# JASC 7920: Engine Oil Distribution (Airframe Furnished)

- Type: JASC system/component code (FAA)
- ATA chapter: 79 Engine Oil
- Title in the code table: ENGINE OIL DISTRIBUTION (AIRFRAME)
- Service difficulty reports: 734
- FAA code table: https://www.faa.gov/sites/faa.gov/files/JASC_Code.pdf#page=68
- Page: https://openairdocs.org/jasc/7920

## What it covers

The external oil system which distributes engine lubricating oil from the storage tanks to and from the engine. Does not include externally mounted units such as oil coolers, oil filters, shutoff valves. Typical parts are line, hose, coupling, fitting, clamp, etc.

## Service difficulty reports (734, newest 50)

- [SDR DALA2026102105783](https://openairdocs.org/sdr/DALA2026102105783), Oct 21, 2026: Airbus A330941. PUMP. MISCONFIGURED. DIVERTED TO JFK DUE TO THE RT ENGINE OIL PUMP MISCONFIGURATION. REPLACED OIL PUMP. OPS CHECK OK. (9394640) AIRCRAFT WAS  (N405DX)
- [SDR IPXA2026040890099](https://openairdocs.org/sdr/IPXA2026040890099), Apr 8, 2026: Boeing 76734AF. CLAMP. BROKEN. BROKEN CLAMP, NR 1 ENG LOWER D SUMP OIL SUPPLY TUBE FWD SUPPORT. (N352UP)
- [SDR AALA202602175759](https://openairdocs.org/sdr/AALA202602175759), Feb 14, 2026: Boeing 777223. OIL SYSTEM. FAULTED. AIRCRAFT WAS GROUNDED: ENGINE OIL QUANTITY AND PRESSURE ISSUE. DECESION MADE TO DIVERT TO PHX. FLIGHT DID NOT DECLARE EM (N770AN)
- [SDR 3EJA202603240001](https://openairdocs.org/sdr/3EJA202603240001), Feb 4, 2026: Cessna 525B. OIL COOLER. FAILED. RECEIVED RED OIL PRESSURE INDICATION (POINTER AND DIGITS) LEFT ENGINE IN FLIGHT. SHUT DOWN LEFT ENGINE, DECLARED AN EMER (N739JS)
- [SDR DALA2025061404500](https://openairdocs.org/sdr/DALA2025061404500), Jun 14, 2025: Airbus A320212. OIL FILTER. CLOGGED. SHIP 3264 DISC: ABORTED T/O @ 55-60 KTS FOR ENG #1 OIL FILTER CLOG. C/A: FOUND LUBE FILTER AND SCAVENGE FILTER LINE INCO (N364NW)
- [SDR DALA2025061404502](https://openairdocs.org/sdr/DALA2025061404502), Jun 13, 2025: Airbus A320212. OIL FILTER. CLOGGED. SHIP 3264 DISC: ENG#1 OIL CLOGGED ECAM ON TAKEOFF REJECTED TAKEOFF AT 50KTS. C/A: NO FAULT DETECTED. C/W AMDS WORKCARD # (N364NW)
- [SDR AALA202504295150](https://openairdocs.org/sdr/AALA202504295150), Apr 27, 2025: Airbus A319112. MODULE. FAULTY. AIRCRAFT WAS GROUNDED: NUMBER 1 ENGINE LOW OIL PRESSURE. 28-30 PSI AT 93.6N2. RETURNED TO DFW, DID NOT DECLARE EMERGENCY (N776XF)
- [SDR HALA20241227383](https://openairdocs.org/sdr/HALA20241227383), Dec 26, 2024: Airbus A330243. HEAT EXCHANGER. LEAKING. ETOPS - #1 ENG AOHE AND AIR FLOW CONTROL S/N: 3200674-1588 LEAKS OIL FROM HEAT EXCHANGER. REPLACED AOHE PERR AMM 79-21-4 (N379HA)
- [SDR YENA2024090601230](https://openairdocs.org/sdr/YENA2024090601230), Sep 5, 2024: Airbus A321271N. VALVE. FAILED. FLT#263, JFK-SEA. (ETOPS) 'ENG 2 OIL SYS FAULT; T/S PER 79-21-00-810-821A. REPLACED PER AMM 79-21-15 (4069KS) VARIABLE O (N2180J)
- [SDR ASAA2024090252282](https://openairdocs.org/sdr/ASAA2024090252282), Sep 2, 2024: Boeing 7379. WARNING MESSAGE. FALSE ACTIVATION. #1 ENG FILTER BYPASS INFLIGHT, INFLIGHT SHUTDOWN. GROUNDED - YES. ACCOMPLISHED TSR 716465 UP TO STEP 7. FOUND MAGNETIC M (N969AK)
- [SDR YENA2024071601001](https://openairdocs.org/sdr/YENA2024071601001), Jul 13, 2024: Airbus A321231. EIU. FAILED. FLT#1194, MBJ-BOS. 'ENG 2 BEARING 4 OIL SYS HI PRESS- ECAM IN-FLIGHT. ALL ENGINE PARAMETERS NORMAL; REMOVED AND REPLACED (N973JT)
- [SDR COZA20240417143](https://openairdocs.org/sdr/COZA20240417143), Apr 14, 2024: Boeing 737808. LUBRICATION UNIT. LEAKING. AN OIL LEAK WAS FOUND ON THE ENGINE LUBRICATION UNIT WHERE THE AFT SUMP OIL SCAVENGE TUBE CONNECTS TO THE LUBRICATION UN (N778MA)
- [SDR HALA20240229055](https://openairdocs.org/sdr/HALA20240229055), Feb 28, 2024: Airbus A321271N. TUBE. LEAKING. ATB - #1 ENG OIL QTY DROPPED TO ZERO. UPON INSEPCTION NOTICED THE OIL PRESSURE TUBE FROM ENGINE AIR/OIL HEAT EXCHANGER W (N215HA)
- [SDR DALA2024010210768](https://openairdocs.org/sdr/DALA2024010210768), Dec 29, 2023: Bombdr BD1001A10. UNKNOWN. UNKNOWN. SHIP 8139 - DIV, IFSD - DIVERTED TO IAD DUE TO LEFT ENGINE IFSD. FLIGHT CREW RECEIVED LEFT ENGINE OIL DEBRIS ABOVE LIMIT (N139DU)
- [SDR HALA20231223285](https://openairdocs.org/sdr/HALA20231223285), Dec 22, 2023: Airbus A330243. UNKNOWN. UNKNOWN. OTHER - ECAM ENG1 OIL CHIP DETECTED AFTER LANDING. ENG1 OIL CHP DETECTOR GOOD. REPLACED PRECAUTIONARY ENG1 SCAVENGE OIL  (N381HA)
- [SDR AALA202311092474](https://openairdocs.org/sdr/AALA202311092474), Nov 4, 2023: Boeing 777223. BOLT. BROKEN. AIRCRAFT WAS GROUNDED: EXCESSIVE OIL CONSUMPTION ON #1 ENGINE WAS MONITERED BY THE PILOTS SUSPECTING A LEAK. WHEN IT WAS (N758AN)
- [SDR ASAA2023102845930](https://openairdocs.org/sdr/ASAA2023102845930), Oct 28, 2023: Boeing 7379. UNKNOWN. UNKNOWN. TECH SERVICES FOLLOW UP ON URGENT CNR 20231028024 FOR #1 ENG (60A996) CUMULATIVE ODMS CHIP COUNT INCREASE - LOW THRESHOL (N961AK)
- [SDR ASAA2023102045762](https://openairdocs.org/sdr/ASAA2023102045762), Oct 20, 2023: Boeing 7379. UNKNOWN. UNKNOWN. MAINT LIGHT ILLUMINATED AFTER LANDING. GROUNDED - YES. ON DEFERRAL. (N962AK)
- [SDR ASAA2023101945746](https://openairdocs.org/sdr/ASAA2023101945746), Oct 19, 2023: Boeing 7379. SEPARATOR. DAMAGED. #2 ENGINE AIR OIL SEPERATOR NEED REPLACEMENT. GROUNDED - YES. REMOVE AND REPLACED AIR OIL SEPERATOR PER 79-21-21. OPS CH (N937AK)
- [SDR ASAA2023101745763](https://openairdocs.org/sdr/ASAA2023101745763), Oct 17, 2023: Boeing 7379. OIL FILTER. FAULTY. #1 ENGINE IS ALERTING FOR OIL FILTER DELTA PRESSURE INCREASE AND APPROACHING OIL FILTER BYPASS INDICATION. (#PRI1/ETOPS) (N949AK)
- [SDR ASAA2023092645340](https://openairdocs.org/sdr/ASAA2023092645340), Sep 26, 2023: Boeing 7379. PACKING. DAMAGED. OVERHEAD "MAIN" LIGHT ILLUMINATED UPON LANDING/ROLLOUT. GROUNDED - YES. (RESOLVED ON W/O: 1970377 TASKCARD: N/R-00005 )  (N928AK)
- [SDR ASAA2023092045233](https://openairdocs.org/sdr/ASAA2023092045233), Sep 20, 2023: Boeing 7379. UNKNOWN. UNKNOWN. M-50 MATERIAL FOUND IN #2 ENG OIL SAMPLE.*DO NOT OPERATE #2 ENGINE UNTIL AOG ENGINEERING GIVES OK*. GROUNDED - YES. ON D (N972AK)
- [SDR ASAA2023082844831](https://openairdocs.org/sdr/ASAA2023082844831), Aug 28, 2023: Boeing 7379. UNKNOWN. UNKNOWN. MAINT LIGHT ON AFTER LANDING. GROUNDED - YES. C/W FAULT INTEROGATION FOR MX MSG PER AMM 31-65-00. FOUND ENGINE 2 OIL DEB (N926AK)
- [SDR ASAA2023082644802](https://openairdocs.org/sdr/ASAA2023082644802), Aug 26, 2023: Boeing 7379. UNKNOWN. UNKNOWN. AFTER LANDING OVERHEAD MAINT LIGHT CAME ON. GROUNDED - YES. MAINT LIGHT FOR T/R REF PAGE 60644842, ODMG IS FAILED MESSAG (N941AK)
- [SDR ASAA2023082544801](https://openairdocs.org/sdr/ASAA2023082544801), Aug 25, 2023: Boeing 7379. UNKNOWN. UNKNOWN. ON LANDING ROLLOUT MAINT LIGHT ILLUMINATED. GROUNDED - YES. REF W/O #1967096 OM L/P 60665066 FOR TSR714887 #2 ENGINE ODM (N926AK)
- [SDR YENA2023082500992](https://openairdocs.org/sdr/YENA2023082500992), Aug 21, 2023: Airbus A321271N. UNKNOWN. UNKNOWN. FLT#20, LHR-JFK. (ETOPS) 'ENG 1 MAIN OIL FILTER CAP DAMAGED; REMOVED AND REPLACED ENG 1 MAIN OIL FILTER CAP IAW TASK CAR (N4022J)
- [SDR ASAA2023071744085](https://openairdocs.org/sdr/ASAA2023071744085), Jul 17, 2023: Boeing 7379. UNKNOWN. UNKNOWN. TECH SERVICES FOLLOW UP ON URGENT CNR 20230717011 FOR #1 ENG (60A677) CUMULATIVE ODMS CHIP COUNT INCREASE - LOW THRESHOL (N946AK)
- [SDR ASAA2023070543949](https://openairdocs.org/sdr/ASAA2023070543949), Jul 5, 2023: Boeing 7379. CARTRIDGE. UNKNOWN. TECH SERVICES FOLLOW UP ON GE CNR # 20230705063, #2 ENG OIL FILTER APPROACHING BYPASS. GROUNDED - YES. REMOVED AND REPLA (N973AK)
- [SDR ASAA2023062643775](https://openairdocs.org/sdr/ASAA2023062643775), Jun 26, 2023: Boeing 7379. FILTER. FAULTY. #1 ENGINE IS ALERTING FOR OIL FILTER DELTA PRESSURE INCREASE AND APPROACHING OIL FILTER BYPASS INDICATION. (#PRI1) CNR 2 (N977AK)
- [SDR ASAA2023051543303](https://openairdocs.org/sdr/ASAA2023051543303), May 15, 2023: Boeing 7379. OIL FILTER. CONTAMINATED. #1 ENGINE IS ALERTING FOR OIL FILTER DELTA PRESSURE INCREASE AND APPROACHING OIL FILTER BYPASS INDICATION. GROUNDED - YE (N938AK)
- [SDR HALA2023050500101](https://openairdocs.org/sdr/HALA2023050500101), May 4, 2023: Airbus A330243. UNKNOWN. UNKNOWN. ETOPS - ENG 1 OIL CHIP DETECTED. PERFORMED TSM 79-20-00-810-823-A. NO DEBRIS FOUND. CLEANED EMCD #1. EMCD #1 TEST GOOD.  (N396HA)
- [SDR ASAA2023050243102](https://openairdocs.org/sdr/ASAA2023050243102), May 2, 2023: Boeing 7379. SEPARATOR. CONTAMINATED. MAINT LIGHT ON GROUNDED - YES. REMOVED AND REPLACED RH ENGINE OIL SEPARATOR IAW ASA TASK CARD SBLEP-1B-79-00121 . (N961AK)
- [SDR ASAA2023042843058](https://openairdocs.org/sdr/ASAA2023042843058), Apr 28, 2023: Boeing 7379. SENSOR. FAULTY. MAINT OVERHEAD LGT CAME ON JUST AFTER LANDING. GROUNDED - YES. REMOVED AND REPLACED #2 ENG ODMS SENSOR, REF B737-9 AMM 7 (N961AK)
- [SDR ASAA2023042443006](https://openairdocs.org/sdr/ASAA2023042443006), Apr 24, 2023: Boeing 7379. SEPARATOR. FOD. ON LANDING MASTER CAUTION CAME ON WITH MAINT LIGHT ON OVERHEAD. GROUNDED - YES. FOUND FAULT CODES FOR ENGINE #2 ODMS. RE (N943AK)
- [SDR NACA2023033100025](https://openairdocs.org/sdr/NACA2023033100025), Mar 31, 2023: Boeing 767323. UNKNOWN. UNKNOWN. #2 ENGINE - TURBINE REAR FRAME STRUT OIL SUPPLY TUBE LOOSE. REMOVED AND REPLACED OIL SUPPLY TUBE AT TURBINE REAR FRAME S (N321CM)
- [SDR NACA2023033100006](https://openairdocs.org/sdr/NACA2023033100006), Mar 31, 2023: Boeing 767323. UNKNOWN. UNKNOWN. #1 ENGINE D SUMP OIL TUBE CLAMP MISSING. INSTALLED CLAMP AT D SUMP OIL TUBE ON #1 ENG IAW AMM 20-11-00 (N321CM)
- [SDR DALA2023032702335](https://openairdocs.org/sdr/DALA2023032702335), Mar 26, 2023: Airbus BD5001A10. UNKNOWN. UNKNOWN. SHIP 8117 -IFSD/DIV- A/C DIVERTED TO DTW DUE TO LOW QUANTITY/PRESSURE ON LEFT ENGINE, ENGINE WAS SHUT DOWN IN FLIGHT PER (N117DU)
- [SDR ASAA2023022142093](https://openairdocs.org/sdr/ASAA2023022142093), Feb 21, 2023: Boeing 737990ER. EXCHANGER. LEAKING. DURING WALKAROUND, FOUND #2 ENG FUEL LEAK. ACCOMPLISHED ENGINE VENTS & DRAINS INSPECTION REF B737-900 AMM 71-11-00 FOUND (N471AS)
- [SDR ASAA2023021541960](https://openairdocs.org/sdr/ASAA2023021541960), Feb 15, 2023: Boeing 737890. LUBRICATION. LEAKING. TURBINE AFT SUMP SUSPECTED OIL LEAK #1 ENG. #1 ENG OIL CONSUMPTION MAY HAVE BEEN EXCEEDED. GROUNDED - YES. ACCOMPLISHED  (N529AS)
- [SDR ASAA2023021041915](https://openairdocs.org/sdr/ASAA2023021041915), Feb 10, 2023: Boeing 737990ER. ENGINE. NONE. WHEN ACCOMPLISHING ASA TASK CARD 78472040 ON #1 ENGINE, FOUND METAL PARTICLES ON FORWARD SCAVENGE SUMP. THE LARGEST PART (N413AS)
- [SDR ASAA2022111540801](https://openairdocs.org/sdr/ASAA2022111540801), Nov 15, 2022: Boeing 7379. ENGINE. CONTAMINATED. CFM IS REPORTING #1 ENGINE (S/N 60A512) ODMS CHIP COUNT HAS EXPERIENCED AN INCREASE INDICATING A POTENTIAL CONTAMINATION (N941AK)
- [SDR ASAA2022111440789](https://openairdocs.org/sdr/ASAA2022111440789), Nov 14, 2022: Boeing 7379. TRANSMITTER. DIRTY. MAINT LIGHT ILLUMINATED AGAIN AFTER LANDING. GROUNDED - YES. INTERROGATED MTX MESSAGES AND FOUND MSG 79-41192 ENG 1 OIL  (N952AK)
- [SDR ASAA2022111440787](https://openairdocs.org/sdr/ASAA2022111440787), Nov 14, 2022: Boeing 7379. WARNING MESSAGE. FALSE ACTIVATION. MAINT LIGHT ON AFTER LANDING. GROUNDED - YES. FOUND LATCH FAULT CODE 79210351 & 79-42862 PERFORMED B737-9 FIM 679-21-00- (N948AK)
- [SDR YADA2022100301](https://openairdocs.org/sdr/YADA2022100301), Oct 15, 2022: Beech 1900C. NONE. ERODED. DURING UNRELATED MAINTENANCE, AN OIL LEAK WAS DISCOVERED FROM THE LEFT ENGINE. MAINTENANCE IDENTIFIED THE ENGINE OIL SCA (N125AX)
- [SDR ASAA2022100140153](https://openairdocs.org/sdr/ASAA2022100140153), Oct 1, 2022: Boeing 737900ER. EXCHANGER. LEAKING. DURING #2 ENG RUN FOUND MAIN OIL/FUEL HEAT EXCHANGER DRAIN PAD LEAKING AT 7 DROPS PER MINUTE. GROUNDED - YES. REMOVED MA (N407AS)
- [SDR DALA2022092006214](https://openairdocs.org/sdr/DALA2022092006214), Sep 17, 2022: Boeing 767. NONE. NONE. SHIP 181 -ATB/IFSD- LEFT ENGINE SHUTDOWN DUE TO OIL LOSS, ABNORMAL OIL TEMPERATURE, LOW OIL PRESSURE AND VIBRATION. CORR (N181DN)
- [SDR YENA2022090900879](https://openairdocs.org/sdr/YENA2022090900879), Sep 6, 2022: Airbus A321231. NONE. FAILED. FLT#277, FLL-SFO. (AIRCRAFT PERFORMED AN AIR TURN ABCK TO FLL) ' AFTER T/O (+- 2000 ') ECAM FLASHING ADVISORY "LOW OIL"  (N937JB)
- [SDR ASAA2022073039281](https://openairdocs.org/sdr/ASAA2022073039281), Jul 30, 2022: Boeing 737990ER. LUBRICATION UNIT. LEAKING. DURING ENGINE RUN #2, FOUND OIL DRIPPING OUT OF AFT SUMP DRAIN PORT. GROUNDED - YES. REMOVED AND REPLACED #2 ENGINE LUBR (N428AS)
- [SDR ASAA2022070939018](https://openairdocs.org/sdr/ASAA2022070939018), Jul 9, 2022: Boeing 737990ER. EXCHANGER. DEFECTIVE. #2 ENG MAIN OIL/FUEL HEAT EXCHANGER FAILED RUN ON TORQUE CHECK FOR FUEL TUBE ATTACH BOLTS. GROUNDED - YES. REMOVED MAIN  (N472AS)
- [SDR ASAA2022062638835](https://openairdocs.org/sdr/ASAA2022062638835), Jun 26, 2022: Boeing 737990ER. COUPLING. LOOSE. AT FL360, ENG LOW OIL QTY ALERT W/3 QTS INDICATED ON ENG #1. SLOW DECREASE TO ZERO QTY. OIL TEMP SLOW INCREASE TO 105 DE (N402AS)

All 734: https://openairdocs.org/jasc/7920/reports.md

## Other codes in chapter 79

- [JASC 7900](https://openairdocs.org/jasc/7900): Engine Oil System (Airframe Furnished) (260 reports)
- [JASC 7910](https://openairdocs.org/jasc/7910): Engine Oil Storage (Airframe Furnished) (204 reports)
- [JASC 7921](https://openairdocs.org/jasc/7921): Engine Oil Cooler (982 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)

---
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.