RyDawg82
Posts: 833
Joined: Fri Sep 14, 2001 8:30 am

757 Fuel Jettison Equipment

Mon Jun 23, 2003 3:59 pm

Hello...

I stumbled upon this photo
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Photo © John Muzic



-- I happend to notice what looks like a fuel jettison valve located between the outboard and inboard flaps. I was reading this post http://www.airliners.net/discussions/tech_ops/read.main/52188/ where it implies the 757 doesn't have such a feature.

I have looked at other Northwest 757-200/300 A/C
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Photo © Peter Kesternich


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Photo © Doug Owens

As you can see, these don't have it, and I cannot locate any other airlines with it.
Can someone please explain what I am seeing? There are no other previous owners to this bird, at least that I can locate...Thanks for the help....Ryan
You can take the pup out of Alaska, but you can't take the Alaska out of the pup.
 
Rick767
Posts: 2613
Joined: Sun Jan 30, 2000 8:11 pm

RE: 757 Fuel Jettison Equipment

Mon Jun 23, 2003 4:44 pm

None of our 757s have a fuel dump facility, but I understand it is an option on the heavier models?
I used to love the smell of Jet-A in the morning...
 
RyDawg82
Posts: 833
Joined: Fri Sep 14, 2001 8:30 am

RE: 757 Fuel Jettison Equipment

Mon Jun 23, 2003 10:29 pm

Rick I assume you are talking about NWA? If so, Im just trying to understand what I am seeing in that picture...Ryan
You can take the pup out of Alaska, but you can't take the Alaska out of the pup.
 
Guest

RE: 757 Fuel Jettison Equipment

Tue Jun 24, 2003 12:08 am

Dear Rydawg82...
xxx
Remember this word: options... options... options...
Boeing makes airplanes and offers options to airline customers...
I never say "never has" or "always will be with" when talking of an airplane...
I never say "you are wrong"... maybe Mr. Boeing really did, or... did not...
xxx
Rick is our resident expert 757-767 here in Tech.Ops... I can only mumble about 747 whales... and will mention a few things about "fuel dump"... let me use pounds since you are from USA, some people there dont like kee-lohs...
xxx
In my 747, we have a jettison system (fuel dump) which as you know is a quick way to reduce aircraft weight in case of emergency. If you care to inform yourself about regulatory aspects of the jettison system, read FAR 25 or JAR 25 about fuel tanks and weights...
xxx
The 747 I fly has a maximum takeoff weight of 833,000 lbs, and maximum landing weight of 630,000 lbs. In case maintenance informs me that the jettison system is inoperative, I consult my MEL to read that I can takeoff, but only 6,000 lbs heavier than maximum landing weight = 636,000 lbs... Yet, what is interesting to note, if I takeoff at 833,000 lbs, and have a dire emergency requiring me to return and land immediately, probably at about 827,000 lbs or so, the aircraft can do it perfectly well, hoping the runway is long enough, because the speed will be high... All airplanes are flown by test pilots when they are first certificated, to be able to land at their maximum takeoff weight, no matter what.
xxx
I have landed a couple of times over maximum landing weight with airplanes, all they do is a "heavy landing inspection"... did not seem to be that much in it, since it was done in one hour, and signed off... maybe our MX experts will tell us about that in more technical terms...
xxx
Rick tells you that his 757 dont have jettison system, maybe some which are heavier (weight options by Mr. Boeing) require the installation of a dump system...
xxx
Happy contrails  Smile
(s) Skipper
 
AAR90
Posts: 3140
Joined: Fri Jan 21, 2000 11:51 am

RE: 757 Fuel Jettison Equipment

Tue Jun 24, 2003 1:34 am

Early models of the 757 were not certified with a fuel dump system as there was no requirement for one. Later models provided an increased MGTOW and the FAA placed a fuel dump requirement for those models. Boeing modified the production line and this is now a customer option on all models of 757s.
*NO CARRIER* -- A Naval Aviator's worst nightmare!
 
A/c train
Posts: 674
Joined: Sun Jun 10, 2001 7:57 am

RE: 757 Fuel Jettison Equipment

Tue Jun 24, 2003 2:11 am

Rick 767, our resident 75 expert, excellent  Wink/being sarcastic.

What airline do you fly for rick ? its either BY or Air2K. Hopefully the latter.

regards a/c.
 
m717
Posts: 540
Joined: Tue Dec 31, 2002 1:01 pm

RE: 757 Fuel Jettison Equipment

Tue Jun 24, 2003 4:57 am

No 757 that I have operated (for 2 different airlines) had fuel jettison capability, so evidently these were earlier models.
 
Rick767
Posts: 2613
Joined: Sun Jan 30, 2000 8:11 pm

RE: 757 Fuel Jettison Equipment

Tue Jun 24, 2003 6:43 am

"What airline do you fly for rick ? its either BY or Air2K. Hopefully the latter."

Yep don't worry it is BY... but.... that's not what you said is it  Crying
I used to love the smell of Jet-A in the morning...
 
Yikes!
Posts: 284
Joined: Sat Oct 13, 2001 4:51 pm

RE: 757 Fuel Jettison Equipment

Tue Jun 24, 2003 6:58 am

The picture you've shown is not a fuel jettison pipe but a piece of rubber/neoprene insulation that's worked its way loose from inside the flap mechanism.

Fuel jettison is not a normal option on the 757-200 as it is quite capable of landing safely at its full gross weight of nearly 114,000 kg with nothing but an overweight inspection to follow.

Best Regards
 
Rick767
Posts: 2613
Joined: Sun Jan 30, 2000 8:11 pm

RE: 757 Fuel Jettison Equipment

Tue Jun 24, 2003 7:06 am

Actually I think Yikes! has got it here, on closer inspection that is probably exactly what it is. In any event if such a system was installed the jettison nozzle would probably not be located so close to the fuselage but instead would be in a more outboard position as with the 767 (inboard of the outboard aileron on each wing).

I would still be interested to know if any airlines were actually forced to take the jettison option on the 757-200, or whether they all got around the regulation at the time.

I'm 99% sure that no 757 in the UK has this feature.
I used to love the smell of Jet-A in the morning...
 
Yikes!
Posts: 284
Joined: Sat Oct 13, 2001 4:51 pm

RE: 757 Fuel Jettison Equipment

Tue Jun 24, 2003 7:56 am

Look closely at the photo. Typical diameter of jettison nozzles is in the order of 1.5 - 2 inches.

Best Regards
 
RyDawg82
Posts: 833
Joined: Fri Sep 14, 2001 8:30 am

RE: 757 Fuel Jettison Equipment

Tue Jun 24, 2003 10:08 am

Alright, Im a fool, thinking rubber is a jettison....  Smile Although you must admit at first glance it holds the shape, although not placement of a a jettison...Thanks for your help guys...Ryan
You can take the pup out of Alaska, but you can't take the Alaska out of the pup.
 
Yikes!
Posts: 284
Joined: Sat Oct 13, 2001 4:51 pm

RE: 757 Fuel Jettison Equipment

Tue Jun 24, 2003 10:47 am

A good pilot always recognizes a rubber.

Or piece of rubber.

Whatever...

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