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Stabilizer Fuel Tank On 744 Pax To Freight

Max Q From United States of America, joined May 2001, 3289 posts, RR: 19
Posted (10 months 3 weeks 2 days 16 hours ago) and read 2400 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

imiakhtar From , joined Dec 1969, posts, RR:
Reply 1, posted (10 months 3 weeks 2 days 13 hours ago) and read 2328 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.

imiakhtar From , joined Dec 1969, posts, RR:
Reply 2, posted (10 months 3 weeks 2 days 12 hours ago) and read 2320 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

CCA From Hong Kong, joined Oct 2002, 707 posts, RR: 14
Reply 3, posted (10 months 3 weeks 2 days 10 hours ago) and read 2267 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.

C152 G115 TB10 CAP10 Be76 C500 A330-300 A340-300 -600 B747-200F -200SF -400 -400F -400BCF -400ERF -8F

tdscanuck From Canada, joined Jan 2006, 12709 posts, RR: 81
Reply 4, posted (10 months 3 weeks 2 days 9 hours ago) and read 2253 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.

Max Q From United States of America, joined May 2001, 3289 posts, RR: 19
Reply 5, posted (10 months 3 weeks 2 days 3 hours ago) and read 2151 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.

tdscanuck From Canada, joined Jan 2006, 12709 posts, RR: 81
Reply 6, posted (10 months 3 weeks 2 days 2 hours ago) and read 2120 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.

Max Q From United States of America, joined May 2001, 3289 posts, RR: 19
Reply 7, posted (10 months 3 weeks 17 hours ago) and read 1857 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.

ajd1992 From UK - England, joined Jul 2006, 2645 posts, RR: 6
Reply 8, posted (10 months 2 weeks 4 days 3 hours ago) and read 1547 times:

How come they disable it, out of interest?

Starlionblue From Hong Kong, joined Feb 2004, 15870 posts, RR: 66
Reply 9, posted (10 months 2 weeks 4 days 1 hour ago) and read 1516 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." - from Citadel by John Ringo

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