Service difficulty report · Proximity Sensor · Boeing 737824

Difficulty date
July 19, 2024
Submitted
July 22, 2024
Operation
Air carrier
Aircraft
N24212
Make and model
Boeing 737824
Aircraft serial
28772
Aircraft time
76,374 hours, 28,032 cycles
Part
Proximity Sensor
Part number
189929
Condition
Faulty
Location
#1 L/E Flap
Stage of operation
CL
How discovered
O
Nature of condition
J
Precautionary procedure
A

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

LEADING EDGE FLAPS TRANSIT LIGHT STAYS ON 2 CREW DEBRIEF - ON CLIMB ALT APPROX 19000 LE FLAP TRANSIT LIGHT(AMBER) & OVERHEAD LE FLAP 1 LIGHT ON WHILE FLAPS UP (CREW STATED CORRECTION ON FLAP1 NOT 2). BITE TEST FLAP/SLAT ELECTRONIC UNIT NO EXISTING FAULT. FAULT HISTORY LEG-0 FAULT F1 PROX EXTEND MSG 27-81217.(SEE ATTACHED PIC) FOUND TARGET FOR S168 TO BE BENT PER AMM 27-88-11-400-802,SENSOR CAN NOT BE ADJUSTED . KRUGER FLAP PART NUMBER IS 114A1110-5 TARGET P/N 114A1817-3 , BLOCK P/N 114A1816-7 .IPC REF 57-42-00-06 ITEMS 70,75. NO STOCK IN SFO AND NO ME FOR BOTH PARTS. REMOVED AND REPLACED #4 HINGE AND TARGET ASSEMBLY ON LEFT OUTBOARD LEADING EDGE FLAP IN REF TO AMM 27-81-11. STILL REQUIRES OPS CHECK.PARTS USED: 29-5742-3-0015,QTY :1 OPS CHECK FOR FREEDOM OF MOVEMENT GOOD. RETRACT SENSOR FOR #1 L/E FLAP DOES NOT CHANGE STATE. REPLACED SENSOR S169 REF AMM 27-88-11/401. ACCOMPLISHED SENSOR TEST REF AMM TASK 27-88-11-700-801. TEST GOOD. ALL INDICATION NORMAL.PARTS USED: 29-2762-3-0093,QTY :1 PARTS USED: 29-2762-3-0093,QTY :1 ACPD INSTALLATION INSP OF 4 HINGE AND TARGET ASSEMBLY ON LEFT OUTBOARD LEADING EDGE FLAP IN REF TO AMM 27-81-11. OPS CHK GOOD. STATEMENT ABOVE SHOULD READ EXTEND SENSOR S169. NOT RETRACT SENSOR. EXTEND SENSOR WAS BAD AND REPLACED.