# JASC 2751: Trailing Flap Position Indicating System

- Type: JASC system/component code (FAA)
- ATA chapter: 27 Flight Controls
- Title in the code table: TE FLAP POSITION IND. SYSTEM
- Service difficulty reports: 3,079
- FAA code table: https://www.faa.gov/sites/faa.gov/files/JASC_Code.pdf#page=26
- Page: https://openairdocs.org/jasc/2751

## What it covers

The system components and parts that sense, transmit and indicate trailing edge flap position relative to the wing surface. Typical parts are indicator, transmitter, position module, asymmetry switch, and comparator, etc.

## Service difficulty reports (3,079, newest 50)

- [SDR CALA2026102320535](https://openairdocs.org/sdr/CALA2026102320535), Oct 21, 2026: Boeing 737724. WARNING LIGHT. FALSE ACTIVATION. LE TRANSIT LIGHT ON WITH FLAPS 5. LT OTBD AMBER LIGHT ON OVERHEAD INDICATOR CREW DEBRIEFED FLAP TRANSIT LIGHT STAYED ON  (N15712)
- [SDR CALA2026101520401](https://openairdocs.org/sdr/CALA2026101520401), Oct 13, 2026: Boeing 7379. TRANSMITTER. FAULTED. T/E FLAPS INDICATION FOR LT & RT FLAPS DO NOT AGREE, TE FLAP ASSYM, FLAPS SPLIT AT 5 DETENT, MX MSG 27-52261, 27-52259,  (N77578)
- [SDR 2026F00224](https://openairdocs.org/sdr/2026F00224), Oct 7, 2026: Boeing 7377Q8. TRANSMITTER. INOPERATIVE. ROUTE LPB/UYU FLIGHT 304 DIVERTED TO SRE DUE TO THE FOLLOWING REPORT: FLAPS-SLATS AND LEADING EDGE NO EXTEND MORE THAN 1
- [SDR ABXA20261007460](https://openairdocs.org/sdr/ABXA20261007460), Oct 7, 2026: Boeing 7673P6. FLAP SYSTEM. MALFUNCTIONED. ON APPROACH SELECTING FLAPS TO 25, THE CREW GOT THE TRAILING EDGE FLAPS DISAGREE LIGHT AND EICAS, MSG TRAILING EDGE FLAP (N764CK)
- [SDR AALA202610027158](https://openairdocs.org/sdr/AALA202610027158), Sep 30, 2026: Boeing 737823. SENSOR. INOPERATIVE. AIRCRAFT WAS GROUNDED: DURING FLAP EXTENSION UP TO 1 TRAILING EDGE FLAP ASSIMETRY ( INDICATION SPLIT AND STUCK) . AFTER  (N914NN)
- [SDR CALA2026092919963](https://openairdocs.org/sdr/CALA2026092919963), Sep 25, 2026: Boeing 7379. PROXIMITY SENSOR. FAULTED. INTERMITTENT LE FLAP EXT LIGHT AND OVHD FLAP 1 FULL XTND INDICATOR, SPEED CMD DROPS TO .63. ON ARRIVAL FSEU BITE FAULTED (N37473)
- [SDR SWAA2026092151509](https://openairdocs.org/sdr/SWAA2026092151509), Sep 18, 2026: Boeing 7377H4. TRANSMITTER. FAULTED. WHEN SELECTING FLAPS TO 5 THEN 15, THE FLAP INDICATOR SHOWED A MINOR SPLIT OF THE FLAPS. ONE FLAP WAS IN UP POSITION OTH (N448WN)
- [SDR CALA2026091419414](https://openairdocs.org/sdr/CALA2026091419414), Sep 11, 2026: Boeing 737824. INDICATOR. NO DISCREPANCY. FLAP INDICATOR SHOWED 25 WITH FLAP LEVER IN 30 POSITION RESET FLAP POS/SKEW SNSR & IND RIGHT AND LEFT CB REF FIM 27-51 T (N87507)
- [SDR JJBA20260908004](https://openairdocs.org/sdr/JJBA20260908004), Sep 4, 2026: Emb EMB145XR. SENSOR. FAULTED. FLAP FAIL ON FLIGHT. FOUND FLAP LT SENSOR FAILED AND FLAP DRIVE SENSOR FAILED ON CMC. PERFORMED FIM. REMOVED AND REPLACE (N17196)
- [SDR SWAA2026083196211](https://openairdocs.org/sdr/SWAA2026083196211), Aug 28, 2026: Boeing 7377H4. SENSOR. INDICATION. OTS - TRAILING EDGE FLAP ASYMMETRY, FLAP LESS THAN 1. ON FLAP INDICATOR. FLAP LOCKOUT._ R&R POSITION 8 T/E FLAP SKEW SEN (N201LV)
- [SDR SWAA2026082756964](https://openairdocs.org/sdr/SWAA2026082756964), Aug 26, 2026: Boeing 7378. TRANSMITTER. FAULTED. ON FINAL APPROACH DURING FLAP EXTENSION, FLAP INDICATOR WAS AT FLAPS 10 WITH FLAPS LEVER AT 30. RAN THE TRAILING EDGE FL (N8997Q)
- [SDR HNAA2026082600790](https://openairdocs.org/sdr/HNAA2026082600790), Aug 25, 2026: Emb EMB145LR. FLAP. FAULTED. DURING GO AROUND GOT FLAP FAIL MESSAGE AT 1 WITH FLAPS SELECTED TO 0. R & R RT INBD FLAP IAW AMM 27-50-00-000-801-A, & 2 (N645AE)
- [SDR AALA202608267931](https://openairdocs.org/sdr/AALA202608267931), Aug 24, 2026: Boeing 737823. TRANSMITTER. FAULTED. AIRCRAFT WAS GROUNDED: FLAP WOULD NOT LOWER PAST FLAPS 2 POSITION. HAD TO MANUALLY LOWER THE FLAPS TO 15 FOR LANDING. HY (N990AN)
- [SDR DALA2026082404787](https://openairdocs.org/sdr/DALA2026082404787), Aug 23, 2026: Boeing 717200. TRANSMITTER. FAULTED. ATO- APPROX 60KTS DUE TO FLAPS AURAL WARNING. REPLACED RT FLAP POSITION TRANSMITTER PER AMM 27-54-01. OPS CHECK GOOD. (8 (N939AT)
- [SDR SWIA2026081376842](https://openairdocs.org/sdr/SWIA2026081376842), Aug 13, 2026: Emb ERJ170200LL. LIMITER. TRIPPED. FLAPS FAILED ON TAKEOFF. STUCK ON FLAP 1. RAN THE QRH DID NOT FIX. (FLIGHT 5384) UPON ARRIVAL POWERED DOWN ACFT, POWERED (N619UX)
- [SDR AALA202608130920](https://openairdocs.org/sdr/AALA202608130920), Aug 11, 2026: Airbus A321211. PROXIMITY SENSOR. OUT OF ADJUST. AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED INBOUND INTO SAN DUE TO THE FLIGHT CREW REPORTING THAT ON APPROACH WHEN (N172US)
- [SDR SWIA2026072676674](https://openairdocs.org/sdr/SWIA2026072676674), Jul 26, 2026: Cndair CL6002C11. WARNING MESSAGE. ILLUMINATED. FLAP FAIL CAUTION MESSAGE. QRH ACTION. LANDED FLAPS 1 UNEVENTFUL. BRAKES 6996 (FLIGHT 4288) OPEN. (N712SK)
- [SDR DALA2026072804354](https://openairdocs.org/sdr/DALA2026072804354), Jul 24, 2026: Boeing 757351. WARNING MESSAGE. FALSE ACTIVATION. DE/FCNT- DUE T/E FLAP DISAGREE MESSAGE. T/S PER FIM. INSPECTED TORQUE LIMITERS. CHECKED ADJUSTMENT OF FLAP TRANSMITTERS. (N584NW)
- [SDR DALA2026072104271](https://openairdocs.org/sdr/DALA2026072104271), Jul 21, 2026: Boeing 737932ER. TRANSMITTER. FAULTED. FCNT- PERFORMED GO AROUND DUE TO TRAILING EDGE FLAP LOCKOUT. REPLACED LEFT FLAP POSITION TRANSMITTER AND FSEU. OPS CHECK (N899DN)
- [SDR SIMA20260716002](https://openairdocs.org/sdr/SIMA20260716002), Jul 16, 2026: Emb ERJ170100SE. SENSOR. FAULTED. FLAP FAIL ON EICAS UPON ARRIVAL INTO KLSE. RAN QRH; LANDED WITH SLAT (3)/FLAP 0. (3RD REPEAT EVENT). TROUBLESHOOTING REP (N748RR)
- [SDR FDEA202607160937](https://openairdocs.org/sdr/FDEA202607160937), Jul 16, 2026: Boeing 76732LF. TRANSMITTER. FAILED. ON APPROACH INTO LAS, SELECTED FLAPS 25 & CAPTAIN NOTICED FLAPS BECAME ASYMMETRICAL LEAVING 20. NEVER RECEIVED ANY INDIC (N297FE)
- [SDR A6WA202607128899](https://openairdocs.org/sdr/A6WA202607128899), Jul 12, 2026: Cndair CL6002B19. WARNING LIGHT. ILLUMINATED. DURING CLIMB RECEIVED FLAPS FAIL CAUTION OCCURRED AT FL220. FLAPS WERE NOT SELECTED FLAPS FAILED AT 0. NO IMPROPER FLAP  (N410AW)
- [SDR AALA202607139902](https://openairdocs.org/sdr/AALA202607139902), Jul 10, 2026: Boeing 737823. PROXIMITY SWITCH. FAULTY. AIRCRAFT WAS GROUNDED: LE FLAPS TRANSIT AMBER LIGHT ILLUMINATED IN CRUISE AT FLIGHT LEVEL 380 WITH THE NR 3 LEADING EDGE (N980AN)
- [SDR HNAA2026071300591](https://openairdocs.org/sdr/HNAA2026071300591), Jul 9, 2026: Emb EMB145LR. SENSOR. ABNORMAL. FLAP FAIL ON TAKEOFF. T/S IAW FIM 27-51-00-810-805 BLOCK DIAG 1 STEPS 1,2,3,4,20,21. R & R FLAP VELOCITY SENSOR IAW AMM  (N649PP)
- [SDR P5CA2026070600024](https://openairdocs.org/sdr/P5CA2026070600024), Jul 4, 2026: Boeing 74787UF. SENSOR. FAULTED. FLAPS DRIVE MSG IMMEDIATELY AFTER ROTATION BELOW 300 FT. REMOVED AND REPLACED FLAP SKEW SENSOR AND RE-SECURED CONNECTOR  (N857GT)
- [SDR SWAA2026070618708](https://openairdocs.org/sdr/SWAA2026070618708), Jul 4, 2026: Boeing 7377H4. SENSOR. FAULTED. ON APPROACH FLAPS STUCK AT THE 10 POSITION. R & R T/E SKEW SENSOR NR 5 IAW AMM 27-59-01. OPS CHECKED GOOD. REF AHM - FLA (N444WN)
- [SDR AALA202607015686](https://openairdocs.org/sdr/AALA202607015686), Jun 30, 2026: Boeing 737823. SENSOR. INOPERATIVE. AIRCRAFT WAS GROUNDED: 210 KNOTS, DURING FLAP EXTENSION FROM 0 TO 1 A TRAINING EDGE FLAP ASYMMETRY OCCURRED AND THE FLAP (N931NN)
- [SDR CALA2026063017477](https://openairdocs.org/sdr/CALA2026063017477), Jun 28, 2026: Boeing 737924ER. SENSOR. FAULTED. ON APPROACH FLAP ASSYMETRY LESS THAN 1 DEGREE. FULL LEADING E DGE SLATS UPON TROUBLESHOOTING FOUND MAINTENANCE MESSAGE 2 (N39475)
- [SDR IPXA2026062990060](https://openairdocs.org/sdr/IPXA2026062990060), Jun 27, 2026: Boeing 76734AF. INDICATOR. STUCK. EMERGENCY DECLARED, FLAP INDICATOR DISAGREE ,RAN QRH CHECKLIST.RT TE PLAP INDICATOR EVENTUALLY UNSTUCK REMOVED AND REPLA (N320UP)
- [SDR SWAA2026062915542](https://openairdocs.org/sdr/SWAA2026062915542), Jun 24, 2026: Boeing 7377H4. TRANSMITTER. FAULTED. ON APPROACH TE FLAP STUCK ON '1'. USED ALTERNATE FLAPS TO LOWER FLAPS TO '15'. NO BRAKE COOLING ISSUES ON LANDING. TAXIN (N463WN)
- [SDR CALA2026062517348](https://openairdocs.org/sdr/CALA2026062517348), Jun 23, 2026: Boeing 737824. BULB. BURNED OUT. LE FLAPS TRANSIT LIGHT ON AT FLAPS 10. LIGHT WENT GREEN AT FLAP S 15. PERFORMED OPS TEST REF FIM TASK 27-51 TASK 801 AND (N76503)
- [SDR ABXA20260622283](https://openairdocs.org/sdr/ABXA20260622283), Jun 22, 2026: Boeing 76731B. FLAP SYSTEM. WARNING MESSAGE. TRAILING EDGE FLAP DISAGREE DISPLAYED 5 TIMES DURING THE TAXI TO TAKEOFF AND THEN WENT AWAY. CREW ABORTED TAKEOFF (ATO)  (N1361A)
- [SDR CALA2026061917197](https://openairdocs.org/sdr/CALA2026061917197), Jun 17, 2026: Boeing 7379. SENSOR. FAULTED. FLAPS ASYMMETRY ALT FLAPS EXTENSION FLAPS 5 LANDING FAULTS UPLOADED. REMOVED AND REPLACED NR 7 FLAP SKEW SENSOR. REF AMM (N17436)
- [SDR DALA2026061803633](https://openairdocs.org/sdr/DALA2026061803633), Jun 17, 2026: Boeing 767332. TRANSMITTER. FAULTED. CREW DECLARED EMERGENCY DURING APPROACH. T/E ASSY. FOLLOWED QRH WITH UNEVENTFUL LANDING. REPLACED NBR 8 FLAP POSITION XM (N187DN)
- [SDR AALA202606156465](https://openairdocs.org/sdr/AALA202606156465), Jun 13, 2026: Boeing 737823. TRANSMITTER. INOPERATIVE. AIRCRAFT WAS GROUNDED: FLAPS WOULD NOT EXTEND PAST 1 WITH HANDLE IN 5,10,15 POSITION. DID ALTERNATE FLAP EXTENSION TO GE (N342PM)
- [SDR 2026FA0000525](https://openairdocs.org/sdr/2026FA0000525), Jun 11, 2026: Boeing 737800*. TRANSMITTER. FAULTY. ROUTE CBB/LPB FLIGHT 600 AIRCRAFT DIVERTED TO SLCB DUE TO TRAILING EDGE FLAP ASYMMETRY POSITION #2
- [SDR ABXA20260608249](https://openairdocs.org/sdr/ABXA20260608249), Jun 8, 2026: Boeing 767232. SHUTOFF VALVE. FAULTED. ON LANDING, CREW RECEIVED FLAP/SLAT ELEC WARN STATUS MSG. PERFORMED FIM 27-51 FT 836. FOUND PREV FAULT # 27810047. CHECK (N745AX)
- [SDR AALA202606023396](https://openairdocs.org/sdr/AALA202606023396), May 30, 2026: Boeing 737823. TRANSMITTER. INOPERATIVE. AIRCRAFT WAS GROUNDED: ON APPROACH TRAILING EDGE FLAPS WERE SPLIT AT FLAPS 25 AND RIGHT FLAPS BETWEEN 15 AND 25 DEGREES  (N897NN)
- [SDR SWAA2026060107574](https://openairdocs.org/sdr/SWAA2026060107574), May 29, 2026: Boeing 7377Q8. SENSOR. FAULTY. TAKE OFF CONFIG WARNING ON TAKE OFF. FLAPS INDICATION SPLIT RIGHT 1/2 DEGREE HIGHER THEN LEFT. FOUND FC 27-53255 FLAP 6  (N7875A)
- [SDR DXTA2026060108276](https://openairdocs.org/sdr/DXTA2026060108276), May 29, 2026: Cndair CL6002B16. SENSOR. DEFECTIVE. WHILE CLIMBING THROUGH FL370 WE RECEIVED FLAP OVER SPEED CLACKER WITH ASSOCIATED VMO LIMIT MESSAGE ON ATS. FLAP AND GEAR (N206QS)
- [SDR DALA2026052903276](https://openairdocs.org/sdr/DALA2026052903276), May 26, 2026: Boeing 737832. SENSOR. MALFUNCTIONED. SHIP 3735 -FCNT/DE- DECLARED EMERGENCY DUE TO FLAP ASYMMETRY ON APPROACH. MAINTENANCE REPLACED FLAP SKEW SENSOR #3 PER A (N3735D)
- [SDR CALA2026052916662](https://openairdocs.org/sdr/CALA2026052916662), May 25, 2026: Boeing 737824. SENSOR. INTERMITTENT. DURING CRUISE, FL380. LE FLAP TRANSIT LIGHT ILLUMINATED NR 4 LE FLAP OVRHEAD LIGHT ALSO ILLUM. PERFORMED FIM 27-88 TASK  (N37290)
- [SDR SWAA2026051803871](https://openairdocs.org/sdr/SWAA2026051803871), May 16, 2026: Boeing 7378. TRANSMITTER. OUT OF TOLERANCE. DURING APPROACH FLAPS DID NOT GO PAST '5' WHEN HANDLE WAS MOVED TO '15'. RAN QRH ' TRAILING EDGE FLAPS DISAGREE.' CONFIG (N8890Q)
- [SDR CALA2026051816338](https://openairdocs.org/sdr/CALA2026051816338), May 14, 2026: Boeing 757224. WARNING MESSAGE. FALSE ACTIVATION. TE FLAP DISAGREE AFTER FLAP 25 SELECTION PERFORMED OPERATIONAL CHECK OF THE TE FLAPS. OPS CHECK GOOD. REF: AMM TASK 27-5 (N14106)
- [SDR CALA2026051516295](https://openairdocs.org/sdr/CALA2026051516295), May 13, 2026: Boeing 737724. TRANSMITTER. FAULTED. NOTICED AT CRUISE THAT R FLAP TE IND HALF WAY BETWEEN 0 AND 1.NO LE OR TE FLAP LIGHTS ON DEBRIEF INBOUND FLT CREW, STATE (N15710)
- [SDR AALA202605116813](https://openairdocs.org/sdr/AALA202605116813), May 10, 2026: Boeing 737823. INDICATOR. FAULTED. AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: DURING APPROACH NOTICED A TRAILING EDGE FLAP ASYMMETRY. AIRCRAF (N826NN)
- [SDR AALA202605055844](https://openairdocs.org/sdr/AALA202605055844), May 4, 2026: Boeing 737823. TRANSMITTER. FAULTED. AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: FLAPS DID NOT EXTEND PAST 10 DEGREES WITH NORMAL PROCEDURE IT S (N915NN)
- [SDR SWIA2026050275974](https://openairdocs.org/sdr/SWIA2026050275974), May 2, 2026: Emb ERJ170200LR. CONTROL LEVER. WARNING MESSAGE. FLAP FAIL CAUTION MESSAGE, RETURNED TO FIELD QRH DID NOT CLEAR MESSAGE. (FLIGHT 3952) INTERROGATED CMC FOUND FAULT CODE  (N247SY)
- [SDR AALA202605013131](https://openairdocs.org/sdr/AALA202605013131), Apr 30, 2026: Boeing 737823. SENSOR. FAULTY. AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: DURING APPROACH WHEN FLAPS 1 SELECTEDNO RESPONSE FROM FLAPS. AI (N970AN)
- [SDR WX0A2026042932799](https://openairdocs.org/sdr/WX0A2026042932799), Apr 28, 2026: Boeing 7378200. FLAP SYSTEM. FAULTED. (ACFT GROUNDED) (EMER DECLARED) DURING APPR WHEN FLAP HANDLE MOVED 15 - 30, FLAPS STOPPED AT R27, L29. FLAPS IND LOW 25  (N818NV)

All 3,079: https://openairdocs.org/jasc/2751/reports.md

## Other codes in chapter 27

- [JASC 2700](https://openairdocs.org/jasc/2700): Flight Control System (1,742 reports)
- [JASC 2701](https://openairdocs.org/jasc/2701): Control Column Section (510 reports)
- [JASC 2710](https://openairdocs.org/jasc/2710): Aileron Control System (2,967 reports)
- [JASC 2711](https://openairdocs.org/jasc/2711): Aileron Tab Control System (415 reports)
- [JASC 2720](https://openairdocs.org/jasc/2720): Rudder Control System (3,131 reports)
- [JASC 2721](https://openairdocs.org/jasc/2721): Rudder Tab Control System (686 reports)
- [JASC 2722](https://openairdocs.org/jasc/2722): Rudder Actuator (284 reports)
- [JASC 2730](https://openairdocs.org/jasc/2730): Elevator Control System (2,647 reports)
- [JASC 2731](https://openairdocs.org/jasc/2731): Elevator Tab Control System (1,296 reports)
- [JASC 2740](https://openairdocs.org/jasc/2740): Stabilizer Control System (2,126 reports)
- [JASC 2741](https://openairdocs.org/jasc/2741): Stabilizer Position Indicating (889 reports)
- [JASC 2742](https://openairdocs.org/jasc/2742): Stabilizer Actuator (610 reports)
- [JASC 2750](https://openairdocs.org/jasc/2750): Trailing Edge Flap Control System (10,187 reports)
- [JASC 2752](https://openairdocs.org/jasc/2752): Trailing Edge Flap Actuator (1,978 reports)
- [JASC 2760](https://openairdocs.org/jasc/2760): Drag Control System (3,502 reports)
- [JASC 2761](https://openairdocs.org/jasc/2761): Drag Control Actuator (1,070 reports)
- [JASC 2770](https://openairdocs.org/jasc/2770): Gust Lock Damper System (90 reports)
- [JASC 2780](https://openairdocs.org/jasc/2780): Leading Edge Slat Control System (2,158 reports)
- [JASC 2781](https://openairdocs.org/jasc/2781): Leading Edge Slat Position Indicating System (1,398 reports)
- [JASC 2782](https://openairdocs.org/jasc/2782): Leading Edge Slat Actuator (1,225 reports)
- [JASC 2797](https://openairdocs.org/jasc/2797): Flight Control System Wiring (920 reports)

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