# JASC 6122: Propeller Governor

- Type: JASC system/component code (FAA)
- ATA chapter: 61 Propeller/Propulsors
- Title in the code table: PROPELLER GOVERNOR
- Service difficulty reports: 708
- FAA code table: https://www.faa.gov/sites/faa.gov/files/JASC_Code.pdf#page=56
- Page: https://openairdocs.org/jasc/6122

## What it covers

The unit which controls the propeller blade angle, but is limited to parts in and on the governor. Does not include airframe furnished control linkage from the cockpit which is filed in JASC code 6120. The component make and model should be included in the report as well as the number of the defective part. Typical parts are shaft, flyweight, governor, spring, arm, seal, beta valve, pilot valve, head, etc.

## Service difficulty reports (708, newest 50)

- [SDR 2026FA0000649](https://openairdocs.org/sdr/2026FA0000649), Aug 17, 2026: GOVERNOR. FAILED. MCCAULEY PROP GOVERNOR SENT IN FOR DIAGNOSING AN INFLIGHT PROBLEM. AS RECEIVED THE GOVERNOR WOULDN'T TURN. REMOVED THE B
- [SDR 2026FA0000552](https://openairdocs.org/sdr/2026FA0000552), Jun 21, 2026: Bag JETSTM3201. TUBE. CRACKED. AIRCRAFT EXPERIENCED A LOW OIL PRESSURE INDICATION AND ILLUMINATION OF THE OIL WARNING LIGHT ON THE RIGHT-HAND (RT) ENGI
- [SDR N3XR202603200001](https://openairdocs.org/sdr/N3XR202603200001), Mar 12, 2026: Diamon DA42NG. GOVERNOR. OVERSPEED. DURING THE CLIMB, THE LEFT ENGINE EXPERIENCED AN RPM OVERSPEED. THE GOVERNOR WAS REPLACED. (N302ER)
- [SDR N3XR202603020002](https://openairdocs.org/sdr/N3XR202603020002), Feb 27, 2026: Diamon DA42. GOVERNOR. INOPERATIVE. LEFT ENGINE OVERSPEED. RPM'S STARTED TO INCREASE WITH POWER BEING BROUGHT BACK TO ZERO %. (N319ER)
- [SDR N3XR2026030201](https://openairdocs.org/sdr/N3XR2026030201), Feb 25, 2026: Diamon DA42NG. GOVERNOR. INOPERATIVE. LT ENG CONSTANT OVERSPEED EVEN WITH THROTTLE PULLED BACK, (N309ER)
- [SDR UOIA2025042500006](https://openairdocs.org/sdr/UOIA2025042500006), Apr 25, 2025: Bnorm BN2A8. SHAFT. BROKEN. AT LANDING IN VIEQUES AIRPORT RIGHT ENGINE PRESENTED EXCESSIVE VIBRATION SO PILOT PERFORMED PREVENTIVE SHUTDOWN. ENGINE  (N903GD)
- [SDR 2025F00108](https://openairdocs.org/sdr/2025F00108), Apr 25, 2025: Bnorm BN2A8. SHAFT. BROKEN. AT LANDING IN VIEQUES AIRPORT RIGHT ENGINE PRESENTED EXESIVE VIBRATION, PILOT PERFORMED PREVENTIVE SHUTDOWN. ENGINE WAS  (N903GD)
- [SDR CVGA20250218003](https://openairdocs.org/sdr/CVGA20250218003), Feb 12, 2025: Beech B300. GOVERNOR. FAULTY. LEFT PROP STUCK AT 1570 RPM IN FLIGHT - EMERGENCY DECLARED - TROUBLESHOOTING ISOLATED TO PROPELLER PRIMARY GOVERNOR. REM (N891UP)
- [SDR 2024FA0000855](https://openairdocs.org/sdr/2024FA0000855), Nov 20, 2024: Cirrus SR22. GOVERNOR. ABNORMAL. PILOT REPORTED A VIBRATION OR SURGE FROM PROPELLER WHEN DESCENDING OR LANDING. GOVERNOR SHOP REPORTED THE SPOOL VALVE IS (N345CE)
- [SDR 2023FA0000362](https://openairdocs.org/sdr/2023FA0000362), Jun 13, 2023: Airtrc AT802A. GASKET. UNKNOWN. AIRCRAFT HAD POWER SECTION AND GOVERNORS OVERHAULED AFTER PROP STRIKE INCIDENT. FIRST TEST RUN ON AIRCRAFT AFTER OVERSPE (N969WP)
- [SDR JIKA2023060802](https://openairdocs.org/sdr/JIKA2023060802), Jun 8, 2023: Swrngn SA227AC. GOVERNOR. FAILED. AMF1351 - THE RIGHT ENGINE WAS NOT PRODUCING 100% POWER AND IT KEPT GETTING LOWER AND ENGINE TEMP CONTINUED TO RISE. ONC (N709TR)
- [SDR 2022FA0000622](https://openairdocs.org/sdr/2022FA0000622), Oct 9, 2022: Piper PA28236. GOVERNOR. DAMAGED. DURING APPROACH TO LANDING, ENGINE DECREASED RPM UNCOMMANDED, PILOT NOTICED OIL COMING OUT OF THE COWLING ONTO THE WINDS (N4305N)
- [SDR W59R15956](https://openairdocs.org/sdr/W59R15956), Sep 29, 2022: Cessna 310R. BEARING. FAILED. LEFT ENGINE ON AIRCRAFT WOULD NOT MAKE RPM OR CYCLE PROPELLER. BA59 BEARING FOUND IN LEFT ENGINE GOVERNOR, THIS UNIT THE (N310LA)
- [SDR W59R15971](https://openairdocs.org/sdr/W59R15971), Sep 29, 2022: Cessna 310R. BEARING. FAILED. ENGINE WOULD NOT MAKE RED LINE RPM OR CYCLE. GOVERNOR REMOVED, DRIVE GEAR WOULD NOT TURN. GOVERNOR DISASSEMBLED AND FOUN (N310LA)
- [SDR 2022FA0000403](https://openairdocs.org/sdr/2022FA0000403), Jul 24, 2022: Piper PA23250. GOVERNOR. INOPERATIVE. LH PROPELLER GOVERNOR CAN NOT CONTROL PROPELLER RPM. SUSPECT PROP. GOVERNOR IS AT FAULT. REMOVED PROP. GOVERNOR AND SENT (N2345R)
- [SDR 2022FA0000312](https://openairdocs.org/sdr/2022FA0000312), Jun 19, 2022: Piper PA24250. GOVERNOR. INOPERATIVE. PILOTS INVOLVED REPORTED THE FOLLOWING: DURING CRUISE FLIGHT BY KEET THE PILOTS NOTED A SUDDEN DECREASE IN POWER FOLLOWE (N8298P)
- [SDR N3XR20220524001](https://openairdocs.org/sdr/N3XR20220524001), May 24, 2022: Diamon DA42. GOVERNOR. STICKING. DURING ECU SELF-TEST, AN ERROR MESSAGE APPEARED SHOWING TIME OUT. INSPECTION REVEALED A MALFUNCTIONING GOVERNOR. IT WAS  (N311ER)
- [SDR N3XR202205240002](https://openairdocs.org/sdr/N3XR202205240002), May 2, 2022: Diamon DA42. GOVERNOR. INOPERATIVE. SELF-TEST FAILURE DURING ECU SELF-TEST. REPLACED GOVERNOR. (N309ER)
- [SDR N3XR 10_7_21](https://openairdocs.org/sdr/N3XR%2010_7_21), Oct 7, 2021: Diamon DA42NG. GOVERNOR. INOPERATIVE. LT. GOVERNOR FAILED TO MOVE IN FLIGHT. USING THE MT GOVERNOR TEST TOOL, THE GOVERNOR WAS OPERATED, THE CONNECTION CLEANE (N308ER)
- [SDR N3XR 10_7_21_02](https://openairdocs.org/sdr/N3XR%2010_7_21_02), Oct 6, 2021: Diamon DA42NG. GOVERNOR. INOPERATIVE. ON TAKE-OFF RPM REMAINED AT 2400 AND ONLY CAME DOWN WHEN POWER WAS SET TO 30%. THE GOVERNOR WAS CHANGED...THIS OPERATOR  (N309ER)
- [SDR N3XR 10_7_21_03](https://openairdocs.org/sdr/N3XR%2010_7_21_03), Sep 21, 2021: Diamon DA42NG. GOVERNOR. INOPERATIVE. DURING PRE-TAKEOFF RUN-UP THE RIGHT ENGINE GOVERNOR FAILED TO PRODUCE THE CORRECT RPM. THE GOVERNOR WAS REPLACED (N307ER)
- [SDR DATA07092021001](https://openairdocs.org/sdr/DATA07092021001), Jul 7, 2021: Stbros SD360300. GOVERNOR. INOPERATIVE. AT 10,000 MSL ON CLIMB THE NUMBER 2 PROPELLER RPM SLOWLY STARTED TO DECREASE. AN ATTEMPT TO FORWARD THE PROPELLER LEVER  (N764JR)
- [SDR DATA2021043001](https://openairdocs.org/sdr/DATA2021043001), Apr 30, 2021: Stbros SD360200. GOVERNOR. MALFUNCTIONED. DURING A TRAINING FLIGHT, WHEN SIMULATING THE V1 CUT THE LEFT PROPELLER TRIED TO GO INTO AUTOFEATHER AND THE ENGINE SURG (N3732X)
- [SDR UATA202104133317](https://openairdocs.org/sdr/UATA202104133317), Apr 1, 2021: Casa C212CC. GOVERNOR. INOPERATIVE. ON T/O ROLL OUT OF OOK AT V1 SPEED, #1 ENGINE BETA LIGHT CAME ON. PILOTS ELECTED TO TAKE OFF. TORQUE DROPPED 40%, AND PR (N1331C)
- [SDR N3XR20210208001](https://openairdocs.org/sdr/N3XR20210208001), Feb 8, 2021: Diamon DA42. FLYWHEEL. WORN. DURING A ROUTINE ANNUAL INSPECTION, THE MASS FLYWHEEL (TVD) UNIT WAS INSPECTED AS REQUIRED AT 600 TIS. THE INSPECTION RE
- [SDR 2021FA0000023](https://openairdocs.org/sdr/2021FA0000023), Jan 26, 2021: Cessna T206H. GOVERNOR. MISREPAIRED. ENGINE RPM FOLLOWS MANIFOLD PRESSURE IN ALL FLIGHT ENVELOPES. REMOVED PROPELLER GOVERNOR AFTER 218.4HRS TIS AFTER OVERHA (N3543B)
- [SDR JIKA2020060252801](https://openairdocs.org/sdr/JIKA2020060252801), May 28, 2020: Swrngn SA227AT. GOVERNOR. LEAKING. ON SHORT APPROACH TO MÉRIDA, APPROXIMATELY 300 AGL AND WITH APPROACH POWER SELECTED, THE RT ENGINE BEGAN SIGNIFICANT POW (N248DH)
- [SDR N3XR202001280001](https://openairdocs.org/sdr/N3XR202001280001), Jan 28, 2020: Diamon DA42NG. GOVERNOR. BINDING. IP STATED THAT THEY ATTEMPTED TO ADJUST THE THROTTLE MULTIPLE TIMES FOLLOWING TAKEOFF WITH LITTLE TO NO RESPONSE IN PROP (N311ER)
- [SDR N3XR20201211001](https://openairdocs.org/sdr/N3XR20201211001), Dec 9, 2019: Diamon DA42NG. GOVERNOR. JAMMED. GROUND RAN THE AIRCRAFT AND NOTED THE LEFT ENGINE PROP GOVERNOR WAS FAILING TO CYCLE. THE ENGINE DATA WAS READ, AND THE  (N307ER)
- [SDR N3XR201912110001](https://openairdocs.org/sdr/N3XR201912110001), Nov 13, 2019: Diamon DA42NG. GOVERNOR. JAMMED. READ AIRCRAFT DATA CARD. VERIFIED ISSUE WITH THE LEFT ENGINE RPM EXCEEDING 2300. RAN THE LEFT ENGINE AND ATTEMPTED ECU S (N307ER)
- [SDR 2019FA0000264](https://openairdocs.org/sdr/2019FA0000264), Jul 27, 2019: Cessna 172RG. GOVERNOR. FLUCTUATES. PROPELLER GOVERNOR FAILURE/MALFUNCTION. GOVERNOR FLUCTUATED IN FLIGHT. (N9924B)
- [SDR CA190614020](https://openairdocs.org/sdr/CA190614020), Jun 12, 2019: Gulstm 690A. ORIFICE. FOD. (CAN) ON THE 12TH OF JUNE PILOT REPORTED THAT HE COULD NOT GET THE #1 PROP OFF THE LOCKS. INSPECTED AND CLEANED THE LOCK
- [SDR 29GA2019053100002](https://openairdocs.org/sdr/29GA2019053100002), May 31, 2019: Saab 340B. GOVERNOR. FAILED. FLIGHT# 0054, R ENGINE PROP RPM UNDERSPEED (1150 IN THE AIR). R & R RH PROP OVERSPEED GOV IAW SAAB 340 AMM 61-20-15-02-1 (N348AG)
- [SDR CA190529019](https://openairdocs.org/sdr/CA190529019), May 29, 2019: GOVERNOR. MALFUNCTIONED. (CAN) LH ENGINE HAD ECU A FAIL INDICATION ON TAKEOFF, APPROX. 2 MINUTES LATER, ECU B FAIL INDICATION ILLUMINATED. SUBSEQ
- [SDR CA190516017](https://openairdocs.org/sdr/CA190516017), May 15, 2019: Beech 1900C. SOLENOID. STUCK. (CAN) THE TEST SOLENOID ON THE OVER SPEED GOVERNOR WAS STUCK IN THE TEST POSITION LIMITING THE PROP RPM TO 1550 RPM. THE
- [SDR HYIA20190515003](https://openairdocs.org/sdr/HYIA20190515003), May 8, 2019: Cessna 402C. GOVERNOR. FAILED. PILOT REPORTED RIGHT PROP WENT ALL THE WAY TO THE DETENTE AT CLIMB POWER BUT NEVER CAME BELOW 2700 RPM. MAINTENANCE INSP (N2651S)
- [SDR CA190501014](https://openairdocs.org/sdr/CA190501014), Apr 30, 2019: Diamon DA40NG. SHAFT. SHEARED. (CAN) GOVERNOR HAS INTERNAL LATCH FAILURE DURING INITIAL GROUND RUNS. FOUND GOVERNOR SHAFT SHEARED OFF WHEN GOVERNOR REM
- [SDR QXEA2019042200181](https://openairdocs.org/sdr/QXEA2019042200181), Apr 22, 2019: Bombdr DHC8402. GOVERNOR. INOPERATIVE. #1 ENG TORQUE OBSERVED @ 93% ON TAKE OFF FOLLOWED BY NR 1 PROP RPM OF 990 TO ACCELERATION HEIGHT TO CLIMB POWER. 900 RPM (N453QX)
- [SDR CA190415001](https://openairdocs.org/sdr/CA190415001), Apr 13, 2019: Beech 1900D. GOVERNOR. WEAK. (CAN) LEFT ENGINE AUTO FEATHER ENGAGED ON APPROACH PILOT REPORTED PROP FEATHERED FOR ABOUT 3 SEC WHEN POWER WAS REDUCED 
- [SDR JIKA20190404101](https://openairdocs.org/sdr/JIKA20190404101), Apr 1, 2019: Swrngn SA227AT. GOVERNOR. OVERSPEED. THE PILOT REPORTED THAT IN CRUISE FLIGHT, THE LH PROP RPM ROSE TO 101%, THEN UP TO 102% AND EVENTUALLY 103% AS THE PILOT (N548UP)
- [SDR CA190322006](https://openairdocs.org/sdr/CA190322006), Mar 20, 2019: Bombdr DHC8400. GOVERNOR. MALFUNCTIONED. (CAN) AIRCRAFT HAD A COMMANDED IN-FLIGHT ENGINE SHUT DOWN. THE CREW REPORTED IN THE AML: `SHORTLY AFTER TAKEOFF THE NUMB
- [SDR 2019FA0000168](https://openairdocs.org/sdr/2019FA0000168), Mar 15, 2019: Cessna TU206G. NUT. DEFECTIVE. ATTACHMENT NUTS SUPPLIED WITH ATTACHMENT KIT (P/N KPL2001) FAILED BEFORE REACHING RECOMMENDED TORQUE (180-220 IN LBS). T (N7PCMO)
- [SDR Q9UA2019FA0000058](https://openairdocs.org/sdr/Q9UA2019FA0000058), Mar 8, 2019: Cvac 340CVAC. GOVERNOR. INTERMITTENT. FLIGHT CREW INABILITY TO ADJUST RPM INFLIGHT VIA PROPELLER SPEED CONTROL. PROPELLER SPEED CONTROL COULD BE ADJUSTED ON T (N145GT)
- [SDR DATA2018120300001](https://openairdocs.org/sdr/DATA2018120300001), Nov 29, 2018: Stbros SD360. GOVERNOR. FAILED. CREW EXPERIENCED ENGINE FAILURE SHORTLY AFTER DEPARTING SDQ. THE FAILURE OCCURRED APPROXIMATELY 40 MILES WEST OF SDQ. AF (N385MQ)
- [SDR QXEA2018101500364](https://openairdocs.org/sdr/QXEA2018101500364), Oct 12, 2018: Bombdr DHC8402. GOVERNOR. MALFUNCTIONED. ON INITIAL CLIMB, NR 1 RPM SHOWED 1010 WITH CONDITION LEVERS MAX. CONDITION LEVERS BROUGHT BACK TO 900. NR 1 PROP RPM DR (N450QX)
- [SDR 29GA2018071800001](https://openairdocs.org/sdr/29GA2018071800001), Jul 18, 2018: Saab 340B. PRESSURE SWITCH. FAILED. FLT 0135 RSW/EYW REPORT. DURING APPROACH BASE TO FINAL, LT ENGINE TORQUE WAS AROUND 20-25% AND SUDDENLY INCREASED TO 60- (N343AG)
- [SDR QXEA2018060100207](https://openairdocs.org/sdr/QXEA2018060100207), May 30, 2018: Bombdr DHC8402. GOVERNOR. MALFUNCTIONED. AFTER ENGINE START, BROUGHT PROPS LEVERS TO 1020. NR 1 ENGINE TOOK 1 MINUTE LONGER TO UNFEATHER THAN THE NR 2. REPLACED  (N447QX)
- [SDR QML201805108057](https://openairdocs.org/sdr/QML201805108057), May 10, 2018: Pilats PC1245. GOVERNOR. INTERMITTENT. ON DEPARTURE PROPELLER RPM WAS VERY LOW. 1635 VS 1700 GOOD TORQUE, PLANE ACCELERATED RPM STARTED TO INCREASE AND YELLOW  (N299AM)
- [SDR TIMA20180214003](https://openairdocs.org/sdr/TIMA20180214003), Feb 7, 2018: Beech 1900C. GOVERNOR. OPEN. PROPELLER DID NOT COME OUT OF FEATHER AFTER A PROPELLER CYCLE CHECK DURING RUN-UP. REPLACING THE OVERSPEED GOVERNOR ELIM (N192GA)
- [SDR T8VA20171121001](https://openairdocs.org/sdr/T8VA20171121001), Oct 19, 2017: Piper PA31350. DRIVE GEAR. SHEARED. DURING SETUP FOR APPROACH TO LANDING STALL, RIGHT ENGINE FAILED AND WAS SECURED. EMERGENCY WAS DECLARED AND AIRCRAFT RET (N713WT)

All 708: https://openairdocs.org/jasc/6122/reports.md

## Other codes in chapter 61

- [JASC 6100](https://openairdocs.org/jasc/6100): Propeller System (193 reports)
- [JASC 6110](https://openairdocs.org/jasc/6110): Propeller Assembly (1,590 reports)
- [JASC 6111](https://openairdocs.org/jasc/6111): Propeller Blade Section (1,724 reports)
- [JASC 6112](https://openairdocs.org/jasc/6112): Propeller Deice Boot Section (119 reports)
- [JASC 6113](https://openairdocs.org/jasc/6113): Propeller Spinner Section (364 reports)
- [JASC 6114](https://openairdocs.org/jasc/6114): Propeller Hub Section (1,249 reports)
- [JASC 6120](https://openairdocs.org/jasc/6120): Propeller Controlling System (1,421 reports)
- [JASC 6121](https://openairdocs.org/jasc/6121): Propeller Synchronizer Section (37 reports)
- [JASC 6123](https://openairdocs.org/jasc/6123): Propeller Feathering/Reversing (919 reports)
- [JASC 6130](https://openairdocs.org/jasc/6130): Propeller Braking (22 reports)
- [JASC 6140](https://openairdocs.org/jasc/6140): Propeller Indication System (292 reports)
- [JASC 6197](https://openairdocs.org/jasc/6197): Propeller/Propulsor System Wiring (99 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.