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unserviceable, and in addition to the case for two unserviceable reversers, it takes into
account the possibility of asymmetric thrust lever handling. In normal operations,
unlike for aircraft with hydromechanical thrust levers, a thrust lever staggering is never
used on the A320. In a previous MEL the standard procedure for selecting reverse
thrust in case of one unserviceable thrust reverser was to retard both levers to idle, but
then select reverse thrust only for the working reverser. As in the case for two u/s
thrust reversers, not selecting reverse thrust with unarmed Ground Spoilers presents a
hazard, additionally there is the hazard of selecting reverse thrust on one engine while
leaving the other engine at (maximum or flexible) takeoff thrust. Retarding only one
thrust lever to idle while leaving the other at takeoff thrust, if handled properly, is not a
hazard, since the aircraft is certified for one-engine-out takeoff operations, although
usually takeoff is rejected if an engine fails before v1.
Notes:
1/ This state machine assumes both reversers inop, which is allowed according to MEL
2/ Not arming ground spoilers for Take-off will be displayed blue in Take-off memo
Bottom line will show TEST in blue.
3/ Disarming Ground Spoilers by pushing down the speedbrake lever after T.O
Memo bottom line shows NORMAL will revert SPLRS line to blue.
However, bottom line will continue to show NORMAL in green!
This has been tested in a Fixed-Base Simulator.
Behaviour of actual aircraft may differ.
4/ Not arming ground spoilers for Take-off is a violation of SOP.
5/ Selecting Reverse with both thrust reversers inop is a violation of SOP
6/ Not selecting Reverse thrust on either engine is SOP (MEL) for
A320 with both reversers inop.
Here following a SOP will lead to a rejected Take-off with no ground spoilers
and no automatic brake
This is a Hazard.
7/ Not Arming the autobrake will leave a blue line in ECAM Memo and not change
T.O Config from Test to NORMAL.
Take-off prepared
Take-Off Memo displayed
Ground Spoilers not armed
ECAM-Take-off-Memo shows
T.O Config .... Test
Ground Spoilers armed
ECAM-Take-off-Memo shows
T.O Config Normal
Speedbrake
lever
moved up
Speedbrake
lever
moved up
Take-off run,
Ground Spoilers not armed
Take-off thrust
set
Speedbrake
lever
moved down
Take-off run,
Ground Spoilers armed
Take-off thrust
set
Normal Takeoff
v >= v1
Low-speed reject,
No Ground Spoilers,
No Autobrake
AND v < 72kts
AND OR Both TL IDLE
OR AND One TL IDLE
AND One TL REV
OR Both TL REV
Rejected Take-off,
Ground Spoilers,
Autobrake
AND v >= 72kts
AND v < v1
OR AND One TL IDLE
AND One TL REV
OR Both TL REV
Rejected Take-off,
No Ground Spoilers,
No Autobrake
AND v >= 72kts
AND v < v1
AND Both TL IDLE
v >= v1
AND v < 72kts
AND OR Both TL IDLE
OR AND One TL IDLE
AND One TL REV
OR Both TL REV
AND v >= 72kts
AND v < v1
AND OR Both TL IDLE
OR AND One TL IDLE
AND One TL REV
OR Both TL REV
Notes:
1/ This state machine assumes one thrust reverser inop, which is allowed according to MEL
2/ ECAM T.O Memo will display T.O CONFIG NORMAL when Ground Spoilers are armed
(and all other tasks are done.) Unarming them again will display
SPLRS ... ARM (blue), but T.O CONFIG NORMAL remains, and does not
revert to TEST (blue).
3/ Not arming ground spoilers for Take-off is a violation of SOP.
4/ Not retarding both thrust levers to idle is a violation of SOP
5/ Not selecting reverse thrust on any engine with operable reverser is
a violation of SOP.
Take-off prepared
Take-Off Memo displayed
Ground Spoilers not armed
ECAM-Take-off-Memo shows
T.O Config .... Test
Ground Spoilers armed
ECAM-Take-off-Memo shows
T.O Config Normal
Speedbrake
lever
moved up
Speedbrake
lever
moved up
Take-off run,
Ground Spoilers not armed
Take-off thrust
set
Speedbrake
lever
moved down
Take-off run,
Ground Spoilers armed
Take-off thrust
set
High-Speed Take-off run,
Ground Spoilers not armed
v >= 72 kts
Low-speed reject,
No Ground Spoilers,
OR Both TL IDLE No Autobrake
OR AND One TL IDLE
AND One TL REV
OR Both TL REV
High Speed Take-off run,
Ground Spoilers armed
v >= 72 kts
OR Both TL IDLE
OR AND One TL IDLE
　
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