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A

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MAINTENANCE MANUAL

SEE  A 
SEE  B  STABILIZER HORIZONTAL 
UPPER GIMBAL  JACKSCREW STABILIZER HORIZONTAL 
B BRAKES HYDRAULIC  AFT  MECHANISM TRIM DRIVE GIMBAL LOWER SWITCHES LIMIT TRIM STABILIZER 
STABILIZER TRIM CONTROL MODULES  HYDRAULIC MOTOR 
A 
B 
Figure 501 (Sheet 1) Stabilizer Trim Control System Test 

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MAINTENANCE MANUAL

AIRPLANE NOSE DOWN 0 UNITS

AIRPLANE NOSE UP
STABILIZER TRIM UNITS

MANUAL - ALTERNATE ELECTRIC NOTE:TOLERANCE ON INDICATED MAX OPERATIONAL LIMIT SETTING IS |1/4 UNIT
MAIN ELECTRIC - LANDING ONE UNIT OF STABILIZER TRIM IS GEAR DOWN, LE FLAPS DOWN, EQUIVALENT TO 1 DEGREE OF OR SPEED TRIM MODE - MAX STABILIZER ANGLE. STABILIZER OPERATIONAL LIMIT ANGLE IS MEASURED FROM A
REFERENCE NEUTRAL POSITIONMAIN ELECTRIC - LANDING WHICH CORRESPONDS TO 3 UNITSGEAR UP, LE FLAPS UP, AND OF STABILIZER TRIM. THEREFORE,NOT SPEED TRIM MODE - MAX 0 UNITS OF TRIM EQUALS +3 DEGREES;OPERATIONAL LIMIT
15 UNITS OF TRIM EQUALS -12 DEGREES. MAIN ELECTRIC -

MAX OPERATIONAL LIMIT
MAIN ELECTRIC -AUTO PILOT INPUT -MAX OPERATIONAL LIMIT
HORIZONTAL TAILFUELING LIMIT
Stabilizer Trim Control System Test Figure 501 (Sheet 2)
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A
747-400
MAINTENANCE MANUAL

AIRPLANE NOSE DOWN 0 UNITS
AIRPLANE NOSE UP
STABILIZER TRIM UNITS
MANUAL - ALTERNATE ELECTRIC NOTE:TOLERANCE ON INDICATED MAX OPERATIONAL LIMIT SETTING IS |1/4 UNIT
MAIN ELECTRIC - LANDING ONE UNIT OF STABILIZER TRIM IS GEAR DOWN, OR LE FLAPS DOWN, EQUIVALENT TO 1 DEGREE OF OR SPEED TRIM MODE - MAX STABILIZER ANGLE. STABILIZER OPERATIONAL LIMIT ANGLE IS MEASURED FROM A
REFERENCE NEUTRAL POSITIONMAIN ELECTRIC - LANDING WHICH CORRESPONDS TO 3 UNITSGEAR UP, LE FLAPS UP, AND OF STABILIZER TRIM. THEREFORE,NOT SPEED TRIM MODE - MAX 0 UNITS OF TRIM EQUALS +3 DEGREES;OPERATIONAL LIMIT
15 UNITS OF TRIM EQUALS -12 DEGREES. MAIN ELECTRIC -MAX OPERATIONAL LIMIT
MAIN ELECTRIC -AUTO PILOT INPUT -MAX OPERATIONAL LIMIT
HORIZONTAL TAILFUELING LIMIT
Stabilizer Trim Control System Test
Figure 501 (Sheet 3)

E55852
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MAINTENANCE MANUAL

CONTROL COLUMN WITH INBOARD ELEVATOR 4MIT65B80307-1 OR BUBBLE PROTRACTOR 1` UP NEUTRAL RIG POSITION COLUMNF52485-500 (ALSO USED AFTON CAPTAIN'S COLUMN)
COLUMN
STOP
FORWARD
POSITION
STOP POSITION
12`40' |1.0`
12`30' |1.0`
8`17' |1.0`
1. FIRST OFFICER'S
COLUMN

CONTROL COLUMN PROTRACTOR ADAPTER 3MIT65B80307-1 (ALSO USED ON CAPTAIN'S COLUMN) CONTROL COLUMN
DUST COVER FWD
90`
CABIN FLOOR
CONTROL COLUMN
ELEVATOR CRANK BUBBLE PROTRACTORPROTRACTOR 4MIT65B80307-1ADAPTER OR F52485-500MIT65B80326-6 (ALSO USED ON(ALSO USED ON CAPTAIN'S COLUMN)CAPTAIN'S COLUMN)
Stabilizer Trim Control System Test
Figure 501 (Sheet 4)

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