EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH STAB TRIM LEVERS ú
22-22-00
ú ú 04 Page 5 ú Jan 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A07617
A
757
MAINTENANCE MANUAL
STABILIZER TRIM SEE G
ALTERNATE
(CAPTAIN'S) (FIRST OFFICER'S)
CONTROL SWITCH
STAB TRIM
SWITCHES
SEE E SEE D SEE F
STABILIZER TRIMCONTROL SWITCH (EXAMPLE)QUADRANT STAND, P10
G
SEE F
ENTRYEMERCARGO ACCESSDOORS DOORS DOORS DOORS a
a a a
CAPTF O L AOA R AOAAPLPITOT a PITOT a
a a
NOSE DN
STAB TRIM
L AUXR AUXTAT
CAUTION
PITOT a PITOT a
a LIGHT STABTRIM
MACHa
AUTO
SPOILERSSPD TRIM
SPDBRK a
a
a UNSCHED
RUDDERANTISKID
STAB TRIMRATIO
a
a
a
PILOTS' CONTROL COLUMNS
APL
NOSE UP
D
CONTROL COLUMNCONTROL COLUMNALTN
CUTOUT SWITCHESCUTOUT SWITCHESSTAB TRIM
UNSCHEDULED TRIM MACH SPD TRIM
(2 LOCATIONS) (2 LOCATIONS) CAUTION LIGHT CAUTION LIGHT
STAB TRIMANNUNCIATOR PANEL (P5)
APL
NOSE
DN
0
E
2
S
T
LCR
FREQ CRS FREQ CRS
4
A
WARNINGWARNING
ON
ON
30
6
B CAUTION CAUTION
DN
TAKEOFF RANGE
T
UP
8
(GREEN BAND)
I
R
10
M
12
TAT - 12C MASTER CAUTION ANDWARNING LIGHTS
MASTER CAUTION AND
O 1.65 CLB 1.65
WARNING LIGHTS
F14
1.28 1.28
NOSE
APL
F
WARNING
UP ANNUNCIATIONS EPR
STAB TRIM
MACH/SPD TRIM97.597.5
UNSCHD STAB TRIM
CONFIG N 1
327 327
STABILIZER POSITION INDICATOR EGT
F
EICAS DISPLAY UNIT
Stabilizer Trim Mach Speed Stability Flight Deck Components
Figure 3 (Sheet 2)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH ALTERNATE ú
22-22-00
STAB TRIM SWITCHES ú ú 04 Page 6 ú Jan 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A07636
A
757
MAINTENANCE MANUAL
(2)
Stab Trim Cutout Switches
(a) The cutout switches enable system hydraulic pressure to be removed from the Stabilizer Trim Control Modules (STCMs). Two guarded switches are on the aisle stand, one for the left and one for the right STCMs. In the ON position, 28 vdc battery bus power activates a motor-operated valve in the STCM that completes hydraulic pressure to the STCM solenoid valves. The CUT OUT position shuts off hydraulic pressure.
(3)
Stab Trim Control Switches
(a) The stab trim control switches enable the pilot or fist officer to input manual trim commands to both SAMs. Manual electric stabilizer trim control is provided by two single pole, three position, center off, thumb-operated rocker switches. The switches are on the outboard horn of each control wheel. Actuating both switches in the up direction issues simultaneous airplane nose up ARM and CONTROL commands. Down actuation issues airplane nose down ARM and CONTROL commands. When the trim switches are energized, both trim channels are activated and the stabilizer is driven at full-rate trim.
(4)
Control Column Cutout and Asymmetric Switches
(a) Each control column operates a set of four switches under the cabin floor, which allow electric trim commands to be interrupted by column action. The switches are wired in series with the SAMs arm command outputs. A column forward action greater than 4.0 degrees opens the switch in the airplane nose-up stabilizer trim command circuit. A column aft action greater than 2.7 degree opens a switch in the airplane nose-down stabilizer trim circuit. Two column asymmetric switches are wired in parallel with the column cutout switches. These switches provide an alternate path for trim commands when the control columns are operated asymmetrically after a system jam.
(5)
Failure Indicators
(a) When stabilizer movement of more than 0.3 degree occurs without a valid SAM output command in autopilot or mach/speed trim mode, the following indications are activated. 1) An owl aural warning sound and discrete amber UNSCHED STAB
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