# JASC 2780: Leading Edge Slat Control System

- Type: JASC system/component code (FAA)
- ATA chapter: 27 Flight Controls
- Title in the code table: LE SLAT CONTROL SYSTEM
- Service difficulty reports: 2,157
- FAA code table: https://www.faa.gov/sites/faa.gov/files/JASC_Code.pdf#page=26
- Page: https://openairdocs.org/jasc/2780

## What it covers

The system components and parts except the actuator and position indicating system that controls the position and movement of the wing leading edge devices used for lift augmenting. Does not include the structure, hinges, and parts that do not cause movement of the surface filed in JASC code 5754. Typical parts are leading edge flaps, variable opening wing slots, priority valve, switch, cable, pulley, actuator bracket, torque shaft, regulator, etc.

## Service difficulty reports (2,157, newest 50)

- [SDR ABXA20260923433](https://openairdocs.org/sdr/ABXA20260923433), Sep 23, 2026: Boeing 76736N. MOTOR. DEFECTIVE. DURING TAXI, LE SLAT DISAGREE. CREW RETURNED TO THE GATE (BTB). CHECKED WIRING OF ALTERNATE INBORAD SLAT DRIVE MOTOR M49 (N1013A)
- [SDR CALA2026091819537](https://openairdocs.org/sdr/CALA2026091819537), Sep 15, 2026: Boeing 737824. FSEU. FAULTED. CREW REJECTED TAKEOFF DUE TO A SLAT TRANSIT LIGHT. CREW REPORTED RTO WAS AT 138KTS, MAX REVERSE, 157300LBS AND OAT 13C.T (N39297)
- [SDR SIMA20260831002](https://openairdocs.org/sdr/SIMA20260831002), Aug 31, 2026: Emb ERJ170200LR. SENSOR. FAILED. SLAT FAIL 7000 FT 210 KNOTS (EMERGENCY DECLARED). REMOVED AND INSTALLED LT OUTBOARD SLAT SKEW SENSOR IAW AMM 27-83-01 OP (N299JJ)
- [SDR SWIA2026082076936](https://openairdocs.org/sdr/SWIA2026082076936), Aug 20, 2026: Cndair CL6002C11. SENSOR. FAULTED. IN FLT RECEIVED A SLATS FAIL CAUTION MSG. FAILED AT 1 DEGREE. WHEN THE FLAPS TO 45 FOR LANDING, SLATS WENT TO 25. (FLT 4 (N703SK)
- [SDR ANCF20260810016](https://openairdocs.org/sdr/ANCF20260810016), Aug 10, 2026: Airbus A320214. FWC. ABNORMAL. SLATS DOES NOT RETRACT TO 0° POSITION.REMOVED AND REPLACED FLIGHT WARNIG COMPUTER (1) IAW AMM 31-53-34-400-001-A, FLIGHT (N980AV)
- [SDR DALA2026072404316](https://openairdocs.org/sdr/DALA2026072404316), Jul 24, 2026: Boeing 717200. CONTROL CABLE. WORN. WEAR ON CABLE 185B BTW STA XIS 100 AND XIS 120 OF SLAT SYSTEM AT LT WING, REPAIRED SLAT CONTROL CABLE PER B717 AMM 27-81 (N932AT)
- [SDR YYMA2026072400600](https://openairdocs.org/sdr/YYMA2026072400600), Jul 23, 2026: Emb ERJ170100LR. SLAT SYSTEM. FAULTED. ON APPROACH INTO KALN MRO FACILITY LOCATION, CREW REPORTED: DURING APPROACH SLAT FAIL INDICATION WITH SHAKER ANTICIPATED (N177RS)
- [SDR YYMA202607230159](https://openairdocs.org/sdr/YYMA202607230159), Jul 21, 2026: Emb ERJ170100LR. SLAT SYSTEM. FAILED. CREW REPORTED SLAT FAILED (SHAKER ANTICIPATED) DURING APPROACH WHEN FLAP LEVER MOVED FROM POSITION 0. (N177RS)
- [SDR YYMA2026071600589](https://openairdocs.org/sdr/YYMA2026071600589), Jul 16, 2026: Emb ERJ170100LR. SLAT SYSTEM. FAILED. CREW REPORTED: SLAT FAIL AT 0 ON APPROACH WHEN S/F1 SELECTED. ATTEMPTED RESET PER QRH, UNSUCCESSFUL. (N177RS)
- [SDR SWIA2026071576653](https://openairdocs.org/sdr/SWIA2026071576653), Jul 15, 2026: Emb ERJ170100LR. SLAT SYSTEM. FAULTED. SLAT FAIL ON CLIMB OUT BETWEEN 1 AND 0. RAN QRH, THE MESSAGE DID NOT GO AWAY. FLIGHT 4687. OPEN (N732SY)
- [SDR SWIA2026071176618](https://openairdocs.org/sdr/SWIA2026071176618), Jul 11, 2026: Emb ERJ170100LR. SLAT SYSTEM. FAULTED. SLAT FAIL WHILE RETRACTING FROM 1 TO UP IN THE INITIAL CLIMB. RAN QRH AND COULD NOT GET THE MESSAGE TO EXTINGUISH. FLIGH (N732SY)
- [SDR FXTA20260617001](https://openairdocs.org/sdr/FXTA20260617001), Jun 17, 2026: Textrn 408. FLEX DRIVE. FAILED. LH AND RH OUTBOARD FLAP FLEX SHAFT RUBBER CASE FAILING AT THE CRIMP UNDER STAINLESS STEEL OUTER WRAP. THIS SEPARATION AL (N701BA)
- [SDR ABXA20260608250](https://openairdocs.org/sdr/ABXA20260608250), Jun 8, 2026: Boeing 767232. MODULE. DEFECTIVE. AFTER PUSHBACK, FLAP/SLAT ELEC STATUS MSG. REPLACED FLAP/SLAT SHUTOFF VALVE MODULE PER B767 AMM 27-51-48 LEAK & OPS CK G (N745AX)
- [SDR SIMA20260607001](https://openairdocs.org/sdr/SIMA20260607001), Jun 7, 2026: Emb ERJ170200LR. TORQUE TUBE. FAILED. SLAT FAIL ON APPROACH. TRANSFERRED TO NRWC 013-ORD-04163 EMERGENCY DECLARED. R & R SLAT TORQUE TUBE LT WING MOST OUTBOAR (N213NN)
- [SDR ABXA20260607248](https://openairdocs.org/sdr/ABXA20260607248), Jun 7, 2026: Boeing 767381. WARNING MESSAGE. FALSE ACTIVATION. LE SLAT DISAGREE EICAS MSG/ GND PROX SYS EICAS, QRH RAN. PERFORMED BITE CHK OF THE PSEU IAW FIM 32-09 FT 803. NO FAULTS  (N290CM)
- [SDR DALA2026060903437](https://openairdocs.org/sdr/DALA2026060903437), Jun 4, 2026: Boeing 717200. CONTROL CABLE. LOW TENSION. IN REF TO AMDS 2780-2003: LOW TENSION ON EXTEND CONTROL CABLE OF SLAT 1 AT RIGHT WING. FINAL ADJUSTMENT OF THE EXTEND CO (N923AT)
- [SDR FDEA202606021105](https://openairdocs.org/sdr/FDEA202606021105), Jun 2, 2026: Boeing 767300. SWITCH. FAILED. LEADING EDGE SLAT ASSYMETRY ON APPROACH.COMPLIED WITH QHR. DECLARED AN EMERGECY. LANDING UNEVENTFUL. WRITE UP OPEN BY FL (N248FE)
- [SDR CALA2026051816340](https://openairdocs.org/sdr/CALA2026051816340), May 14, 2026: Boeing 737724. FSEU. FAULTY. FLAP ASYMMETRY WHILE EXTENDING. LEFT FLAP STAYED AT 0. ACCOMPLISHED FSEU BITE, RESULTS MAINT MSG 27-81218 INTERMITENT. C (N15710)
- [SDR IPXA2026051924905](https://openairdocs.org/sdr/IPXA2026051924905), May 11, 2026: Boeing 767381. GUARD. BROKEN. FOUND LEFT WING INBOARD SLAT TORQUE TUBE GUARD BROKEN AT WBL 121.0. I.A.W AMM 20-11-00-910-802 REV 148 REPLACE LEFT WING (N394UP)
- [SDR IPXA2026050631728](https://openairdocs.org/sdr/IPXA2026050631728), Apr 29, 2026: Boeing 75724APF. SLAT SYSTEM. WARNING MESSAGE. EMERGENCY DECLARED. LE SLAT DISAGREE PREFORMED FIM 27-81-803. NO FAULTS NOTED ON BITE PROCEDURE. CYCLED FLAPS AND SLATS  (N444UP)
- [SDR ANCF20260422010](https://openairdocs.org/sdr/ANCF20260422010), Apr 22, 2026: Airbus A320214. COMPUTER. ABNORMAL. DURING FLAP/SLAP RETRACTION AT TAKEOFF F7CTL SLTAS LOCKED WING TIP BRK IAW AMM 27-51-34-000-001A AND 27-51-34-400-001A R (N206FR)
- [SDR FDEA202604220492](https://openairdocs.org/sdr/FDEA202604220492), Apr 22, 2026: Boeing 7673S2F. SLAT SYSTEM. FAULTED. LEADING EDGE SLAT DISAGREE CAUTION MESSAGE APPEARED WHEN FLAPS WERE SELECTED FROM ZERO TO ONE. WE DECLARED AN EMERGENCY  (N182FE)
- [SDR CALA2026041615418](https://openairdocs.org/sdr/CALA2026041615418), Apr 15, 2026: Boeing 737824. VALVE. FAULTY. ON APPROACH LE FLAPS TRANSIT LITE ILLUMINATE D. CREW STATES THAT ON FIRST APPROACH, AC ENCOUNTERED STRONG GUSTS OF WIND. (N76529)
- [SDR ABXA20260410157](https://openairdocs.org/sdr/ABXA20260410157), Apr 10, 2026: Boeing 767231. PROXIMITY SWITCH. DEFECTIVE. ON DEPARTURE DURING CLIMB, DURING RETRACTING OF FLAPS, LE SLAT ASYM ILLUMINATED. FLIGHT CREW DECLARED EMERGENCY AND DID  (N650GT)
- [SDR AALA202604108733](https://openairdocs.org/sdr/AALA202604108733), Apr 9, 2026: Airbus A321231. ACTUATOR. FAULTED. AIRCRAFT WAS GROUNDED: AN EMERGENCY INTO DFW DUE TO THE FLIGHT CREW REPORTING A FLIGHT CONTROL SLATS FAULT ON ARRIVAL. S (N990AU)
- [SDR DALA2026040602169](https://openairdocs.org/sdr/DALA2026040602169), Apr 4, 2026: Airbus A321211. LIMITER. TRIPPED. DUE TO F/CTL SLATS FAULT ECAM WARNING, WOULD NOT EXTEND. FOUND RIGHT WING SLAT #4 OUTBOARD ACTUATOR TORQUE LIMITER TRIPP (N371DN)
- [SDR DALA2026031901903](https://openairdocs.org/sdr/DALA2026031901903), Mar 18, 2026: Airbus BD5001A11. SEAL. DAMAGED. /H WING- DURING OK TO INSTALL # 2 SLAT FOUND TELESCOPIC DUCT SEAL DAMAGED. SCEPTRE LOG PAGE ENTERED FOR SDR REPORTING. S (N302DU)
- [SDR AALA202603195313](https://openairdocs.org/sdr/AALA202603195313), Mar 16, 2026: Airbus A321253NX. ACTUATOR. TRIPPED. AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED ON APPROACH INTO LAS DUE TO THE FLIGHT CREW REPORTING A FLIGHT CONTROL  (N441UW)
- [SDR AALA202603175313](https://openairdocs.org/sdr/AALA202603175313), Mar 16, 2026: Airbus A321253NX. SLAT SYSTEM. FAULTED. AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED ON APPROACH INTO LAS DUE TO THE FLIGHT CREW REPORTING A FLIGHT CONTROL  (N441UW)
- [SDR CALA2026030314293](https://openairdocs.org/sdr/CALA2026030314293), Feb 28, 2026: Boeing 737724. FSEU. FAULTED. LE FLAP TRANSIT ILLUMINATED AT 230 KNOTS. WENT OUT 10 MINUTES LATER AT 20 0. SLAT 1. PERFORMED FSEU BITE, NO FAULTS IN L (N16732)
- [SDR AALA202602040697](https://openairdocs.org/sdr/AALA202602040697), Feb 2, 2026: Airbus A321231. ACTUATOR. TRIPPED. AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED INTO DFW DUE TO THE FLIGHT CREW REPORTING A SLAT / FLAPS FAULT DISPLAYE (N145AN)
- [SDR R61A2026012800030](https://openairdocs.org/sdr/R61A2026012800030), Jan 28, 2026: Emb ERJ170100SE. MODULE. FAULTED. SLAT FAIL ON APPROACH. MSG CLEARED WITH QRH. DECLARED EMERGENCY, LANDED WITHOUT INCIDENT. PERFORMED AIOP A2 MODULE RESET (N979RP)
- [SDR DALA2026012600598](https://openairdocs.org/sdr/DALA2026012600598), Jan 25, 2026: Airbus A320212. WARNING MESSAGE. ILLUMINATED. DE DUE TO FLT CONTROL SLATS LOCKED ECAM WARNING. OPEN (LP: 8418992) (N340NW)
- [SDR SIMA202601210001](https://openairdocs.org/sdr/SIMA202601210001), Jan 20, 2026: Emb ERJ170200LR. SLAT SYSTEM. MULTIPLE FAIL. SHAKER ANTICIPATED, AOA LIMIT FAIL, SLAT FAIL, SPDBRK FAIL EICAS MESSAGES APPEARED DURING APPROACH. QRH PROCEDURE FOLLOW (N273NN)
- [SDR F2PA202601200004](https://openairdocs.org/sdr/F2PA202601200004), Jan 18, 2026: Emb EMB505. FLAP SYSTEM. OUT OF RIG. FLAP FAIL CREW WAS STAGED TO LANDED ON FINAL. CONDITIONS WERE IMC, ENGINE AI AND WING STAB WAS ON. UPON SWITCHING FROM F (N329MC)
- [SDR IPXA2026011377249](https://openairdocs.org/sdr/IPXA2026011377249), Jan 13, 2026: Boeing 75724APF. WARNING MESSAGE. ILLUMINATED. EMD, FLAP/SLAT ELEC STATUS MESSAGE TRAILING EDGE FLAPS DISAGREE EICAS RAN CHECK LIST LANDED FLAP 20* (N445UP)
- [SDR DALA2026011200261](https://openairdocs.org/sdr/DALA2026011200261), Jan 12, 2026: Airbus A320212. COMPUTER. FAULTED. F/CTRL SLATS LOCKED ON APPROACH - WING TIP BRAKE ON. PREVIOUS HISTORY OF F/CTRL FAILURES. T/S IAW TSM 27-81-00-810-810-A (N340NW)
- [SDR CALA2026011212886](https://openairdocs.org/sdr/CALA2026011212886), Jan 8, 2026: Boeing 737924ER. FLAP SYSTEM. WARNING LIGHT. LE FLAPS TRANSIT LIGHT ILLUMINATED JUST BEFORE TOP OF DES.AIRS PEED DECA Y AND RIGHT ROLL. PERFORMED FSEU BITE REF FIM 2 (N61881)
- [SDR AALA202601082048](https://openairdocs.org/sdr/AALA202601082048), Jan 7, 2026: Boeing 7878. TRANSDUCER. FAULTY. AIRCRAFT WAS GROUNDED: INBOARD SLAT SKEW SENSOR 6 INBOARD IS FAILED. DECESION MADE TO RETURN TO DFW, AIRCRAFT WAS NOT OV (N810AN)
- [SDR SWIA202512290001](https://openairdocs.org/sdr/SWIA202512290001), Dec 27, 2025: Emb ERJ170200LR. SLAT SYSTEM. WARNING MESSAGE. SLAT FAIL CAUTION ON DEPARTURE. COMPLIED WITH QRH (FLIGHT 3037) NO 10 DAY HISTORY. UPON ARRIVAL TO AIRCRAFT, SLAT FAIL C (N173SY)
- [SDR UIEA2025121601349](https://openairdocs.org/sdr/UIEA2025121601349), Dec 16, 2025: Boeing 7474H6. PDU. WARNING MESSAGE. FLAP DRIVE EICAS MSG. R & R LE FLAP PDU IAW AMM 27-81-05 & IPC 27-81-03-01. OPS CHKD OK. (N718BA)
- [SDR IPXA2025121540049](https://openairdocs.org/sdr/IPXA2025121540049), Dec 15, 2025: Airbus A300F4622R. SPCC. FAULTED. DURING APPROACH, RECEIVED SLAT SYS 1+2 FAULT. RAN QRH AND ECAM. INITIALLY PLANNED <15 SLAT WITH 40 FLAP LANDING. WHEN WE (N125UP)
- [SDR FDEA202512122239](https://openairdocs.org/sdr/FDEA202512122239), Dec 12, 2025: Boeing 757232. TORQUE TUBE. DAMAGED. WHEN CONFIGURING AFTER START SETTING FLAPS TO 5 RECEIVED LE SLAT DISAG EICAS. UPON INSPECTION FOUND THE CONTROL CABLE IN (N990FD)
- [SDR CALA2025111711264](https://openairdocs.org/sdr/CALA2025111711264), Nov 13, 2025: Boeing 737824. COMPUTER. FAULTY. AUTO SLAT FAIL LIGHT LIGHT ON FOUND SMYDC1 FAULTING ON LAST LEG. REMOVED AND REPLACE SMYD 1 AMM 27-32-42 OPS CHECK SAT. (N37274)
- [SDR Y9PA2025111317400](https://openairdocs.org/sdr/Y9PA2025111317400), Nov 13, 2025: Cndair CL6002B16. FLAP SYSTEM. FAILED. AFTER ENGINE START CHECKLIST WAS COMPLETED SELECTED FLAPS 20 FOR TAKEOFF AND FLAPS FAIL AT 0. RESET THE FLAPS TO O AFTER (N28BQ)
- [SDR ABXA20251027281](https://openairdocs.org/sdr/ABXA20251027281), Oct 27, 2025: Boeing 767231. SLAT SYSTEM. FAULTED. LE SLAT DISAGREE EICAS DISPLAYED AFTER TAKEOFF. OUT OF PHX ACCOMPLISHED QRH, AND CLEARED MSG, CONTIUNED TO LAX AND LANDE (N651GT)
- [SDR SWAA2025102728784](https://openairdocs.org/sdr/SWAA2025102728784), Oct 26, 2025: Boeing 7378H4. SENSOR. INOPERATIVE. LE FLAPS TRANSIT LIGHT ON APPROACH. R & R NR 3 RETRACT LEADING EDGE PROXIMITY SENSOR (S172) IAW AMM 27-88-11. (N8678E)
- [SDR GTIA2025102739152](https://openairdocs.org/sdr/GTIA2025102739152), Oct 25, 2025: Airbus A321231. LIMITER. TRIPPED. FTCL SLAT FAULT. RAN ECAM AND LANDED FLAPS 3-PERFORMED T/S IAW TSM 27-81-00-810-810-A, FOUND TORQUE LIMITER AT 6037CM PO (N661NK)
- [SDR AALA202510275989](https://openairdocs.org/sdr/AALA202510275989), Oct 23, 2025: Airbus A321231. ACTUATOR. TRIPPED. AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED INBOUND INTO SFO DUE TO THE FLIGHT CREW REPORTING A FLIGHT CONTROL SLAT (N923US)
- [SDR AALA202510272556](https://openairdocs.org/sdr/AALA202510272556), Oct 23, 2025: Airbus A321231. PICKUP. OUT OF ADJUST. AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED INBOUND INTO SFO DUE TO THE FLIGHT CREW REPORTING A FLIGHT CONTROL SLAT (N923US)

All 2,157: https://openairdocs.org/jasc/2780/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 (3,130 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 (1,295 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 (609 reports)
- [JASC 2750](https://openairdocs.org/jasc/2750): Trailing Edge Flap Control System (10,185 reports)
- [JASC 2751](https://openairdocs.org/jasc/2751): Trailing Flap Position Indicating System (3,078 reports)
- [JASC 2752](https://openairdocs.org/jasc/2752): Trailing Edge Flap Actuator (1,977 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 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 (919 reports)

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