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the horizontal stabilizer. The horizontal stabilizer is positioned by a screw jack driven by two
electric motors controlled by the horizontal stabilizer trim control unit (HSTCU) through a
motor control unit (MCU). Each motor has a magnetic brake to prevent trim runaway. Trim
range is from +2_ (leading edge up) to --13_ (leading edge down).
The HSTCU has two channels that are engaged by selection of the STAB TRIM, CH1 and
CH2 engage switches on the center pedestal. The horizontal stabilizer is positioned, by
manual operation of the control wheel trim switches or automatically by the autopilot trim or
Mach trim systems. During AFCS operation, the trim rate is influenced by flap movement.
Trim disconnect switches are provided on each control wheel to disengage the stabilizer
trim.
The Mach trim system is selected by engaging the Mach TRIM switchlight on the center
pedestal. The Mach trim function of the HSTCU repositions the horizontal stabilizer to make
allowances for the rearward shift of the aerodynamic center of pressure as the airspeed
increases above Mach 0.4. At least one STAB channel must be engaged for the Mach trim
to function.
The HSTCU operates in one of four modes in the following order of priority:
S Manual trim -- Nose--up or nose--down trim commands (from the control wheel switches)
are sent to the HSTCU which moves the screw jack at a rate that is dependent on Mach
airspeed.
S Autopilot -- When the AP is engaged, the horizontal stabilizer is trimmed at two rates.
High rate (0.5_ per second) occurs when the flaps are extending and retracting and low
rate (0.1_ per second) occurs when the flap are stationary.
S AUTO trim -- Auto trim occurs when the flaps are moving between 0 -- 20_ in either
direction. In this condition the horizontal stabilizer is automatically trimmed to
compensate for aircraft pitching caused by flap configuration changes.
S Mach trim -- When the Mach trim is engaged, the horizontal stabilizer trim is adjusted (at a
rate of 0.03_ to 0.06_per second) to compensate for the aircraft tendency to pitch down
at increasing Mach numbers. The Mach TRIM function is disabled when the autopilot is
engaged.
NOTE
If the horizontal stabilizer is in motion at the high or
slow rate for more than 3 seconds, a clacker is
activated to alert the crew of a possible horizontal
stabilizer trim runaway condition.
Horizontal stabilizer trim position indication is displayed on the EICAS Status page and on
the FLT CONTROL synoptic page.
REV 56, Jan 31/03
Vol. 1 11--50--2
FLIGHT CONTROLS
Horizontal Stabilizer Trim
Flight Crew Operating Manual MASTER
CSP A--013
NOTE
The T/O CONFIG OK advisory message will come on
when the horizontal stabilizer trim indication is within
the green band on the stabilizer trim scale. <0039>
Vol. 1 11--50--3
REV 56, Jan 31/03
FLIGHT CONTROLS
Horizontal Stabilizer Trim
Flight Crew Operating Manual
CSP A--013
MASTER
Horizontal Stabilizer System
Figure 11---50---1
HORIZONTAL
STABILIZER
PILOT
CONTROL
WHEEL
COPILOT
DC ESS BUS
DC BUS 2
AC ESS
BUS
AC BUS 2
AC ESSENTIAL
BUS
AC BUS 2
A
A HORIZONTAL
STABILIZER
ACTUATOR
CONTROL
WHEEL
REV 56, Jan 31/03
Vol. 1 11--50--4
FLIGHT CONTROLS
Horizontal Stabilizer Trim
Flight Crew Operating Manual MASTER
CSP A--013
Stabilizer/ Mach Trim Control Panel
Figure 11---50---2
Stabilizer/ Mach Trim Panel
Center Pedestal
STAB TRIM
Used to engage
respective
stabilizer trim
channel.
MACH TRIM
Used to engage Mach trim
function.
To disengage the Mach
trim function, press the
MACH TRIM switch/light;
INOP light (amber)
comes on.
Stabilizer Trim --- Pilot’s Control Wheel
Figure 11---50---3
TOP VIEW
STAB TRIM DISC (red)
Used to disengage
stabilizer trim control.
NOSE UP / NOSE DN (black)
Used to manually operate
stabilizer trim.
Pilot’s Control Wheel
(Copilot’s Opposite)
Vol. 1 11--50--5
REV 56, Jan 31/03
FLIGHT CONTROLS
Horizontal Stabilizer Trim
Flight Crew Operating Manual
CSP A--013
MASTER
Elevator Mistrim Flag --- PFD <MST>
Figure 11---50---4
<0015>
E
Primary Flight Display
Pilot’s and Copilot’s Instrument Panels
E
REV 56, Jan 31/03
Vol. 1 11--50--6
FLIGHT CONTROLS
Horizontal Stabilizer Trim
Flight Crew Operating Manual MASTER
CSP A--013
Horizontal Stabilizer Trim --- EICAS Messages <MST>
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