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- pitch alternate
- pitch direct
- roll direct
- yaw alternate
- ailerons droop
- abnormal attitude law
- autopilot orders
- speed computation
OFF – computer off. Off then On resets it.
FAULT Lt – Amber with ECAM when fault detected. Extinguished when OFF.
SEC 1(2)
Control the FCSC (Flight control Secondary Computers)
ON : The following functions are provided by each computer
- pitch direct
- roll direct
- yaw alternate
- rudder trim
- rudder travel
OFF – computer off. Off then On resets it.
FAULT Lt – Amber with ECAM when fault detected. Extinguished when OFF.
TURB DAMP
ON – Command of Turbulence damping function is added to normal law elevator
and yaw damper command.
OFF – Turb damping function inhibited.
Overhead Panel Switches
23-Jan-07 For reference only
28. FUEL A340
L INR TANK 1(or R)(2,3,4)
Supplies fuel from its own collector cell which it shares with a STBY pump. This
collector cell is maintained full at 1,000kg for neg ‘g’ protection.
ON – Pump is on
OFF – Pump is off.
FAULT Lt – Amber with ECAM when pressure drops. Inhibited when OFF sel.
L INR TANK STBY 1(or R)(2,3,4)
ON – Pump runs when main pump fails or off
OFF – Pump is off
FAULT Lt – Amber with ECAM when pressure drops. Inhibited when OFF is
selected or main pump running.
L (or R) CTR TANK
ON – Pump always runs. Valves control xfr. Pump stops when tank empty.
OFF – Pump is off
FAULT Lt – Amber with ECAM when:
- delivery press drops or
- trim pipe isol valve is failed open or
- man xfr from CTR tank is required, and INR tank qtys are > 17000kg or
- one outer, inner inlet valve failed open and INR tank qtys are > 17000kg
Fault Lt is inhibited when sel OFF.
Overhead Panel Switches
23-Jan-07 For reference only
A340 FUEL SCHEMATIC
Overhead Panel Switches
23-Jan-07 For reference only
T.TANK MODE
AUTO – CG controlled by Fuel Control and Management Computer.
- Auto begins at L/G up and SLATS in – fwd XFR (failure case only). At FL 255 aft
XFR to target CG -0.5%. In cruise, fwd XFR to target CG -0.5% (burn = ↑aft CG).
- Auto ends at FL 245 or <35min (FMGS) to dest. (<75min if trim fwd XFR pump
failure)
Transfer from t.tank to inner tank occurs when one of the two inner tanks decreases to 4000kg
and stops at 5000kg.
FWD – Manual FWD transfer to centre tank using t.tank fwd transfer pump:
- t.tank isolation valve opens
- auxiliary fwd transfer valve opens
- trim pipe isolation valve closes
- aft transfer valves closes
Note: Centre tank overflow must be manually prevented.
FAULT Lt – Amber with ECAM if : - excess aft CG based on THS
- FCMC unable to fwd transfer
- FUEL LO TEMP warning triggered
T.TANK FEED
ISOL
AUTO AUTO – forward transfer is stopped when trim tank is low
level, to keep transfer line full
OPEN ISOL – transfer line is isolated by closing:
- t.tank isolation valve
- t.tank inlet valve - auxiliary forward transfer valve
- trim pipe isolation valve - t.tank forward transfer pump stops
OPEN – Valves used for manual fwd transfer open & t.tank inlet valve open. Valves remain open
for 3min after t.tank is low, to allow transfer pipe to drain.
Note: APU supply is not possible when pipe is drained.
X FEED 1 (4)
AUTO – Valve normally closed. Both open automatically when:
- in electrical emergency config (if on RAT pump 1 only with STBY 4
as backup)
- jettisoning
ON – Valve opens
OPEN Lt – Green when fully open
Overhead Panel Switches
23-Jan-07 For reference only
X FEED 2 (3)
AUTO – Valve normally closed. Both open automatically when:
- in electrical emergency config (if on RAT pump 1 only with STBY 4
as backup)
- jettisoning
- aft transfer from inner tanks
ON – Valve opens
OPEN Lt – Green when fully open
CTR TK TXFR
AUTO – FCMC controls centre to inner tank transfer using the inner tank inlet valve,
cycling inner tank contents between full and 2,000kg below full.
MAN – Initiates centre to inner tank transfer by:
- inner tank inlet valves open.
To avoid inner tank overflow, centre tank pumps can be sel OFF.
FAULT Lt – Amber with ECAM when:
- inner tank L LEVEL and centre tank not empty, or
- FCMC unable to carry out transfer to inner tanks
OUTR TK TXFR
AUTO – FCMC controls outer to inner tank transfer using the outer tank transfer
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