# JASC 7602: Mixture Control - Type: JASC system/component code (FAA) - ATA chapter: 76 Engine Controls - Title in the code table: MIXTURE CONTROL - Service difficulty reports: 144 - FAA code table: https://www.faa.gov/sites/faa.gov/files/JASC_Code.pdf#page=66 - Page: https://openairdocs.org/jasc/7602 ## What it covers The control for adjusting fuel-air mixture in piston engines. Includes linkage from the cockpit lever to the carburetor or fuel injector servo but does not include the arm on mixture control shafts. Typical parts are cable, rod, bellcrank, rod end, housing, clamp and cockpit control lever/knob. ## Service difficulty reports (144, newest 50) - [SDR 2020FA0000530](https://openairdocs.org/sdr/2020FA0000530), Dec 10, 2020: Cessna 172. CONTROL CABLE. BINDING. APPROXIMATELY 20 HOURS AFTER ANNUAL, THE VERNIER MIXTURE CONTROL BECAME VERY STIFF. THERE WERE NO KNOWN ANOMALIES OR WEA (N5907E) - [SDR CA190725013](https://openairdocs.org/sdr/CA190725013), Jul 24, 2019: Robsin R22BETA. WIRE. BROKEN. (CAN) MIXTURE CABLE INNER WIRE BROKE OFF ABOUT 1 FOOT AHEAD OF MIXTURE LEVER ON CARBURETOR. (TC# 20190725013) - [SDR CA190725010](https://openairdocs.org/sdr/CA190725010), Jul 23, 2019: Robsin R22BETA. CABLE. DAMAGED. (CAN) MIXTURE CABLE INNER WIRE BROKE OFF ABOUT 1 FOOT AHEAD OF MIXTURE LEVER ON CARBURETOR (TC# 20190725010) - [SDR 2019FA0000179](https://openairdocs.org/sdr/2019FA0000179), May 16, 2019: Mooney M20F. ROD END. SEPARATED. DURING CRUISE FLIGHT, THE MIXTURE CONTROL ROD END SEPARATED FROM THE PRESSURE CARBURETOR CONTROL ARM, WHICH RESULTED IN (N3555N) - [SDR 2018FA0000514](https://openairdocs.org/sdr/2018FA0000514), Dec 11, 2018: CONTROL CABLE. FAILED. WE HAVE INSTALLED 6 EA OF THE MIXTURE CONTROL CABLES. AFTER A SHORT TIME IN SERVICE THE VERNIE CONTROL WOULD NOT WORK PR - [SDR DALA2016050803957](https://openairdocs.org/sdr/DALA2016050803957), May 8, 2016: Doug MD9030. CONTROL MODULE. MALFUNCTIONED. THE CREW ACCOMPLISHED AN AIR TURN BACK DUE TO LT, NOSE AND RT RED LG "UNSAFE" INDICATIONS ILLUMINATED. WHEN THE LANDING (N925DN) - [SDR 2015FA0000023](https://openairdocs.org/sdr/2015FA0000023), Jan 22, 2015: Beech F33A. LOCK NUT. STRIPPED. SHORTLY AFTER TAKEOFF, HAD A REDUCTION IN FUEL FLOW, LANDED WITHOUT INCIDENT. UPON INSPECTION IT WAS NOTICED THAT THE RE (N5585Y) - [SDR FQAR201501102005](https://openairdocs.org/sdr/FQAR201501102005), Jan 11, 2015: Piper PA28181. CABLE. SEPARATED. THE IP & SP WERE HAD RETURNED TO THE APRON AFTER AN UNEVENTFUL FLIGHT. THE SP WAS ACTIONING THE ENGINE SHUTDOWN CHECKLIS (N4166H) - [SDR FQAR20141215048](https://openairdocs.org/sdr/FQAR20141215048), Dec 13, 2014: Piper PA28181. CONTROL CABLE. SEPARATED. DURING A ROUTINE ENGINE INSPECTION, A TECH NOTED THE RUBBER BOOT COVERING THE SWAGE ON THE END OF THE MIXTURE CONTROL CA (N297PA) - [SDR 4DSR201411240001](https://openairdocs.org/sdr/4DSR201411240001), Nov 24, 2014: Cessna T210L. CONTROL UNIT. SEIZED. DURING 50 HOUR INSPECTION, MECHANIC FOUND THE MIXTURE CONTROL OPERATION TO BE VERY STIFF. FOUND THE MIXTURE CONTROL UNIT (N93285) - [SDR CA130509007](https://openairdocs.org/sdr/CA130509007), May 6, 2013: Cessna 172N. CONTROL CABLE. BROKEN. (CAN) UPON ENGINE SHUTDOWN THE PILOT PULLED THE MIXTURE CONTROL CABLE TO IDLE CUT OFF. THE HANDLE OF THE CONTROL CABLE C - [SDR CA130312008](https://openairdocs.org/sdr/CA130312008), Mar 11, 2013: Dhav DHC2MKI. BRACKET. CRACKED. (CAN) DURING INSPECTION, THE MIXTURE CONTROL BRACKET ATTACHED TO THE FIREWALL, PN C2C2927, WAS FOUND TO HAVE A .2500" CR - [SDR CA120715001](https://openairdocs.org/sdr/CA120715001), Jul 13, 2012: Diamon DA20C1. PIN. MISSING. (CAN) DURING INSPECTION, ENGINE CONTROL CHECK, IT WAS NOTICED THAT THE MIXTURE STOP PIN WAS MISSING. THE PIN IS FRICTION - [SDR CA120710005](https://openairdocs.org/sdr/CA120710005), Jul 1, 2012: Cessna 172S. CONTROL CABLE. FAILED. (CAN) DURING TROUBLESHOOTING OF RPM SURGING SNAG THE MIXTURE CONTROL WAS FOUND TO BE STIFF AND VERNIER FOUND TO BE LOOSE - [SDR CA120507013](https://openairdocs.org/sdr/CA120507013), May 6, 2012: Diamon DA40. LINKAGE. DAMAGED. (CAN) PILOT REPORTED THAT THROTTLE CONTROL WOULD NOT PHYSICALLY GO TO FULL THROTTLE. MAINTENANCE PERSONNEL CONFIRMED THA - [SDR CA120110001](https://openairdocs.org/sdr/CA120110001), Jan 9, 2012: Diamon DA20C1. CABLE. BINDING. (CAN) DURING AIRCRAFT START-UP THE PILOT TRIED TO MOVE THE MIXTURE KNOB FROM IDLE CUT-OFF TO FULL RICH AND THE CABLE WOU - [SDR CA111219005](https://openairdocs.org/sdr/CA111219005), Dec 15, 2011: Diamon DA20C1. ARM. DAMAGED. (CAN) PILOT REPORTED EXPERIENCING ENGINE POWER LOSS ON FINAL APPROACH. HE ALSO STATED THAT WHEN HE ATTEMPTED TO APPLY MO - [SDR CA110827001](https://openairdocs.org/sdr/CA110827001), Aug 25, 2011: CONTROL CABLE. WRONG PART. (CAN) ORDERED A NEW LT MIXTURE CONTROL CABLE ASSY FROM MFG. THE CABLE APPEARS TO HAVE BEEN ASSEMBLED INCORRECTLY. IT APP - [SDR 2011FA0000535](https://openairdocs.org/sdr/2011FA0000535), Aug 19, 2011: Grob G120A. CONTROL CABLE. FAILED. PILOT REPORTED DURING FLIGHT HE EXPERIENCED A TOTAL LOSS OF MIXTURE CONTROL. INVESTIGATION REVEALED THE MIXTURE CONTROL (N867AF) - [SDR CA110614006](https://openairdocs.org/sdr/CA110614006), Jun 9, 2011: Diamon DA20C1. CONTROL CABLE. STUCK. ON START-UP THE PILOT WAS NOT ABLE TO MOVE THE MIXTURE CONTROL FROM IDLE CUT OFF, ACFT WAS SNAGED AND INSPECTED AND MIXT - [SDR CA110331020](https://openairdocs.org/sdr/CA110331020), Mar 11, 2011: Robsin R44RAVENII. SERVO. BINDING. (CAN) MIXTURE CABLE BINDING. FUEL SERVO MIXTURE ARM FOUND STIFF, FUEL SERVO REPLACED. - [SDR 2011FA0000234](https://openairdocs.org/sdr/2011FA0000234), Feb 21, 2011: Cessna A185F. CONTROL CABLE. OUT OF POSITION. DURING THE FIRST FLIGHT TEST AFTER ENGINE INSTALLATION, THROTTLE CONTROL CABLE STARTED TO MOVE HARD AND SEEMED TO BE BIN (N724MT) - [SDR CA110208019](https://openairdocs.org/sdr/CA110208019), Feb 4, 2011: Piper PA31350. CONTROL CABLE. FAILED. (CAN) AIRCRAFT RETURNED TO BASE AFTER FLIGHT. PILOT, IN THE PROCESS OF SHUTTING DOWN ENGINES, DISCOVERED THE LEFT ENGINE - [SDR CA101130009](https://openairdocs.org/sdr/CA101130009), Nov 16, 2010: Cessna A188B. SLEEVE. PULLED. OUTER SLEEVE THAT KEEPS THE INNER CABLE STRAIGHT PULLED OUT FROM ITS PIVOT POINT BY WEAR. CABLE WAS EXPOSED (4 INCHES OF - [SDR 2010FA0001103](https://openairdocs.org/sdr/2010FA0001103), Sep 20, 2010: Beech 95B55. CONTROL CABLE. DETACHED. DURING FLIGHT, THE RT ENGINE MIXTURE CONTROL FAILED AND THE ENGINE QUIT. AFTER LANDING, FOUND THE SWAGGED END OF THE MIX (N9420Y) - [SDR 2010FA0000851](https://openairdocs.org/sdr/2010FA0000851), Aug 20, 2010: Grob G120A. CONTROL CABLE. BROKEN. PILOT REPORTED DURING GROUND OPERATION HE EXPERIENCED A TOTAL LOSS OF MIXTURE CONTROL. INVESTIGATION MIXTURE CONTROL CAB (N861AF) - [SDR 2010FA0000937](https://openairdocs.org/sdr/2010FA0000937), Aug 19, 2010: Cessna T210N. STOP PIN. MISSING. PILOT REPORTED ENGINE WOULD NOT SHUTDOWN WITH MIXTURE LEAN, UPON INSP OF CAUSE, FOUND MIXTURE STOP PIN MISSING AND HAD F (N2145U) - [SDR 2010FA0000409](https://openairdocs.org/sdr/2010FA0000409), Apr 3, 2010: Cessna 310G. BARREL. WORN. PILOT STATED THAT WHILE IN FLIGHT AT 5000 FT, HE WAS UNABLE TO CHANGE THE MIXTURE SETTING ON THE LT ENGINE. THIS ENGINE (N8911Z) - [SDR 2010FA0000079](https://openairdocs.org/sdr/2010FA0000079), Jan 28, 2010: Beech F33C. CONTROL ARM. BINDING. AFTER LANDING ACFT, WAS TAXIING BACK TO PARKING AND ENGINE QUIT. TECH TROUBLESHOT SYS AND FOUND FUEL CONTROL UNIT MIXTUR (N851K) - [SDR 2009FA0001023](https://openairdocs.org/sdr/2009FA0001023), Nov 30, 2009: Piper PA44180. CONTROL CABLE. FROZEN. DURING ENGINE SHUTDOWN, PILOT COULD NOT MOVE RT MIXTURE CONTROL. UPON FUTHER INSP, CONTROL WAS FOUND TO BE FROZEN. THIS (N494ND) - [SDR CA091127004](https://openairdocs.org/sdr/CA091127004), Nov 19, 2009: Diamon DA20C1. ROD END. WORN. (CAN) DURING SCHEDULED MAINTENANCE IT WAS DISCOVERED THAT THE BUSHINGS RETAINING THE ROD END SWIVEL BALL WERE WORN AND O - [SDR CA090723006](https://openairdocs.org/sdr/CA090723006), Jul 20, 2009: Beech 200BEECH. CONTROL CABLE. WORN. (CAN) DURING SCHEDULED INSP, IT WAS NOTED THAT SWAGED END OF CONDITION LEVER CONTROL CABLE THAT ATTACHED THE FCU WAS WOR - [SDR CA090401002](https://openairdocs.org/sdr/CA090401002), Mar 24, 2009: Diamon DA20C1. ROD END. WORN. (CAN) DURING INSP THE ROD END WHICH ATTACHES THE MIXTURE CABLE TO THE MECHANICAL FUEL PUMP MIXTURE CONTROL ARM WAS FOUND - [SDR CA090313003](https://openairdocs.org/sdr/CA090313003), Nov 17, 2008: Robsin R22BETAII. CONTROL CABLE. BROKEN. (CAN) MIXTURE CONTROL CABLE INNER WIRE FOUND BROKEN. - [SDR NSV2008F00026](https://openairdocs.org/sdr/NSV2008F00026), Sep 18, 2008: Bombdr DHC8402. CONDITION LEVER. MALFUNCTIONED. DURING INITIAL CLIMB PEC NR 1 AND NR 2 CAUTION LIGHT ILLUMINATED AFTER INADVERTENT MOVEMENT OF CONDITION LEVERS PAST 850 (N187WQ) - [SDR CA071115008](https://openairdocs.org/sdr/CA071115008), Oct 31, 2007: Diamon DA20C1. BEARING. SEIZED. (CAN) PILOT REPORTED MIXTURE STICKING DIFFICULT TO MOVE. INSPECTION REVEALED MIXTURE CONTROL ROD END AT MECHANICAL FUEL - [SDR CA071004006](https://openairdocs.org/sdr/CA071004006), Oct 1, 2007: Cessna 414. CABLE. BROKEN. (CAN) DURING THE ENGINE RUN-UP, THE RT ENGINE DID NOT RESPOND TO MIXTURE CONTROL. THE MIXTURE CONTROL CABLE WAS FOUND BR - [SDR CA070502008](https://openairdocs.org/sdr/CA070502008), Apr 27, 2007: Piper PA28R201T. CONTROL CABLE. DAMAGED. (CAN) MIXTURE CONTROL WAS FOUND TO BE STIFF BY MAINT ON AN ENGINE START FOR TAXI TO HANGER. CABLE WAS REMOVED. THE CABLE - [SDR 2005FA0001228](https://openairdocs.org/sdr/2005FA0001228), Aug 29, 2005: Beech 23. CONTROL CABLE. FRACTURED. THE PILOT LOST ENGINE POWER DURING TAKEOFF. EXAM FOUND MIXTURE CONTROL CABLE FRACTURED AT 90-DEGREE ANGLE NEAR SET SCREW (N2388Q) - [SDR GAJ2005F00001](https://openairdocs.org/sdr/GAJ2005F00001), Aug 15, 2005: Cessna TU206G. CONTROL CABLE. FROZEN. 3/25/04, HOBBS 3218.1, TTAF 9745.1, REMOVED AND REINSTALLED ENGINE, THROTTLE, MISTURE AND PROP CONTROLS. 7/22/04, HOBBS (N7537N) - [SDR CA050711005](https://openairdocs.org/sdr/CA050711005), Jul 6, 2005: Cessna 172M. CONTROL CABLE. BROKEN. WHEN SHUTTING DOWN, THE ENGINE ON THE RAMP AFTER FLIGHT PILOT PULLED THE MIXTURE CONTROL TO LEAN AND THE CABLE BROKE. EN - [SDR CA050624008](https://openairdocs.org/sdr/CA050624008), Jun 23, 2005: Cirrus SR20. CONTROL CABLE. SEIZED. (CAN) MIXTURE CONTROL WAS FOUND STIFF TO OPERATE. INSPECTION FOUND CABLE OUTER SLEEVE IS SEIZED ONTO THE INNER CABLE JUS - [SDR 2005FA0001600](https://openairdocs.org/sdr/2005FA0001600), May 23, 2005: Piper PA23250. CABLE. BROKEN. MIXTURE CABLE BROKE AT CONTROL LEVER END. 7 STRAND INNER CABLE PARTED .7500 INCH FROM PUSH/PULL SLIDER CABLE END. CABLE (N63790) - [SDR AU510001617](https://openairdocs.org/sdr/AU510001617), Apr 6, 2005: Piper PA31350. ROD END. LOOSE. (AUS) LT ENGINE MIXTURE CONTROL RODEND LOOSE. BALL WAS ONLY RETAINED BY SECONDARY RETAINER CLIP. FINGER PRESSURE COULD D - [SDR CA041215002](https://openairdocs.org/sdr/CA041215002), Dec 14, 2004: Cessna 152. CONTROL UNIT. LOOSE. (CAN) PILOT WAS IN CRUISE, HE STARTED TO LEAN THE ENGINEWENT PAST LEAN OF PEAK SO HE PUSHED THE MITURE BACK IN BUT THE E - [SDR CA040304007](https://openairdocs.org/sdr/CA040304007), Mar 3, 2004: Beech 95B55. CONTROL CABLE. BROKEN. (CAN) DURING CRUISE FLIGHT THE PILOT NOTICED THAT THE RT MIXTURE WAS NOT RESPONDING TO CONTROL MOVEMENT. THE AIRCRAFT RE - [SDR DHL2004873002](https://openairdocs.org/sdr/DHL2004873002), Jan 28, 2004: Doug DC873F. BOLT. LOOSE. NR 2 START LEVER WILL NOT SHUT OFF, STUCK IN ON POSITION. REINSTALLED BOLT AND NUT ASSEMBLY ON NR2 ENGINE POWER CONTROL (N873SJ) - [SDR 2004FA0000065](https://openairdocs.org/sdr/2004FA0000065), Dec 4, 2003: Piper PA24250. CONTROL CABLE. MISROUTED. MIXTURE CONTROL CABLE SECURED AND/OR ROUTED INCORRECTLY WHEN MIXTURE CONTROL CABLE WAS REPLACED AND/OR LUBED. WHEN THE C (N7369P) - [SDR 2003FA0001108](https://openairdocs.org/sdr/2003FA0001108), Oct 23, 2003: Diamon DA20C1. CONTROL CABLE. BROKEN. MIXTURE CONTROL CABLE BROKEN AT THE FIREWALL. THIS IS THE FIFTH ONE TO FAIL ALL AT THIS LOCATION. INSPECTION OF THE 28 A (N919AF) - [SDR AUS20030635](https://openairdocs.org/sdr/AUS20030635), Jun 18, 2003: Bnorm BN2B20. BALL JOINT. BROKEN. (AUS) RT ENGINE MIXTURE CONTROL BALL JOINT FAILED. All 144: https://openairdocs.org/jasc/7602/reports.md ## Other codes in chapter 76 - [JASC 7600](https://openairdocs.org/jasc/7600): Engine Controls (513 reports) - [JASC 7601](https://openairdocs.org/jasc/7601): Engine Synchronizing (30 reports) - [JASC 7603](https://openairdocs.org/jasc/7603): Power Lever (1,582 reports) - [JASC 7620](https://openairdocs.org/jasc/7620): Engine Emergency Shutdown System (40 reports) - [JASC 7697](https://openairdocs.org/jasc/7697): Engine Control System Wiring (66 reports) --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. 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