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1. Provide electrical power (AMM 24-22-00/201).
2. Provide right and center hydraulic systems power (AMM 29-11-00/201).
WARNING: KEEP ALL PERSONNEL AND EQUIPMENT CLEAR OF CONTROL SURFACES, CABLES, AND LANDING GEAR AREAS. PRESSURIZATION OF A HYDRAULIC SYSTEM CAN MOVE CONTROL SURFACES,CABLES, LANDING GEAR, AND LANDING GEAR DOORS. MOVEMENT OF CONTROL SURFACES, CABLES, LANDING GEAR, AND LANDING GEAR DOORS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
3. Check that only one horizontal stabilizer primary trim channel is inoperative and that horizontal stabilizer trim operates normally by the manual trim levers (or alternate electrical trim switches).
A. Check that the STAB TRIM SHUTOFF-R and STAB TRIM SHUTOFF-L circuit breakers (P11) are closed.
B. Check that the STAB TRIM CONT-L circuit breaker (P11) is closed.
C. Check that the stabilizer is positioned between 6 and 12 units of trim.
D. Check that the R and C FLT CONTROL SHUTOFF switches on the right side panel (P61) are ON.
E. Place the R STAB TRIM Cutout Switch on control stand to NORM. Place the C STAB TRIM Cutout Switch to CUTOUT. The right trim channel is now isolated.
1) Move either the captain's or first officer's stabilizer trim control wheel switches up and then down. If the stabilizer does not move in BOTH directions, the right primary trim channel is inoperative (M212).
2) Move both stabilizer manual trim levers (or alternate electrical trim switches) on control stand in both the airplane nose up and airplane nose down directions, and verify that the stabilizer moves in both directions.
F. Place the R STAB TRIM Cutout Switch to CUTOUT. Place the C STAB TRIM Cutout Switch to NORM. The left trim channel is now isolated.
1) Move either the captain's or first officer's stabilizer trim control wheel switches up and then down. If the stabilizer does not move in BOTH directions, the left primary trim channel is inoperative (M211).
2) Move both stabilizer manual trim levers (or alternate electrical trim switches) on control stand in both the airplane nose up and airplane nose down directions, and verify that the stabilizer moves in both directions.
NOTE: ONE PRIMARY TRIM CHANNEL (LEFT OR RIGHT) MUST BE OPERATIVE IN ORDER TO DISPATCH.
NOTE: HORIZONTAL STABILIZER TRIM MUST OPERATE WITH THE STABILIZER TRIM LEVERS (ALTERNATE STABILIZER TRIM SWITCHES) IN ORDER TO DISPATCH.
4. Check that no arm or control valve is failed in the energized position.
A. Check that the stabilizer is positioned between 6 and 12 units of trim.
B. Place the R STAB TRIM Cutout Switch to NORM. Verify that the C STAB TRIM Cutout Switch is also in the NORM position.
C. Move the left stabilizer manual trim lever (or alternate electrical trim switch) on the control stand in both the airplane nose up and airplane nose down directions. Verify that the stabilizer does not move. If the stabilizer does move, an arm or control valve is failed in the energized position and dispatch is not allowed until repairs are made.
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757 最低设备清单 Minimum Equipment List (MEL) 2(2)
