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Stabilizer Fuel Tank On 744 Pax To Freight  
User currently offlineMax Q From United States of America, joined May 2001, 4071 posts, RR: 19
Posted (1 year 9 months 3 weeks 1 day 3 hours ago) and read 3236 times:

I think that most if not all 744 Factory delivered freighters do not have the horizontal stabilizer fuel tank of the pax version.



What, if anything is done with this tank on the Pax to freight conversions, is it retained in service, locked out or even completely removed ?


The best contribution to safety is a competent Pilot.
9 replies: All unread, jump to last
 
User currently offlineimiakhtar From , joined Dec 1969, posts, RR:
Reply 1, posted (1 year 9 months 3 weeks 1 day ago) and read 3164 times:

Quoting Max Q (Thread starter):
What, if anything is done with this tank on the Pax to freight conversions, is it retained in service, locked out or even completely removed ?

The Boeing passenger-2-freighter conversion kit for the 744 requires the tank in the HST to be locked out. The fuel tank remains in place. The deactivation of the tail tank reduces a freighter's fuel capacity by around 12 500 litres.

There is also a Bedek conversion option in the land of Palestine which is slightly cheaper than the Boeing conversion. I believe the FAA/EASA issued a separate STC for it. I'm not sure if they retain or remove the tank.


User currently offlineimiakhtar From , joined Dec 1969, posts, RR:
Reply 2, posted (1 year 9 months 3 weeks 1 day ago) and read 3156 times:

After a little digging around, I managed to find the Bedek STC. The Bedek conversion also deactivates the tail fuel tank.

http://www.airweb.faa.gov/Regulatory...257888006a2056/$FILE/ST01706SE.pdf


User currently onlineCCA From Hong Kong, joined Oct 2002, 797 posts, RR: 14
Reply 3, posted (1 year 9 months 3 weeks 21 hours ago) and read 3103 times:

You can't remove the tank as the tank is the stabiliser, all that's done is removal of all the fuel tank plumbing, valves, pumps etc.


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User currently offlinetdscanuck From Canada, joined Jan 2006, 12709 posts, RR: 80
Reply 4, posted (1 year 9 months 3 weeks 20 hours ago) and read 3089 times:

Quoting Max Q (Thread starter):
What, if anything is done with this tank on the Pax to freight conversions, is it retained in service, locked out or even completely removed ?

It's a "wet wing" tank; there is no physically separate tank, they just seal the wing box of the horizontal stabilizer and fill it with fuel. As a result, it's impossible to remove.

Tom.


User currently offlineMax Q From United States of America, joined May 2001, 4071 posts, RR: 19
Reply 5, posted (1 year 9 months 3 weeks 14 hours ago) and read 2987 times:

Quoting tdscanuck (Reply 4):

It's a "wet wing" tank; there is no physically separate tank, they just seal the wing box of the horizontal stabilizer and fill it with fuel. As a result, it's impossible to remove.

Thanks Tom, are there any 744F operators that had the stab fuel tank installed and / or use it ?



The best contribution to safety is a competent Pilot.
User currently offlinetdscanuck From Canada, joined Jan 2006, 12709 posts, RR: 80
Reply 6, posted (1 year 9 months 3 weeks 13 hours ago) and read 2956 times:

Quoting Max Q (Reply 5):
Thanks Tom, are there any 744F operators that had the stab fuel tank installed and / or use it ?

I don't believe so. There might be STCs out there to do it but the incremental range from the stab tank doesn't play very well into most freighter companys' route structures. In addition, all the stab tanks got deactiavated after TWA-800 and there is a significant raft of service bulletins that have to be done to reactivate them; I don't think any of the freighter guys have done that.

Tom.


User currently offlineMax Q From United States of America, joined May 2001, 4071 posts, RR: 19
Reply 7, posted (1 year 9 months 2 weeks 6 days 5 hours ago) and read 2693 times:

Quoting tdscanuck (Reply 6):

I don't believe so. There might be STCs out there to do it but the incremental range from the stab tank doesn't play very well into most freighter companys' route structures. In addition, all the stab tanks got deactiavated after TWA-800 and there is a significant raft of service bulletins that have to be done to reactivate them; I don't think any of the freighter guys have done that.

Interesting. Thanks



The best contribution to safety is a competent Pilot.
User currently offlineajd1992 From , joined Dec 1969, posts, RR:
Reply 8, posted (1 year 9 months 2 weeks 2 days 14 hours ago) and read 2383 times:

How come they disable it, out of interest?

User currently offlineStarlionblue From Greenland, joined Feb 2004, 16908 posts, RR: 67
Reply 9, posted (1 year 9 months 2 weeks 2 days 12 hours ago) and read 2352 times:

Quoting ajd1992 (Reply 8):
How come they disable it, out of interest?

AFAIK no need for it given the shorter sectors flown by freight operators. Or more correctly having it active costs relatively too much money given the route structures.

[Edited 2012-07-06 16:56:55]


"There are no stupid questions, but there are a lot of inquisitive idiots."
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