14 replies to this topic

[747Rockamolies]

i have seen people do fuel dumping before and really, how
do you do it?

[Peter797]

Shift + D is default I think?

If not, just look in your controls. With proper fuel planning I don't see why you would need to.  If all you're hoping for is an Effect, there is none

[747Rockamolies]

thank you for the info

[THBatMan8]

Depends on the plane to. Not all planes can dump fuel (IE the Airbus A320) and IIRC, the only way on the default planes is the keyboard command (as mentioned above me). I'd suggest that you invest into some payware planes like the PMDG 744 and Level-D 767 if you want to learn more about the real aircraft's systems.

[Alaska_MD-83]

I know the 747, 727, DC8 and the A300 can dump. The 737 can't. I think  fuel dump is a factory option on the 757.

[THBatMan8]

Because the planes meet the requirements in FAR 25.119, they don't need to dump. The Jettison system on the 763 (for example) is a factory option. Even then, the 763 can only dump from the center manifold. Methinks it's a option on the A300 also.

Edited by THBatMan8, 20 May 2009 - 01:15 AM.

[THBatMan8]

Sorry, wrong FAR reference. I meant FAR 25.1001.  

Quote

(a) A fuel jettisoning system must be installed on each airplane unless it is shown that the airplane meets the climb requirements of §§25.119 and 25.121(d) at maximum takeoff weight, less the actual or computed weight of fuel necessary for a 15-minute flight comprised of a takeoff, go-around, and landing at the airport of departure with the airplane configuration, speed, power, and thrust the same as that used in meeting the applicable takeoff, approach, and landing climb performance requirements of this part.

B If a fuel jettisoning system is required it must be capable of jettisoning enough fuel within 15 minutes, starting with the weight given in paragraph (a) of this section, to enable the airplane to meet the climb requirements of §§25.119 and 25.121(d), assuming that the fuel is jettisoned under the conditions, except weight, found least favorable during the flight tests prescribed in paragraph © of this section.

© Fuel jettisoning must be demonstrated beginning at maximum takeoff weight with flaps and landing gear up and in—

(1) A power-off glide at 1.3 VSR1;

(2) A climb at the one-engine inoperative best rate-of-climb speed, with the critical engine inoperative and the remaining engines at maximum continuous power; and

(3) Level flight at 1.3 VSR1; if the results of the tests in the conditions specified in paragraphs ©(1) and (2) of this section show that this condition could be critical.

(d) During the flight tests prescribed in paragraph © of this section, it must be shown that—

(1) The fuel jettisoning system and its operation are free from fire hazard;

(2) The fuel discharges clear of any part of the airplane;

(3) Fuel or fumes do not enter any parts of the airplane; and

(4) The jettisoning operation does not adversely affect the controllability of the airplane.

(e) For reciprocating engine powered airplanes, means must be provided to prevent jettisoning the fuel in the tanks used for takeoff and landing below the level allowing 45 minutes flight at 75 percent maximum continuous power. However, if there is an auxiliary control independent of the main jettisoning control, the system may be designed to jettison the remaining fuel by means of the auxiliary jettisoning control.

(f) For turbine engine powered airplanes, means must be provided to prevent jettisoning the fuel in the tanks used for takeoff and landing below the level allowing climb from sea level to 10,000 feet and thereafter allowing 45 minutes cruise at a speed for maximum range. However, if there is an auxiliary control independent of the main jettisoning control, the system may be designed to jettison the remaining fuel by means of the auxiliary jettisoning control.

(g) The fuel jettisoning valve must be designed to allow flight personnel to close the valve during any part of the jettisoning operation.

(h) Unless it is shown that using any means (including flaps, slots, and slats) for changing the airflow across or around the wings does not adversely affect fuel jettisoning, there must be a placard, adjacent to the jettisoning control, to warn flight crewmembers against jettisoning fuel while the means that change the airflow are being used.

(i) The fuel jettisoning system must be designed so that any reasonably probable single malfunction in the system will not result in a hazardous condition due to unsymmetrical jettisoning of, or inability to jettison, fuel.

[Doc. No. 5066, 29 FR 18291, Dec. 24, 1964, as amended by Amdt. 25–18, 33 FR 12226, Aug. 30, 1968; Amdt. 25–57, 49 FR 6848, Feb. 23, 1984; Amdt. 25–108, 67 FR 70827, Nov. 26, 2002]

http://ecfr.gpoacces...-....39&idno=14

Edited by THBatMan8, 20 May 2009 - 01:55 AM.

[Independence76]

On default planes, you can dump fuel by Ctrl + Shift + D.

[Jonay]

Alt>Aircraft>Fuel and Payload  

There is a gauge out there for doing this, i have it on one of my Harriers (because they cant do vertical landings without anyless than 7% fuel)

Edited by Jonay1990, 20 May 2009 - 02:34 AM.

[niteye]

The best thing about alt -> aircraft -> fuel & payload is that if you're too heavy you can even dump cargo and passangers.

Imagine the crew throwing out passengers in midflight

[santraklos]

What does it when you dump the fuel? Why do you do it?

Edited by santraklos, 20 May 2009 - 07:49 AM.

[raybbj]

santraklos, on May 20 2009, 07:48 AM, said:

What does it when you dump the fuel? Why do you do it?

Why do you dump fuel ???? Is that what you're asking?
If you are too heavy and need to make an emergency landing shortly after take off

Edited by raybbj, 20 May 2009 - 09:51 AM.

[Flaminghotsauce]

santraklos, some aircraft are rated for higher takeoff weights than landing weights. If you take off full up, and have an emergency, you neeed to dump fuel to get below max landing weight.

[747Rockamolies]

thank you all guys for your help! i appreciate it.
and thank you again. and i wonder what it looks like when you dump people!!! hahaha!

[747Rockamolies]

yes, thank you again