# JASC 7261: Turbine Engine Oil System

- Type: JASC system/component code (FAA)
- ATA chapter: 72 Turbine/turboprop Engine
- Title in the code table: TURBINE ENGINE OIL SYSTEM
- Service difficulty reports: 5,122
- FAA code table: https://www.faa.gov/sites/faa.gov/files/JASC_Code.pdf#page=61
- Page: https://openairdocs.org/jasc/7261

## What it covers

The system components and parts which provide lubricating oil pressure, circulation and scavenging throughout the engine. Does not include externally mounted storage tanks filed in JASC code 7910, coolers in JASC code 7921, or connecting lines in JASC code 7920. Typical parts are relief valve, fitting, seal, pump, screen, filter, seal, check valve, element, etc.

## Service difficulty reports (5,122, newest 50)

- [SDR DALA2026101805705](https://openairdocs.org/sdr/DALA2026101805705), Oct 18, 2026: Airbus A321271NX. PACKING. LEAKING. AT 15,000 FT ON DECENT INTO SLC FA OBSERVED MUSTY DIRTY SOCK AND PAINT SMELL IN AFT OF AIRCRAFT. ON SHORT FINAL AND TAXI (N548DN)
- [SDR HEEA20261526001](https://openairdocs.org/sdr/HEEA20261526001), Oct 13, 2026: Skrsky S92A. SENSOR. UNSERVICEABLE. #1 ENG OIL BYPASS ILLUMINATED APPROX. 75 MINUTES INTO FLIGHT. (N935PH)
- [SDR UIEA2026101200981](https://openairdocs.org/sdr/UIEA2026101200981), Oct 12, 2026: Boeing 74745EF. PACKING. MISSING. 1:30HR INTO FLIGHT AT 36000 ENG 4 OIL QTY INDICATED 10 MAGENTA, DECREASED APPROX EVERY 10-20 MINS. 0 QTS INDICATED AT TO (N485MC)
- [SDR DALA2026101405639](https://openairdocs.org/sdr/DALA2026101405639), Oct 8, 2026: Boeing 767332. B-NUT. LOOSE. DIVERTED TO MCI DUE TO RIGHT ENGINE OIL QTY LOSS, PRESSURE HOLDING STEADY. FOUND LOOSE B-NUT AT NR 6 BEARING OIL LINE LE (N169DZ)
- [SDR IXXA20261008092](https://openairdocs.org/sdr/IXXA20261008092), Oct 8, 2026: Boeing 767323. SWITCH. INOPERATIVE. AT APPROX 100-400 FT, RT OIL FILTER EICAS MSG APPEARED. QRH PROCEDURES WERE FOLLOWED. BEFORE RT ENG SHUTDOWN, ALL ENG PA (N379AZ)
- [SDR DALA2026100905573](https://openairdocs.org/sdr/DALA2026100905573), Oct 7, 2026: Airbus A330941. OIL SYSTEM. LEAKING. AIRCRAFT RETURNED TO ACC DUE TO LEFT ENGINE OIL LOSS. REPLACED NUMBER ONE ENGINE. OK FOR SERVICE. (9531653) AIRCRAFT WAS (N430DX)
- [SDR 2026FA0000821](https://openairdocs.org/sdr/2026FA0000821), Oct 6, 2026: Agusta AW109SP. REGULATOR VALVE. FAULTED. HELICOPTER N57HR EXPERIENCED NR 1 OIL HOT LIGHT IN FLIGHT. PER RFM IT SAYS TO ACHIEVE SAFE OEI FLIGHT AND SHUT DOWN ENGI (N57HR)
- [SDR YENA2026100700928](https://openairdocs.org/sdr/YENA2026100700928), Oct 5, 2026: Airbus A321271NX. SEAL. DAMAGED. FLT # 842, DUB-JFK. (ETOPS) "WHILE PERFORMING OIL CONSUMPTION MONITORING TASK PW1100G-A-78-00-00-01A-310A-A. NO OIL DRIP (N2205J)
- [SDR DALA2026100505480](https://openairdocs.org/sdr/DALA2026100505480), Oct 4, 2026: Airbus A321271NX. FAN. CONTAMINATED. FWD FA'S REPORTED DIRTY SOCK SMELL FROM TOD UNTIL LANDING. CORRECTIVE ACTION: ENGINES 1 AND 2 FOUND MINOR ACCUMULATION O (N502DX)
- [SDR DALA2026100205468](https://openairdocs.org/sdr/DALA2026100205468), Sep 27, 2026: Airbus A321271NX. SEAL. LEAKING. FUME- ATB DUE TO FUMES IN THE COCKPIT. REPLACED LEFT ENGINE FRONT FACE SPINNER SEAL, AND PERFORMED P TRAK RUNS. OK FOR S (N528DE)
- [SDR CALA2026092819854](https://openairdocs.org/sdr/CALA2026092819854), Sep 24, 2026: Airbus A319131. OIL SYSTEM. LOW. ENG 1 LOW OIL, AFTER ROTATIONIND 4.5 QT AFTER LEVEL OFF 6-8 QT ENGINE 1 FAN COWLS AND THRUST REVERSERS OPENED TO PERFORM (N814UA)
- [SDR DALA2026092805377](https://openairdocs.org/sdr/DALA2026092805377), Sep 23, 2026: Boeing 757231. OIL SYSTEM. LEAKING. ATB- DUE ODOR IN THE FLIGHT DECK DURING CLIMB. REPLACED LEFT ENGINE. REMOVED OIL CONTAMINATION FROM PACK AND PNEUM SYSTE (N711ZX)
- [SDR DALA2026092305318](https://openairdocs.org/sdr/DALA2026092305318), Sep 22, 2026: Airbus BD5001A11. WARNING MESSAGE. ILLUMINATED. DECLARED AN EMERGENCY FOR RIGHT ENGINE LOW OIL QUANTITY ADVISORY MESSAGE. NR 2 ENGINE REPLACED. (LP 8186488, 1823569, 81 (N308DU)
- [SDR DALA2026092205291](https://openairdocs.org/sdr/DALA2026092205291), Sep 21, 2026: Airbus A321271NX. OIL SYSTEM. LEAKING. APPROXIMATELY 5-10 MIN PRIOR TO TOUCHDOWN FA REPORTED FA'S AT THE BACK OF THE A/C SMELLED "DIRTY SOCK" ODOR. FA'S UP FRO (N503DZ)
- [SDR DALA2026091905235](https://openairdocs.org/sdr/DALA2026091905235), Sep 18, 2026: Airbus A321271NX. SEAL. LEAKING. AIRCRAFT 5043, DURING DESCENT AT 19,000 FT. FA'S REPORTED MUSTY ODOR ORIGINATING AT THE AFT GALLEY AND BEING AS STRONG U (N543DE)
- [SDR UIEA2026091800883](https://openairdocs.org/sdr/UIEA2026091800883), Sep 17, 2026: Boeing 747409F. OIL FILTER. FALSE INDICATION. EICAS MESSAGE ENG 3 OIL FILTER DISPLAYED RAN QRH AND COMPLETED QRH SHUTDOWN ENG 3. PERFORMED FIM TASK 71-00 & TASK A07 P (N439GT)
- [SDR SWIA2026091577210](https://openairdocs.org/sdr/SWIA2026091577210), Sep 15, 2026: Emb ERJ170200LL. B-NUT. LEAKING. ENGINE 1 LOW OIL PRESSURE IN DESCENT, SHUTDOWN ENG 1 IAW QRH UPON LANDING ENG EXCEEDANCE OIL QTY DROPPED IN FLIGHT. (FLT (N270SY)
- [SDR DALA2026091605171](https://openairdocs.org/sdr/DALA2026091605171), Sep 11, 2026: Boeing 757232. PUMP. FAULTED. DECLARED AN EMERGENCY AND DIVERTED TO LAS DUE TO LEFT ENGINE OIL TEMP IN THE AMBER BAND DURING CLIMB. REPLACED LEFT OIL  (N654DL)
- [SDR TAMF20260912062](https://openairdocs.org/sdr/TAMF20260912062), Sep 11, 2026: Airbus A330243F. OIL TUBE. CHAFED. DURING CRUISE ON THE MIA - CWB ROUTE, THE AIRCRAFT EXPERIENCED EXCESSIVE OIL CONSUMPTION ON ENGINE 2. DUE TO THE ABNORMA (N330QT)
- [SDR DALA2026090805023](https://openairdocs.org/sdr/DALA2026090805023), Sep 7, 2026: Airbus A321271NX. OIL SYSTEM. OVERSERVICED. FLIGHT ATTENDANT REPORT DIRTY SOCKS SMELL BY OVERWING EXITS FOR 5-10 MINUTES DISSIPATE WITHOUT ACTION, WAS NOT NOTICED I (N542DE)
- [SDR DALA2026090405002](https://openairdocs.org/sdr/DALA2026090405002), Sep 3, 2026: Airbus A321271NX. SPINNER. LEAKING. ATB, DUE TO F/AS REPORTING A DIRTY SOCK SMELL IN THE CABIN. PERFORMED ISOLATION RUNS WITH P TRAK AND NOTED RIGHT ENGINE  (N521DT)
- [SDR AALA202609044092](https://openairdocs.org/sdr/AALA202609044092), Sep 2, 2026: Boeing 737823. PACKING. WORN. AIRCRAFT WAS GROUNDED: WHILE PERFORMING TROUBLESHOOTING WORK CARD 08L00021001(SMOKE ODOR FUMES INITIAL) FOUND #2 ENGINE  (N913NN)
- [SDR CALA2026090419229](https://openairdocs.org/sdr/CALA2026090419229), Sep 2, 2026: Airbus A321271NX. O-RING. LEAKING. MUSTY SOCK ODOR ON FLIGHT DECK AND FWD ECONOMY CABIN MOST PRONOUNCED DURING DECENT PIREP DIRTY SOCK ODOR STRONG THROUGHO (N54538)
- [SDR DALA2026090304988](https://openairdocs.org/sdr/DALA2026090304988), Sep 2, 2026: Airbus A321271NX. O-RING. LEAKING. FUMES REPORTED, DIRTY SOCK ODOR AT TOP OF DESCENT THROUGH LANDING. DETECTED BY FLIGHT ATTENDANTS. FOUND FAN SHAFT COVER  (N543DE)
- [SDR DALA2026090304985](https://openairdocs.org/sdr/DALA2026090304985), Sep 2, 2026: Airbus A321271NX. SEAL. LEAKING. AFT FA CALLED ON SHORT FINAL REPORTING AN ODOR OF WHAT SMELLED LIKE ELMERS GLUE & RUBBER, FWD FA'S STATED THEY COULD SME (N501DA)
- [SDR DALA2026083104907](https://openairdocs.org/sdr/DALA2026083104907), Aug 28, 2026: Airbus A330323. LINE. LEAKING. ATB - PERFORMED AIR TURN BACK TO BOS FOR RIGHT ENGINE OIL QUANTITY LOSS. REPLACED UPPER AND LOWER #4 SCAVENGE LINES AND  (N815NW)
- [SDR AALA202609012496](https://openairdocs.org/sdr/AALA202609012496), Aug 27, 2026: Airbus A319115. OIL SYSTEM. FLUID LOSS. AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED INTO SAL DUE TO THE FLIGHT CREW REPORTING THAT ENGINE 2 OIL QUANTITY SH (N9004F)
- [SDR SWAA2026082855133](https://openairdocs.org/sdr/SWAA2026082855133), Aug 26, 2026: Boeing 7378. OIL SYSTEM. BYPASSING. TRANSFERRED FROM [TTG8Q01DX41Y] #2 ENG OIL BYPASS LIGHT ON DID NOT EXTINGUISH WHEN THRUST LEVER IN IDLE. THEN ENG FAIL L (N8714Q)
- [SDR AALA202608287167](https://openairdocs.org/sdr/AALA202608287167), Aug 26, 2026: Boeing 7879. OIL SYSTEM. LEAKING. AIRCRAFT WAS GROUNDED: ENGINE NR 2 DID REACH ZERO QTY. ON FINAL OIL PRESSURE NORMAL. DECESION MADE TO DIVERT TO MIA, EME (N823AN)
- [SDR ENHA202608040197](https://openairdocs.org/sdr/ENHA202608040197), Aug 25, 2026: Cessna 208B. B-NUT. LOOSE. SMOKE IN CABIN. MECHANICS FOUND LOOSE B-NUT AT LINE FROM THE AIR/ OIL SEPERATOR TO WET TORQUE INDICATING VENT (FWD FITTI (N502GV)
- [SDR DALA2026082504812](https://openairdocs.org/sdr/DALA2026082504812), Aug 24, 2026: Airbus A321271NX. O-RING. LEAKING. DESCENDING THROUGH 6K AFT FA CALLED WITH ODOR DESRIBED AS BURNT POPCORN. AT 3K PURSER CALLED AS SHE COULD NOW SMELL ODOR (N543DE)
- [SDR DALA2026082604837](https://openairdocs.org/sdr/DALA2026082604837), Aug 23, 2026: Boeing 767432ER. OIL SYSTEM. LEAKING. ATB- RIGHT ENGINE ROLLED BACK ON TAKEOFF ABOVE V1. AFTER AIRBORNE, ENGINE POWER RETURNED TO NORMAL. ON CLIMB, HAD A FUME (N845MH)
- [SDR DALA2026082404785](https://openairdocs.org/sdr/DALA2026082404785), Aug 23, 2026: Airbus A321271NX. OIL SYSTEM. LEAKING. MUSTY VINEGAR SMELL IN CABIN DURING DESCENT AT 10,500FT. PASSENGERS FROM COMFORT PLUS TO THE LAST ROW IN MAIN CABIN NOTI (N536DN)
- [SDR 2026FA0000657](https://openairdocs.org/sdr/2026FA0000657), Aug 20, 2026: Boeing 7673CB. OIL SYSTEM. FAULTED. HAD AN AIR RETURN FLIGHT, IN GENEVA, WITH CUSTOMER UNITED. THE AIRCRAFT FLIGHT NUMBER UA957. AIRCRAFT EXPERIENCED AN ABN (N686UA)
- [SDR DALA2026081704700](https://openairdocs.org/sdr/DALA2026081704700), Aug 16, 2026: Airbus A321271NX. OIL SYSTEM. LEAKING. ON DESCENT BETWEEN FL190 AND 17000 FAINT DIRTY SOCK ODOR, FOR ABOUT 30 SECONDS. DUE TO OIL FINDINGS IN/ON ENG NR 1 INLET (N579DT)
- [SDR DALA2026081404650](https://openairdocs.org/sdr/DALA2026081404650), Aug 12, 2026: Airbus BD5001A11. SEAL. LEAKING. IN FLIGHT LIGHT ODOR DETECTED AROUND ROWS 17,18,19,20. FOUND OIL IN NR 2 ENGINE SPINNER, REPLACED FAN SHAFT COVER SEAL P (N306DU)
- [SDR DALA2026081304647](https://openairdocs.org/sdr/DALA2026081304647), Aug 11, 2026: Airbus A321271NX. OIL SYSTEM. OVERSERVICED. ON NR 2 ENG START USING GPU, FAINT BURNING RUBBER ODOR IN FLIGHT DECK. DISSIPATED ON TAKE OFF. FOUND ENG 1 SLIGHTLY OVER (N501DA)
- [SDR KY7A20260808001](https://openairdocs.org/sdr/KY7A20260808001), Aug 8, 2026: Swrngn SA227AC. TRANSFER TUBE. OCCLUDED. DURING LANDING ROLLOUT, THE ENGINE LOST OIL PRESSURE, RESULTING IN A LOSS OF POWER AND ENGINE SHUTDOWN. TROUBLESHOOTING  (N542FA)
- [SDR CALA2026080918412](https://openairdocs.org/sdr/CALA2026080918412), Aug 7, 2026: Boeing 7879. CARBON SEAL. LEAKING. OIL QTY INDICATION (ENGINE) SHOWS LOW QTY, DEPLETED TO ZERO 9.5 HRS INTO FLT WITH DROP IN PRESSURE. 18 QUARTS OF OIL WER (N25982)
- [SDR DALA2026080504527](https://openairdocs.org/sdr/DALA2026080504527), Aug 4, 2026: Airbus A321271NX. SPINNER. LEAKING. FUME/ODOR EVENT ON ARRIVER SEVERITY-STRONG IN AFT GALLEY NOTABLE IN COCKPIT NO VISIBLE SMOKE AFT CABIN FELT ILL, NAUSEOU (N513DA)
- [SDR DALA2026080404481](https://openairdocs.org/sdr/DALA2026080404481), Aug 1, 2026: Boeing 757232. TUBE. LEAKING. DECLARED EMERGENCY FOR RIGHT ENGINE ENCOUNTERED A LOSS OF OIL QUANTITY IN FLIGHT. THE LOW PRESSURE LIGHT ILLUMINATED, OI (N67171)
- [SDR DALA2026073004403](https://openairdocs.org/sdr/DALA2026073004403), Jul 28, 2026: Airbus A321271NX. SPINNER. LEAKING. FUME- ON DESCENT INTO SLC FLIGHT CREW NOTICED STRONG DIRTY SOCK SMELL. DONNED O2 MASKS. FOUND OIL CONTAMINATION AND POOL (N584DN)
- [SDR DALA2026072604324](https://openairdocs.org/sdr/DALA2026072604324), Jul 24, 2026: Airbus A321271NX. OIL SYSTEM. OVERSERVICED. AIRCRAFT 5013, AFTER ENGINE SHUT DOWN AT GATE. SELECTED APU BLEED ON. STRONG FUMES ENTERED THE COCKPIT. SMELLED LIKE BUR (N513DA)
- [SDR YQSA20260722001](https://openairdocs.org/sdr/YQSA20260722001), Jul 19, 2026: Cessna 560XL. OIL SYSTEM. EMPTY. N4KS HAD NORMAL STARTS 1ST, 2 LEGS, NORMAL TAKEOFF PROCEDURE AND PREFLIGHT CHK, OILS CHKD & WALK AROUND DONE. TOOK OFF,  (N4KS)
- [SDR AALA202607200796](https://openairdocs.org/sdr/AALA202607200796), Jul 16, 2026: Airbus A321211. OIL CAP. LEAKING. AIRCRAFT WAS NOT GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT DIVERTED TO ORD DUE TO THE FLIGHT CREW REPORTING T (N163US)
- [SDR YENA2026071400573](https://openairdocs.org/sdr/YENA2026071400573), Jul 13, 2026: Airbus A321271NX. SEAL. LEAKING. FLT # 346, BCN-BOS. STRONG ODOR IN COCKPIT AND CABIN STARTING AT 8000 FT (APU OFF) DID NOT DISSIPATE; FOUND ENG 1 INLET  (N4058J)
- [SDR DALA2026071404133](https://openairdocs.org/sdr/DALA2026071404133), Jul 13, 2026: Airbus A321271NX. SEAL. LEAKING. DECLARED EMERGENCY INTO LAX DUE TO PAINT THINNER SMELL. REPLACED NBR 1 ENGINE FAN SHAFT COVER SEAL IAW AMM72-15. REPLACE (N541DE)
- [SDR YENA2026071300565](https://openairdocs.org/sdr/YENA2026071300565), Jul 9, 2026: Airbus A321231. OIL TUBE. TORN. FLT#373, BOS-AUA (DIVERTED TO PLS). AT 31000 FT OIL QTY DROPPED TO 5 QTS SPOKE WITH MCC OIL DROPPED TO 3.5 QTS DIVERTED  (N997JL)
- [SDR YENA2026070600509](https://openairdocs.org/sdr/YENA2026070600509), Jul 5, 2026: Airbus A321271NX. CHIP DETECTOR. ACTIVATED. FLT # 345, BOS-BCN. (ETOPS) "ENG 1 OIL CHIP DETECTED ECAM ( OIL CHIP DETECTED CAUTION ON ECAM E/WD )" (N4074J)
- [SDR 2026FA0000562](https://openairdocs.org/sdr/2026FA0000562), Jul 4, 2026: Mtsbsi MU2B26A. OIL FILTER. CRACKED. THIS OIL FILTER ADAPTER HOUSING WAS REPLACED AT TAE AEROSPACE IN NOVEMBER 2025. IN OCTOBER 2025, OWNER WAS EXPERIENCING  (N892SC)

All 5,122: https://openairdocs.org/jasc/7261/reports.md

## Other codes in chapter 72

- [JASC 7200](https://openairdocs.org/jasc/7200): Engine (Turbine/Turboprop) (14,712 reports)
- [JASC 7210](https://openairdocs.org/jasc/7210): Turbine Engine Reduction Gear (873 reports)
- [JASC 7220](https://openairdocs.org/jasc/7220): Turbine Engine Air Inlet Section (1,718 reports)
- [JASC 7230](https://openairdocs.org/jasc/7230): Turbine Engine Compressor Section (5,063 reports)
- [JASC 7240](https://openairdocs.org/jasc/7240): Turbine Engine Combustion Section (509 reports)
- [JASC 7250](https://openairdocs.org/jasc/7250): Turbine Section (3,623 reports)
- [JASC 7260](https://openairdocs.org/jasc/7260): Turbine Engine Accessory Drive (1,098 reports)
- [JASC 7270](https://openairdocs.org/jasc/7270): Turbine Engine Bypass Section (65 reports)
- [JASC 7297](https://openairdocs.org/jasc/7297): Turbine Engine System Wiring (275 reports)

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