S 432-060
(9)
Install the upper and the lower stabilizer-to-body seal fairing.
S 432-061
(10)
If it is applicable, install the support brackets and connect the hydraulic lines on the rear spar.
S 862-020
(11)
Do this task: "Remove Electrical Power" (AMM 24-22-00/201).
S 862-021
(12)
Set all FLT CONTROL HYD POWER TAIL switches on the P461 Pilots' Overhead Maintenance Panel in NORM.
S 862-022
(13)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:
(a)
P180, DC Power Distribution Panel
1) 180E7, ELEV/RUD VLV SYS 2
2) 180E22, ELEV/RUD VLV SYS 4
3) 180H8, ELEV/RUD VLV SYS 1
4) 180H23, ELEV/RUD VLV SYS 3
(14)
Set the STAB TRIM 2 and 3 switches to ON.
S 862-024
(15)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:
(a)
P7, Overhead Circuit Breaker Panel
1) 7E7, L STAB TRIM S/O VLV
S 862-023
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2) 7E20, R STAB TRIM S/O VLV
TASK 27-41-02-712-062
7. Operational Test - Stabilizer Hinge___________________________________
A. References
(1)
AMM 24-22-00/201, Manual Control
(2)
AMM 29-11-00/201, Main Hydraulic Supply System
B.
Access
(1)
Location Zone 311 Area Aft of Pressure Bulkhead, LH 312 Area Aft of Pressure Bulkhead, RH 315 Area Aft of Stabilizer Box Compartment, LH 316 Area Aft of Stabilizer Box Compartment, RH
(2)
Access Panel
315A Access Door
C.
Procedure
S 862-064
(1)
If you disconnected the hydraulic lines, do this task to pressurize the hydraulic systems No. 1, 2, 3 and 4: "Supply Hydraulic Power" (AMM 29-11-00/201).
S 862-060
(2)
If you did not disconnect the hydraulic lines, do this task to pressurize the hydraulic systems No. 2 and No. 3: "Supply Hydraulic Power" (AMM 29-11-00/201).
(3)
Do this task: "Supply Electrical Power" (AMM 24-22-00/201).
S 862-068
S 712-025
WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE
_______ HORIZONTAL STABILIZER AND THE ELEVATOR CONTROL SURFACES BEFORE YOU MOVE THE STABILIZER. THE STABILIZER CAN MOVE QUICKLY AND CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
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747-400
MAINTENANCE MANUAL
(4) Use the STAB TRIM switches on the control wheel to examine the movement of the stabilizer:
(a) (b) (c) (d) Make sure the stabilizer starts, moves and stops smoothly.Make sure the stabilizer hinges move freely.Make sure the stabilizer hinges do not touch the stabilizer-to-body seals, the seal fairings and the seal doors.When you move the stabilizer from the 2 to the 5 units of trim, make sure the surfaces of the stabilizer are sealed to the
(e) fuselage.Make sure that one of the two surfaces of the stabilizer is sealed to the fuselage when you move the stabilizer more than 5 units of trim.
S 712-075
(5) If you disconnected the hydraulic lines, do these steps five times:
(a) Hold the STAB TRIM switches on the control wheel to NOSE UP. 1) Make sure the stabilizer position indicators on the control stand move to APL NOSE UP.
(b) 2) Release the STAB TRIM switches.Hold the STAB TRIM switches on the control wheel to NOSE DN. 1) Make sure the stabilizer position indicators move to APL NOSE DN.
2) Release the STAB TRIM switches.
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