Max Q
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Stabilizer Fuel Tank On 744 Pax To Freight

Sun Jul 01, 2012 8:18 am

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.
 
imiakhtar
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RE: Stabilizer Fuel Tank On 744 Pax To Freight

Sun Jul 01, 2012 12:01 pm

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.
Whatever happened to Leon Trotsky?
 
imiakhtar
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RE: Stabilizer Fuel Tank On 744 Pax To Freight

Sun Jul 01, 2012 12:15 pm

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
Whatever happened to Leon Trotsky?
 
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CCA
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RE: Stabilizer Fuel Tank On 744 Pax To Freight

Sun Jul 01, 2012 2:51 pm

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.
P1 in A330, A340, A346, B742, B744, B748.
 
tdscanuck
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RE: Stabilizer Fuel Tank On 744 Pax To Freight

Sun Jul 01, 2012 3:18 pm

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
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RE: Stabilizer Fuel Tank On 744 Pax To Freight

Sun Jul 01, 2012 9:26 pm

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
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RE: Stabilizer Fuel Tank On 744 Pax To Freight

Sun Jul 01, 2012 10:43 pm

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
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RE: Stabilizer Fuel Tank On 744 Pax To Freight

Tue Jul 03, 2012 7:06 am

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
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ajd1992
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RE: Stabilizer Fuel Tank On 744 Pax To Freight

Fri Jul 06, 2012 9:48 pm

How come they disable it, out of interest?
 
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Starlionblue
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RE: Stabilizer Fuel Tank On 744 Pax To Freight

Fri Jul 06, 2012 11:55 pm

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]
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