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The remaining stall warning functions are available with the disconnect button held. Only the push function is disabled with either switch held. All other SPS functions operate normally.
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual Volume 2
STALL PROTECTION COMPONENTS (CONT'D)
Stall Pusher On/Off Switches
The stall pusher “ON/OFF”switches are used for long term disabling of the pusher system. The switches are located on the pilot and copilot side panels.
NOTE
Selecting either stall pusher switch to “OFF”will cause a “STALL PROTECT FAIL”caution message to be displayed.
PILOT’S SIDE PANEL COPILOT’S SIDE PANEL
In the event of a malfunction, the stick pusher may be disabled by selecting the PUSHER switch to the “OFF”position on the pilot or copilot’s stall protection panel. When either or both switches are selected to “OFF”the SPC cannot command a push.
STALL PROTECTION OPERATION
In flight the stall protection computer uses numerous system inputs to calculate the angle of attack trip points. As a high angle of attack is approached:
. Ignition is activated.
If the angle of attack continues to increase:
.
The stick shakers are activated.
.
Autopilot disengages.
.
. Voice advisory sounds. If the angle of attack continues to increase:
.
The pitch disconnect system will lock.
.
The stick pusher mechanism is activated.
" STALL "
Volume 2 Flight Crew Operating Manual Rev 2A, Apr 11, 2005
STALL PROTECTION OPERATION (CONT'D)
This results in both control columns advancing to the full forward limit to correct the stall condition.
. The word “STALL”appears in a red box on the attitude sphere during the push phase.
Primary Flight Display
The stall annunciation shall initially blink at a rate of 1 second on and . seconds off for 5 seconds and then shall remain steady.
When stall has been corrected the SPC will cancel:
.
The push and pitch disconnect locking mechanism.
.
“STALL”on the attitude sphere.
.
Voice advisory.
.
Stick shakers.
.
Ignition.
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual Volume 2
STALL WARNING ADVANCE
In specific conditions the SPC will cause warnings to occur sooner than normal. The stall warning advance system will advance the stick shaker firing angles through the SPC when these conditions are sensed. Examples of conditions leading to a stall warning advance are listed below.
.
Slat malfunction
.
Flap malfunction
.
Flight in icing conditions with wing anti.ice off or failed.
The pilot has an interface through the Electrical Management System (EMS)/Control Display Unit (CDU) to select the stall warning advance for undetected failures (example: damage of slat panel due to bird strike or ice accumulation on the wing which cannot be dispersed). Either pilot’s EMS/CDU can command mode changes from the control page 1/2. Once selected it can only be canceled by pilot input. The two modes of operation selectable on the EMS/CDU are “NORM or ADVANCE”.
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