Horizontal Stabilizer Trim Control System - Troubleshooting Chart Figure 101 (Sheet 2)
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A 737-300/400/500MAINTENANCE MANUAL
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A 737-300/400/500MAINTENANCE MANUAL
TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
only. with low speed Stabilizer moves flight. position in will not hold Stabilizer trim tions manually. and in both direc-only electrically in one direction Stabilizer moves Bad flap up relay screw assembly gearbox and jack-Bad jackscrew control relay Bad safety or circuit Bad electric Bad limit switch PSTA tic clutches in Bad electromagne- is bad. terminal, X1, flap relay is present at relay coil for continuity. If 28V DC Check flap up relay circuit bad. and jackscrew assembly are properly, jackscrew gearbox If brake is working Check auxiliary brake. bad. relay or control relay is checks out, safety relay. If continuity through light and safety circuit for continuity Check control switches and clutch. and at electromagnetic applicable limit switch Check for continuity at limit switch is bad. If voltage is present, switch for continuity. Check applicable limit PSTA is bad. If voltage is present, electromagnetic clutch. Check for voltage at PSTA relay. replace flap up as required or Repair circuit gearbox and jack-screw assembly. Replace jackscrew relay. safety or control circuit or replace Repair applicable required. circuit as Repair applicable switch. Replace limit 401). (AMM 27-41-71/ Replace PSTA
Horizontal Stabilizer Trim Control System - Troubleshooting Chart Figure 101 (Sheet 3)
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L86334
A 737-300/400/500MAINTENANCE MANUAL
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EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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ALL ú ú 00 Page 106 ú Mar 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
down). turns (flaps more than 2.5 wheel coasts Stabilizer trim tion only. nose down direc-inoperative in Stabilizer only. in one direction Stabilizer moves PSTA tic clutches in Bad electromagne-switch Bad trim control roded jackscrew Rusty and/or cor- present, the PSTA is bad. clutches. If 28V DC is for 28V DC at PSTA check for continuity and With autopilot engaged, the PSTA is bad. there is no continuity, magnetic clutches. If for 28V DC at electro-Check for continuity and is bad. continuity, switch assembly tinuity. If there is no Switch). Check for con-Stabilizer Trim Control (AMM 27-41-11/401, Remove switch assembly Disconnect trim control Check visually. Replace the PSTA (AMM 27-41-71/ Replace the PSTA 401). (AMM 27-41-91/ assembly control switch Replace trim Servicing). (Ref Chapter 12, jackscrew Lubricate 401). (AMM 27-41-71/ 401).
procedures. normal rig flight following checks low after sion repeatedly Control cable ten- tion tension relaxa-Excessive cable requires re-rigging. chart, cable is worn, or listed in cable tension 15 pounds below value repeatedly more than If cable rig load is sion (AMM 27-41-00/501). Check control cable ten- 501). (AMM 27-41-00/ tension chart listed in cable twice rig load rig load to 1. Increase cable cable as follows: Re-rig control
Horizontal Stabilizer Trim Control System - Troubleshooting Chart Figure 101 (Sheet 4) 中國航空網 www.k6050.com 航空翻譯 www.aviation.cn 本文鏈接地址：737-300 400 500 AMM 飛機維護手冊 飛行操縱 FLIGHT CONTROLS 3(73)
