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| EXWOK
December 14, 2017, 13:35:00 GMT permalink Post: 9989964 |
Tanks 5 and 7 inlet valves have an \x91override\x92 position, do they not?
During the t/o roll, while the trim transfer pumps in 11 will be off, the de-air pump would allow flow through the trim transfer pipes to any tank with an open valve. The valves *should* be closed, unless someone had been creative with any override selections and failed to return them to normal. Subjects
Intakes
Trim
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| Shaggy Sheep Driver
December 14, 2017, 15:14:00 GMT permalink Post: 9990046 |
Subjects
C of G
Trim
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| EXWOK
December 15, 2017, 01:03:00 GMT permalink Post: 9990585 |
I\x92m not sure we *know* the tank 11 txfr pumps were on.
The 5/7 inlet valves were in the override position. Even if the T11 txfr pumps were off, the de-air pump would pump fuel to the trim txfr pipes and hence to 5/7. All assuming I remember the report correctly. The nub being, if you \x91hide\x92 fuel and forget to return the 5/7 inlet valves to normal, you will still feed 5/7 even if the 11 pumps are off. Subjects
Intakes
Trim
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| HarryMann
October 18, 2019, 23:44:00 GMT permalink Post: 10597991 |
M2dude,
Re the MEPU at the Le Bourget museum... The story I just got was that it was taken off F-WTSA or F-WTSB at Roissy for a fault and replaced (both 'SA and 'SB operated out of Roissy around '74 / '75 for things like route proving, etc.). It got left on a shelf in a store, and was only discovered again in 2003 during the "big clean-out" and was saved 'in extremis' by somebody who recognised it for what it was, stopped it from being 'binned' and took it over to the museum. Initially of couse it was. It was not until the return to subsonic, towards the end of the flight, that the contents of the n\xb0 11 trim tank were moved forward again to the other tanks. So yes, you're right, essentially all of it was "useable" fuel, it did not serve only for the trim. Don't we all.... Jock Lowe seems to have stated there is a photo.... and we all still wonder if there is some footage taken from the Lear Jet during the filming of "Airport 79". But none is publicly known to exist ... we just know it's been done! Subjects
F-WTSA
F-WTSB
Le Bourget
MEPU (Monogol Emergency Power Unit)
Trim
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| Lauren Pilla
January 22, 2020, 16:26:00 GMT permalink Post: 10668831 |
Mr Vortex
Finally as promised, here is a schematic of the AFT part of the fuel vent system. As you can tsee the fin intake pressurises the air space above tank 11, and hence, via the Scavenge Tank air-space, the remaining tanks. (Also you can see the Trim Pipe Drain Vaves you were asking about. Regards Dude hi! I know I may be super late to the party here, wondering if you have another picture of that fuel vent schematic? I can\x92t seem to see that one, maybe it\x92s been too long. Anyway it\x92d be much appreciated. Thank you! Subjects
Fuel Vent System
Intakes
Trim
Vortex
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