(1)
Spoiler switches on the overhead panel shut off hydraulic power to inboard and outboard flight spoilers. Ground spoilers are not affected by spoiler switches.
(2)
Spoiler shutoff valves are motor operated. Moving the switch will not move the valve unless electrical power is available at the valve.
(3)
Aileron trim system should be set at zero during any check of spoiler/speed brake system.
(4)
Ground spoiler operation depends on the control valve, operated by the speed brake lever, and the interlock valve, operated by extension of the right main gear shock strut inner cylinder. Be sure these two valves are in the position required for the check being made.
2. _________________________________________________Speed Brake Control System Trouble Shooting Chart
Excessive force required to rotate speed brake control lever Speed brake body cables binding or misaligned, fair-leads binding, brackets mis-aligned, or foreign object obstruction
Excessive cable tension
Speed brake lever brake mechanism defective or out of adjustment
Interference be-tween speed brake lever and control stand, between lever and thrust lever, or between lever latch and indicator plate Check cables for chafing or rubbing. Check for dirt or foreign objects
Check speed brake cable tension per 27-62-00, A/T
Check that lever brake primary backlash gaps are approximately equal. Operate lever and check that brake releases
Disconnect speed brake lower control rod at idler link. Operate lever and check for friction, galling, burrs, or inter-ference Repair or replace components as necessary
Adjust tension to specified values
Adjust or replace mechanism as nec-essary (27-62-21)
Replace or repair components as necessary
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
27-62-00
ALL ú ú 01 Page 101 ú Oct 25/85
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
operated. position. ailerons are detent and out of DOWN Speedbrake lever moves when it is Speedbrake lever UP or DOWN lever is moved to when control brake chatters (Cont) control lever rotate speedbrake required to Excessive force quadrant) Abnormal friction control valve in ground spoiler cable input mechanism Lever brake Speedbrake lever properly not lubricated brake mechanism slipping of the speedbrake restrict rotation mechanism (the changer no-back spoiler ratio changer, or or spoiler ratio in spoiler mixer Abnormal friction in speedbrake bearings lever brake forward drum and Abnormal friction no-back may handle forces. and check for excessive Operate speedbrake handle valve input lever. Disconnect spoiler mixer control rod at control aileron control wheel. Place speedbrake lever out of DOWN detent and move of cable tension. (AMM 27-61-21/401). speedbrake input quadrant. Disconnect speedbrake Remove spoiler mixer wheel well cables from body cables from forward Disconnect speedbrake forward drum in direction force applied by hand on and without a 50-100 pound drum. Operate lever with speedbrake system. you manually operate the Listen for chatter while friction. bearings for too much ratio changer, linkage or no-back mechanism, or the Examine the ratio changer Turn the input quadrant. (AMM 12-22-81/201. brake mechanism (AMM 27-62-41/401). (AMM 27-62-21/401). (AMM 27-61-31/401). (AMM 27-62-21/401). speedbrake lever Lubricate (AMM 27-62-21/401). Adjust or replace chatter continues, Repeat test. If mechanism as brake mechanism replace lever necessary Replace ground valve spoiler control changer or spoiler ratio (AMM 27-61-21/401) mixer Replace spoiler brake mechanism drum and lever Repair forward
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
27-62-00
ALL ú ú 01 Page 102 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
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