# JASC 2721: Rudder Tab Control System

- Type: JASC system/component code (FAA)
- ATA chapter: 27 Flight Controls
- Title in the code table: RUDDER TAB CONTROL SYSTEM
- Service difficulty reports: 686
- FAA code table: https://www.faa.gov/sites/faa.gov/files/JASC_Code.pdf#page=25
- Page: https://openairdocs.org/jasc/2721

## What it covers

The system components and parts of the rudder trim control system, from the cockpit control to the rudder that causes deflection. Does not include hinges or structure, which are filed in JASC code 5543, or the yaw dampers, which are filed in JASC code 2210. Typical parts are actuator, actuator bracket, cable, pulley, chain, rod end, bellcrank, etc.

## Service difficulty reports (686, newest 50)

- [SDR 2026FA0000828](https://openairdocs.org/sdr/2026FA0000828), Oct 12, 2026: Piper PA32R301. ARM. BROKEN. THIS PART CONNECTS THE RUDDER TRIM ACTUATOR TO THE RUDDER BAR ASSEMBLY. THE PART HAS TWO ARMS WELDED TO IT. ONE CONNECTS (N297MA)
- [SDR DALA2026092205285](https://openairdocs.org/sdr/DALA2026092205285), Sep 19, 2026: Airbus A321211. ACTUATOR. FAULTED. ATB - DUE TO EXCESSIVE RUDDER TRIM. REPLACED RUDDER TRIM ACTUATOR (10CC). (LP 9499870 - AIRCRAFT WAS GROUNDED) (N121DZ)
- [SDR ABXA20260827375](https://openairdocs.org/sdr/ABXA20260827375), Aug 27, 2026: Boeing 767232. RUDDER CONTROL. FAULTED. RUDDER RATIO EICAS MESSAGE CAME ON AFTER PUSH BACK. A/C RETURNED TO GATE (BTB) AND MTX GROUNDED A/C MTX RESET SYSTEM AND (N744AX)
- [SDR N6WA2026081203](https://openairdocs.org/sdr/N6WA2026081203), Aug 12, 2026: Cndair CL6002C11. CONTROL UNIT. FAULTED. RUDDER LIMITER CAUTION DURING CLIMB (B1 - 233334, 060059). SWAPPED NR 1 AND NR 2 SSCU. OPS CHECKED GOOD IAW AMM 27-61-05 (N549GJ)
- [SDR SWAA2026051197274](https://openairdocs.org/sdr/SWAA2026051197274), May 5, 2026: Boeing 7377H4. SENSOR. FAULTY. AT FL400; CREW NOTED THAT YOKE WAS DISPLAYED TO RIGHT 3 UNITS; CORRECTED USING RUDDER TRIM. APPROX. 1 MINUTE LATER; CREW (N435WN)
- [SDR SWAA2026051197275](https://openairdocs.org/sdr/SWAA2026051197275), May 5, 2026: Boeing 7377H4. ACTUATOR. FAULTY. AT FL400; CREW NOTED THAT YOKE WAS DISPLAYED TO RIGHT 3 UNITS; CORRECTED USING RUDDER TRIM. APPROX. 1 MINUTE LATER; CREW (N435WN)
- [SDR SWAA2026051197276](https://openairdocs.org/sdr/SWAA2026051197276), May 5, 2026: Boeing 7377H4. PCU. FAULTY. AT FL400; CREW NOTED THAT YOKE WAS DISPLAYED TO RIGHT 3 UNITS; CORRECTED USING RUDDER TRIM. APPROX. 1 MINUTE LATER; CREW (N435WN)
- [SDR ABXA20260427178](https://openairdocs.org/sdr/ABXA20260427178), Apr 27, 2026: Boeing 76731K. ACTUATOR. MALFUNCTIONED. RUDDER RATIO EICAS MESSAGE ON TAXI OUT. REMOVED AND REPLACED RUDDER RATIO CHANGER ACTUATOR IAW B767 AMM 27-21-15 LEAK CH (N1489A)
- [SDR IPXA2026042974070](https://openairdocs.org/sdr/IPXA2026042974070), Apr 19, 2026: Boeing 76734AF. PCA. LEAKING. FAULT- FOUND THE LOWER RUDDER PCA LEAK. (REPLACE) AMM 27-21-02-422-038 REV 147 STEP 5A TO 5H INSTALL LOWER RUDDER PCA (N320UP)
- [SDR COEA2026011501956](https://openairdocs.org/sdr/COEA2026011501956), Jan 14, 2026: Cessna 208B. TRIM SWITCH. FAULTED. REPOSITION FLIGHT 201, PHX-SMF: AIR TURNBACK FULL RIGHT RUDDER TRIM AND ADDITIONAL RIGHT RUDDER REQUIRED TO MAINTAIN STR (N956FE)
- [SDR ABXA20251219349](https://openairdocs.org/sdr/ABXA20251219349), Dec 19, 2025: Boeing 767328. WARNING MESSAGE. ILLUMINATED. DURING TAXI AFTER ENGINE START " RUDDER RATIO" EICAS MESSAGE DISPLAYED.A/C RETURNED TO GATE (BTB) AND MTX GROUNDED A/C M (N1499A)
- [SDR ABXA20251219345](https://openairdocs.org/sdr/ABXA20251219345), Dec 19, 2025: Boeing 767328. WARNING MESSAGE. FALSE ACTIVATION. DURING TAXI OUT AND AFTER ENGINE START "RUDDER RATIO" EICAS MESSAGE DISPLAYED. AIRCRAFT RETURNED TO BLOCKS (BTB). C/W FI (N1499A)
- [SDR ABXA20251215339](https://openairdocs.org/sdr/ABXA20251215339), Dec 15, 2025: Boeing 767306. MODULE. FAULTED. DURING TAXI OUT, RUDDR RATIO ANNUNCIATOR LIGHT ILLUMINATED. AIRCRAFT RETURNED TO BLOCKS (BTB). MAINTENANCE RESET RUDDER  (N1427A)
- [SDR UIEA2025112501323](https://openairdocs.org/sdr/UIEA2025112501323), Nov 25, 2025: Boeing 767324. SWITCH. FAULTED. RUDDER TRIM SWITCH WOULD NOT MOVE TRIM IN FLIGHT(<P>PERFORMED OPERATIONAL TEST OF RUDDER TRIM SYSTEM, ALL CHECKS OK &AMP (N645GT)
- [SDR AALA202512028370](https://openairdocs.org/sdr/AALA202512028370), Nov 17, 2025: Boeing 7378. PTU. FAILED. AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: DURING TAKEOFF AT APPROXIMATELY 100KTS DUE TO A VERY HARD YAW T (N339TP)
- [SDR 8SMA202511050001](https://openairdocs.org/sdr/8SMA202511050001), Oct 5, 2025: Pilats PC1247E. CONTROL PANEL. FAULTED. PILOT REPORTED LOSS OF RUDDER TRIM. NO VOLTAGE NOTED AT A135 PIN R. REMOVED FWD CENTER CONSOLE PANEL WITH TRIM INTERRUPT (N26XM)
- [SDR GTIA2025092939102](https://openairdocs.org/sdr/GTIA2025092939102), Sep 26, 2025: Airbus A320232. ACTUATOR. FAULTED. UNCOMMANDED RUDDER MOVEMENTS BACK AND FORTH. SMALL MOVEMENTS OF PEDALS AND BLUE RUDDER TRIM INDICATOR. NO FAILURE MESSAG (N614NK)
- [SDR 3EJA202509100001](https://openairdocs.org/sdr/3EJA202509100001), Aug 29, 2025: Cessna 560XL. BEARING. WORN. ABNORMAL VIBRATION IN THE CONTROL YOKE. THE VIBRATION INCREASED AS AIRSPEED INCREASED AND DIMINISHED WHEN AIRSPEED WAS D (N845JS)
- [SDR ABXA20250715160](https://openairdocs.org/sdr/ABXA20250715160), Jul 15, 2025: Boeing 767338. WARNING MESSAGE. FALSE ACTIVATION. ON TAXI, RUDDER RATIO ON EICAS MSG., ALL HYDRAULIC PRESSURES NORMAL. AIRCRAFT RETURNED TO BLOCKS. (BTB) ACCOMPLISHED OPE (N364CM)
- [SDR FDEA202507151221](https://openairdocs.org/sdr/FDEA202507151221), Jul 15, 2025: Boeing 7572G5. ACTUATOR. FAILED. AFTER ROTATE THE AIRCRAFT BEGAN TO SHAKE IN THE RUDDER PEDALS THEN ENTERED INTO A SUSTAINED DUTCH ROLL THAT CONTINUED TO (N943FD)
- [SDR DALA2025070805166](https://openairdocs.org/sdr/DALA2025070805166), Jul 7, 2025: Airbus A319114. ACTUATOR. INOPERATIVE. SHIP 3123 RUDDER TRIM CAPTAINS SIDE WOBBLES AND MAKES LOUD CRACKING NOISE WHEN MOVED. FOUND CRACK ON THE TRIM. FOUND PED (N323NB)
- [SDR F3LA202505090230](https://openairdocs.org/sdr/F3LA202505090230), May 9, 2025: Airbus A321211. ACTUATOR. DEFECTIVE. ENTERED ON LP506396 ITEM 1-REF LP506394 ITEM 1 UNCOMMANDED RUDDER MOVEMENT IN FLIGHT FL350 M 0.77 SMOOTH AIR RUDDER TRIM (N708FR)
- [SDR FDEA202411261737](https://openairdocs.org/sdr/FDEA202411261737), Nov 26, 2024: Airbus A300F4605R. TRIM SYSTEM. MALFUNCTIONED. RUDDER TRIM REQUIRED 18 UNITS OF RIGHT TRIM TO FLY COORDINATED AT CRUISE. PER CREW DEBRIEFING AT LAX, THEY EXPLAINED THA (N688FE)
- [SDR 2024FA0000738](https://openairdocs.org/sdr/2024FA0000738), Sep 22, 2024: Cessna 560XL. TRIM TAB. OUT OF ADJUST. ON 22 SEPTEMBER 2024, NASJET AIRCRAFT N142AA MSN 560-5281 RETURNED BACK/FLIGHT (LSZH) DUE TO CREW REPORTED THAT WHEN AIR (N142AA)
- [SDR CALA2024071802061](https://openairdocs.org/sdr/CALA2024071802061), Jul 14, 2024: Boeing 767322. TRIM SYSTEM. UNKNOWN. AFTER TAKEOFF NEEDED ALMOST 8 DEGREES RIGHT RUDDER. TRIED TO ALS O USE AILERON TRIM. NO HELP DEBRIEFIED CREW, BOTH ENGIN (N655UA)
- [SDR F3LA2024062500097](https://openairdocs.org/sdr/F3LA2024062500097), Jun 24, 2024: Airbus A320251N. RUDDER. MISRIGGED. AIRCRAFT WAS GROUNDED DUE TO DISCREPANCY: RUDDER RIGHT TRIM EXCEEDED LIMITS AT 1.5 UNITS AT FL 210 AND .75, A/P ON AND F (N353FR)
- [SDR F3LA2024062600098](https://openairdocs.org/sdr/F3LA2024062600098), Jun 23, 2024: Airbus A320251N. COMPUTER. FAILED. AIRCRAFT WAS GROUNDED. RUDDER TRIM OUT OF LIMITS. ON CLIMB OUT. UNABLE TO DISTINGUISH ANY VIBRATION/YAW DURING CLIMB DUE (N353FR)
- [SDR CALA2024031900789](https://openairdocs.org/sdr/CALA2024031900789), Mar 17, 2024: Boeing 767322. CONTROL MODULE. INTERMITTENT. UNSCHED STAB TRIM EICAS DURING TO ROLL X2 REMOVED AND REPLACED AND TESTED STAB TRIM CONTROL MODULE PER AMM 27-09-00. (N658UA)
- [SDR CVGA20240319001](https://openairdocs.org/sdr/CVGA20240319001), Mar 14, 2024: Beech 400A. SWITCH. DEFECTIVE. ON TAKEOFF HAD AN UN-COMMANDED ROLL TRIM TO THE LEFT AT FULL DEFLECTION. INITIALLY WE WERE UNABLE TO CORRECT THE TRIM TO (N672UP)
- [SDR CALA2024021400419](https://openairdocs.org/sdr/CALA2024021400419), Feb 6, 2024: Boeing 7378. RUDDER PEDAL. TIGHT. RUDDER PEDALS WERE LOCKED OUT IN NEUTRAL POSITION SPOKE TO CREW AND CONFIRMED BOTH PILOTS AND F/O SIDE RUDDER PEDALS WER (N47280)
- [SDR SWIA20240205004](https://openairdocs.org/sdr/SWIA20240205004), Feb 4, 2024: Cndair CL6002C10. TRIM SYSTEM. UNCONTROLLABLE. ON CLIMB OUT RUDDER TRIM WAS REQUIRED WHILE HAND FLYING... RUDER TRIM WENT FULL RIGHT UNABLE TO MANUALLY ADJUST TRIM. AU (N656CA)
- [SDR DXTA2024020210793](https://openairdocs.org/sdr/DXTA2024020210793), Jan 30, 2024: Cessna 560XL. CONTROL CABLE. MISROUTED. DURING FLIGHT DISCONNECTED AUTOPILOT & YAW DAMPER TO ADJUST A SLIGHT RUDDER TRIM INPUT. NOTICED THE INPUT IN CONDITION G (N557QS)
- [SDR ABXA20231227229](https://openairdocs.org/sdr/ABXA20231227229), Dec 27, 2023: Boeing 767231. ACTUATOR. MALFUNCTIONED. RUDDER AND RUDDER TRIM CONTROL SYSTEM: RUDDER TRIM. FAILED TO TRIM IN EITHER DIRECTION A/C RETURNED TO GATE.MAINTENACE G (N650GT)
- [SDR 4DPA2023121700001](https://openairdocs.org/sdr/4DPA2023121700001), Dec 17, 2023: Emb EMB145LR. ACTUATOR. FAILED. CREW REPORTED REPEAT PITCH TRIM BACKUP INOP MESAGE APPEARED AT CRUISE. RETURNED TO DAL. CORR ACTION MX TROUBLESHOT TO BA (N962JX)
- [SDR 2023FA0000816](https://openairdocs.org/sdr/2023FA0000816), Nov 17, 2023: Beech 95. ROD END. SEVERED. FORWARD RUDDER TRIM TAB CONTROL ROD END BROKE. UN CONTROLLED RUDDER TAB CAUSED SEVERE OSCILLATIONS RESULTING IN WINDSHIE (N2024C)
- [SDR 2023FA0000587](https://openairdocs.org/sdr/2023FA0000587), Sep 15, 2023: Amd FALCON20C5. TRIM SYSTEM. DEFECTIVE. DECENDING TO 14,000' RUDDER TRIM RAN FULL RIGHT. RE-TRIMMED AND FOLLOWED EMERGENCY CHECKLIST FOR RUNWAY TRIM. (N541FL)
- [SDR N6WA2023091102](https://openairdocs.org/sdr/N6WA2023091102), Sep 8, 2023: Cndair CL600*. CONTROL SYSTEM. INOPERATIVE. UNCOMMANDED YAW MOTION NOSE RIGHT DURING CLIMB, RUDDER TRIM INDICATED FULL NOSE RIGHT. REMOVED AND REPLACED RUDDER TRIM  (N502GJ)
- [SDR ABXA20230522112](https://openairdocs.org/sdr/ABXA20230522112), May 19, 2023: Boeing 767223. ACTUATOR. LEAKING. RUDDER RATIO EICAS MESSAGE AFTER ENGINE START. AIRCRAFT BACK TO BLOCK AND GROUNDED BY MAINTENANCE. MAINTENANCE REMOVED A (N312AA)
- [SDR F3LA2023050100004](https://openairdocs.org/sdr/F3LA2023050100004), Dec 23, 2022: Airbus A320251N. INDICATOR. INOPERATIVE. RUDDER TRIM INDICATOR ON PEDESTAL INOP. REMOVED AND REPLACED THE RUDDER TRIM INDICATOR IAW AMM 22-62-21-000-001-A & 22-6 (N363FR)
- [SDR FQAR20221207](https://openairdocs.org/sdr/FQAR20221207), Dec 4, 2022: Piper PA28181. ARM. BROKEN. STUDENT REPORTED THAT RUDDER TRIM HAD NO EFFECT, INSPECTED AIRCRAFT AND FOUND CONNECT ARM ASSEM BROKEN, 66661-000 (N819PA)
- [SDR AALA202212061862](https://openairdocs.org/sdr/AALA202212061862), Dec 3, 2022: Airbus A319132. ACTUATOR. DEFECTIVE. AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT RETURNED TO PHL DUE TO RUDDER TRIM AND AILERON OUT OF  (N814AW)
- [SDR FQAR202212080001](https://openairdocs.org/sdr/FQAR202212080001), Dec 2, 2022: Piper PA28181. ARM. BROKEN. STUDENT REPORTED RUDDER TRIM SPINS FREELY WITHOUT ADJUSTMENT, INSPECTED AND FOUND FOUND CONNECT ARM ASSEM BROKEN. (N749PA)
- [SDR FQAR202212080009](https://openairdocs.org/sdr/FQAR202212080009), Nov 12, 2022: Piper PA28181. ARM. BROKEN. DURING AN INSPECTION FOUND CONTROL ARM ASSEMBLY FOR RUDDER TRIM/ RUDDER CABLE CRACKED AT ATTACH POINT., CONNECT ARM ASSE (N424PA)
- [SDR SWIA202266597](https://openairdocs.org/sdr/SWIA202266597), Oct 7, 2022: Cndair CL6002B19. NONE. UNCONTROLLABLE. RUDDER LOCKED UP AT FLIGHT IDLE IN THE LANDING FLARE. NO RUDDER MOVEMENT AVAILABLE. (FLIGHT 4301 - FILED CLOSED) INSPECT (N446SW)
- [SDR CALA2022100602728](https://openairdocs.org/sdr/CALA2022100602728), Oct 6, 2022: Boeing 757224. ACTUATOR. INOPERATIVE. UNABLE TO ADJUST RUDDER TRIM IN FLIGHT- AUTOPILOT ON OR OFF-NO D IFFERENCE GROUND TEST OF RUDDER TRIM SHOWS TRIM INTERMI (N19117)
- [SDR JJBA20221007002](https://openairdocs.org/sdr/JJBA20221007002), Oct 5, 2022: Emb EMB145XR. DAU. INOPERATIVE. RUDDER SYSTEM 1/2 INOPERATIVE DURING DECENT IN DOWN WIND. REMOVED AND REPLACED RUDDER PRESSURE SWITCH 1 AND 2. REMOVED A (N14179)
- [SDR CALA2022100602695](https://openairdocs.org/sdr/CALA2022100602695), Oct 3, 2022: Boeing 757224. ACTUATOR. DEFECTIVE. RUDDER TRIM INOP AFTR T- OFF. NO FM CHKLST. TOMC /DISP CALLED. U SED EMERG AUTH RESET CB C10 OP EWR. MUST REPLACE AND DO (N19136)
- [SDR 9JLA2022100712894](https://openairdocs.org/sdr/9JLA2022100712894), Sep 30, 2022: Cessna 680SOV. ACTUATOR. FAULTED. THE FLIGHT CREW REPORTED THAT THE RUDDER TRIM INDICATOR WAS NOT INDICATING FULL TRAVEL. THE MAINTENANCE PROVIDER FOUND T (N1027P)
- [SDR EBVR20220830](https://openairdocs.org/sdr/EBVR20220830), Aug 30, 2022: Cessna 560XL. NONE. NONE. DURING 48 MONTH INSPECTION FOUND CRACK IN BOTTOM AFT SECTION OF RUDDER TRIM TAB. REPAIRED RUDDER TRIM TAB CRACK PER AQRD (N661QS)
- [SDR DALA2022080905443](https://openairdocs.org/sdr/DALA2022080905443), Aug 9, 2022: Boeing 757251. TRIM SWITCH. INTERMITTENT. SHIP 5638 -ATB- DUE TO LOSS OF RUDDER TRIM CAPABILITIES. CORRECTIVE ACTION: MTC FOUND TRIM SWITCH INTERMITTING. REPLACED (N538US)

All 686: https://openairdocs.org/jasc/2721/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 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 (610 reports)
- [JASC 2750](https://openairdocs.org/jasc/2750): Trailing Edge Flap Control System (10,186 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 (1,978 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 (2,157 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)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.