# JASC 6700: Rotorcraft Flight Control - Type: JASC system/component code (FAA) - ATA chapter: 67 Rotors Flight Control - Title in the code table: ROTORCRAFT FLIGHT CONTROL - Service difficulty reports: 317 - FAA code table: https://www.faa.gov/sites/faa.gov/files/JASC_Code.pdf#page=59 - Page: https://openairdocs.org/jasc/6700 ## What it covers For general reports of rotorcraft control systems with insufficient information to file in a more specific 6700 JASC series code; or for reports which affect both main and tail rotor control systems. Avoid excessive use of this code if possible. ## Service difficulty reports (317, newest 50) - [SDR QR9R2026100500001](https://openairdocs.org/sdr/QR9R2026100500001), Oct 5, 2026: Bolkms BK117C2. ACTUATOR. FAILED. A/C FAILED AUTOPILOT TEST; YAW SAS AND BACKUP SAS ACTUATORS. A TEST FLIGHT EVAL FOUND AUTOPILOT FAILS SELFTEST. INDICATE - [SDR QR9R2026093000001](https://openairdocs.org/sdr/QR9R2026093000001), Sep 30, 2026: Bolkms BK117C2. ACTUATOR. FAILED. SAS A/P CUT FAILURE; YAW SAS AND BACKUP SAS ACTUATOR FAILURE DURING START RUNUP. A TEST FLIGHT EVAL FOUND DURING AUTOPIL - [SDR QR9R2026092500001](https://openairdocs.org/sdr/QR9R2026092500001), Sep 25, 2026: Bolkms BK117C2. ACTUATOR. FAILED. IN FLIGHT TRIM ACTUATOR FAIL MESSAGE WITH BACK UP SAS AND YAW TRIM CIRCUIT BREAKER POP. UNABLE TO RESET. DURING RECOVERY - [SDR QR9R2026092200002](https://openairdocs.org/sdr/QR9R2026092200002), Sep 22, 2026: Bolkms BK117C2. ACTUATOR. FAILED. ACTUATOR CAUTION LIGHT ILLUMINATED CENTER POSITION ON THE CAD WITH CORRESPONDING AMBER Y ON PFD. TROUBLESHOOTING REVEALE - [SDR QR9R2026091800001](https://openairdocs.org/sdr/QR9R2026091800001), Sep 18, 2026: Bolkms BK117C2. ACTUATOR. FAILED. ACTUATOR CAUTION ILLUMINATED AND WAS STILL PRESENT AFTER SHUTTING DOWN THE ACFT AND RE-STARTING. DURING TEST FLIGHT EVAL - [SDR 2026F00200](https://openairdocs.org/sdr/2026F00200), Sep 2, 2026: Bell 212. AMPLIFIER. FAILED. AS THE COPILOT BROUGHT THE AIRCRAFT TO HOVER, A LATERAL OSCILLATION BEGAN TO DEVELOP. WHILE THE COPILOT STILL HAD CONTRO (N815SS) - [SDR QR9R2026090100001](https://openairdocs.org/sdr/QR9R2026090100001), Sep 1, 2026: Bolkms BK117C2. ACTUATOR. FAILED. AP1/TRIM FAIL DURING AUTOPILOT TEST, WITH "P" INDICATOR. REMOVED AND REPLACED DUPLEX TRIM ACTUATOR IAW AMM 67-14-00, 4-1 - [SDR QR9R2026032400001](https://openairdocs.org/sdr/QR9R2026032400001), Mar 24, 2026: Bolkms BK117C2. ACTUATOR. FAILED. AUTOPILOT TEST WOULD NOT PASS, KEPT GETTING TRIM LIGHT FOR BOTH AP1 & AP2. REMOVED AND REPLACED YAW TRIM ACTUATOR IAW AM - [SDR QR9R2026030400001](https://openairdocs.org/sdr/QR9R2026030400001), Mar 4, 2026: Bolkms BK117C2. ACTUATOR. FAILED. DURING AP TESTS, AP1 & TRIM WITH AMBER Y ON PFD WAS ILLUMINATED. REMOVED AND REPLACED YAW TRIM ACTUATOR IAW AMM 67-14-00 - [SDR QR9R2026030200001](https://openairdocs.org/sdr/QR9R2026030200001), Mar 2, 2026: Bolkms BK117C2. ACTUATOR. FAILED. DURING RUN-UP, AP TEST FAILED MULTIPLE ATTEMPTS. Y AP1 AND TRIM LIGHTS ILLUMINATED. REMOVED AND REPLACED YAW TRIM ACTUAT - [SDR QR9R2025103000002](https://openairdocs.org/sdr/QR9R2025103000002), Oct 30, 2025: Bolkms BK117C2. ACTUATOR. WARNING LIGHT. YAW ACTUATOR CAUTION LIGHT ILLUMINATED AT TAKEOFF AND WOULD NOT EXTINGUISH. A TEST FLIGHT EVAL FOUND DURING TAKEOFF TO A - [SDR QR9R2025102400002](https://openairdocs.org/sdr/QR9R2025102400002), Oct 24, 2025: Bolkms BK117C2. ACTUATOR. FAILED. TRIM ACTUATOR FAILURE AT TAKEOFF. REMOVED AND REPLACED YAW TRIM ACTUATOR IAW AMM 67-14-00, 4-1; MOC OK. - [SDR QR9R2025102400001](https://openairdocs.org/sdr/QR9R2025102400001), Oct 24, 2025: Bolkms BK117C2. CONTROL ROD. NOT ENTERED. THE CONTROL ROD ASSEMBLY (LIMITED LIFE COMPONENT) WAS RECEIVED FROM AIRBUS AS OVERHAULED AND TIME SINCE NEW NOT AVAILABL - [SDR QR9R2025101000001](https://openairdocs.org/sdr/QR9R2025101000001), Oct 10, 2025: Bolkms BK117C2. CONTROL ROD. NOT REPORTED. CONTROL ROD ASSEMBLY (LIFE LIMITED COMPONENT) WAS RECEIVED FROM SUPPLY WITH COMPONENT TIME SINCE NEW UNKNOWN. - [SDR QR9R2025100900005](https://openairdocs.org/sdr/QR9R2025100900005), Oct 9, 2025: Bolkms BK117C2. ACTUATOR. FAULTED. ACTUATOR CAUTION APPEARED IN FLIGHT, ACCOMPANIED BY "Y" ON THE PFD. REMOVED AND REPLACED SEMA ACTUATOR; T/P MOC SUCCESSF - [SDR QR9R2025100900001](https://openairdocs.org/sdr/QR9R2025100900001), Oct 9, 2025: Bolkms BK117C2. ACTUATOR. WARNING LIGHT. ACTUATOR LIGHT ON CAD, P ON PFD DURING HOVER TAXI. SUBBED IN KNOWN GOOD #2 PITCH SEMA AND FAULT WAS CORRECTED. REPLACED - [SDR QR9R2025092400003](https://openairdocs.org/sdr/QR9R2025092400003), Sep 24, 2025: Bolkms BK117C2. ACTUATOR. FAILED. YAW ACTUATOR CAUTION LIGHT ON INFLIGHT. TEST FLIGHT EVAL FOUND ACTUATOR FAILED IN THE YAW AXIS DURING AP TEST. REMOVED A - [SDR QR9R2025082100001](https://openairdocs.org/sdr/QR9R2025082100001), Aug 21, 2025: Bolkms BK117C2. ACTUATOR. FAILED. ABORTED TAKEOFF DUE TO TAIL ROTOR PEDALS HAVE EXCESSIVE FREEPLAY AT IDLE AND WITH ENGINES NOT RUNNING. TROUBLESHOOTING R - [SDR QR9R2025081400001](https://openairdocs.org/sdr/QR9R2025081400001), Aug 14, 2025: Bolkms BK117C2. ACTUATOR. FAILED. ACTUATOR WARNING ILLUMINATED IN FLIGHT. YAW TRIM FAILED IN FLIGHT. REMOVED AND REPLACED SEMA ACTUATOR IAW AMM 67-20-00, - [SDR QR9R2025073100001](https://openairdocs.org/sdr/QR9R2025073100001), Jul 31, 2025: Bolkms BK117C2. ACTUATOR. NO TEST. AP1/YAW TRIM FAILED ON AP TEST DURING START RUN-UP. A TEST FLIGHT EVAL REVEALED AP1 AND TRIM APPEAR ON CAD, "Y" APPEARS - [SDR QR9R2025052900001](https://openairdocs.org/sdr/QR9R2025052900001), May 29, 2025: Bolkms BK117C2. ACTUATOR. FAILED. AUTOPILOT TEST FAILED. PERFORMED MULTIPLE TEST WITH SAME RESULT. AP2 AND TRIM CAUTION WOULD REMAIN ILLUMINATED AFTER TES - [SDR QR9R2025051300001](https://openairdocs.org/sdr/QR9R2025051300001), May 13, 2025: Bolkms BK117C2. BELLCRANK. RATCHETING. AN OPERATIONAL CHECK REVEALED THE BELLCRANK BEARING HAD EXCESSIVE RATCHETING. PART WAS RECEIVED NEW FROM SUPPLY. - [SDR QR9R2025040300001](https://openairdocs.org/sdr/QR9R2025040300001), Apr 3, 2025: Bolkms BK117C2. ACTUATOR. FAILED. Y TRIM FAILED IN HOVER. UNABLE TO GET IT TO STAY OFF IN LEVEL 4 AFTER TWO AIRBUS RESETS. REMOVED AND REPLACED YAW TRIM M - [SDR QR9R2025031700006](https://openairdocs.org/sdr/QR9R2025031700006), Mar 17, 2025: Bolkms BK117C2. ACTUATOR. FAILED. DURING AP TEST, YAW AND SAS BACKUP WOULD NOT EXTINGUISH. DURING TROUBLESHOOTING, FOUND A VALID SIGNAL IN ON THE YAW SEMA - [SDR QR9R2025031700005](https://openairdocs.org/sdr/QR9R2025031700005), Mar 17, 2025: Bolkms BK117C2. ACTUATOR. FAILED. DIRECTIONAL CONTROL ACTUATOR FAILED IN FLIGHT WHILE CONDUCTING A VMC APPROACH. CREW RETURNED TO AIRFIELD AND CONDUCTED A - [SDR QR9R2025031700001](https://openairdocs.org/sdr/QR9R2025031700001), Mar 17, 2025: Bolkms BK117C2. ACTUATOR. FAILED. #1 YAW ACTUATOR FAILED DURING THE AUTO PILOT TEST. AVIONICS DID AIRBUS RESET BUT CONTINUED TO FAIL. DURING TROUBLESHOOTI - [SDR QR9R2025021900001](https://openairdocs.org/sdr/QR9R2025021900001), Feb 19, 2025: Bolkms BK117C2. ACTUATOR. BINDING. AFTER STARTING THE NO.2 ENGINE SEVERAL SECONDS AFTER THE STARTER DROPPED OUT, FELT A METALLIC CLUNK IN THE PEDALS. THERE - [SDR QR9R202411010001](https://openairdocs.org/sdr/QR9R202411010001), Nov 1, 2024: Bolkms BK117C2. ACTUATOR. FAULTED. TRIM CAUTION MESSAGE DISPLAYS WITH MODERATE POWER CHANGES. OCCASIONALLY THE TRIM CAUTION MESSAGE WILL DISPLAY CONTINUOUS - [SDR QR9R2024100800003](https://openairdocs.org/sdr/QR9R2024100800003), Oct 8, 2024: Bolkms BK117C2. ACTUATOR. NO TEST. AP1 ACTUATOR CAUTION APPEARED AFTER AP TEST. AVIONICS COULD NOT RESET AFTER 3 ATTEMPTS. ROLL SEMA POSITION 2 FAILED CHEC - [SDR QR9R2024100200001](https://openairdocs.org/sdr/QR9R2024100200001), Oct 2, 2024: Bolkms BK117C2. ACTUATOR. WARNING MESSAGE. DURING RUN-UP, AP TEST FAILED AND WAS RESET BY AVIONICS. AFTER RESET, ACTUATOR CAUTION LIGHT ILLUMINATED DURING TAXI FOR - [SDR QMLA2024091620115](https://openairdocs.org/sdr/QMLA2024091620115), Sep 16, 2024: Urocop EC135T2. PEDAL. CRACKED. DURING THE 1000HR AIRFRAME INSPECTION, A CRACK WAS FOUND ON THE PILOT LH TAIL ROTOR PEDAL ON THE UPPER PART OF THE INBOA (N953AL) - [SDR 2024FA0000706](https://openairdocs.org/sdr/2024FA0000706), Sep 6, 2024: Skrsky S58JT. DRIVE SHAFT. CRACKED. DURING GROUND RUN A HIGH FREQUENCY VIBRATION WAS NOTICED BY THE PILOT AND THE AIRCRAFT WAS SHUTDOWN. DURING SHUTDOWN A M (N4247V) - [SDR QR9R2024090400002](https://openairdocs.org/sdr/QR9R2024090400002), Sep 4, 2024: Bolkms BK117C2. ACTUATOR. FAILED. ACTUATOR FAILED IN FLIGHT. REMOVED AND REPLACED SEMA ACTUATOR IAW AMM 67-20-00, 4-8; T/F SUCCESSFULLY COMPLETED. - [SDR QR9R2024082800002](https://openairdocs.org/sdr/QR9R2024082800002), Aug 28, 2024: Bolkms BK117C2. ACTUATOR. WARNING MESSAGE. ACTUATOR CAUTION ILLUMINATED ON CAD IN FLIGHT WITH AMBER "Y" ON PFD. REMOVED AND REPLACED SEMA ACTUATOR IAW AMM 67-20-00 - [SDR M3XA20240816012](https://openairdocs.org/sdr/M3XA20240816012), Aug 16, 2024: Bolkms BK117C2. TUBE. UNSERVICEABLE. DURING THE FIRST 800 HOUR INSPECTION IT WAS DISCOVERED THAT THE XMSN SPACER TUBE HAD NUMEROUS CRACKS AND IS DEFINITELY U (N945MT) - [SDR QR9R2024081500001](https://openairdocs.org/sdr/QR9R2024081500001), Aug 15, 2024: Bolkms BK117C2. ACTUATOR. ILLUMINATED. DURING FLIGHT, ACTUATOR LIGHT ILLUMINATED ON CAD. TESTFLIGHT EVAL REVEALED ACTUATOR CAUTION ILLUMINATED ON CAD IN FLIGHT - [SDR QR9R2024080900001](https://openairdocs.org/sdr/QR9R2024080900001), Aug 9, 2024: Bolkms BK117C2. ACTUATOR. FAILED. ABORTED TAKE-OFF DUE TO SAS BACKUP LIGHT WOULD NOT EXTINGUISH. DURING TROUBLESHOOTING, FOUNDP1 SEMA TO BE BAD. REMOVED A - [SDR QR9R2024080800002](https://openairdocs.org/sdr/QR9R2024080800002), Aug 8, 2024: Bolkms BK117C2. ACTUATOR. FAILED. ACTUATOR FAILURE DURING LANDING. A TEST FLIGHT EVAL REVEALED "Y" DISPLAYED ON PFDS AND "YAWEMA INVAL" DISPLAYED ON VEMD - [SDR QR9R2024080700002](https://openairdocs.org/sdr/QR9R2024080700002), Aug 7, 2024: Bolkms BK117C2. ACTUATOR. FAILED. ACTUATOR CAUTION IN FLIGHT. AVIONICS RESET, AND ATTEMPTED FLIGHT AGAIN. ACTUATOR CAUTION ILLUMINATED AGAIN IN FLIGHT. TE - [SDR QR9R2024070800001](https://openairdocs.org/sdr/QR9R2024070800001), Jul 8, 2024: Bolkms BK117C2. BELLCRANK. RATCHETING. BELLCRANK ASSEMBLY WAS RECEIVED NEW FROM SUPPLY. MAINTENANCE DETECTED BELLCRANK ASSY BEARING WAS RATCHETING AND BINDING - [SDR 2024FA0000478](https://openairdocs.org/sdr/2024FA0000478), Jun 25, 2024: Boeing CH47A. LINK. CORRODED. DURING RIG OF FLIGHT CONTROLS NOTED OBSTRUCTION IN ROD-END THREAD. PERFORMED BORESCOPE AND FOUND HEAVY CORROSION IN THRE (N43CU) - [SDR 2024FA0000477](https://openairdocs.org/sdr/2024FA0000477), Jun 25, 2024: Boeing CH47A. LINK. CORRODED. DURING RIG OF FLIGHT CONTROLS NOTED OBSTRUCTION IN ROD-END THREAD. PERFORMED BORESCOPE AND FOUND HEAVY CORROSION IN THRE (N43CU) - [SDR 2024FA0000476](https://openairdocs.org/sdr/2024FA0000476), Jun 25, 2024: Boeing CH47A. LINK. CORRODED. DURING RIG OF FLIGHT CONTROLS NOTED OBSTRUCTION IN ROD-END THREAD. PERFORMED BORESCOPE AND FOUND HEAVY CORROSION IN THRE (N43CU) - [SDR 2024FA0000475](https://openairdocs.org/sdr/2024FA0000475), Jun 25, 2024: Boeing CH47A. LINK. CORRODED. DURING RIG OF FLIGHT CONTROLS NOTED OBSTRUCTION IN ROD-END THREAD. PERFORMED BORESCOPE AND FOUND HEAVY CORROSION IN THRE (N43CU) - [SDR 2024FA0000473](https://openairdocs.org/sdr/2024FA0000473), Jun 25, 2024: Boeing CH47A. LINK. CORRODED. DURING RIG OF FLIGHT CONTROLS NOTED OBSTRUCTION IN ROD-END THREAD. PERFORMED BORESCOPE AND FOUND HEAVY CORROSION IN THRE (N43CU) - [SDR 2024FA0000472](https://openairdocs.org/sdr/2024FA0000472), Jun 25, 2024: Boeing CH47A. LINK. CORRODED. DURING RIG OF FLIGHT CONTROLS NOTED OBSTRUCTION IN ROD-END THREAD. PERFORMED BORESCOPE AND FOUND HEAVY CORROSION IN THRE (N43CU) - [SDR 2024FA0000471](https://openairdocs.org/sdr/2024FA0000471), Jun 25, 2024: Boeing CH47A. LINK. CORRODED. DUE TO CORROSION ON ASSOCIATED LINK, PERFORMED BORESCOPE AND FOUND HEAVY CORROSION IN THREADS. THIS IS CONCURRENT WITH C (N43CU) - [SDR 2024FA0000468](https://openairdocs.org/sdr/2024FA0000468), Jun 25, 2024: Boeing CH47A. LINK. CORRODED. DUE TO CORROSION ON ASSOCIATED LINK, PERFORMED BORESCOPE AND FOUND HEAVY CORROSION IN THREADS. THIS IS CONCURRENT WITH C (N43CU) - [SDR 2024FA0000467](https://openairdocs.org/sdr/2024FA0000467), Jun 25, 2024: Boeing CH47A. LINK. CORRODED. DUE TO CORROSION FOUND ON ASSOCIATED LINK, PERFORMED BORESCOPE AND FOUND HEAVY CORROSION IN THREADS. THIS IS CONCURRENT (N43CU) - [SDR 2024FA0000466](https://openairdocs.org/sdr/2024FA0000466), Jun 25, 2024: Boeing CH47A. LINK. CORRODED. DURING RIG OF FLIGHT CONTROLS NOTED OBSTRUCTION IN ROD-END THREAD. PERFORMED BORESCOPE AND FOUND HEAVY CORROSION IN THRE (N43CU) All 317: https://openairdocs.org/jasc/6700/reports.md ## Airworthiness concern sheets (1) - [AIR770-2026-05-R-6700-ACS](https://openairdocs.org/acs/AIR770-2026-05-R-6700-ACS): Separated Push-Pull Tube. Issued May 15, 2026 ## Other codes in chapter 67 - [JASC 6710](https://openairdocs.org/jasc/6710): Main Rotor Control (1,151 reports) - [JASC 6711](https://openairdocs.org/jasc/6711): Tilt Rotor Flight Control (11 reports) - [JASC 6720](https://openairdocs.org/jasc/6720): Tail Rotor Control System (852 reports) - [JASC 6730](https://openairdocs.org/jasc/6730): Rotorcraft Servo System (647 reports) - [JASC 6797](https://openairdocs.org/jasc/6797): Rotors Flight Control System Wiring (9 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.