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The start valve opens if the ENG MODE selector is set to CRANK or IGN/START and N2 < 20%.
Both pack valves close during the start sequence.
The blue ON light illuminates.
Note: The start valve closes automatically when N2 ≥ 50%.
6. What is an indication that the start sequence is complete?
At ISA sea level (2-4-6-6):
N1 approximately 19.5%
EGT approximately 390°C
N2 approximately 58.5%
FF approximately 600 lb/hr
Gray background on N2 indication disappears.
7. What is the minimum oil quantity for dispatch?
13 quarts
8. Operationally, which engine do we start first? Why?
Engine 1 is started first under the assumption it will be a single engine taxi. This will ensure engine driven Green
hydraulic pump pressure will be available for normal brakes and nosewheel steering.
9. If the #1 ENG MAN START pb is depressed, will the engine begin to motor?
The start valve opens if the ENG MODE selector is set to CRANK or IGN/START and N2 < 20%.
10. Is there a mechanical connection between the thrust levers and the engines?
There is no mechanical connection between the levers and engines. The position of each lever (TLA) is
electronically measured and transmitted to the FADEC, which computes the thrust rating limit.
Fuel
1. Can fuel be suction fed to the engines?
If the wing tank pumps fail, suction feeding is possible only from the inner wing cells (A319/320), or the wing tank
(A321).
2. The outer wing tank transfer valves (A319&320) automatically open when the wing inner cell fuel
quantity drops to _1,650_ pounds?
3. When and how is fuel normally transferred from the outer to inner wing tanks?
2009 – 2010 TGS Study Guide
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Unofficial Airbus Study Site www.airbusdriver.net
The wing tank transfer valves automatically latch open when the wing inner cell fuel quantity drops to 1,650 lbs
thus allowing the outer cell fuel to drain into the inner cell. The transfer valves open simultaneously in both wings
and remain open until the next refueling operation. During steep descents and acceleration/deceleration, the
transfer valves may open prematurely and trigger a LO LVL warning.
4. Can either wing tank feed either or both engines?
The crossfeed valve permits one engine to be fed by both sides, or both engines to be fed from one side. The valve
is operated by two electric motors.
5. What is the normal fuel feed sequencing?
A319/320: Normal fuel feed sequencing is automatic. When there is fuel in all tanks, the center tank feeds the
engines first (even though the wing tank pumps operate continuously).
With the fuel MODE SEL pb in AUTO, the center tank pumps operated for two minutes after both engines are
started to confirm center tank pump operation prior to takeoff. After takeoff, the center tank pumps restart when
the slats are retracted and continue to operate for five minutes after the center tank is empty or until the slats are
extended.
With the MODE SEL pb in MAN, the center tank pumps operate continuously. The crew must select the CTR TK
PUMP pbs OFF when the center tank is empty.
A321: The fuel transfer system controls the flow of fuel from the center tank to the wing tanks, which feed the
engines. The tanks empty in the following sequence:
1. ACT transfers fuel into the center tank
2. Center tank transfers fuel into the wing tanks
3. Wing tanks
With the MODE SEL pb in AUTO, the Fuel Level Sensing Control Unit (FLSCU) has automatic control of the transfer
valve. When the transfer valve is open, fuel from the wing tank pumps flows through the jet pump and creates
suction. This suction moves the fuel from the center tank to the related wing tank. The FLSCU automatically closes
the associated center tank transfer valve when the wing tank is full. The transfer valve reopens the center tank
transfer valve when the engines have used 550 lbs of wing tank fuel.
With the ACT pb in AUTO, automatic control of the transfer occurs after takeoff at slats retraction. It is initiated if
the center tank high level sensor has been dry for 10 minutes and fuel remains in either ACT. Fuel transfer from
the ACTs to the center tank is made by pressurizing the ACT, closing the ACT vent valves, and opening the air
shut-off and inlet valves. ACT2 transfers first.
With the MODE SEL in MAN, the center tank transfer valves open. Wing tank overflow must be prevented by
selecting the CTR TK XFR pbs OFF when the wing tanks are full. They must also be selected OFF when the center
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