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27-51-00
ALL ú ú 01 Page 107 ú Nov 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
operation Slow or fast flap tion Slow flap opera-not electrically hydraulically but Flaps operate ority valve Defective pri-tion (Position 1) assembly or transmission Binding gearbox No ac power switches alternate flap No dc power at limit switch Defective flap in normal posi-Flap bypass valve unit alternate drive Defective flap (Ref 27-51-84, R/I) Shooting normal operating time Check trailing edge flaps flap transmission and check for free rotation each side of gearbox or Disconnect torque tubes on Electrical Power - Trouble Refer to Chapter 24, for continuity through circuit breakers nate flaps switches Check circuit from alter-through flap limit switch Check circuit continuity sent, valve is defective valve. If power is pre-for power at flap bypass With switch at ARM, check master switch is at ARM. and that alternate flap circuit breaker is closed Check that FLAP VALVES unit is defective power is present, drive alternate drive unit. If Check for power at flap (Ref 27-51-87, 27-51-84, R/I) 27-51-82, R/I) 27-51-59, R/I) valve (Ref Replace priority Shooting Chart) this Trouble electrically (in hydraulically or not operate See flaps will breaker switch or circuit replace defective Repair wiring or R/I) limit switch Replace flap valve (Ref Replace bypass unit (Ref alternate drive Replace flap
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
27-51-00
ALL ú ú 01 Page 108 ú Nov 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
Loose control Low cable tension Check cable tension per Adjust cable
cables Broken control cable AMM 27-51-00/501 Check cable run for broken cable tension Replace broken cable
Flap position Flap position Check that trailing edge Rerig flap posi-
indicator indicator system flap position indicating tion indicating
pointers stop out of rig system is in adjustment system
between 15 and 25 (AMM 27-58-01/
units, when 25 501)
units of flaps is selected, but continue toward 40 units when 40 units is selected cator position indi-Faulty flap Both flap position indi-cator pointers do not indicate selected units 401) (AMM 27-58-41/ Replace flap posi-tion indicator
Faulty flap position trans-mitter One flap position indi-cator pointer does not indicate selected units of flap position 401) (AMM 27-58-12/ mitter Replace flap position trans-
Flap position Faulty flap Perform flap asymmetry Replace flap
indicator position indi- shutoff test position indi-
pointers left and cator (AMM 27-51-00/501) cator
right are split and at the same time the primary flap drive system continues to relay, R123 Faulty flap asymmetry shutoff relay, R123 asymmetry shutoff Replace flap 401) (AMM 27-58-41/
operate.
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27-51-00
ALL ú ú 02 Page 109 ú Jul 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
Flaps do not Flap load relief Reset circuit
retract auto- circuit breaker breaker on panel
matically from open P6
light (not on FLAP LOAD RELIEF 162 knots and exceeds 152 to when airspeed 40- to 30-units supply PC board) receiver or power ARINC 429 Faulty airspeed switches (or on Check that test light comes LOAD LIMITER TEST light. Verify squat switch is operating. Press-to-test Replace squat switch
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