel or ballast to bring the aircraft up to it's minimum TOW.

Here at EK I think we have a minimum TOW of about 170 tons versus a max TOW of about 350t. Would check the books but I'm supposed to be doing the washing-up while the wife's out. :suspect:

Haha! Thank you for your input, really appreciated.:)

Mr 777

Welcome aboard! And THANKS for using the search to resurrect this old thread on a subject you were inquiring about. :D

GF

Minimum flight weight
 

Been there, done that...:
http://www.pprune.org/tech-log/36113...eight-why.html

The A330 I fly has a minimum weight of 125000 KG not only for take off but also for all flight phases. If the ZFW is less than that, any fuel between those weights is basically unusable. Airbus don't say why...

For my 737 I found a " minimum flight weight",38555kg, u can faund it in mass & balance manual..:ok: