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A 737-300/400/500MAINTENANCE MANUAL FLAP LIMIT SWITCHES - ADJUSTMENT/TEST _____________________________________ 1. General_______ A. There are two tasks in this procedure. There is an adjustment and a functional test of the flap limit switches. The limit switches included in these tasks are the FLAPS UP and the FLAPS DOWN switches. These two switches and five other flap position switches are installed on the forward part of the flap control unit. TASK 27-51-87-825-001 2. Flap Limit Switch Adjustment____________________________ A. Special Tools and Equipment (1) Ohmmeter
(2) Wrench Set - F80197-5
(1) 24-22-00/201, Manual Control
(2) 27-51-00/201, Trailing Edge Flap System
(3) 27-51-32/401, Inboard Flap Track Fairing
(1) Location Zone 101, 102 Control Cabin 217 Right Main Wheel Well
D. Prepare for the Adjustment
S 865-002 (1) Do this task: "Supply Electrical Power" (Ref 24-22-00/201).
(2) Do this task: "Hydraulic System B Pressurization" (Ref 27-51-00/201).
(3) If the flaps are extended, put the flap control lever in the UP detent to retract the flaps.
(4) Stop for 2 minutes with hydraulic system B pressurized and the flap control lever in the UP detent.
NOTE:____The flap power unit can move during this time. The movement will be small, and will be different on different airplanes. EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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737-300/400/500MAINTENANCE MANUAL (5) S 865-006Do this task: "Hydraulic System B Depressurization" (Ref 27-51-00/201). (6) S 015-007Do this task: "Inboard Flap Track Fairing Removal" (Ref 27-51-32/401). NOTE:____ You can remove the No. 4 or the No. 5 flap track fairing. The procedure refers to the No. 4 fairing and ballscrew. You can use the No. 4 or the No. 5 ballscrew to do the adjustment. (7) S 225-008Measure the Dimension X at the No. 4 ball screw (Fig. 502). (a) Write down this dimension as X1.
SEE A FLAPS 10-DEGREE SWITCH, S584 RETAINING NUTS PIN ROLLER GUIDE (EXAMPLE) FLAPS UP SWITCH, S245
STALL WARNING SWITCH, S856 INBD B SWITCH COVER BSEE UNIT CONTROL FLAP SWITCH, S290 MACH TRIM SWITCH, S138 LANDING WARNING FWD INBD A SWITCH, S130 TAKEOFF WARNING SWITCH, S246 FLAPS DOWN Flap Flap Control Unit Figure 501
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737-300/400/500 MAINTENANCE MANUAL
SEE A FLAP TRANSMISSION ASSEMBLY UPSTOP DOWNSTOP DOWNSTOP BALLSCREW NUT BALLSCREW SCREW YOKE UPSTOP BSEE A FWD (SCREW YOKE) UPSTOP UPSTOP (BALL NUT) DIMENSION "X" B Ballscrew Figure 502
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27-51-87 ALL ú ú 01 Page 503 ú Mar 15/91 BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details. A 737-300/400/500MAINTENANCE MANUAL S 015-009 (8) Remove the switch cover from the flap control unit (Fig. 501).
S 865-010 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：737-300 400 500 AMM 飞机维护手册 飞行操纵 FLIGHT CONTROLS 5
