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monitor relay
• An alternate boost pump fails, even with the main boost
pump not selected on
• An alternate boost pump power circuit breaker opens with the
pump running due to actuation of the alternate pump control
monitor relay
D. Fuel Ejectors:
A fuel ejector (often referred to as an ejector pump or jet pump and shown
in Figure 6) is a simple device that has no moving parts. It resembles and
operates like a venturi tube. It uses high pressure / low volume fluid as an
operating force to move a large volume of low pressure fluid in the desired
direction.
Each fuel hopper has a fuel ejector on the forward face of the forward wall
with the outlet projecting into the hopper. With a boost pump operating,
high pressure / low volume fuel flowing through the motive flow fuel line
from the pump manifold enters the ejector’s motive flow inlet.
As the motive flow fuel rushes out of the nozzle and enters the throat of the
venturi, it creates a low pressure area that in turn draws a large volume of
fuel from the wing tank and moves it at low pressure into the fuel hopper
through the ejector’s outlet. This induced fuel flow ensures the hopper
remains full at all times as the engines consume fuel. Any excess fuel in the
hopper overflows through the top of the hopper wall back into the wing
tank.
OPERATING MANUAL
PRODUCTION AIRCRAFT SYSTEMS 2A-28-00
Page 19
October 11/01
Revision 5
E. Fuel Shutoff Valves:
Shutoff valves are incorporated in the fuel distribution system to control
movement of fuel about the wing tanks, hoppers and to the engines. All
shutoff valves receive power from the Essential DC bus. The valves are
shown in Figure 3 and described as follows:
(1) Engine Fuel Feed Shutoff Valve:
An engine fuel feed shutoff valve is installed in each engine’s fuel
feed line. Each valve is normally open to allow passage of low
pressure fuel to the respective engine-driven low pressure fuel
pump. The valve is closed by pulling the respective FIRE handle,
located on the left and right forward sides of the cockpit center
pedestal.
(2) Crossflow Valve:
The fuel crossflow line is pressurized with fuel from the fuel pump
manifold pressure chamber. The fuel then waits in the crossflow line
at the normally-closed crossflow valve. Selection of the X FLOW
switch (cockpit overhead panel, Figure 8) opens the valve, allowing
fuel from the fuel pump manifold pressure chamber on one side to
flow to the chamber on the other side, enabling both engines to be
operated from one tank system. With the X FLOW switch selected
open, a horizontal bar in the switch capsule illuminates. In addition,
a blue FUEL XFLOW OPEN advisory message is displayed on
CAS. When selected closed, the bar extinguishes and the CAS
message is removed.
The crossflow valve is also opened for fuel balancing in accordance
with the limitations set forth in Section 1 of the GIV Airplane Flight
Manual.
(3) Intertank Valve:
The intertank valve is opened to combine the left and right hoppers.
Located in the right fuel hopper, the intertank valve is controlled by
the INTER TANK switch (cockpit overhead panel, Figure 8). When
selected open, a horizontal bar in the switch capsule illuminates. In
addition, a blue FUEL INT TNK OPEN advisory message is
displayed on CAS. When selected closed, the bar extinguishes and
the CAS message is removed.
F. Fuel Balancing Procedure:
If fuel balancing is required (either one or both engines operating), proceed
as follows:
(1) When fuel tank temperature is above 0° C or fuel contains an antiicing
additive:
(a) Select both boost pumps ON for the side having the higher
fuel state.
(b) Select the crossflow valve OPEN.
(c) Select both boost pumps OFF for the side having the lower
fuel state.
(2) When fuel tank temperature is below 0° C or fuel contains no antiicing
additive:
OPERATING MANUAL
2A-28-00 PRODUCTION AIRCRAFT SYSTEMS
Page 20
October 11/01
Revision 5
(a) Select all four boost pumps ON.
(b) Select the intertank valve OPEN.
(c) Establish a small sideslip (½ ball) in the appropriate direction.
(3) After fuel is balanced:
(a) Ensure all four boost pumps are ON.
(b) Select the crossflow valve CLOSED.
(c) Select the intertank valve CLOSED.
(d) Return to normal cruise operations.
CAUTION
THE INTERTANK VALVE IS USED FOR SUCTION
DEFUELING AND IS NOT TO BE USED IN FLIGHT
EXCEPT AS DESCRIBED IN THE PRECEDING
PROCEDURE, GIV OPERATING MANUAL SECTION
05-16-20: FAILURE OF TWO FUEL BOOST PUMPS
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湾流4操作手册 Gulfstream IV Operating Manual 2(36)
