# JASC 7900: Engine Oil System (Airframe Furnished)

- Type: JASC system/component code (FAA)
- ATA chapter: 79 Engine Oil
- Title in the code table: ENGINE OIL SYSTEM (AIRFRAME)
- Service difficulty reports: 260
- FAA code table: https://www.faa.gov/sites/faa.gov/files/JASC_Code.pdf#page=68
- Page: https://openairdocs.org/jasc/7900

## What it covers

For general reports of system units external to the engine which store and deliver engine lubricating oil to and from both turbine and reciprocating engines with insufficient information to file in a more specific JASC 7900 series code.

## Service difficulty reports (260, newest 50)

- [SDR 2NSA100326727029](https://openairdocs.org/sdr/2NSA100326727029), Oct 3, 2026: Agusta AW119MKII. BYPASS VALVE. FAILED. PILOT EXPERIENCED RISE IN ENGINE OIL TEMPERATURE DURING STRAIGHT AND LEVEL FLIGHT. PILOT COULD NOT RECTIFY THROUGH INITI (N810MC)
- [SDR QMLA2026090820063](https://openairdocs.org/sdr/QMLA2026090820063), Sep 6, 2026: Urocop EC135P2. SENSOR. FAULTED. ENG OIL TEMP AT MAXIMUM OPERATING RANGES IN FLIGHT, REPLACED ENGINE TEMP SENSOR AND BYPASS VALVE (N137AM)
- [SDR ASAA2026070865689](https://openairdocs.org/sdr/ASAA2026070865689), Jul 8, 2026: Airbus A330243. SAFETY WIRE. BROKEN. ATB : ENG 2 LOW OIL QTY AT FL 320. GROUNDED - YES. FOUND LOOSE CONNECTION AND BROKEN SAFETY WIRE ON THE SCAVENGE PUMP LI (N370HA)
- [SDR FDEA202607030831](https://openairdocs.org/sdr/FDEA202607030831), Jul 3, 2026: Boeing 767300. ENGINE. DAMAGED. BURNED SMELL ON TAKEOFF. SUSPECT OIL LEAK IN HPC. EMERGENCY DECLARED. O2 USED. ENGINE R & R, COMPLETED RT ENG OPS CHECKS (N168FE)
- [SDR DALA2026061603606](https://openairdocs.org/sdr/DALA2026061603606), Jun 15, 2026: Airbus A321271NX. CONDENSER. CONTAMINATED. ATB/FUME - ATB TO LAX DUE TO CONTINUOUS DIRTY SOCK SMELL ON CLIMB IN THE COCKPIT AND AFT CABIN. RAN FUME QRH AND ODORS S (N542DE)
- [SDR 2026FA0000418](https://openairdocs.org/sdr/2026FA0000418), May 17, 2026: Lear 60LEAR. DIPSTICK. UNSECURE. ON 5/17/26, N924PS CYO924 WAS DEPARTING KFOE HEADING TO KHYI. DURING THE CLIMB OUT, THE CAPTAIN NOTICED THE RH ENGINE LO (N924PS)
- [SDR 2026FA0000417](https://openairdocs.org/sdr/2026FA0000417), May 17, 2026: Lear 60LEAR. DIPSTICK. UNSECURE. ON 5/17/26, N924PS CYO924 WAS DEPARTING KFOE HEADING TO KHYI. DURING THE CLIMB OUT, THE CAPTAIN NOTICED THE RH ENGINE LO (N924PS)
- [SDR CALA2026051216190](https://openairdocs.org/sdr/CALA2026051216190), May 11, 2026: Airbus A320232. ENGINE. SMOKE. GRND PERSONNEL REPORTED WHITE SMOKE OUT OF THE LEFT ENGINE WHILE TAXING TO THE GATE. ACCOMPLISHED GENERAL VISUAL INSPECT (N455UA)
- [SDR 2026FA0000340](https://openairdocs.org/sdr/2026FA0000340), May 3, 2026: Agusta AW119MKII. BYPASS VALVE. FAILED. PILOT EXPERIENCED A RISE IN TEMPERATURE DURING FLIGHT, UP TO 114 CELCIUS. PILOT REDUCE POWER AND AIRSPEED TO UNLOAD ENGI (N651MC)
- [SDR CALA2025101410052](https://openairdocs.org/sdr/CALA2025101410052), Oct 12, 2025: Boeing 7379. OIL SYSTEM. LEAKING. OIL LEAKING FROM NR 1 ENG OIL LEAK IS ONLY COMING FROM C-SUMP DRAIN #1 ENG. OIL CONSUMPTION IS BELOW .20 QTS PER HOUR. P (N27503)
- [SDR SWAA2025092417721](https://openairdocs.org/sdr/SWAA2025092417721), Sep 23, 2025: Boeing 7377CT. BYPASS SWITCH. FAULTED. NR 2 ENGINE OIL FILTER BYPASS LIGHT ILLUMINATED IN FLIGHT. DID NOT EXTINGUISH WITH THRUST LEVER RETARDED TO CLOSED. INSP (N7821L)
- [SDR CALA2025072907051](https://openairdocs.org/sdr/CALA2025072907051), Jul 25, 2025: Boeing 737924ER. TRANSMITTER. LEAKING. OIL FILTER BYPASS LIGHT CAME ON AT 34000 QRH REQUIRED ENG 1 TO B E SHUTDOWN. INITIAL EVALUATION BY OCMX. ENG 1 OIL QTY 7 (N67815)
- [SDR SWIA2025072300013](https://openairdocs.org/sdr/SWIA2025072300013), Jul 13, 2025: Cndair CL6002B19. ENGINE. WARNING MESSAGE. ENGINE WARNING MESSAGE ON CLIMB OUT. INTERMITTENT DURING DESCENT AND BACK ON DURING FINAL APPROACH. NOT ON DURING TAXI,  (N959SW)
- [SDR DALA2025062404705](https://openairdocs.org/sdr/DALA2025062404705), Jun 21, 2025: Boeing 737932ER. GEARBOX. DAMAGED. SHIP 3812 -IFSD- ON APPROACH AT FL100 CREW RECEIVED A RIGHT ENGINE OIL FILTER BYPASS INDICATION. QRH WAS PERFORMED AND E (N812DN)
- [SDR DALA2025062204662](https://openairdocs.org/sdr/DALA2025062204662), Jun 20, 2025: Airbus A321271NX. O-RING. LEAKING. AIRCRAFT 5010, DIRTY SOCK SMELL DESCENDING THROUGH 5000 IDLE THRUST. CORRECTIVE ACTION: NBR 2 ENGINE FOUND OIL PUDDLE AT (N510DE)
- [SDR DALA2025052804113](https://openairdocs.org/sdr/DALA2025052804113), May 27, 2025: Airbus A350941. PUMP. FAILED. SHIP 3523 -ATB- DECLARED AN EMERGENCY AND RETURNED TO HND DUE TO LEFT ENGINE LOSS OF OIL QUANTITY AND FLUCTUATION OIL PR (N523DN)
- [SDR SWAA2025052172312](https://openairdocs.org/sdr/SWAA2025052172312), May 17, 2025: Boeing 7377H4. OIL SYSTEM. PRESSURE LOSS. #2 OIL QUANTITY WENT FROM 76% TO 0%. #2 OIL PRESSURE DROPPED IN RED BAND; SHUTDOWN #2 ENGINE IAW QRH. (N239WN)
- [SDR DALA2025042203124](https://openairdocs.org/sdr/DALA2025042203124), Apr 18, 2025: Airbus A321271NX. SPCC. ODOR. SHIP 5011 DURING DEPARTURE F/A IN AFT A/C NOTED AN ODOR. NO OTHER CREW REPORTED ODORS. DISSIPATED AFTER T/O BASED ON A/C (N511DE)
- [SDR AALA202504010096](https://openairdocs.org/sdr/AALA202504010096), Mar 21, 2025: Boeing 737823. HEATER. FAILED. AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: NUMBER 1 ENGINE FAIL (COMPRESSOR STALL), ENGINE 1 SHUTDOWN BY C (N970NN)
- [SDR SWAA2025022196872](https://openairdocs.org/sdr/SWAA2025022196872), Feb 17, 2025: Boeing 7378H4. ENGINE. LEAKING. BEGAN WITH 87% OIL QUANTITY ON ENGINE #2. AFTER TAKEOFF IT WENT TO 1% WITH WHITE BOX. AFTER REDUCING THRUST OIL QUANTITY (N8520Q)
- [SDR CALA2025012402006](https://openairdocs.org/sdr/CALA2025012402006), Jan 21, 2025: Boeing 7878. HEAT EXCHANGER. NOT SEATED. FUEL LEAK LEFT ENGINE ENG1 SN. 956875 (TSI= 15425). LOCAL MAINT REPORTED THAT FUEL STREAMING FROM RHS OF ENG1 MAIN FUEL  (N26910)
- [SDR UIEA2025011900089](https://openairdocs.org/sdr/UIEA2025011900089), Jan 19, 2025: Boeing 74745EF. PACKING. LEAKING. ENG 2 OIL QTY DROPPED FROM 20Q TO 9Q, FOLLOWED BY A DROP FROM 8 TO 7 TO 6 ABOUT EVERY HALF HOUR. FOUND ENG #2 LOW PRESSU (N487MC)
- [SDR YENA2025010300014](https://openairdocs.org/sdr/YENA2025010300014), Jan 2, 2025: Airbus A321271NX. SENSOR. FAILED. FLT#1087, BOS-LAX. (ETOPS) 'ENG 2 FASEC SYS FAULT WITH ENG2 MINOR FAULT, OIL SENSOR FAULT; T/S PER TSM 77-31-00-810-801- (N2180J)
- [SDR DALA2024120511475](https://openairdocs.org/sdr/DALA2024120511475), Dec 1, 2024: Airbus BD5001A11. SEAL. ABNORMAL. MULTIPLE ODOR OBSERVED AT MULTI POWER SETTING ON TAXI OUT."DIRTY SOCK" AND BURNING ODOR ALSO A LITTLE AMOUNT OF SMOKE IN (N311DU)
- [SDR DALA2024120211340](https://openairdocs.org/sdr/DALA2024120211340), Dec 1, 2024: Boeing 737932ER. LINE. LEAKING. SHIP 3864 -IFSD/DIV- DUE TO LEFT ENGINE OIL QUANTITY LOSS AND DECREASING OIL PRESSURE. CORRECTIVE ACTION: FOUND OIL RETU (N864DN)
- [SDR CALA2024082200481](https://openairdocs.org/sdr/CALA2024082200481), Aug 19, 2024: Boeing 777300ER. INDICATION SYS. FAULTED. AC DIVERSION TO HNL. PILOT REPORTED NR 2 ENG OIL QTY LOSS. ACCOMPLISHED SNIFF CHECK OF OIL FOR FUEL ODOR IN OIL SYS IAW  (N2138U)
- [SDR HALA20240819231](https://openairdocs.org/sdr/HALA20240819231), Aug 17, 2024: Airbus A330243. CHIP DETECTOR. ACTIVATED. ETOPS - AFTER ENGINE SHUTDOWN, ECAM ENG 1 OIL CHIP DETECTED. PERFORMED TSM 79-20-00-810-823A. REMOVED AND REPLACED ENG 1 (N381HA)
- [SDR QMLA2024071720087](https://openairdocs.org/sdr/QMLA2024071720087), Jul 17, 2024: Urocop EC135P2. BYPASS VALVE. INOPERATIVE. SCAN OF GAUGES AT PRE-TAKEOFF CHECK SHOWED ALL ENGINE PARAMETERS IN THE NORMAL RANGE. A FEW MILES FROM THE AIRPORT (ABOU (N135CM)
- [SDR ZKFA20240701058](https://openairdocs.org/sdr/ZKFA20240701058), Jul 2, 2024: Braero HAWKER1000. FILTER HOUSING. PULLED. DURING A MAINTENANCE GROUND RUN, THE RT ENGINE DEVELOPED A MAJOR OIL LEAK AND WAS IMMEDIATELY SHUT DOWN. TECHNICIANS DIS (N261PA)
- [SDR DALA2024021201965](https://openairdocs.org/sdr/DALA2024021201965), Feb 10, 2024: Boeing 757351. PUMP. LEAKING. SHIP 5815 ENVIROMENTAL CONTROL SYSTEM SMELLS IN COCKPIT & FWD CABIN. SMELLS LIKE A COELESCER SOCKS NEEDS CHANGING. CORRE (N595NW)
- [SDR 2024FA0000133](https://openairdocs.org/sdr/2024FA0000133), Feb 1, 2024: THERMOSTAT. DETACHED. DURING TAKEOFF PILOT NOTICED LOSS OF ENGINE OIL PRESSURE. THE PILOT SHUT DOWN THE ENGINE IN FLIGHT TO PREVENT ENGINE DAM (N477GT)
- [SDR HALA20240125029](https://openairdocs.org/sdr/HALA20240125029), Jan 24, 2024: Airbus A321271N. SENSOR. FAULTED. ETOPS - ENG 1 N1 AND N2 VIB DISPLAY LOST FOR 30 MIN IN FLT, CAME BACK. (SEEMED TO CORRESPOND WITH ENG I OIL SENSOR FAULT (N227HA)
- [SDR YENA2024012200079](https://openairdocs.org/sdr/YENA2024012200079), Jan 20, 2024: Airbus A321271N. SENSOR. FAILED. FLT#1621, LHR-BOS. (ETOPS) 'ENG 1 OIL SENSOR FAULT;REMOVED AND REPLACED PHMU ON ENG 1 AS PER AMM 77-31-01. OPS TEST GOOD (N4073J)
- [SDR DALA2024010500202](https://openairdocs.org/sdr/DALA2024010500202), Jan 3, 2024: Boeing 757232. UNKNOWN. UNKNOWN. SHIP 0665 -DIV/IFSD/DE- DIVERSION TO TPA DUE TO LEFT ENGINE OIL FILTER ADVISORY MESSAGE. CREW FOLLOWED QRH AND SHUTDOWN  (N665DN)
- [SDR UIEA2023120200972](https://openairdocs.org/sdr/UIEA2023120200972), Dec 2, 2023: Boeing 747481F. SEAL. UNKNOWN. ENGINE 4 OIL QUANTITY 0% IN FLIGHT(<P>OIL LEAKING AT IDG ENG #4. REMOVED THE IDG IAW AMM 24-11-01. REPLACED IDG CARBON S (N404KZ)
- [SDR ANCF20230112036](https://openairdocs.org/sdr/ANCF20230112036), Nov 30, 2023: Boeing 7878. UNKNOWN. UNKNOWN. PILOT/MCC REPORT: 30.NOV.2023 WO 58'308'423 => [MCC] INSPECTION AFTER ENG OIL LEAK - AFTER IN-FLIGHT SHUT DOWN A. PERFOR (N780AV)
- [SDR CALA2023112903496](https://openairdocs.org/sdr/CALA2023112903496), Nov 27, 2023: Airbus A320232. PUMP. DAMAGED. SHUTDOWN ENG NO 2 DUE 2LOW OIL QTY-5.0 QTY. ENG CONTD 2 WINDMILL REMAINING 35 MIN OF FLT. QT CREW REPORTS ENGINE WAS SHU (N415UA)
- [SDR 2023F00335](https://openairdocs.org/sdr/2023F00335), Nov 25, 2023: Boeing 7378Q8. SENSOR. INOPERATIVE. OIL PRESS AMBER BOX SHOWS ON CRUISE ENGINE NR 2. CORRECTIVE ACTION. OIL PRESSURE SENSOR REMOVED AND REPLACED
- [SDR YENA2023112701456](https://openairdocs.org/sdr/YENA2023112701456), Nov 24, 2023: Airbus A320232. PUMP. FAILED. FLT#488, MCO-ORH. (AIRCRAFT DIVERTED TO BOS) 'AFTER TAKE OFF AND IN CLIMB ENGINE 2 OIL PSI INDICATIONS FLUCTUATED BETWEE (N643JB)
- [SDR DALA2023112709698](https://openairdocs.org/sdr/DALA2023112709698), Nov 23, 2023: Boeing 757351. UNKNOWN. UNKNOWN. SHIP 5808 -ATO- DISCONTINUED TAKEOFF AT APPROXIMATELY 100 KNOTS DUE TO L ENG OIL PRESSURE RED INDICATION. CORRECTIVE ACT (N588NW)
- [SDR HALA20231124256](https://openairdocs.org/sdr/HALA20231124256), Nov 23, 2023: Airbus A330243. UNKNOWN. UNKNOWN. ETOPS - ECAM ENG1 OIL CHIP DETECTED AFTER LANDING. PERFORMED TSM 79-20-00-810-823-A. FOUND & COLLECTED MINISCUAL DEBRIS  (N393HA)
- [SDR HALA20231122253](https://openairdocs.org/sdr/HALA20231122253), Nov 21, 2023: Airbus A321271N. UNKNOWN. UNKNOWN. ETOPS - ENG 1 OIL CHIP DETECTED ECAM AFTER LANDING. PERFORMED MAGNETIC CHIP INSPECTION PER AIRBUS TSM 79-35-00-810A-808A (N230HA)
- [SDR HALA20231121251](https://openairdocs.org/sdr/HALA20231121251), Nov 20, 2023: Airbus A321271N. UNKNOWN. UNKNOWN. ETOPS - ENG 1 OIL CHIP DETECTED. PERFORMED MAGNETIC CHIP INSPECTION PER AMM 79-00-00-281-802A. NO DEBRI FOUND-CHECK GOOD (N230HA)
- [SDR ASAA2023101945736](https://openairdocs.org/sdr/ASAA2023101945736), Oct 19, 2023: Boeing 737890. SCREEN. DAMAGED. WHILE ACCOMPLISHING .T/C 78472040 FOUND CHIP DETECTOR SCREEN ON AGB/TGB MCO TO BE DAMAGED. GROUNDED - YES. INSTALLED NEW (N593AS)
- [SDR QMLA2023101220088](https://openairdocs.org/sdr/QMLA2023101220088), Oct 12, 2023: Bell 407. UNKNOWN. UNKNOWN. ENGINE OIL PRESSURE LIGHT ILLUMINATED SHORTLY AFTER TAKE OFF. LIGHT FLICKERED A COUPLE OF TIMES, THAN STAYED ILLUMINATED (N776AL)
- [SDR ASAA2023101145596](https://openairdocs.org/sdr/ASAA2023101145596), Oct 11, 2023: Boeing 7379. UNKNOWN. UNKNOWN. "MAINT" LIGHT ON AFT OVERHEAD PANEL ILLUMINATED AFTER LANDING. GROUNDED - YES. (RESOLVED ON W/O: 1973312 TASKCARD: N/R-0 (N962AK)
- [SDR DALA2023100808254](https://openairdocs.org/sdr/DALA2023100808254), Oct 7, 2023: Boeing 767432ER. UNKNOWN. UNKNOWN. SHIP 1801 - DIV - CREW REPORTED LOSS OF OIL FROM RIGHT ENGINE AT A RATE OF 1 QUART/30 MINUTES. OUT OF AN ABUNDANCE OF PR (N825MH)
- [SDR DALA2023092607928](https://openairdocs.org/sdr/DALA2023092607928), Sep 26, 2023: Airbus A330941. UNKNOWN. UNKNOWN. SHIP 3406 - DIV/DE - AIRCRAFT DIVERTED TO MCI AND CREW DECLARED EMERGENCY DUE TO RIGHT ENGINE OIL QUANTITY LOSS WITH OIL (N406DX)
- [SDR 2023F00288](https://openairdocs.org/sdr/2023F00288), Sep 25, 2023: Skrsky S92A. DETECTOR. INOPERATIVE. DURING CRUISE, #1 ENGINE OIL TEMPERATURE WENT INTO THE YELLOW. RTB VIA OEI PROFILE TERMINATING AT HBP (N592PH)
- [SDR YENA2023091901111](https://openairdocs.org/sdr/YENA2023091901111), Sep 16, 2023: Airbus A321271N. UNKNOWN. UNKNOWN. FLT#20, LHR-JFK. (ETOPS) 'AFTER LANDING ECAM ENG 2 OIL CHIP DETECTED; REF LOG PAGE 3793104 (MX ACKNOWLEDGE EVF SUCCESSFU (N4048J)

All 260: https://openairdocs.org/jasc/7900/reports.md

## Airworthiness concern sheets (1)

- [AIR750-2019-04-S-7900-ACS](https://openairdocs.org/acs/AIR750-2019-04-S-7900-ACS): Engine Oil Cooler Hoses. Issued Aug 5, 2019

## Other codes in chapter 79

- [JASC 7910](https://openairdocs.org/jasc/7910): Engine Oil Storage (Airframe Furnished) (204 reports)
- [JASC 7920](https://openairdocs.org/jasc/7920): Engine Oil Distribution (Airframe Furnished) (733 reports)
- [JASC 7921](https://openairdocs.org/jasc/7921): Engine Oil Cooler (981 reports)
- [JASC 7922](https://openairdocs.org/jasc/7922): Engine Oil Temperature Regulator (268 reports)
- [JASC 7923](https://openairdocs.org/jasc/7923): Engine Oil Shutoff Valve (25 reports)
- [JASC 7930](https://openairdocs.org/jasc/7930): Engine Oil Indicating System (1,286 reports)
- [JASC 7931](https://openairdocs.org/jasc/7931): Engine Oil Pressure (1,875 reports)
- [JASC 7932](https://openairdocs.org/jasc/7932): Engine Oil Quantity (217 reports)
- [JASC 7933](https://openairdocs.org/jasc/7933): Engine Oil Temperature (499 reports)
- [JASC 7997](https://openairdocs.org/jasc/7997): Engine Oil System Wiring (236 reports)

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