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NOTES
SECU 1A DC ESS 4 A2
SECU 1A & 1B
DC BAT
1 N8
SECU 2A & 2B
2 N8
Spoiler
SECU 2B DC ESS 4 A3
Spoilers
Electronic SECS PWR 1 DC BUS 1 1 F3
Control Unit SECS PWR 2 DC BUS 2 2 F3
SECS 1 PWR
3
DC ESS 4
A4
SECS 2 PWR
3
A5
REV 56, Jan 31/03
Vol. 1 11--70--10
FLIGHT CONTROLS
Spoilers
Flight Crew Operating Manual MASTER
CSP A--013
THIS PAGE INTENTIONALLY LEFT BLANK
Vol. 1 11--80--1
REV 56, Jan 31/03
FLIGHT CONTROLS
Stall Protection System
Flight Crew Operating Manual
CSP A--013
MASTER
1. STALL PROTECTION SYSTEM
The purpose of the stall protection system is to provide warning of an impending stall when
the aircraft attitude approaches a high angle--of--attack (AOA) and to prevent stall
penetration when the aircraft nears the computed stall angle. The system alerts the flight
crew by means of visual, aural, and feel (stick shaker) indications. If no corrective action is
taken, the system activates the stick pusher mechanism to prevent the aircraft from entering
a stall.
The stick pusher mechanism is armed by selecting the pilot’s and copilot’s STALL PTCT
pusher switches.
NOTE
Both the pilot and copilot STALL PTCT switches must
be selected ON to arm the stick pusher system.
Selecting either switch OFF disables the system.
Angle of attack vanes located on each side of the forward fuselage measure the aircraft
attitude in relation to the ambient airstream. The stall protection computer (SPC) uses the
AOA information and airspeed to compute the stall angle trip points.
When the aircraft approaches a high AOA, the stall protection computer will activate the
engines auto-ignition system. If the AOA continues to increase, the stick shaker is activated
and the autopilot is disengaged.
If the angle of attack still continues to approach the critical stall point, the stick pusher is
activated, the STALL switchlights flash red, and the warbler sounds. The stick pusher then
pushes the control column forward to give the aircraft a pitch down attitude. In the event of
an AOA rate increase greater than 1 degree per second, the SPC lowers the AOA trip point
to prevent the aircraft pitching momentum from carrying it through the stall warning/stick
pusher sequence into the stall.
The stick pusher can be stopped by pressing and holding the AP/SP DISC switch on the
pilot’s and copilot’s control wheel.
REV 56, Jan 31/03
Vol. 1 11--80--2
FLIGHT CONTROLS
Stall Protection System
Flight Crew Operating Manual MASTER
CSP A--013
Stall Protection System Schematic <MST>
Figure 11---80---1
STICK PUSHER ASSEMBLY
Vol. 1 11--80--3
REV 56, Jan 31/03
FLIGHT CONTROLS
Stall Protection System
Flight Crew Operating Manual
CSP A--013
MASTER
Testing of the stall protection system is initiated by momentarily pressing one of the STALL
switchlights, and verifying that:
S Auto--ignition is activated (CONT ON and CONT IGNITION status messages come on)
S Pilot’s and copilot’s stick shakers activate
S STALL switchlights flash
S Stick pusher is activated.
While in stick pusher mode:
S Pilots control column bounces back to neutral position when the AP/SP DISC button is
momentarily pressed
S Pilot’s control column will take several seconds to go back to the neutral position. Copilot
should pull (override) the control column and note diminished feel force loads while
momentarily pressing AP/SP DISC button
S Stick pusher is de--activated
S STALL switchlights go out
S Pilot’s and copilot’s stick shakers stop
S CONT ON and CONT IGNITION status messages go out.
NOTE
Pressing the pilot’s or copilot’s STALL switchlight a
second time during the test, will interrupt the test
sequence.
REV 56, Jan 31/03
Vol. 1 11--80--4
FLIGHT CONTROLS
Stall Protection System
Flight Crew Operating Manual MASTER
CSP A--013
Stall Protection Controls
Figure 11---80---2
STALL PROTECTION PUSHER
Lever Switch (locked at ON) (2)
ON -- Stick pusher is armed (both pilot’s
and copilot’s PUSHER switches must be
at ON position).
OFF -- Stick pusher is disabled.
Pilot and Copilot Control Wheels
AP/SP DISC (red)
Used to disengage autopilot and momentarily
de--activate stall protection system.
Press to disengage autopilot and
momentarily disable stick pusher.
Release to re--activate stick pusher.
When pressed for 4 seconds or longer,
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