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Overhead Panel Switches
10-Aug-10 For reference only 13
CARGO SMOKE PANEL
FWD AGENT (AFT AGENT)
Pressing - Squib is ignited and extinguishing agent is discharged into
appropriate compartment.
- 2 bottles ignite at once
- BTL 1 discharges into comp over ≈ 60sec
- BTL 2, slow flow metering system ensures concentration for
280min.
The SDCU (Smoke Detection Control Unit) monitors squib integrity and bottle pressure.
SQUIB Lt - White in case of positive test.
DISCH
BTL 1 or BTL 2 - White light when bottle is discharged
TEST
Pressing - smoke detectors in FWD, AFT, & BULK are tested by SDCU in sequence.
- BTL 1(2) Lts white
- isolation valves of ventilation system close
- SQUIB Lt white provided 1 of 2 filaments serviceable
- SMOKE Lt (AFT,FWD CARGO, AVNCS) Red with ECAM & chimes
Note: Each SDCU channel sounds its own warning which lasts about 25 seconds with a delay of
about 30 seconds between them.
Overhead Panel Switches
10-Aug-10 For reference only 14
27. FLIGHT CONTROLS
PRIM 1(2,3)
Control the FCPC (Flight Control Primary Computers)
ON : The following functions are provided by each computer
- normal pitch
- normal lateral
- MLA
- speed brakes, ground spoilers control logic
- 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
10-Aug-10 For reference only 15
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
10-Aug-10 For reference only 16
A340 FUEL SCHEMATIC
Overhead Panel Switches
10-Aug-10 For reference only 17
AUTO
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 - 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.
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