(2)
Install rigging pins in quadrant (27) and in steering wheel.
(3)
Remove aft access panel from left nose wheel well bulkhead to gain access to nose wheel steering (NWSA, NWSB) turnbuckles (40, 43).
(4)
Ensure right and left cable guards are 0.015 to 0.045 inch from steering collar pulley. Adjust if necessary (Ref 32-51-51 R/I).
(5)
Loosen turnbuckles (40, 43).
C. Remove Steering System Cables (Fig. 401)
(1)
Disconnect nose wheel steering cables (view 1).
(2)
Remove lockwire (19) from spring pins (21) at NWSA and NWSB cable terminal ends which lie in groove in the steering collar (18).
(3)
Remove spring pins (21).
(4)
Remove NWSA and NWSB cable terminals from groove in steering collar (18).
(5)
Remove left trunnion pin nut (7) using spanner wrench (detail A).
(6)
Pull pressure seal (14) inboard from inboard end on left trunnion pin (8).
(7)
Remove ring (17) and eyebolt (16) to remove pressure seal retainers (13, 15) from pressure seal segments and separate segments from around steering cables.
(8)
Pull cables through left trunnion pin (8).
(9)
Remove NWSA, NWSB cable guards (22, 23) outside of wheel well left bulkhead, so cables can be pulled through pulley bracket.
(10)
Pull cables NWSA(G), NWSB(H) through nut (7), ring (17) trunnion pin.
(11)
Remove cable end fittings on upper plate.
(12)
Remove cable guard (28) on quadrant (27) and remove cables.
(13)
Remove steering cables NWSA(A), NWSB(H) from steering wheel.
520
32-51-31 Page 406 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Jun 20/85
D. Install Steering System Cables (NWSA, NWSB)
(1)
String replacement cables through fairleads.
NOTE: For cable length and fittings see chart on Fig. 402. For general cable installation information, refer to control cables Chapter 27.
(2)
Connect nose wheel steering system cables (NWSA, NWSB).
(3)
Feed steering cables NWSA(K), NWSB(1) through left trunnion pin, each half pressure seal retainer ring (13, 15), inboard left trunnion pin nut (8), and through their respective cable pulley brackets to steering collar (18).
(4)
Install cable guards which were removed when cables were disconnected.
(5)
Insert steering cable terminal for NWSA(K), NWSB(1) in either recess groove on aft side of steering collar (18) (view 1).
(6)
Install spring pins (21) in holes provided in steering collar (18).
(7)
Lockwire spring pins.
(8)
Install cable end fittings on upper plate.
(9)
Install cables on quadrant (27).
(10)
Install cables on steering wheel.
(11)
Connect cables to their respective turnbuckles, (40, 43) and adjust nose wheel steering system, per Nose Wheel Steering System - Adjustment/Test, 32-51-0.
(12)
Install locking clips in turnbuckles.
520
Nov 15/80 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 32-51-31 Page 407
Steering System Cables 521
32-51-31 Figure 402 Jun 20/90
Page 408
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
STEERING CABLES - INSPECTION/CHECK
1. Steering Cables Inspection
A. Examine Steering Cables
(1)
Check steering cables for fraying and corrosion.
(2)
Examine cable seals for deterioration, out-of-round wear, and insecurity of mounting rings.
(3)
Check pulley brackets for cracks, distortion and loose mounting bolts.
(4)
Check pulleys and fairleads for cracks, looseness and misalignment.
(5)
Check cables for specified rigging.
(6)
Examine steering cables for wear per figure 601.
NOTE: Cable wear conditions are illustrated in section 27-09-111.
CABLE CABLE SIZE ALLOWABLE PERCENT WEAR OF OUTER WIRES BEFORE REPLACEMENT
STEERING CABLES NWSA, NWSB, NGPPA AND NBPPB 3/32 7x7 50
NOTE: Do not mix tin-zinc (TZ) covered cables with other type cables on the same airplane because TZ cables have a different stretch rate than other cables.
500 Steering Cable Wear Limits
Jun 20/90 Figure 601 32-51-31
Page 601
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
本文链接地址：737 AMM 飞机维护手册 起落架 LANDING GEAR(177)
