# JASC 2220: Speed-Attitude Correction System

- Type: JASC system/component code (FAA)
- ATA chapter: 22 Auto Flight
- Title in the code table: SPEED-ATTITUDE CORRECT. SYSTEM
- Service difficulty reports: 118
- FAA code table: https://www.faa.gov/sites/faa.gov/files/JASC_Code.pdf#page=18
- Page: https://openairdocs.org/jasc/2220

## What it covers

The system which automatically maintains safe flight conditions by correcting for effects of speed and out-of-trim conditions by such means as automatic trim, mach trim, or speed stability and mach feel. This includes sensing, computing, actuating, indicating, internal monitoring, warning devices, etc.

## Service difficulty reports (118, newest 50)

- [SDR AALA202502109846](https://openairdocs.org/sdr/AALA202502109846), Feb 8, 2025: Airbus A319112. AUTOPILOT SYS. FAULTED. AIRCRAFT WAS GROUNDED: A/C REQUIRES DOWNGRADE DUE TO MEL 27-06A AUTO FLT RUD TRIM1 FAULT. FLIGHT DIVERTED TO STL AS A PR (N723UW)
- [SDR HALA2023042100091](https://openairdocs.org/sdr/HALA2023042100091), Apr 20, 2023: Airbus A330243. UNKNOWN. UNKNOWN. ATO - ON TAKEOFF ROLL AT APPROX 50 KTS FO SAW AIR SPD TAPE RED. STOPPED A/C ON RWY. RETURNED TO NORMAL. CMS SHOWED ADIRU (N395HA)
- [SDR ASAA2022072239170](https://openairdocs.org/sdr/ASAA2022072239170), Jul 22, 2022: Boeing 737890. AUTOPILOT SYS. WARNING LIGHT. ON DESCENT SPEED TRIM LT ILLUMINATED IT RESET W/MASTER CAUTION RESET. GROUNDED - YES. RESET SPEED TRIM LIGHT OPS CKS GOO (N535AS)
- [SDR ASAA2022052938480](https://openairdocs.org/sdr/ASAA2022052938480), May 29, 2022: Boeing 737890. TRIM SYSTEM. WARNING LIGHT. SPEED TRIM ON OVERHEAD PANEL ILLUMINATED ON MASTER CAUTION RECALL. GROUNDED - YES. RESET SPEED TRIM FAULT IN DFCS IAW B7 (N564AS)
- [SDR 6CBA2022051522211](https://openairdocs.org/sdr/6CBA2022051522211), May 15, 2022: Pilats PC1247E. TRANSMITTER. FAULTY. PROBLEM : DURING TAKEOFF FROM KGAI THE FLIGHT CREW REPORTED THE FOLLOWING "“ INADVERTENT STALL WARNING AND SHAKER ON ROT (N622AF)
- [SDR SIMA20210920003](https://openairdocs.org/sdr/SIMA20210920003), Sep 20, 2021: Emb EMB145LR. NONE. NONE. CA DECLARED EMERGENCY DUE TO UNRELIABLE AIRSPEED. AMBER IAS ON AIRSPEED INDICATOR FOLLOWED BY SPS ADVANCED EICAS MSG. QR (N689EC)
- [SDR IPXA2020082659510](https://openairdocs.org/sdr/IPXA2020082659510), Aug 25, 2020: Boeing 76734AF. FLIGHT DIR. INOPERATIVE. AIR TURNBACK AFTER TAKE OFF FO,S FLT DIR DISAPPEARED. ALSO NO LAND 3 DISPLAYED. IN CLIMB RPDF DISPLAYED VNAV. LPDF DISPL (N347UP)
- [SDR A6WA2019060646646](https://openairdocs.org/sdr/A6WA2019060646646), Jun 4, 2019: Cndair CL6002B19. UNKNOWN. MALFUNCTIONED. 3884 STAB AND MACH TRIM WOULD NOT STAY ENGAGED. FAILED 8 TIMES. RAN QRH EACH TIME. WOULD STAY ENGAGED ABOUT 25 SECONDS. (N439AW)
- [SDR AALA2019060419001](https://openairdocs.org/sdr/AALA2019060419001), May 31, 2019: Boeing 767323. CONTROL PANEL. MALFUNCTIONED. AIRCRAFT NOT GROUNDED: PILOT REPORTS IN ROUTE VNAV DEFAULTED TO ALT HOLD AND SPEED MODE AND WOULD NOT RE-ENGAGE. IN ENGA (N391AA)
- [SDR CA180822010](https://openairdocs.org/sdr/CA180822010), Aug 20, 2018: Cessna 208. GYRO. FAILED. (CAN) DURING CRUISE FLIGHT WITH AUTOPILOT ENGAGED, AUTOPILOT DISCONNECTED AND SMELL OF SMOKE/BURNING WIRES DETECTED AND 
- [SDR REXA2018040900280](https://openairdocs.org/sdr/REXA2018040900280), Apr 9, 2018: Cndair CL6002B19. YAW DAMPER. MALFUNCTIONED. CREW DECLARED EMERGENCY, LEFT WIND FUEL CROSSFLOW RAN CONTINOUSLY AND IMBALANCE GREW TO 600LBS WITH LT WING LIGHT, UPON  (N8974C)
- [SDR REXA2017082100929](https://openairdocs.org/sdr/REXA2017082100929), Aug 21, 2017: Cndair CL6002D24. YAW DAMPER. OSCILLATES. YAW DAMPER UNCOMMANDED OCCILATIONS IN FLIGHT AT 26000 FT, QLH COMPLETED. OCCILATIONS STOPPED WHEN YAW DAMPERS WERE DISEN (N912XJ)
- [SDR FDEA201706141663](https://openairdocs.org/sdr/FDEA201706141663), Jun 14, 2017: Airbus A300B4622R. PROCESSOR. FAILED. DURING CLIMB OUT NR 1 PITCH TRIM CLICKED OFF, NO RESET, NR 2 PITCH TRIM RETURNED TO DEPARTURE. REMOVED AND REPLACED THE  (N749FD)
- [SDR VNAA2015080800012](https://openairdocs.org/sdr/VNAA2015080800012), Aug 8, 2015: Cndair CL6002C10. ACTUATOR. FAILED. CREW REPORTED UNCOMMANDED RUDDER INPUTS AT 34,000 FT. CREW DECLARED AN EMERGENCY AND DIVERTED. BEGAN DESCENT AND PROBLEM (N725PS)
- [SDR FDEA201507212284](https://openairdocs.org/sdr/FDEA201507212284), Jul 21, 2015: Airbus A300B4622. WARNING SYSTEM. FALSE ACTIVATION. BOTH PITCH TRIM LEVERS FAULTED OFF JUST AFTER TAKEOFF, NO RESET. PERFORMED AUTO PILOT LAND IAW AMM 22-40-00-05, CAT III. (N719FD)
- [SDR A6WA201542859](https://openairdocs.org/sdr/A6WA201542859), Jun 21, 2015: Cndair CL6002B19. ACTUATOR. MALFUNCTIONED. FLIGHT 3771, 3990, 3763 INTERMITTENT UNCOMMANDED YAW MOTION IN CRUISE FLIGHT WITH AUTO PILOT ON OR OFF. YD1 DISCONNECTED (N427ZW)
- [SDR ASAA2014092209197](https://openairdocs.org/sdr/ASAA2014092209197), Sep 22, 2014: Boeing 737890. WARNING LIGHT. FALSE ACTIVATION. DURING PREFLIGHT, AFTER YAW DAMPER ENGAGED DURING CHECKLIST OPERATION NOTICED YAW DAMPER OFF LIGHT ILLUMINATED. YAW DAMP (N531AS)
- [SDR CA140813004](https://openairdocs.org/sdr/CA140813004), Aug 9, 2014: Cndair CL6002C10. COMPUTER. FAILED. (CAN) SPEED BUG UNCOMMANDED CHANGE. IN CLIMB PASSING THROUGH FL220, AP ON, FD ON, CLB320, FMS2 CHANGE FROM CLB320 TO CLB
- [SDR VNAA2014071300007](https://openairdocs.org/sdr/VNAA2014071300007), Jul 13, 2014: Cndair CL6002B19. ACTUATOR. MALFUNCTIONED. CREW REPORTED A LIGHT TO OCCASIONALLY MODERATE DUTCH ROLL IN CLIMB AND CRUISE WITH AUTOPILOT ENGAGED AND DISENGAGED. CRE (N249PS)
- [SDR ASAA2014042107552](https://openairdocs.org/sdr/ASAA2014042107552), Apr 21, 2014: Boeing 737890. WARNING LIGHT. FALSE ACTIVATION. SPEED TRIM FAIL LIGHT ILLUMINATED ON OVERHEAD PANEL. ACFT GROUNDED. SPEED TRIM LIGHT EXTINGUISHED, PERFORMED SPEED TRIM  (N562AS)
- [SDR ASAA2014040907495](https://openairdocs.org/sdr/ASAA2014040907495), Apr 9, 2014: Boeing 737990ER. TRIM SYSTEM. MALFUNCTIONED. SPEED TRIM FAIL LIGHT COME ON DURING RECALL. ACFT GROUNDED. COULD NOT DUPLICATE. DFCS SPEED/TRIM SURFACE TEST GRP 60, LI (N431AS)
- [SDR IPXA2014011001275](https://openairdocs.org/sdr/IPXA2014011001275), Jan 8, 2014: Boeing 75724APF. YAW DAMPER. FAULTED. ACFT SUDDENLY STARTED TO YAW SHARPLY, BOTH LT & RT BALL DEFLECTED FULL SCALE IN SLIP INDICATOR. DESCENT TO FL300 & SPEED (N402UP)
- [SDR MASA2014010420834](https://openairdocs.org/sdr/MASA2014010420834), Jan 4, 2014: Cndair CL6002D24. AHRS. MALFUNCTIONED. UNCOMMANDED RUDDER YAW. MAINTENANCE REPLACED AHRS NR 1. (N929LR)
- [SDR REXA2013082601612](https://openairdocs.org/sdr/REXA2013082601612), Aug 26, 2013: Cndair CL6002B19. ACTUATOR. MALFUNCTIONED. YAW DAMPER NR 2 CONTINUES TO DISENGAGE. IT WOULD ENGAGE FOR A MINUTE AND THEN DISENGAGE AGAIN. HAPPENED THREE TIMES ON T (N8659B)
- [SDR REXA2013082401608](https://openairdocs.org/sdr/REXA2013082401608), Aug 24, 2013: Cndair CL6002B19. ACTUATOR. MALFUNCTIONED. EXPERIENCED UNCOMMANDED YAW INPUTS IN CRUISE FLIGHT, AUTO PILOT AND YAW DAMPER ENGAGED. THE YAW DAMPER WAS DISENGAGED TO (N8924B)
- [SDR REXA2013082101604](https://openairdocs.org/sdr/REXA2013082101604), Aug 21, 2013: Cndair CL6002B19. YAW DAMPER. FAILED. YAW DAMPER INOPERATIVE STATUS MESSAGE ILLUMINATED DURING FLIGHT. RESET MULTIPLE TIMES, CONTINUED TO DISCONNECT. REPLACED (N8869B)
- [SDR REXA2013081101574](https://openairdocs.org/sdr/REXA2013081101574), Aug 11, 2013: Cndair CL6002B19. ACTUATOR. FAILED. AT 31000 FT DURING CRUISE, NOTICED UNCOMMANDED RUDDER DEFLECTION IN BOTH DIRECTIONS WITH AND WITHOUT THE AP CONNECTED. B (N8495B)
- [SDR ASAA2013051394798](https://openairdocs.org/sdr/ASAA2013051394798), May 13, 2013: Boeing 737890. CIRCUIT BREAKER. TRIPPED. MACH TRIM FAIL ILLUMINATES ON RECALL. ACFT GROUNDED. ON INITIAL DFCS BITE, FCC A SELF TEST FAILED. FOUND MACH TRIM AC CI (N538AS)
- [SDR ASAA2012120993427](https://openairdocs.org/sdr/ASAA2012120993427), Dec 9, 2012: Boeing 737890. CIRCUIT BREAKER. TRIPPED. AFTER START RECALL MACH TRIM FAIL LIGHT ILLUMINATED. FOUND P18-1 D4 CIRCUIT BREAKER TRIPPED, AFCS SYS A, MACH TRIM DC. R (N517AS)
- [SDR ASAA2012112993385](https://openairdocs.org/sdr/ASAA2012112993385), Nov 29, 2012: Boeing 737890. WARNING LIGHT. FALSE ACTIVATION. ON FINAL DURING MASTER CAUTION RECALL SPEED TRIM FAIL CAUTION LIGHT ILLUMINATED. DURING DDPG PREPARATION SPEED TRIM LIGH (N534AS)
- [SDR ASAA2012091192866](https://openairdocs.org/sdr/ASAA2012091192866), Sep 1, 2012: Boeing 737890. YAW DAMPER. FAILED. YAW DAMPER DISENGAGED TWICE ON APPROACH. (APPROX 1500 & 300AGL) ACFT GROUNDED. NR 1 SMYD SHOWS YD SERVO LOOP FAULT WITH  (N558AS)
- [SDR REXA2012070701057](https://openairdocs.org/sdr/REXA2012070701057), Jul 7, 2012: Cndair CL6002B19. SWITCH. INOPERATIVE. MACH TRIM WILL NOT ENGAGE. REMOVED AND REPLACED MACH TRIM ENGAGE SWITCH AND OPS CHECKS GOOD IAW AMM 22-21-00. (N8907A)
- [SDR REXA201200849](https://openairdocs.org/sdr/REXA201200849), Jun 18, 2012: Cndair CL6002B19. ACTUATOR. INOPERATIVE. YAW DAMPNER NR 2 WILL NOT ENGAGE. REMOVED AND REPLACED YAW DAMPNER ACTUATOR IAW AMM 22-22-01. OPS CHECKED GOOD. (N8488D)
- [SDR WRNA201200006](https://openairdocs.org/sdr/WRNA201200006), May 11, 2012: Airbus A300B4203. GYRO. UNSERVICEABLE. BOTH NR 1 & NR 2 YAW DAMPERS WOULD NOT ENGAGE. AIRCRAFT RETURNED TO AIRFIELD. LANDING NORMAL. MX FOUND NR 1 & NR 2 YAW R (N821SC)
- [SDR UALA2012040202038](https://openairdocs.org/sdr/UALA2012040202038), Apr 2, 2012: Boeing 75721B. SERVO VALVE. MALFUNCTIONED. RIGHT YAW INOPERATIVE LIGHT ON DURING CLIMBOUT. SWITCH OFF PER CHECKLIST. ACCOMPLISHED YAW DAMPER SYSTEM BITE PER FIM, R (N589UA)
- [SDR ASAA1159750](https://openairdocs.org/sdr/ASAA1159750), Jun 4, 2011: Boeing 737890. TRIM SYSTEM. MALFUNCTIONED. "SPEED TRIM FAIL" LIGHT ON RECALL. ACCOMPLISHED SPEED TRIM OPERATIONAL CHECK IAW AMM 22-11-00-740-801, NO DEFECTS NOTED. (N596AS)
- [SDR CA110331009](https://openairdocs.org/sdr/CA110331009), Mar 28, 2011: Cndair CL6002B19. YAW DAMPER. FAILED. (CAN) CREW REPORTING ISSUE WITH FLIGHT CONTROL. EMERGENCY WAS DECLARED AND ACFT LANDED WITHOUT FURTHER INCIDENT. IT WAS 
- [SDR CA100826010](https://openairdocs.org/sdr/CA100826010), Aug 25, 2010: Airbus A320211. SCREW. SHEARED. (CAN) CREW REPORTED LOW YELLOW SYSTEM HYDRAULIC FLUID QUANTITY. DURING THE SUBSEQUENT MAINTENANCE INVESTIGATION FOR THIS
- [SDR FDEA200912084382](https://openairdocs.org/sdr/FDEA200912084382), Dec 8, 2009: Airbus A310324. COMPUTER. MALFUNCTIONED. ON CLIMB OUT, FLAPS AND SLATS UP, CAPT MAX SPEED INDICATOR (ZIPPER) REMAINED AT 245 KTS. F/O SPD LIMIT REMAINED "ON". R  (N808FD)
- [SDR AALA200802493A](https://openairdocs.org/sdr/AALA200802493A), Nov 9, 2008: Boeing 757223. MODULE. FAULTED. LAX INFLIGHT - MACH SPEED TRIM INDICATIONS AT 16000 FEET. AUTOPILOT WAS OFF AIRSPEED ABOUT 270 KNOTS INDICATED AIR SPEED (N187AN)
- [SDR BJNA032908001](https://openairdocs.org/sdr/BJNA032908001), Mar 29, 2008: Boeing 737400. SPRING. BROKEN. BJNA080401- ALTITUDE HOLD INTERMITTENT. FOUND ELEVATOR LOAD FEEL CENTERING SPRING (OUTER) BROKEN. REMOVED AND REPLACED E (N43XA)
- [SDR FDKA200709448](https://openairdocs.org/sdr/FDKA200709448), Sep 7, 2007: Emb EMB145LR. SERVO. FAILED. FDM FLT 6201 FLL - YAW DAMP/AUTOPILOT FAIL. REMOVED AND REPLACED AILERON SERVO. (N831MJ)
- [SDR 07FDEA03258](https://openairdocs.org/sdr/07FDEA03258), Aug 30, 2007: Boeing 727233. ACTUATOR. FAILED. CLIMBING THRU FL190 A/P CRUSE TRIM WOULD NOT WORK IN EITHER DIRECTION, NOR WOULD THE MAIN ELC TRIM WORK IN THE NOSE DOWN (N282FE)
- [SDR UIEA200700237](https://openairdocs.org/sdr/UIEA200700237), Jun 3, 2007: Boeing 747243B. ALTIMETER. OUT OF LIMITS. A A/P PORPOISED 200-300' ABOVE AND BELOW SELECTED ALTITUDE AT FL 410 IN CRUISE. A/P OK. TRANSFERRED TO DMI M07-117IAW ME (N517MC)
- [SDR 070041](https://openairdocs.org/sdr/070041), Feb 16, 2007: Doug DC982. DISPLAY. UNKNOWN. FLIGHT 715 SFB/LAN - THE FLIGHT CREW REPORTED; DURING TAKEOFF ROLL "F/S FAIL" INTERMITTENTLY APPEARED ON BOTH PRIMARY FL (N887GA)
- [SDR AMW082646](https://openairdocs.org/sdr/AMW082646), Feb 14, 2007: Beech 1900D. DPU. WILL NOT ARM. AFTER T/O, THE FOS FEES COMPARE (PUSH TO RESET) BUTTON ILLUMINATED AND WOULD NOT RESET. AC RETURNED TO FIELD WITH NO OTH (N161YV)
- [SDR 07FDEA00245](https://openairdocs.org/sdr/07FDEA00245), Feb 2, 2007: Boeing 727277. SERVO. UNKNOWN. AFTER DEPARTING MIA WHILE CLEANING UP AIRCRAFT STAB CRUISE TRIM CIRCUIT BREAKER POPPED. CLIMBING THROUGH 17500 IT WAS DI (N491FE)
- [SDR DXTA200601705](https://openairdocs.org/sdr/DXTA200601705), Nov 2, 2006: Cessna 750. COMPUTER. INOPERATIVE. DURING TAKEOFF ROLL, MACH TRIM FAILED. REPLACED NR 2 IC800 + OP'S IAW MM 34-25-01. (N952QS)
- [SDR DXTA200601652](https://openairdocs.org/sdr/DXTA200601652), Oct 13, 2006: Cessna 750. AIR DATA MODULE. FAILED. AT SPEEDS ABOVE .82M AIRCRAFT YAW LT AND RT UPPER YAW DAMPNER APPEARS NOT TO MOVE. UPPER AND LOWER YD SEVERED SELECTED T (N978QS)
- [SDR PIDA06037](https://openairdocs.org/sdr/PIDA06037), Apr 4, 2006: Boeing 737228. COUPLER. INOPERATIVE. MACH TRIM IS INOP. REPLACED MACH TRIM COUPLER AND OPS CHECKED PER MM 22-21-0. (N251TR)

All 118: https://openairdocs.org/jasc/2220/reports.md

## Other codes in chapter 22

- [JASC 2200](https://openairdocs.org/jasc/2200): Auto Flight System (567 reports)
- [JASC 2210](https://openairdocs.org/jasc/2210): Autopilot System (4,014 reports)
- [JASC 2211](https://openairdocs.org/jasc/2211): Autopilot Computer (586 reports)
- [JASC 2212](https://openairdocs.org/jasc/2212): Altitude Controller (29 reports)
- [JASC 2213](https://openairdocs.org/jasc/2213): Flight Controller (148 reports)
- [JASC 2214](https://openairdocs.org/jasc/2214): Autopilot Trim Indicator (9 reports)
- [JASC 2215](https://openairdocs.org/jasc/2215): Autopilot Main Servo (267 reports)
- [JASC 2216](https://openairdocs.org/jasc/2216): Autopilot Trim Servo (128 reports)
- [JASC 2230](https://openairdocs.org/jasc/2230): Auto Throttle System (1,084 reports)
- [JASC 2250](https://openairdocs.org/jasc/2250): Aerodynamic Load Alleviating (15 reports)
- [JASC 2297](https://openairdocs.org/jasc/2297): Auto Flight System Wiring (149 reports)

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