(2)
Speedbrake order The speedbrake order comes from the order received from the speedbrake lever receveid by the SEC. The speedbrake control order is inhibited:
-
if the monitoring of the speedbrake control transducer unit has detected a failure (by means of the transducer unit range monitoring or COM/MON comparison),
-
if the alpha protection is active,
-
if in FULL configuration or configuration 3.
-
in case of single elevator configuration,
-
in case of loss of the Blue and Green hydraulic pressures.
-
if at least one throttle lever is above MCT (Maximum Continous Thrust) or
-
if full back stick associated with pitch altitude protection.
The deflection rate is limited to 3./sec.
In order to do the test of the spoiler 1 on the ground, a 6.
extension of the spoiler 1 is possible with the speedbrake control
lever.
(Ref. Fig. 012)
(3)
Pitch precommand
To reduce pitch effect at speedbrake movement.
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C. Speedbrake Function
(Ref. Fig. 011B)
(1)
General The speedbrake function is ensured by the spoilers 2, 3 and 4 and the associated SECs. The speedbrake deflection order is dependent upon the speedbrake control lever position: Splr 4: 25 deg, Splr 3: 25 deg, Splr 2: 25deg for SPD BRK lever fully deflected. The speedbrake order is combined with roll orders. In flight, when the aircraft speed is more than 315 knots or Mach
0.75 with the autopilot engaged, the speedbrake retraction rate decreases (approximately 25 seconds are necessary to retract the speedbrakes from FULL to IN).
(2)
Speedbrake order The speedbrake order comes from the order received from the speedbrake lever receveid by the SEC. The speedbrake control order is inhibited:
-
if the monitoring of the speedbrake control transducer unit has detected a failure (by means of the transducer unit range monitoring or COM/MON comparison),
-
if the alpha protection is active,
-
if in FULL configuration or configuration 3.
-
in case of single elevator configuration,
-
in case of loss of the Blue and Green hydraulic pressures.
-
if at least one throttle lever is above MCT (Maximum Continous Thrust) or
-
if full back stick associated with pitch altitude protection.
The deflection rate is limited to 3./sec.
In order to do the test of the spoiler 1 on the ground, a 6.
extension of the spoiler 1 is possible with the speedbrake control
lever.
(Ref. Fig. 012)
(3)
Not Applicable
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D. Ground Spoiler Function
(1)
General The ground spoiler function is ensured by all the spoilers. The surface deflection is 50 deg with an extension rate of 20 deg/s (in autopilot or manual mode).
(2)
Activation of the ground spoiler function. (Ref. Fig. 013) The activation of the ground spoiler function is dependent upon:
-
the function preselection, or one throttle lever at reverse
-
the two engines at low rate
-wheel speed information (of both main gears)
-the main landing gear wheel rotation more than 72kts
NOTE : Condition on wheel speed is inhibited after GND/FLT
____ transition. The condition is rearmed if wheel rotation stops. Consequently after an A/C bounce (A/C airborne):
-
the spoilers remain extended with thrust lever at idle
-
the spoilers retract if thrust is increased above idle (GA), and extend again after the next touch down.
-elevator pre command at the extension of the ground spoilers (manual only)
-the both main landing gears compressed while the altitude less than 6ft The preselection is made with the speedbrake control lever. The lever position must be lower than - 2 deg. This preselection can also be made through the selection of reverse thrust on both throttle control levers, or only one throttle control lever with the other control lever in position less than 20 deg. The "two throttle levers at low rate" information is given when the position of the two throttle control levers is less than 20 deg.
(3) Partial lift dumping This function, elaborated in the SECs, is actived at reverse selector if only one main landing gear is depressed. The spoilers 1 thru 5 are partially deflected in order to impact the second gear and consequently to activate the ground spoiler function.
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