(2)
The operational test of the stabilizer trim limit switches with the landing gear retraction simulated.
(3)
The operational test of the stabilizer trim limit switches with the landing gear extended.
B.
To do a test for the outer limits of the main electric limit switches, refer to AMM 22-10-00/501.
C.
The adjustment of the limit switches must be completed during the switch installation.
TASK 27-41-08-715-001
2. Operational Test - Stabilizer Trim Limit Switch_______________________________________________
A. References
(1)
AMM 06-09-05/201, Body Section 48 Access Doors and Panels
(2)
AMM 24-22-00/201, Manual Control
(3)
AMM 27-81-00/201, Leading Edge Flap System
(4)
AMM 29-11-00/201, Main Hydraulic Supply System
(5)
AMM 31-61-00/201, Integrated Display System
(6)
AMM 32-09-02/201, Air/Ground Relay System
B.
Access
(1)
Location Zone
311 Area Aft of Pressure Bulkhead, LH
312 Area Aft of Pressure Bulkhead, RH
(2)
Access Panel 312A Horizontal Stabilizer Jackscrew Access Door
C.
Prepare for the Test
(1)
Open the access door 312A (AMM 06-09-05/201).
(2)
Supply electrical power (AMM 24-22-00/201).
S 015-002
S 865-003
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A
747-400 MAINTENANCE MANUAL
S 865-004
(3)
Make sure the EICAS is in operation (AMM 31-61-00/201).
S 865-001
(4)
Make sure you retract the leading edge flaps (AMM 27-81-00/201).
S 865-005
(5)
Pressurize the hydraulic systems No. 2 and 3 (AMM 29-11-00/201).
S 865-006
(6)
Set the STAB TRIM 2 and 3 switches on the control stand to ON.
D.
Do a Test of the Limit Switches
S 865-011
WARNING: YOU MUST CAREFULLY FOLLOW THE STEPS IN THE TASK BELOW TO
_______ PREPARE THE SAFETY SENSITIVE SYSTEMS FOR THE AIR MODE. FAILURE TO FOLLOW THE STEPS CORRECTLY CAN CAUSE THE AUTOMATIC OPERATION OF THE AIRPLANE SYSTEMS. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
(1)
Do the "Prepare Safety-Sensitive Systems for Air Mode Simulation" task (AMM 32-09-02/201).
S 865-010
(2)
Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a)
P7, Overhead Circuit Breaker Panel
1) 7F22, LANDING GEAR DSP & CONT PRI
2) 7F23, LANDING GEAR DSP & CONT ALTN
S 715-002
(3)
Do a test of the main electric limit switches on the left side with the landing gear retraction simulated:
(a)
Set the STAB TRIM 2 switch on the control stand to CUTOUT.
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A
747-400 MAINTENANCE MANUAL
(b)
Use the STAB TRIM switches on the captain's control wheel to move the stabilizer to 7-8 units of trim.
(c)
Hold the STAB TRIM switches on the captain's control wheel to the NOSE UP until the stabilizer stops.
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本文链接地址：747-400 AMM 飞机维护手册 飞行操纵 FLIGHT CONTROLS 3(191)
