# JASC 3150: Central Warning

- Type: JASC system/component code (FAA)
- ATA chapter: 31 Instruments
- Title in the code table: CENTRAL WARNING
- Service difficulty reports: 3,981
- FAA code table: https://www.faa.gov/sites/faa.gov/files/JASC_Code.pdf#page=32
- Page: https://openairdocs.org/jasc/3150

## What it covers

The panels and associated circuitry which warn of potential problems in two or more independent or related systems. Warnings can be either audible or visual. Typical parts are annunciator panel, relay, lamp, PC board, diode, throttle microswitch, etc.

## Service difficulty reports (3,981, newest 50)

- [SDR K11A2026102200405](https://openairdocs.org/sdr/K11A2026102200405), Oct 22, 2026: Boeing 7374C9. WARNING MESSAGE. MULTIPLE FAIL. DURING TAKEOFF ROLL MASTER CAUTION, FLT CONT AND HYD ANNUNCIATOR LIGHTS ILLUMINATED, FLT CONTROL LOW PRESSURE A LIGHT IL (N730CK)
- [SDR YENA2026101600986](https://openairdocs.org/sdr/YENA2026101600986), Oct 15, 2026: Airbus A321271NX. WARNING MESSAGE. ILLUMINATED. FLT # 1187, BOS-LAX. (ETOPS) "CLASS II AIR BLEED ( CLASS II MAINTENANCE MESSAGES DISPLAYED ON ECAM STATUS PAGE OF ECAM S (N2193J)
- [SDR YENA2026101200940](https://openairdocs.org/sdr/YENA2026101200940), Oct 11, 2026: Airbus A321271NX. WARNING MESSAGE. ILLUMINATED. FLT # 842, DUB-JFK. (ETOPS) "( CLASS II MAINTENANCE MESSAGES DISPLAYED ON ECAM STATUS PAGE OF ECAM SYSTEM DISPLAY FAULT( (N2180J)
- [SDR ABXA20261010465](https://openairdocs.org/sdr/ABXA20261010465), Oct 10, 2026: Boeing 7673P6. WARNING MESSAGE. FALSE ACTIVATION. AFTER BLOCK OUT FWD EQPT EICAS AND VALVE LIGHT ILLUMINTATED AND A/C RETURNED TO THE GATE (BTB) AND MTX GROUNDED A/C. MTX (N762CK)
- [SDR ABXA20261009466](https://openairdocs.org/sdr/ABXA20261009466), Oct 9, 2026: Boeing 7673P6. WARNING MESSAGE. FALSE INDICATION. ON DEPARTURE AT ROTATION HAD A STATUS MSG L EMERG INST XFER BUS MSG AT AROUND 4000FT. MTC DID AN INSTRUMENT BUS VOLTAGE  (N762CK)
- [SDR CVGA20261003001](https://openairdocs.org/sdr/CVGA20261003001), Oct 3, 2026: Emb EMB505. WARNING MESSAGE. FALSE ACTIVATION. BLEED 1 AND BLEED 2 FAIL ON CLIMBOUT ( EMERGENCY DECLARED ) PERFORMED OPS CHECK IAW AMM 36-00-00-710-801-A. OPS CHECK GO (N655UP)
- [SDR DXTA2026100509998](https://openairdocs.org/sdr/DXTA2026100509998), Oct 2, 2026: Emb EMB505. MULTIPLE. MALFUNCTIONED. WHILE IN CRUISE AT FL410 WE REVIEWED MULTIPLE CAS MESSAGES AND AN AURAL AUTO PILOT. THE MESSAGES WERE AP FAIL, SWPS FAUL (N452QS)
- [SDR DXTA2026100509965](https://openairdocs.org/sdr/DXTA2026100509965), Sep 30, 2026: Cessna 680A. CONTROLLER. FAULTED. RECEIVED SUPPLY BLD LEAK R AMBER CAS MESSAGE IN CLIMB. RAN QRH, CLEARED BUT CAME BACK. ATTEMPTED TO DEVIATE OUT OF ICING (N679QS)
- [SDR QR9R2026093000002](https://openairdocs.org/sdr/QR9R2026093000002), Sep 30, 2026: Bolkms BK117C2. WARNING UNIT. MALFUNCTIONED. UNKNOWN MALFUNCTION 1 MASTER CAUTION (RIGHT SIDE) WITH NO INDICATION ON CAD. AIRBUS RESET DONE WITH SOME RESULT UPON LEV
- [SDR SWAA2026100237102](https://openairdocs.org/sdr/SWAA2026100237102), Sep 28, 2026: Boeing 7377H4. FIRE WARNING. ILLUMINATED. CARGO FIRE DISCH IN FLIGHT. VERIFIED NO LEAKS IN BOTTLE COMPARTMEN. DISCHARGE SWITCH VERIFIED OPEN. IAW WDG 26-23-11. RE (N200WN)
- [SDR CALA2026092819855](https://openairdocs.org/sdr/CALA2026092819855), Sep 23, 2026: Boeing 737724. WARNING LIGHT. FALSE ACTIVATION. MASTER CAUTION LIGHT ONCE TO THRUST APPLIED UNDER 40KTS TOMC DEBRIEFED THE CREW AND FOUND NO ASSOCIATED MASTER CAUTION A (N13720)
- [SDR ABXA20260917413](https://openairdocs.org/sdr/ABXA20260917413), Sep 17, 2026: Boeing 767232. WARNING MESSAGE. ACTIVATED. ON TAKEOFF, THRUST LEVER ADVANCED THEN RED SPOILERS EICAS MESSAGE. COMPLETED QRH AND ABORTED TAKE OFF (ATO). CREW RETURN (N745AX)
- [SDR IXXA20260917081](https://openairdocs.org/sdr/IXXA20260917081), Sep 17, 2026: Boeing 767323. MODULE. FAULTED. FIRE BELL HAS GONE OFF 3 TIMES W/ NO EICAS MSG DURING PRE-FLIGHT SETUP. PERFORMED TROUBLESHOOTING IAW FIM 31-51 FT 803.  (N351CM)
- [SDR YENA2026091600802](https://openairdocs.org/sdr/YENA2026091600802), Sep 15, 2026: Airbus A321271NX. WARNING MESSAGE. ACTIVATED. FLT 1621, LHR-BOS. (ETOPS). ( CLASS II MAINTENANCE MESSAGES DISPLAYED ON ECAM STATUS PAGE OF ECAM SYSTEM DISPLAY FAULT(S (N4080J)
- [SDR DXTA2026091509675](https://openairdocs.org/sdr/DXTA2026091509675), Sep 12, 2026: Cessna 680A. WARNING MESSAGE. FALSE ACTIVATION. RECEIVED A RED AIRSPEED INDICATION THAT INDICATED 256 WITH FLAPS SELECTED TO ONE FOR A FEW SECONDS. IMMEDIATELY RAISED F (N633QS)
- [SDR CALA2026091119373](https://openairdocs.org/sdr/CALA2026091119373), Sep 9, 2026: Airbus A320232. SDAC. FAULTED. BLUE/YELLOW HYD PRESSURE DOUBLE AMBER XS ONSD PAGE. FLT CTL SD PAGE SHOWING ONLY G SYS. ISOLATED SDAC 2, CIRCUIT BREAKER (N443UA)
- [SDR ABXA20260907397](https://openairdocs.org/sdr/ABXA20260907397), Sep 7, 2026: Boeing 767375. WARNING MESSAGE. ILLUMINATED. PRE-DEPARTURE FOUND CARGO DET AIR MESSAGE SHOWING (FWD DET FAN ON ECS MSG) , MTX DEFERRED FOR DEPARTURE IAW ABX MEL 26-1 (N1709A)
- [SDR HNAA2026083100811](https://openairdocs.org/sdr/HNAA2026083100811), Aug 30, 2026: Emb EMB145LR. WARNING MESSAGE. FALSE ACTIVATION. NR 2 BLEED VALVE FAILED MESSAGE AFTER AIR START WITH SLIGHT ODOR. RAN ENGINES NO BLEED VALVE FAIL MESSAGE ON EICAS. NO O (N690AE)
- [SDR CALA2026083119073](https://openairdocs.org/sdr/CALA2026083119073), Aug 27, 2026: Boeing 78710. WARNING MESSAGE. FALSE ACTIVATION. ENG EEC C1 RT ENGINE CONTROL IS IN A TIME LIMITED DISPATCH CONDITION. ENGINE CONTROL SYSTEM OPERATING WITH REDUCED REDUN (N12005)
- [SDR ASAA2026082366492](https://openairdocs.org/sdr/ASAA2026082366492), Aug 23, 2026: Airbus A321271N. WARNING MESSAGE. FALSE ACTIVATION. (ECAM DID NOT RETURN) NOTICE TO MX ON T/O ,ENG 1 COMP, STALL ECAM CLRD AFTER 1 SEC , LOW SPEED ABORT. GROUNDED - YES. PE (N214HA)
- [SDR IXXA20260813070](https://openairdocs.org/sdr/IXXA20260813070), Aug 13, 2026: Boeing 767323. DISPLAY. FAULTED. PRIOR TO BLOCK OUT FLIGHT CREW REPORTED LEFT FLIGHT MANAGEMENT COMPUTER FAILED ALONG WITH AN ELECTRICAL SMOKE SMELL. REM (N457AZ)
- [SDR QMLA20260812](https://openairdocs.org/sdr/QMLA20260812), Aug 12, 2026: Bell 407. INDICATOR. INOPERATIVE. RECEIVED AND INSTALLED REPLACEMENT MGT INDICATOR. APPLIED GROUND POWER AND THE UNIT PASSED THE LCD TEST. AFTER ENGINE ST (N445SL)
- [SDR QMLA2026081301](https://openairdocs.org/sdr/QMLA2026081301), Aug 11, 2026: Bell 407. INDICATOR. DIM. THE MGT INDICATOR WAS WRITTEN UP AS DIM. WE HAD A REPAIRED UNIT IN STOCK AND REPLACED THE INDICATOR. TWO POWER CYCLES WE (N445SL)
- [SDR SWAA2026081364358](https://openairdocs.org/sdr/SWAA2026081364358), Aug 9, 2026: Boeing 7377H4. WARNING MESSAGE. FALSE ACTIVATION. NR 2 ENG OVERHEAT IND WITH NO FUEL APPLIED. INSPECTED NR 2 ENG INLET AND EXHAUST AREA NO DEFECTS NOTED. PERFORMED NORMAL (N241WN)
- [SDR DXTA2026080709133](https://openairdocs.org/sdr/DXTA2026080709133), Aug 4, 2026: Cessna 680A. WARNING MESSAGE. FALSE ACTIVATION. REPEAT WRITE UP. PLANE GOES INTO ELECTRAL EMERGENCY WHILE STARTING ENGINE NUMBER TWO. ALSO HAVE A FUEL PUMP 2 FAIL CAS N (N676QS)
- [SDR DXTA2026080709146](https://openairdocs.org/sdr/DXTA2026080709146), Aug 4, 2026: Cndair CL6002B16. INDICATION SYS. MALFUNCTIONED. CLIMBING THROUGH FL370 - FL390, POWER SWITCHED FROM CLB TO MCT ON ITS OWN. SHORTLY AFTER RECEIVED A LT ENG CAUTION & LT  (N263QS)
- [SDR CALA2026081018429](https://openairdocs.org/sdr/CALA2026081018429), Aug 2, 2026: Boeing 737824. WARNING MESSAGE. ILLUMINATED. RTO DUE TO T/O CONFIG. WHILE DEBRIEFING THE CREW THE FOLLOWING INFORMATION WAS FOUND: SPEED AT REJECTION: 115KTS RTO ENG (N36247)
- [SDR QMLA2026080220051](https://openairdocs.org/sdr/QMLA2026080220051), Aug 1, 2026: Urocop EC135P2. WARNING LIGHT. FALSE ACTIVATION. WHILE INFLIGHT DUAL FADEC MINOR CAUTION LIGHTS ILLUMINATED. NO OTHER INDICATIONS NOTED. LANDED SAFELY AT LOCAL AIRPORT.  (N139TJ)
- [SDR DALA2026080304478](https://openairdocs.org/sdr/DALA2026080304478), Jul 30, 2026: Boeing 737932ER. WARNING MESSAGE. FALSE ACTIVATION. APPROX 50KTS DUE TO TAKEOFF WARNING ANNUNCIATION. PERFORMED BITE TEST OF PSEU, OPERATIONAL TEST OF TAKEOFF WARNING SYSTE (N929DZ)
- [SDR ABXA20260729338](https://openairdocs.org/sdr/ABXA20260729338), Jul 29, 2026: Boeing 76731B. WARNING MESSAGE. FALSE ACTIVATION. LEFT ENG BLEED OFF EICAS MSG AFTER STARTING #1 ENGINE. ACCOMPLISHED 227 NNC AND ADVANCED THRUST TO 78% N2 DID NOT RESOLV (N1361A)
- [SDR VNAA2026073021601](https://openairdocs.org/sdr/VNAA2026073021601), Jul 27, 2026: Cndair CL6002D24. WARNING MESSAGE. FALSE ACTIVATION. INTERMITTENT RUDDER LIMIT AND XPDR FAIL CAUTION MSG IN FLIGHT WITH INTERMITTENT LOSS OF OIL TEMP, OIL PRESS, CABIN PRESS (N585NN)
- [SDR SWIA2026072576675](https://openairdocs.org/sdr/SWIA2026072576675), Jul 25, 2026: Cndair CL6002C10. WARNING MESSAGE. ILLUMINATED. BLEED AIR DUCT WARNING MESSAGE CLIMBING THROUGH 17,000. GOT AS HIGH AS 19,000 BEFORE INITIATING DESCENT TO BELOW 10,000. (N763SK)
- [SDR YENA2026072400620](https://openairdocs.org/sdr/YENA2026072400620), Jul 24, 2026: Airbus A321271NX. WARNING MESSAGE. ILLUMINATED. FLT 7, JFK-LHR. (ETOPS) AIR BLEED CLASS II MSG ( CLASS II MAINTENANCE MESSAGES DISPLAYED ON ECAM STATUS PAGE OF ECAM SYS (N4073J)
- [SDR SIMA20260721001](https://openairdocs.org/sdr/SIMA20260721001), Jul 21, 2026: Emb ERJ170200LR. WARNING MESSAGE. FALSE ACTIVATION. AVNX MAU 3A FAIL RIGHT AFTER TAKEOFF. CAUSED MANY OTHER EICAS MESSAGES EMERGENCY DECLARED. C/W FIM TASK 31-42-00-810-812 (N329DD)
- [SDR CALA2026072317961](https://openairdocs.org/sdr/CALA2026072317961), Jul 20, 2026: Boeing 737824. WARNING HORN. FALSE ACTIVATION. RTO AT ABOUT 100KTS FOR TO COFIG LIGHT/HORN. ACCOMPLISHED TAKEOFF WARNING SYSTEM TEST IAW AMM 31-51-00-710-803-C2. OPS C (N37287)
- [SDR ABXA20260720326](https://openairdocs.org/sdr/ABXA20260720326), Jul 20, 2026: Boeing 767338. WARNING MESSAGE. ILLUMINATED. DURING TAXI AFTER START R ENG BLEED LIGHT DID NOT EXTINGUISH NO DUCT PRESSURE INDICATED. EICAS MESSAGES "R ENG BLLED" AN (N362CM)
- [SDR YENA2026071700582](https://openairdocs.org/sdr/YENA2026071700582), Jul 14, 2026: Airbus A321271NX. WARNING MESSAGE. ILLUMINATED. FLT 1023, JFK-LAX. (ETOPS). AFTER LANDING, ENG 1 HEAT SYSTEM DEGRADED ( HEAT SYS DEGRAD CAUTIONS ON ECAM E/WD) OPEN (N2165J)
- [SDR ASMF202607220157](https://openairdocs.org/sdr/ASMF202607220157), Jul 13, 2026: Boeing 7878. WARNING MESSAGE. ILLUMINATED. AFTER ENGINE START ELEC C1 PUMP FAULT, WAS CARRY OUT PROCEDURE IAW FAULT CODE DMC-B787-A-24-10-F5-H1A-421A-A (N966AM)
- [SDR QMLA2026071320045](https://openairdocs.org/sdr/QMLA2026071320045), Jul 13, 2026: Bell 407. WARNING LIGHT. FALSE ACTIVATION. XMSN CHIP LIGHT ILLUMINATED IN FLIGHT, INSPECTED AND PERFORMED SERVICEABILITY CHECK. OPERATIONAL CHECK PERFORMED AS WELL (N407AM)
- [SDR R61A2026071200190](https://openairdocs.org/sdr/R61A2026071200190), Jul 12, 2026: Emb ERJ170200LR. WARNING MESSAGE. FALSE ACTIVATION. BLEED 2 OVERPRESSURE RIGHT AFTER TAKE OFF. MAX OBSERVED PSI 110. FOLLOWED QRH PROCEDURE. DECLARED EMERGENCY, LANDED WITH (N233JQ)
- [SDR CALA2026071317742](https://openairdocs.org/sdr/CALA2026071317742), Jul 12, 2026: Boeing 7378. WARNING MESSAGE. FALSE ACTIVATION. TAKEOFF CONFIG LIGHT ON TAKEOFF INTERROGATED OMF FOUND MAINTENANCE MESSAGES 31-53010 AND 27-53256 NOT ACTIVE. PER FIM 27 (N27323)
- [SDR O9IA202607090145](https://openairdocs.org/sdr/O9IA202607090145), Jul 9, 2026: Lear 45LEAR. WARNING MESSAGE. FALSE ACTIVATION. NUMEROUS IN FLIGHT L OR R BLEED LEAK CAS MESSAGES OVER THE PAST TWO YEARS. NOT ABLE TO REPRODUCE THEM ON THE GROUND OR D (N559LM)
- [SDR O9IA2026070900146](https://openairdocs.org/sdr/O9IA2026070900146), Jul 9, 2026: Lear 45LEAR. WARNING MESSAGE. FALSE ACTIVATION. NUMEROUS IN FLIGHT L OR R BLEED LEAK CAS MESSAGES OVER THE PAST TWO YEARS. NOT ABLE TO REPRODUCE THEM ON THE GROUND OR D (N254AL)
- [SDR AALA202608134510](https://openairdocs.org/sdr/AALA202608134510), Jul 7, 2026: Airbus A321211. SDAC. FAULT MESSAGE. AIRCRAFT WAS NOT GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT DIVERTED TO AMA DUE TO THE FLIGHT CREW REPORTING A (N169UW)
- [SDR AALA202607104510](https://openairdocs.org/sdr/AALA202607104510), Jul 7, 2026: Airbus A321211. A/C PACK. OVERTEMP. AIRCRAFT WAS NOT GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT DIVERTED TO AMA DUE TO THE FLIGHT CREW REPORTING A (N169UW)
- [SDR QXEA2026070700155](https://openairdocs.org/sdr/QXEA2026070700155), Jul 4, 2026: Emb ERJ170200LR. WARNING MESSAGE. ILLUMINATED. ON TAKE OFF ROLL FUEL FEED 2 FAULT EICAS MESSAGE DISPLAYED RAN QRH PROCEDURE TAKEOFF REJECTED. REMOVED FROM SERVICE. INF (N646QX)
- [SDR N6WA2026070803](https://openairdocs.org/sdr/N6WA2026070803), Jul 3, 2026: Cndair CL6002C11. WARNING MESSAGE. ILLUMINATED. AFT CARGO OPEN IN FLIGHT. COULD NOT MAINTAIN PRESSURE. PERFORMED PRESSURIZATION CHECK IAW AMM 21-31-00, PRESSURIZATION C (N536GJ)
- [SDR HNA2026F00001](https://openairdocs.org/sdr/HNA2026F00001), Jun 30, 2026: Emb EMB145LR. WARNING MESSAGE. FALSE ACTIVATION. IRREGULARITY REPORTED - ON TAKEOFF ROLL AT APPROX 80 KNOTS CREW REPORT MASTER WARNING FLASHED WITH NO ASSOCIATED EICAS M (N660CL)
- [SDR 9WGA2026062435601](https://openairdocs.org/sdr/9WGA2026062435601), Jun 24, 2026: Boeing 747446F. UNKNOWN. UNKNOWN. ENGINE 2 SHUTDOWN EICAS, CONTINUOUS CLICKING BEHIND FIRE HANDLE PANEL, LESS THAN 68% NO CLICKING, AFTER LANDING CLICKING (N356KD)
- [SDR 2026F00132](https://openairdocs.org/sdr/2026F00132), Jun 16, 2026: Boeing 7378. WARNING LIGHT. ILLUMINATED. ELEC LIGHT TURNS ON DURING GROUND HANDLING. PERFORMED ELEC LIGHT MSG BITE PROCEDURE IAW AMM 24-31-00-740-801. NO FURTHER (N109JS)

All 3,981: https://openairdocs.org/jasc/3150/reports.md

## Other codes in chapter 31

- [JASC 3100](https://openairdocs.org/jasc/3100): Indicating/Recording System (382 reports)
- [JASC 3110](https://openairdocs.org/jasc/3110): Instrument Panel (338 reports)
- [JASC 3120](https://openairdocs.org/jasc/3120): Independent Instruments (209 reports)
- [JASC 3130](https://openairdocs.org/jasc/3130): Data Recorders (Flight/Maintenance) (126 reports)
- [JASC 3140](https://openairdocs.org/jasc/3140): Central Computers (619 reports)
- [JASC 3160](https://openairdocs.org/jasc/3160): Central Display (1,317 reports)
- [JASC 3170](https://openairdocs.org/jasc/3170): Automatic Data (20 reports)
- [JASC 3197](https://openairdocs.org/jasc/3197): Instrument System Wiring (202 reports)

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