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27-31-00
ALL ú ú 01 Page 108 ú Jul 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
speed) indicated air-above 250 knots lage. (Usually and forward fuse-vibration in aft Moderate vertical
____NOTE: for vibration. trouble shooting Fig. 201 for AMM 05-51-67, Refer to
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
27-31-00
ALL ú ú 01 Page 109 ú Nov 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
lage. (Usually speed)(Cont) indicated air-above 250 knots and forward fuse-vibration in aft Moderate vertical Refer to AMM 05-51-67, Fig. 201 for trouble shooting for vibration. NOTE:____
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
27-31-00
ALL ú ú 01 Page 110 ú Nov 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
speed)(Cont) Moderate vertical vibration in aft and forward fuse-above 250 knots indicated air-lage. (Usually
Refer to AMM 05-51-67, Fig. 201 for trouble shooting for vibration. NOTE:____
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
27-31-00
ALL ú ú 01 Page 111 ú Nov 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
on sure light comes hydraulic pres-differential input) reacts to column (airplane over-steering mode control wheel pitch control in Oversensitive Elevator feel clogged or leaking feel computer system B side of system A or in cable system Excessive friction computer bad incorrect Cable rig load Elevator feel Pitot line to high too low or too A or B pressure Hydraulic system filters clogged A or B return Hydraulic system (AMM 29-00-00/601). Troubleshooting. (Chapter 29). allowable leakage Refer to Chapter 29 for check for debris structure and do not contact pulley rims that cables clear all travel fwd or aft, check exceeds 4 pounds at mid-ing unit. If column force units and feel and center-quadrant to power control pushrods at elevator aft Disconnect lower end of hydraulic component. actuation of any light to come on by hydraulic pressure feel differential filters can cause system return Clogged hydraulic control system Check rig load on elevator Refer to Chapter 29, ____NOTE: Disassemble filter and required. 501). 401). and 501). cable (Chapter 29). Adjust as (AMM 27-31-00/ Rig cables (AMM 27-31-37/ (AMM 27-31-17/201 pitot lines feel computer Replace elevator Flush and test filter, as appli-Clean or replace
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
27-31-00
ALL ú ú 01 Page 112 ú Jul 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
Oversensitive pitch control in control wheel steering mode (airplane over-reacts to column input)(Cont) Interference at air pressure seals (pressure bulkhead, STA 1020) Foreign objects interfering with elevator system components Pulley binding on cable guard or bracket Fwd elevator quadrant binding or interfering with floor beam Fwd elevator quadrant bearings binding Pitch control wheel steering force transducer misrigged Sticky flexural pivot on force transducer in-stallation Aft quadrant support defective Disconnect system as above. With column force for interference at seals exceeded per above, check Disconnect system as above. per above, check for interference from foreign With column force exceeded objects Release tension in elevator control system cables. Check pulleys to see if they rotate freely. (Pay special attention to pulley installations at STA 1064) Release tension in elevator control system cables. In-spect for interference Release tension in elevator control system cables. Check for rough and binding bearings Check rigging procedure per 22-11-91, A/T Release tension in elevator control system cables. bearings Remove pivot from installa-binding tion and inspect for Check for rough or binding Replace air pres-sure seals and align cable thru seals and lubri-20-10-101) Locate and remove Rework to clear or replace Eliminate inter-Replace bearings Replace pivot if Replace bearings cate (Ref objects assembly ference Rerig binding
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