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Figure 11---50---5
Primary Page
<0006>
STAB TRIM caution (amber)
Comes on to indicate that both channels of
the HSTCU have failed or are disengaged.
<0039>
MACH TRIM caution (amber)
Comes on to indicate that the Mach trim
function has failed or is disengaged.
CONFIG
TRIM
Vol. 1 11--50--7
REV 56, Jan 31/03
FLIGHT CONTROLS
Horizontal Stabilizer Trim
Flight Crew Operating Manual
CSP A--013
MASTER
Horizontal Stabilizer Trim --- EICAS Indications <MST>
Figure 11---50---6
Stabilizer Trim Pointer
Moves up and down along the
trim scale to indicate trim position.
Green -- Stabilizer position is in
take--off configuration.
White -- Stabilizer position is not
in take--off configuration.
STAB TRIM CH 1/2 INOP status (white)
Comes on to indicate that the respective
channel of the stab trim has failed.
STAB TRIM caution (amber)
Comes on to indicate that both channels
of the HSTCU have failed.
Status Page
STAB CH (1, 2) INOP status (white)
Comes on to indicate that the respective
channel is not engaged with the other
channel engaged.
<0039>
STAB
NU
ND
<0039>
<0039>
FLT Control Synoptic Page
<0039>
14
<0039> <0039>
<0039>
<0039>
Stabilizer Trim Readout
Displays stabilizer trim position.
Green -- Stabilizer position is in
take--off configuration.
White -- Stabilizer position is not
in take--off configuration.
Stabilizer Trim Scale (white)
Green band -- Stabilizer trim
take--off range.
ND mark -- Stabilizer at
maximum nose down trim limit.
NU mark -- Stabilizer at
maximum nose up trim limit.
Intermediate marks -- 5 trim
units and 10 trim units.
REV 56, Jan 31/03
Vol. 1 11--50--8
FLIGHT CONTROLS
Horizontal Stabilizer Trim
Flight Crew Operating Manual MASTER
CSP A--013
A. System Circuit Breakers
SYSTEM SUB--SYSTEM CB NAME BUS BAR CB
PANEL
CB
LOCATION
NOTES
Horizontal
STAB CH 1
HSTCU DC BUS 2 2 F5
Horizontal
Stabilizer
Trim Control
Unit
STAB CH 2
HSTCU DC ESS 4 A1
Stabilizer Trim
Horizontal
Stabilizer Trim
STAB CH 1
HSTA AC BUS 2 2 B8
Actuator STAB CH 2
HSTA AC ESS 3 A5
Vol. 1 11--60--1
REV 56, Jan 31/03
FLIGHT CONTROLS
Flaps
Flight Crew Operating Manual
CSP A--013
MASTER
1. FLAPS
The flap system provides lift augmentation during take-off and landing. The flap system
consists of externally hinged inboard and outboard flap panels mounted on the trailing edge
of each wing. Flap settings (to a maximum of 45 degrees) are selected from a single flap
control lever, located on the center pedestal. The flap system is controlled and monitored by
a flap electronic control unit (FECU). During extension, the flaps move slightly aft and down
around hinge pivots.
The flap system is driven by a dual motor power drive unit. The power drive unit drives the
flaps through a series of drive shafts, gearboxes and actuators. Brake and position sensor
units, mounted at the outboard ends of each drive system, provide braking for asymmetric
protection and provide surface position feedback to the FECU.
The flap selector has the following selectable flap detent positions:
S 0 degrees, 20 degrees, 30 degrees, and 45 degrees.
S 0 degrees, 8 degrees, 20 degrees, 30 degrees, and 45 degrees. <0006>
The lever quadrant feature a gate at the 20 degree setting. The gate prevents inadvertent
flap selection to 0 degrees during a missed approach and precludes VFE (flaps 30) from
being exceeded. To move the lever through the gate, it must be pushed down (against a
spring) an then moved forward or aft.
The lever quadrant features two gates, one at the 8 degree setting and one at the 20 degree
setting. The gate at the 8 degree setting prevents inadvertent flap selection to 0 degrees
during a missed approach (go--around) and the gate at 20 degrees, precludes VFE (flaps 30)
from being exceeded. To move the lever through a gate, it must be pushed down (against a
spring) an then moved forward or aft. <0006>
When a flap selection is made, the FECU releases the system brakes and commands the
power drive unit to deploy or retract the flaps to the selected position.
NOTE
1. An overspeed clacker will sound if the airspeed is too high for
the selected flap setting.
2. To ensure that the correct flap position is selected for
go--around, make sure that the back face of the flap lever is
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