S 864-037

 (6)  
Remove electrical power if it is not necessary (Ref 24-22-00).

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH STAB TRIM LEVERS ON THE ú

 27-41-02
 CONTROL STAND  ú ú 02 Page 407 ú Dec 20/90
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757 MAINTENANCE MANUAL
 ALTERNATE STABILIZER TRIM SWITCH - REMOVAL/INSTALLATION
_______________________________________________________
 1.  General_______
 A.  This procedure contains steps to remove and install the alternate stabilizer trim switches.
 TASK 27-41-03-024-001
 2.  Remove the Alternate Stabilizer Trim Switch___________________________________________
 A.  References
 (1)  
24-22-00/201, Electrical Power - Control

 (2)  
29-11-00/201, Main (Left, Right, and Center) Hydraulic Systems

 B.  
Access

 (1)  
Location Zones
 211/212 Control Cabin

 C.  
Prepare for the Removal

 S 864-002
 (1)  
Remove the pressure from the right and center hydraulic systems (Ref 29-11-00).

 S 864-003

 (2)  
Put the RIGHT and CENTER STAB TRIM SHUTOFF valve switches on the control stand panel, P10, to the CUTOFF position.

 S 864-004

 (3)  
Open these circuit breakers on the overhead panel, P11, and attach DO-NOT-CLOSE tags:

 (a)  
11B19, STAB TRIM ALT

 (b)  
11C12, STAB TRIM SHUTOFF LEFT

 (c)  
11C13, STAB TRIM SHUTOFF RIGHT

 (d)  
11H11 or 11C05, STAB TRIM CONT LEFT

 (e)  
11H20, STAB TRIM CONT RIGHT

 D.  
Remove the Alternate Stabilizer Trim Switch

 S 014-005
 (1)  
Remove the left seal assembly for access to the speed brake lever and the alternate stabilizer trim switch.

 (2)
Remove the access panel on the left side of the control stand.

 (3)
Remove the screws that hold the clamps to the control stand.

 S 014-006
 S 034-007
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH ALTERNATE STAB TRIM ú

 27-41-03
 SWITCHES ON THE CONTROL STAND  ú ú 01 Page 401 ú Mar 20/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757
MAINTENANCE MANUAL

ALTERNATE
SCREW
STABILIZER
WASHER
TRIM SWITCHES
(2 LOCATIONS)
SCREW WASHERCONTROL STAND NUTPANEL, P10
CLAMP SEE B (2 LOCATIONS)
ELECTRICAL
CONNECTORS SIDE VIEW OF CONTROL STAND
SEE A SIDE VIEW OF CONTROL STAND (ACCESS PANEL REMOVED)
A
LEFT SEAL ASSEMBLY
ADI ADI
FLAP
DH REF DH REFBRT BRT
RST RST
RANGE  HSI  BRT  RANGE  HSI  BRT 
160 320 80  160 320 80 
40  EXP  40  EXP 
20  ILSVOR  WXR  20  ILSVOR  WXR 
10  VOR  MAP  10  VOR  MAP 
FULL ILS  ON  FULL ILS  ON 
PLAN  w  APL  PLAN  w 
MAP  NOSE DN  MAP 
NAV AID  ARPT RTE DATA WPT  NAV AID  ARPT RTE DATA WPT 
ON  ON  ON  ON  ON  ON  ON  ON 
w  w  w  w  w  w  w  w  w  w 

APL NOSE UP
ALTN
STAB TRIM PARK
ENG ENG
VALVE
VALVE a
APL
APL NOSE
a REV aBRAKE 0 NOSE
0 DN
ISLN
SPAR a SPAR DNVALVE VALVE
aa2 2
SP
S
ALTERNATE
A
T T
4 4 L FUEL CONTROL RR
A A
STABILIZER
6 6K
B B
RUN
8 8
TRIM SWITCHES
T T
B
R R
R 10
10 A
CUT OFF
I I
NORM12
12 E
K
M M
O
O APL APL
F 14
F 14 NOSE NOSE
F
F UP UP
CUT
OUTPULL
ONLY
LC
STAB TRIM
　
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