# Service difficulty reports: CFM International CFM56-7B20 series

A list on [CFM International CFM56-7B20 series](https://openairdocs.org/engine/cfm-international-cfm56-7b20-series.md).

Newest first. General aviation reporting is voluntary.

Page 1 of 4 · 188 reports

- [SDR 2026FA0000777](https://openairdocs.org/sdr/2026FA0000777.md): Bellcrank · cracked · Sep 19, 2026 · N330AR · Boeing 7377Q8 · Compressor Bleed Control
  > RETURN TO BLOCKS DUE TO ENGINE CONTROL WARNING, NR 2 ENGINE FRM 730 010 52. REPLACED BELLCRANK ASSY AT LT VSV ACTUATOR IN ENGINE 2 IAW AMM 73-31-01-800-005-F00 DURING TEST NORMAL.
- [SDR AALA202609044092](https://openairdocs.org/sdr/AALA202609044092.md): Packing · worn · Sep 2, 2026 · N913NN · Boeing 737823 · Turbine Engine Oil System
  > AIRCRAFT WAS GROUNDED: WHILE PERFORMING TROUBLESHOOTING WORK CARD 08L00021001(SMOKE ODOR FUMES INITIAL) FOUND #2 ENGINE OIL LEAK BETWEEN FAN SPINNER AND BOOSTER SECTION (E NG. CORE). FOUND OIL INSIDE THE BOOSTER SECTION AND TR COOL STREAM SECTION. REMOVED SP
- [SDR 2026FA0000679](https://openairdocs.org/sdr/2026FA0000679.md): Engine · damaged · Aug 31, 2026 · Boeing 7377Q8 · Engine (Turbine/Turboprop)
  > SEVERE DAMAGE NR 1 ENGINE, DURING CLIMB. FLIGHT 739 GRU/VVI. QRF TO DEPARTURE AIRPORT. TURBINE DAMAGES UNDER EVALUATION
- [SDR AALA202603240681](https://openairdocs.org/sdr/AALA202603240681.md): Engine · power loss · Mar 23, 2026 · N924AN · Boeing 737823 · Engine (Turbine/Turboprop)
  > AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: LEVELING OFF AT FL310 NR 1 ENGINE N1 DIPPED AND SURGED AT LEAST 3 TIMES. THIS WAS ACCOMPANIED BY A BANGING NOISE HEARD IN THE COCKTAIL. FLIGHT ATTENDANT REPORTED SEEING SPARKS COMING FROM THE NR 1 ENGINE
- [SDR AALA202603270681](https://openairdocs.org/sdr/AALA202603270681.md): Engine · failed · Mar 23, 2026 · N924AN · Boeing 737823 · Engine (Turbine/Turboprop)
  > AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: LEVELING OFF AT FL310 NUMBER 1 ENGINE N1 DIPPED AND SURGED AT LEAST 3 TIMES. THIS WAS ACCOMPANIED BY A BANGING NOISE HEARD IN THE COCKTAIL. FLIGHT ATTENDANT REPORTED SEEING SPARKS COMING FROM THE NUMBER
- [SDR AALA202603202254](https://openairdocs.org/sdr/AALA202603202254.md): Engine · vibration · Mar 19, 2026 · N897NN · Boeing 737823 · Engine (Turbine/Turboprop)
  > AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS NOT DECLARED DUE TO: DURING CLIMBOUT NUMBER 1 ENGINE VIBRATIONS FLUCTUATED WILDLY OSCILLATING BETWEEN 2.0 AND 3.5, ENGINE NUMBER 1 HAVING VIBRATIONS ISSUES RECENTLY. AIRCRAFT AIR INTERRUPTED BACK TO AND LANDED SAFELY AT
- [SDR AALA202603252254](https://openairdocs.org/sdr/AALA202603252254.md): Engine · failed · Mar 19, 2026 · N897NN · Boeing 737823 · Engine (Turbine/Turboprop)
  > AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS NOT DECLARED DUE TO: DURING CLIMBOUT NUMBER 1 ENGINE VIBRATIONS FLUCTUATED WILDLY OSCILLATING BETWEEN 2.0 AND 3.5, ENGINE NUMBER 1 HAVING VIBRATIONS ISSUES RECENTLY. AIRCRAFT AIR INTERRUPTED BACK TO AND LANDED SAFELY AT
- [SDR AALA202603060469](https://openairdocs.org/sdr/AALA202603060469.md): Compressor · stalled · Mar 5, 2026 · N907NN · Boeing 737823 · Turbine Engine Compressor Section
  > AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: AT APPROXIMATELY FL 310 IN CLIMB, ENGINE NR 2 FAILED AFTER SEVERE VIBRATIONS AND COMPRESSORS STALL. AIRCRAFT AIR INTERRUPTED BACK TO AND LANDED SAFELY AT SAL.
- [SDR AALA202603060177](https://openairdocs.org/sdr/AALA202603060177.md): Engine · failed · Mar 5, 2026 · N907NN · Boeing 737823 · Turbine Engine Compressor Section
  > AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: AT APPROXIMATELY FL 310 IN CLIMB, ENGINE NR 2 FAILED AFTER SEVERE VIBRATIONS AND COMPRESSORS STALL. AIRCRAFT AIR INTERRUPTED BACK TO AND LANDED SAFELY AT SAL. (OPEN).
- [SDR AALA202603100469](https://openairdocs.org/sdr/AALA202603100469.md): Hmu · faulted · Mar 5, 2026 · N907NN · Boeing 737823 · Turbine Engine Compressor Section
  > AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: AT APPROXIMATELY FL 310 IN CLIMB, ENGINE NUMBER 2 FAILED AFTER SEVERE VIBRATIONS AND COMPRESSORS STALL. AIRCRAFT AIR INTERRUPTED BACK TO AND LANDED SAFELY AT SAL. ACCOMPLISHED AMM 71-00-00-210-801-F00
- [SDR AALA202603041151](https://openairdocs.org/sdr/AALA202603041151.md): Engine · overtemp · Feb 28, 2026 · N907NN · Boeing 737823 · Engine (Turbine/Turboprop)
  > AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: NR 2 ENGINE FAILURE AT APPROXIMATELY 28,000 FEET, EGT RED LINE WITH TEMP 987 AND ENGINE FAILURE ANNUNCIATION, POST FLIGHT INSPECTION FOUND EXHAUST TURBINE IN PIECES. AIRCRAFT AIR INTERRUPTED BACK TO AND
- [SDR AALA202603042392](https://openairdocs.org/sdr/AALA202603042392.md): Oil System · leaking · Feb 21, 2026 · N935NN · Boeing 737823 · Turbine Engine Oil System
  > AIRCRAFT WAS GROUNDED: THE FLIGHT ATTENDANTS REPORTED ODOR IN THE AFT CABIN DURING TAKEOFF AND LASTED ABOUT 5 MINUTES. ODOR DESCRIBED TO SMELL LIKE DIRTY SOCKS. TROUBLESHOT SOF EVENT PER WORKCARD 08L00021001. FOUND NUMBER 2 ENGINE TO BE THE SOURCE OF THE OIL A
- [SDR AALA202601122535](https://openairdocs.org/sdr/AALA202601122535.md): Duct · failed · Jan 9, 2026 · N889NN · Boeing 737823 · Engine Anti-Icing System
  > AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: ON CLIMB OUT THE ENGINE ANTI-ICE COWL VALVE LIGHT ILLUMINATED AND REMAINED BRIGHT BLUE AND THE AMBER LIGHT WAS ON. AIRCRAFT DIVERTED TO AND LANDED SAFELY AT PHX. REMOVED AND REPLACED NUMBER 2 ENGINE COW
- [SDR AALA202512293268](https://openairdocs.org/sdr/AALA202512293268.md): Oil System · leaking · Dec 23, 2025 · N956NN · Boeing 737823 · Turbine Engine Oil System
  > AIRCRAFT WAS GROUNDED: STRONG ODOR REPORTED BY NR 2 FLIGHT ATTENDANT DESCENDING THROUGH 8,000 FEET. NO ODOR IN THE FLIGHT DECK. ALL FLIGHT ATTENDANTS MENTIONED SIMILAR SMELL ON TAKE OFF ODOR SIMILAR TO DIRTY SOCKS OR WET DOG SMELL. MAINTENANCE FOUND THE #2 ENG
- [SDR AALA202512196384](https://openairdocs.org/sdr/AALA202512196384.md): Warning Message · illuminated · Dec 18, 2025 · N301NW · Boeing 737823 · Turbine Engine Oil System
  > AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: DURING CRUISE NEAR TOP OF DECENT AT FL210, #1 ENGINE OIL QUANTITY INDICATED 0, SHUTDOWN NUMBER 1 ENGINE. AIRCRAFT EMERGENCY LANDED SAFELY AT OMA. (OPEN).
- [SDR AALA202510301497](https://openairdocs.org/sdr/AALA202510301497.md): Engine · contaminated · Oct 28, 2025 · N342PM · Boeing 737823 · Powerplant System
  > AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: ODOR THROUGHOUT THE WHOLE CABIN. AIRCRAFT AIR INTERRUPTED BACK TO AND LANDED SAFELY AT MIA. ACCOMPLISHED BIRD STRIKE INSP. PER J/C08L00005056. ALSO ECO WASHON ENGINE NUMBER 2 PER J/C 08L40072009 AN SOF T
- [SDR AALA202510304348](https://openairdocs.org/sdr/AALA202510304348.md): Engine · failed · Oct 26, 2025 · N993NN · Boeing 737823 · Engine (Turbine/Turboprop)
  > AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: NUMBER 2 ENGINE SHUT DOWN IN FLIGHT DUE TO LOSS OF OIL QUANTITY THEN LOSS OF OIL PRESSURE. AIRCRAFT EMERGENCY LANDED SAFELY AT CLT. REMOVED AND REPLACED NUMBER 2 ENGINE. PER J/C 08L40072003. ALL OPERATIO
- [SDR AALA202509304096](https://openairdocs.org/sdr/AALA202509304096.md): Engine · vibration · Sep 29, 2025 · N924AN · Boeing 737823 · Engine (Turbine/Turboprop)
  > AIRCRAFT WAS GROUNDED: AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: UPON THROTTLE REDUCTION AT TOP OF DESCENT, ENGINE NUMBER 2 DEVELOPED STRONG VIBRATION. AIRCRAFT EMERGENCY LANDED SAFELY AT RSW. ACCOMPLISHED NR 2 ENGINE RUN FOR 20 MINUTES DUE TO I
- [SDR AALA202510021275](https://openairdocs.org/sdr/AALA202510021275.md): Pump · inoperative · Sep 28, 2025 · N973NN · Boeing 737823 · Engine Fuel Pump
  > AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: AFTER TAKEOFF N1 HAD A 7 PERCENT SPLIT AND ENGINE SHUTDOWN ON ITSELF. AIRCRAFT AIR INTERRUPTED BACK TO AND LANDED SAFELY AT ORD. REMOVED AND REPLACED ENGINE FUEL PUMP PACKAGE (AALA202509307020). ALSO, N
- [SDR AALA202510027020](https://openairdocs.org/sdr/AALA202510027020.md): Packing · deteriorated · Sep 28, 2025 · N973NN · Boeing 737823 · Engine Fuel Pump
  > AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: AFTER TAKEOFF N1 HAD A 7 PERCENT SPLIT AND ENGINE SHUTDOWN ON ITSELF. AIRCRAFT AIR INTERRUPTED BACK TO AND LANDED SAFELY AT ORD. REMOVED AND REPLACED ENGINE FUEL PUMP PACKAGE (AALA202509307020). ALSO, N
- [SDR AALA202510076932](https://openairdocs.org/sdr/AALA202510076932.md): Engine · odor · Sep 25, 2025 · N897NN · Boeing 737823 · Engine (Turbine/Turboprop)
  > AIRCRAFT WAS GROUNDED: DURING TAKEOFF OUT OF DCA THERE WAS A VERY STRONG DIRTY, MUSTY, AND OILY SMELL THROUGH OUT THE ENTIRE AIRCRAFT. REMOVED AND REPLACED NUMBER 1 ENGINE. PER JOBCARD 08L40072003. REMOVE AND REPLACED LEFT (AALA202510070691) AND RIGHT (AALA2
- [SDR SWAA2025091514598](https://openairdocs.org/sdr/SWAA2025091514598.md): Fuel Filter · bypassing · Sep 11, 2025 · N7880D · Boeing 7377K5 · Fuel Controlling System
  > NUMBER 2 ENGING FUEL FILTER BYPASS LIGHT ILLUMINATED, FILTER R & R AT DEFERRAL. ITEM OK TO CONTINUE PER MEL 73-4-01 SP1. REMOVED AND REPLACED FUEL FILTER IAW MM 73-11-02; NR 2 ENG EEC BITE NO FAULTS FOUND.
- [SDR CALA2025082708193](https://openairdocs.org/sdr/CALA2025082708193.md): Transducer · faulted · Aug 26, 2025 · N87512 · Boeing 737824 · Engine Thrust Reverser
  > ELECTRONIC ENGINE CONTROL (EEC) RECENT FAULTS BITE TEST {B737-73-3-0068} - FOUND LONG TIME MAINTENANCE MESSAGE 78-11491 THE RT REVERSER SLEEVE IS OUT OF RANGE ON ENGINE NR 1, MX WORKED EEC FAULT ON L/P 5753712 IN WHICH FAULT WAS 78-31491 DUAL CHANNEL FAULT FOR
- [SDR AALA202508222533](https://openairdocs.org/sdr/AALA202508222533.md): Hmu · failed · Aug 21, 2025 · N805NN · Boeing 737823 · Fuel Control/Turbine Engines
  > AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: AT 37K FEET OVER CUBA, NUMBER 1 ENGINE ROLLED BACK TO 40-50% N1. AUTO THROTTLES DISENGAGED. AIRCRAFT AIR INTERRUPTED BACK TO AND LANDED SAFELY AT MIA. REMOVED AND REPLACED (HMU)-HYDROMECHANICAL UNIT LEFT
- [SDR AALA202507176580](https://openairdocs.org/sdr/AALA202507176580.md): Oil System · leaking · Jul 14, 2025 · N895NN · Boeing 737823 · Turbine Engine Oil System
  > AIRCRAFT WAS GROUNDED: STRONG SMELL ON TAKEOFF ROLL, SIMILAR TO DIRTY SOCKS. NOTICABLE AT 40% N1, BECAME WORSE AS WE INCREASED THRUST. EVIDENCE OF OIL WAS FOUND ON THE STAGE 3 BOOSTER BLADES AND EVIDENCE OF SIGNIFICANT COKING WAS PRESENT ON THE STAGE 4 GUIDE
- [SDR AALA202507149372](https://openairdocs.org/sdr/AALA202507149372.md): Engine · flamed out · Jul 10, 2025 · N859NN · Boeing 737823 · Engine (Turbine/Turboprop)
  > AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: FLAMEOUT OF ENGINE NUMBER 1 AFTER LEVELING OFF AT FL370. THERE WAS NO OTHER INDICATIONS THAN A "ROLL BACK" OF N1 AND COMMAND SYSTEM-A DISCONNECTING. AIRCRAFT AIR INTERRUPTED BACK TO AND LANDED SAFELY AT
- [SDR AALA202507179372](https://openairdocs.org/sdr/AALA202507179372.md): Engine · flamed out · Jul 10, 2025 · N859NN · Boeing 737823 · Engine (Turbine/Turboprop)
  > AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: FLAMEOUT OF ENGINE NUMBER 1 AFTER LEVELING OFF AT FL370. THERE WAS NO OTHER INDICATIONS THAN A "ROLL BACK" OF N1 AND COMMAND SYSTEM-A DISCONNECTING. AIRCRAFT AIR INTERRUPTED BACK TO AND LANDED SAFELY AT
- [SDR AALA202506306224](https://openairdocs.org/sdr/AALA202506306224.md): Oil System · low pressure · Jun 28, 2025 · N938NN · Boeing 737823 · Engine Oil Pressure
  > AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: INFLIGHT ENGINE SHUTDOWN DUE TO LOW OIL PRESSURE ON NUMBER 1 ENGINE. AIRCRAFT DIVERTED TO AND LANDED SAFELY AT CHA. (OPEN).
- [SDR AALA202507086224](https://openairdocs.org/sdr/AALA202507086224.md): Engine · shutdown · Jun 28, 2025 · N938NN · Boeing 737823 · Engine (Turbine/Turboprop)
  > AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: INFLIGHT ENGINE SHUTDOWN DUE TO LOW OIL PRESSURE ON NUMBER 1 ENGINE. AIRCRAFT DIVERTED TO AND LANDED SAFELY AT CHA. ACCOMPLISHED ENGINE CHANGE.
- [SDR AALA202506302410](https://openairdocs.org/sdr/AALA202506302410.md): Engine · overtemp · Jun 27, 2025 · N804NN · Boeing 737823 · Engine EGT/TIT Indicating System
  > AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: EGT OVER TEMP ON THE NUMBER 2 ENGINE. AIRCRAFT DIVERTED TO AND LANDED SAFELY AT DFW. ACCOMPLISHED AMM 71-00-00-800-804-F00 AND CONTACTED ENGINE DESK FOUND NUMBER 2 ENGINE EXCEEDANCE IN AREA "B" NO EEC FA
- [SDR AALA202506246217](https://openairdocs.org/sdr/AALA202506246217.md): Engine · power loss · Jun 22, 2025 · N938NN · Boeing 737823 · Engine (Turbine/Turboprop)
  > AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: SHORTLY AFTER TURNING OFF THE LEFT PACK FOR BLEED, THE TRIP NUMBER 1 ENGINE ROLLED BACK WITH ACCOMPANYING THUMPING AND CLUNKING SOUND. WITH ENGINE AT IDLE, ENGINE INDICATIONS WERE NORMAL. WHEN POWER IS A
- [SDR AALA202506240445](https://openairdocs.org/sdr/AALA202506240445.md): Regulator · failed · Jun 22, 2025 · N938NN · Boeing 737823 · Compressor Bleed Valve
  > AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: SHORTLY AFTER TURNING OFF THE LEFT PACK FOR BLEED, THE TRIP NUMBER 1 ENGINE ROLLED BACK WITH ACCOMPANYING THUMPING AND CLUNKING SOUND. WITH ENGINE AT IDLE, ENGINE INDICATIONS WERE NORMAL. WHEN POWER IS A
- [SDR AALA202506250435](https://openairdocs.org/sdr/AALA202506250435.md): Engine · power loss · Jun 22, 2025 · N802NN · Boeing 737823 · Engine (Turbine/Turboprop)
  > AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: ENGINE NUMBER 1 INCREASED TO RED LINE ON N1 WITH THRUST LEVERS BACK, WHILE DESCENDING, THRUST LEVER WENT TO IDLE BUT N1 STAYED AT MAX POWER AND INCREASING, HAD TO SHUTDOWN THE NUMBER 1 ENGINE. AIRCRAFT E
- [SDR AALA202505296757](https://openairdocs.org/sdr/AALA202505296757.md): Wire Harness · faulted · May 26, 2025 · N913NN · Boeing 737823 · Turbine Engine System Wiring
  > AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS NOT DECLARED DUE TO: LEFT DUCT PRESSURE WENT TO ZERO AFTER TAKEOFF, N1 SPLIT UP TO 4%, REPEAT WRITE UP. AIRCRAFT AIR INTERRUPTED BACK TO AND LANDED SAFELY AT DFW. REMOVED AND REPLACED MW0311 HARNESS ON LEFT ENGINE. OPER
- [SDR SWAA2025052172112](https://openairdocs.org/sdr/SWAA2025052172112.md): Engine · making metal · May 17, 2025 · N7859B · Boeing 7377Q8 · Engine (Turbine/Turboprop)
  > NR 2 ENGINE OIL FILTER BYPASS LIGHT. PERFORMED FIM TASK 79-05 TASK 817. FOUND NO DISAGREE MESSAGES & NO CLOGGED STATE. PERFORMED PARAG E STEP 3 (C), INSPECTED CHIP DETECTOR IAW AMM 79-00-00-200-804-F00. FOUND LARGE CHUNKS OF METAL INSIDE SCAVENGE SCREEN FR
- [SDR AALA202505011774](https://openairdocs.org/sdr/AALA202505011774.md): Oil System · low · Apr 26, 2025 · N986NN · Boeing 737823 · Turbine Engine Oil System
  > AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: OIL QUANTITY AND PRESSURE DROPPED BELOW 5 QUARTS; SHUTDOWN NUMBNER 1 ENGINE AS A PRECAUTION. AIRCRAFT AIR INTERRUPTED BACK TO AND LANDED SAFELY AT ATL. **SUPPLEMENTAL REPORT FOR (AALA202504281774): REMOV
- [SDR AALA202504168827](https://openairdocs.org/sdr/AALA202504168827.md): Engine · failed · Apr 15, 2025 · N948NN · Boeing 737823 · Engine (Turbine/Turboprop)
  > AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: VIOLENT ENGINE FAILURE ON NUMBER 2 ENGINE DURING CLIMB THROUGH FL240. AIRCRAFT AIR INTERRUPTED BACK TO AND LANDED SAFELY AT LAX. **SUPPLEMENTAL REPORT WILL BE SUBMITTED**(OPEN).
- [SDR DALA2025041703014](https://openairdocs.org/sdr/DALA2025041703014.md): Clamp · loose · Apr 15, 2025 · N892DN · Boeing 737932ER · Engine Bleed Air System
  > SHIP 3892 -ATB- RETURNED TO TUS DUE TO LT ENG OVERHEAT INDICATION AFTER TAKEOFF. CORRECTIVE ACTION: MTC FOUND PRSOV LOWER CLAMP LOOSE. TOURQUED CLAMP, RAN ENGINE, NO LEAKS OR OVERHEATS. AIRCRAFT RETURNED TO SERVICE.
- [SDR AALA202504018424](https://openairdocs.org/sdr/AALA202504018424.md): Seal · leaking · Mar 22, 2025 · N871NN · Boeing 737823 · Turbine Engine Oil System
  > AIRCRAFT WAS GROUNDED: ON TAKE OFF ROLL, A STRONG MUSTY SMELL NOTICED IN FLIGHT DECK ONLY. REMOVE AND REPLACED STARTER (AALA202503242799) AND DRIVE PAD SEAL (AALA202504018424), PER EA 363229. LEAK CHECKS GOOD.
- [SDR AALA202504012799](https://openairdocs.org/sdr/AALA202504012799.md): Starter · leaking · Mar 22, 2025 · N871NN · Boeing 737823 · Turbine Engine Oil System
  > AIRCRAFT WAS GROUNDED: ON TAKE OFF ROLL, A STRONG MUSTY SMELL NOTICED IN FLIGHT DECK ONLY. **SUPPLEMENTAL REPORT FOR (AALA202503242799): REMOVE AND REPLACED STARTER (AALA202503242799) AND DRIVE PAD SEAL (AALA202504018424), PER EA 363229. LEAK CHECKS GOOD**(CLO
- [SDR AALA202503240627](https://openairdocs.org/sdr/AALA202503240627.md): Compressor · stalled · Mar 21, 2025 · N970NN · Boeing 737823 · Engine (Turbine/Turboprop)
  > AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: NUMBER 1 ENGINE FAIL (COMPRESSOR STALL), ENGINE 1 SHUTDOWN BY CREW IN DESCENT; AIRCRAFT DIVERTED TO AND LANDED SAFELY AT MIA. **SUPPLEMENTAL REPORT WILL BE SUBMITTED**(OPEN).
- [SDR AALA202504010627](https://openairdocs.org/sdr/AALA202504010627.md): Hmu · failed · Mar 21, 2025 · N970NN · Boeing 737823 · Fuel Controlling System
  > AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: NUMBER 1 ENGINE FAIL (COMPRESSOR STALL), ENGINE 1 SHUTDOWN BY CREW IN DESCENT; AIRCRAFT DIVERTED TO AND LANDED SAFELY AT MIA. REMOVED AND REPLACED HMU-HYDROMECHANICAL UNIT (AALA202503240627), PER JC 08L
- [SDR AALA202504011909](https://openairdocs.org/sdr/AALA202504011909.md): Heater · failed · Mar 21, 2025 · N970NN · Boeing 737823 · Engine Oil Cooler
  > AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: NUMBER 1 ENGINE FAIL (COMPRESSOR STALL), ENGINE 1 SHUTDOWN BY CREW IN DESCENT; AIRCRAFT DIVERTED TO AND LANDED SAFELY AT MIA. **SUPPLEMENTAL REPORT FOR (AALA202503240627): REMOVED AND REPLACED HMU-HYDROM
- [SDR AALA202504010096](https://openairdocs.org/sdr/AALA202504010096.md): Heater · failed · Mar 21, 2025 · N970NN · Boeing 737823 · Engine Oil System (Airframe Furnished)
  > AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: NUMBER 1 ENGINE FAIL (COMPRESSOR STALL), ENGINE 1 SHUTDOWN BY CREW IN DESCENT; AIRCRAFT DIVERTED TO AND LANDED SAFELY AT MIA. REMOVED AND REPLACED HMU-HYDROMECHANICAL UNIT (AALA202503240627), PER JC 08
- [SDR SWAA2025032007748](https://openairdocs.org/sdr/SWAA2025032007748.md): Module · low pressure · Mar 18, 2025 · N7876A · Boeing 7377Q8 · Hydraulic Power Accumulator, Main
  > AFTER FLAPS 5 HYD A SYSTEM LOOW PRESSURE LIGHTS ON BOTH ENG AND ELECTRIC PUMP SHORTLY AFTER LOW PRESSURE LIGHTS ON HYD SYSTEM A CAME ON. SYS A QTY WENT TO 0. WE GOT EXTENDED VECTORS RAN QRH FOR LOSS OF SYSTEM A. RAN NON NORMAL LANDING DATA AND ALTERNATE EXTEND
- [SDR SWAA2025032007747](https://openairdocs.org/sdr/SWAA2025032007747.md): Filter · low pressure · Mar 18, 2025 · N7876A · Boeing 7377Q8 · Hydraulic Filter, Auxiliary
  > AFTER FLAPS 5 HYD A SYSTEM LOW PRESSURE LIGHTS ON BOTH ENG AND ELECTRIC PUMP SHORTLY AFTER LOW PRESSURE LIGHTS ON HYD SYSTEM A CAME ON. SYS A QTY WENT TO 0. WE GOT EXTENDED VECTORS RAN QRH FOR LOSS OF SYSTEM A. RAN NON NORMAL LANDING DATA AND ALTERNATE EXTENDE
- [SDR SWAA2025032007746](https://openairdocs.org/sdr/SWAA2025032007746.md): Pump · low pressure · Mar 18, 2025 · N7876A · Boeing 7377Q8 · Hydraulic Pump, Auxiliary
  > AFTER FLAPS 5 HYD A SYSTEM LOOW PRESSURE LIGHTS ON BOTH ENG AND ELECTRIC PUMP SHORTLY AFTER LOW PRESSURE LIGHTS ON HYD SYSTEM A CAME ON. SYS A QTY WENT TO 0. WE GOT EXTENDED VECTORS RAN QRH FOR LOSS OF SYSTEM A. RAN NON NORMAL LANDING DATA AND ALTERNATE EXTEND
- [SDR AALA202505290407](https://openairdocs.org/sdr/AALA202505290407.md): Engine · fire · Mar 13, 2025 · N885NN · Boeing 737823 · Engine (Turbine/Turboprop)
  > AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: SHORTLY AFTER TAKEOFF, THE RIGHT EGT WAS OBSERVEDTO ILLUMINATE RED WITH A TEMP OF 930 AND AN ENGINE VIBRATION OF 5.0. AIRCRAFT DIVERTED TO AND SAFELY AT DEN. DURING THE PARKING CHECKLIST THE NUMBER 2 ENG
- [SDR ASAA2025020955820](https://openairdocs.org/sdr/ASAA2025020955820.md): Power Supply · no test · Feb 9, 2025 · N292AK · Boeing 737990ER · Emergency Lighting
  > EMERGENCY LIGHT AT L1 AND L2 FAIL TEST ON T/C 78233001. GROUNDED - YES. REMOVED AND REPLACED POWER SUPPLY W/ BATTERY ASSYS M1673 AND M1675 REF AMM 33-51-06, WDM 33-51-14 PG6, AND WDM 33-51-12 PG9. OPS NORMAL.
- [SDR SWAA2025020491670](https://openairdocs.org/sdr/SWAA2025020491670.md): Angle · cracked · Jan 31, 2025 · N7866A · Boeing 7377Q8 · Turbine Section
  > RIGHT ENGINE; LPT COOLING TUBE SUPPORT ANGLE BRACKET CRACKED 4OCLOCK POSITION <[01]. REMOVED AND REPLACED CRACKED LPT COOLING TUBE SUPPORT ANGLE BRACKET AT 4 O?CLOCK POSITION IAW SIP.

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## The whole list in SQL

Runs in DuckDB 1.2 or later on the release's Parquet files over HTTPS:

```sql
SELECT sdr_id, difficulty_date, n_number, aircraft_make, aircraft_model, part_name, part_condition, jasc_code, discrepancy
FROM 'https://openairdocs.org/data/latest/faa_service_difficulty_report.parquet'
WHERE engine_model_key = 'CFM567B20'
ORDER BY difficulty_date DESC
```

This list as a web page: https://openairdocs.org/engine/cfm-international-cfm56-7b20-series/reports

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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.