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747-400 MAINTENANCE MANUAL S 435-028 (21) Install and lock the turnbuckles.
(22) Install the nose gear torsion link apex bolt (Fig. 503).
(a) Remove the holding tool from the torsion link.
(b) Place the upper torsion link end into the lower torsion link end fork.
(c) Lubricate the apex bolt shank and threads with grease.
(d) Insert the apex bolt and screw into the threaded bushing.
(e) Tighten the bolt hand tight and install the quick-release pin.
S 415-119 (23) Do this task: "Nose Landing Gear Door Operator Rods Connection" (AMM 32-00-30/201).
(24) Close the following circuit breakers on the P7 overhead circuit panel:
(a) 7G23 BODY GEAR STRG ARM AC
(b) 7G24 BODY GEAR STRG ARM DC
TASK 32-51-00-735-120 3. Nose Wheel Steering System Test_______________________________ A. General (1) This test is done to ensure proper operation of the nose wheel steering system. The test covers system clearance, system centering, steering rate, normal operation and towing provision.
(2) Before beginning the test, the nose gear electrical ground sensing mechanism and steering system must be properly adjusted.
(3) The nose wheel steering angle may be directly read on the aluminum foil marker on the forward steering collar.
(4) The table that follows contains port/label and bit information.
(a) This information is necessary when you do the system test for the steering system of the nose landing gear.
(b) Bit 19 below shows if one of the electrical interconnect actuators for the steering system does not operate correctly.
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32-51-00 ALL ú ú 01 Page 512 ú Feb 15/99 BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details. A 747-400 MAINTENANCE MANUAL
~.......................................................................... | BIT TABLE | ............................................................................ | | Bit Condition | ............................................................................ | Switch | Port/Label | Bit | 1 | 0 | ............................................................................ | PRI NG SNSR | E/070/270/00 | 21 | NG NOT | NG | | | | | COMPRESSED | COMPRESSED | ............................................................................ | ALT NG SNSR | E/070/272/00 | 21 | NG NOT | NG | | | | | COMPRESSED | COMPRESSED | ............................................................................ | PEDAL STRG ACT | C/026/010/10 | 19 | INOP | NORMAL | | MONITOR | | | | | 2................…...................…..........…............….............1 B. Special Tools and Equipment (1) 8ME65B01202-1 - Torsion Link Holding Tool
(2) A27092-84 - Actuator/Deactuator Set - Proximity Sensors
(3) G12001 - Rigging Pins G12001
Rigging Pin No._______________ Length (inches)_______________ Dash Number NS-5 4.00 15 NS-6 2.50 5 R-3 3.50 15
C. Standard Tools and Equipment (1) Stop watch
(2) Spring scale - 0 to 25 pounds
D. Consumable Materials
(1) D00633 Grease - BMS 3-33 (preferred)
(2) D00013 Grease - MIL-G-23827 (optional)
(1) AMM 09-11-00/201, Towing
(2) AMM 24-22-00/201, Manual Control
(3) AMM 27-21-00/501, Rudder and Rudder Trim Control System
(4) AMM 29-11-00/201, Main Hydraulic Supply System
(5) AIPC 32-21-03 Fig. 1, AIPC 32-51-60 Fig. 1, AIPC 32-51-61 Fig. 1, AIPC 32-51-63 Fig. 1
(1) Location Zone 221 Control Cabin, LH 222 Control Cabin, RH 715 Nose Landing Gear
G. Prepare for Test
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