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A07541
A

757
MAINTENANCE MANUAL

 (2)  
Main Equipment Center

 (a)  The main equipment center contains the following stabilizer trim system components. Two Stabilizer Trim and Elevator Asymmetry Limit Modules (SAMs) are in the left E3-1 and right E4-1 shelves, respectively. The left and right trim limit select relays are on the aft end of shelves E3-1 and E4-1. The SAM interfacing components in the main Elec/Elex equipment center are the Flight Control Computers (FCCs), Air Data Computers (ADCs), Flap Slat Electronic units (FSEUs), Flap/Slat Accessory Module (FSAM) (if installed), and the Stabilizer Position Modules (SPMs). The left, right, and center FCCs are in shelves E2-1, E2-2, and E2-3, respectively. The left and right ADCs are installed on shelves E2-1 and E2-2, respectively. The No. 1, 3 and 2 FSEUs are installed on shelves E5-1, E5-2 and E5-3, respectively. The FSAM (if installed) is on the E5-2 shelf in place of FSEU 3. The left, center, and right SPMs are installed in the card file of equipment rack P50.

 (3)  
Stabilizer Jackscrew Access Area

 (a)  The stabilizer jackscrew area behind the rear pressure bulkhead is accessible through the aft service access door (AMM 52-49-00/001, Exterior Service Doors). The area contains the Stabilizer Trim Actuator Assembly (STAA), the left and right Stabilizer Trim Control Modules (STCMs), and the left, center and right Stabilizer Trim Limit Switch and Position Transmitter Modules (STLMs). The STAA consists of two independent hydraulic motors and brakes coupled to a mechanical differential drive device.
 E. Stabilizer Trim Mach Speed Flight Deck Components (Fig. 3)
 (1)  Stab Trim Position Indicators
 (a)  
The control stand contains two linear indicators that display stabilizer trim position. One is driven by the left STLM. The other is driven by the right STLM.

 (b)  
The size of the indicator panel is 6.5 inches long and 1.5 inches wide. The weight is approximately 2 pounds. The indicator has a vertical scale that displays stabilizer position. The scale reads from 0 units to 16 units. A 0 units indication represents a +4 degree, stabilizer leading edge up (airplane nose down) condition. A 15.5 unit reading represents a -11.5 degree, stabilizer leading edge down (airplane nose up) condition. A green band on each side of the scale (2 to 7 units) indicates the allowable takeoff range. When the system is off, a black and amber striped area is in view at the bottom of the scale.

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A
757
MAINTENANCE MANUAL

STAB TRIM SEE C
MANUAL TRIM LEVERS (CAPTAIN'S) (FIRST OFFICER'S)
CONTROL SWITCH

STABILIZER TRIMSEE A
STABILIZER TRIM
SEE B
CONTROL SWITCH (EXAMPLE)
C QUADRANT STAND (P10)
SEE B
ENTRY EMER CARGO
ACCESS DOORS
DOORS DOORS DOORS a
a a a
CAPT F O L AOA R AOA PITOT a PITOT a
aa
L AUX R AUX TAT PITOT a PITOT a
a
STAB TRIM
NORM

MACHCAUTION
STABAUTO
SPOILERSSPD TRIM
TRIM SPDBRK a
a a a
LIGHT
UNSCHED
RUDDER STAB TRIM
ANTISKIDRATIO
a
a
CUT  PILOTS' CONTROL COLUMNS
a
OUT
CONTROL COLUMN  CONTROL COLUMN
CUTOUT SWITCHES  CUTOUT SWITCHES
CR
(2 LOCATIONS) (2 LOCATIONS)
STAB TRIM

UNSCHEDULED TRIMMACH SPD TRIM
STAB TRIM
CAUTION LIGHT  CAUTION LIGHT
A
APL ANNUNCIATOR PANEL (P5)
NOSE
DN

0
TAKEOFF RANGE
2
S
(GREEN BAND)
LCR
T
FREQ CRS FREQCRS
4
A  WARNING WARNING
ON
ON
30
6
B
CAUTION CAUTION
DN
T  UP
8
R
I

10
M
12  TAT - 12C
MASTER CAUTION AND 1.65 CLB 1.65MASTER CAUTION AND
O
WARNING LIGHTS WARNING LIGHTS
1.281.28
F 14
APL
F  WARNING
NOSE
EPR
ANNUNCIATIONS
UP  STAB TRIM
MACH/SPD TRIM 97.5 97.5
UNSCHD STAB TRIM
CONFIG

N 1
327 327
STABILIZER POSITION INDICATOR EGT
　
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