(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. (g) The fuel jettisoning valve must be designed to allow flight personnel to close the valve during any part of the jettisoning operation. 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. (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. (4) The jettisoning operation does not adversely affect the controllability of the airplane. (3) Fuel or fumes do not enter any parts of the airplane and (2) The fuel discharges clear of any part of the airplane
#Fuel crossfeed systems are used in aircraft to free#
(1) The fuel jettisoning system and its operation are free from fire hazard (d) During the flight tests prescribed in paragraph (c) of this section, it must be shown that.
(3) Level flight at 1.3 V SR1 if the results of the tests in the conditions specified in paragraphs (c)(1) and (2) of this section show that this condition could be critical. You would most often use Crossfeed when one of the boost pumps fails. If the Crossfeed switch is set to OFF, both fuel systems are isolated. (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 Although the A-10C fuel system is designed with two parallel fuel systems, setting the Crossfeed switch to CROSSFEED will link the two fuel systems and allow the boost pumps to feed both engines. (c) Fuel jettisoning must be demonstrated beginning at maximum takeoff weight with flaps and landing gear up and in. (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 (c) of this section. I usually just flip it open, give it a few seconds, check the fuel levels then flip it back to close.Ĭrossfeed can take a while to achieve the same thing.(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. Generally I only use it as a last resort though, when I've already got a large fuel imbalance and want to QUICKLY even the tanks out. The sump fuel will not flow between the tanks. Fuel in the main tanks will be below the tank gate valve and will not transfer in level flight when the fuel level is below 1,300 pounds in each main tank.
"OPEN supplies power to open the gate valve linking the left and right main fuel tanks. The 476th cockpit familiarisation guide ( ) states: Generally you will want to keep this switch disabled as being enabled can lead to fuel center of gravity problems" Setting this switch to CLOSE will isolate the two tanks from each other. Linking the left and right main fuel tanks is a transfer valve that may be opened by setting the TK GATE switch to the OPEN position. Pretty sure if you get a fuel imbalance warning light on the caution panel flipping the tank gate switch gets rid of it and balances the tanks.
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