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Stabilizer Fuel Tank On 744 Pax To Freight  
User currently offlineMax Q From United States of America, joined May 2001, 4780 posts, RR: 19
Posted (2 years 5 months 3 weeks 2 days 2 hours ago) and read 3564 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 (2 years 5 months 3 weeks 1 day 22 hours ago) and read 3492 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 (2 years 5 months 3 weeks 1 day 22 hours ago) and read 3484 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 offlineCCA From Hong Kong, joined Oct 2002, 846 posts, RR: 14
Reply 3, posted (2 years 5 months 3 weeks 1 day 19 hours ago) and read 3431 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 (2 years 5 months 3 weeks 1 day 19 hours ago) and read 3417 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, 4780 posts, RR: 19
Reply 5, posted (2 years 5 months 3 weeks 1 day 13 hours ago) and read 3315 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 (2 years 5 months 3 weeks 1 day 12 hours ago) and read 3284 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, 4780 posts, RR: 19
Reply 7, posted (2 years 5 months 3 weeks 3 hours ago) and read 3021 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 (2 years 5 months 2 weeks 3 days 12 hours ago) and read 2711 times:

How come they disable it, out of interest?

User currently onlineStarlionblue From Greenland, joined Feb 2004, 17173 posts, RR: 66
Reply 9, posted (2 years 5 months 2 weeks 3 days 10 hours ago) and read 2680 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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