# N851SY: 2013 Boeing 737-8K5

- Status: Valid registration
- Airframe: [Boeing 737-8K5](https://openairdocs.org/model/boeing-737-8k5) (registry code 13844CY, 149 seats)
- Engine: [CFM International CFM56-7B26E series](https://openairdocs.org/engine/cfm-international-cfm56-7b26e-series) (registry code 13099)
- Serial number: 37256
- Year built: 2013
- Type: Fixed wing multi engine
- Engine type: Turbo-fan
- Airworthiness: Standard, transport
- Airworthiness date: October 4, 2023
- Certificate issued: June 20, 2023
- Expires: June 30, 2030
- Mode S code: ABACB6
- Registered owner: [Sun Country Inc](https://openairdocs.org/faa-owner/SUN%20COUNTRY%20INC)
- Location: [Minneapolis, MN](https://openairdocs.org/faa-place/MN/Minneapolis)
- Owner type: Corporation
- Owner's area on the map: 44.8723° N, 93.2328° W: Placed by OpenAirDocs at the center of ZIP code 55450, within about a mile (OpenAirDocs). The owner's mailing address, not where the aircraft is based
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=851SY
- Page: https://openairdocs.org/aircraft/N851SY

From the FAA registry file of October 24, 2026. ADs below are matched by the registry's airframe and engine model codes. They may apply; each AD's applicability can narrow it by serial number, part number or installed equipment. This is not a compliance determination. The registry lists only the engine series, so ADs for every CFM International CFM56-7B26E model are included.

## ADs that may apply (OpenAirDocs): 6 in force

### Matched by airframe (Boeing 737-8K5)

None in force.

### Matched by engine (CFM International CFM56-7B26E series)

- [AD 2023-05-05](https://openairdocs.org/ad/2023-05-05): Turbine Engine Compressor Section · CFM International CFM56-5B1, CFM56-5B1/2P, CFM56-5B1/3 and 98 more. Effective May 10, 2023
- [AD 2018-26-01](https://openairdocs.org/ad/2018-26-01): Turbine Engine Compressor Section · CFM International CFM56-7B20, CFM56-7B20/2, CFM56-7B20/3 and 46 more. Effective Jan 10, 2019
- [AD 2018-09-51](https://openairdocs.org/ad/2018-09-51): Engine · CFM International CFM56-7B20, CFM56-7B20/2, CFM56-7B20/3 and 46 more. Effective Jun 7, 2018
- [AD 2015-18-04](https://openairdocs.org/ad/2015-18-04): 73-tooth gearshaft located in the engine accessory gearbox (AGB) · CFM International CFM56-3, CFM56-7B20, CFM56-7B20/2 and 47 more. Effective Oct 20, 2015
- [AD 2015-04-02](https://openairdocs.org/ad/2015-04-02): Dual engine thrust instability event · CFM International CFM56-7B20, CFM56-7B20/2, CFM56-7B20/3 and 46 more. Effective Mar 31, 2015
- [AD 2009-11-02](https://openairdocs.org/ad/2009-11-02): HPC 4-9 spools · CFM International CFM56-2, CFM56-2A, CFM56-2B and 109 more. Effective Jun 23, 2009

### Historical (superseded or no longer in force)

- [AD 2021-10-09](https://openairdocs.org/ad/2021-10-09) (historical): Turbine Engine Compressor Section · CFM International CFM56-5B1, CFM56-5B1/2P, CFM56-5B1/3 and 82 more. Effective Jun 24, 2021
- [AD 2018-18-01](https://openairdocs.org/ad/2018-18-01) (historical): Turbine Engine Compressor Section · CFM International CFM56-7B20, CFM56-7B20/2, CFM56-7B20/3 and 46 more. Effective Oct 16, 2018
- [AD 2018-10-11](https://openairdocs.org/ad/2018-10-11) (historical): Turbine Engine Compressor Section · CFM International CFM56-7B20, CFM56-7B20/2, CFM56-7B20/3 and 46 more. Effective Jun 1, 2018
- [AD 2018-09-10](https://openairdocs.org/ad/2018-09-10) (historical): Turbine Engine Compressor Section · CFM International CFM56-7B20, CFM56-7B20/2, CFM56-7B20/3 and 46 more. Effective May 14, 2018
- [AD 2013-26-01](https://openairdocs.org/ad/2013-26-01) (historical): Oil dynamic seal assembly · CFM International CFM56-3, CFM56-3B, CFM56-3C and 52 more. Effective Feb 3, 2014

## Information bulletins (advisory) (1 in force)

- [SAIB NE-08-17R3](https://openairdocs.org/saib/NE-08-17R3): Turbine Section - Propulsion Technology LLC Unapproved Repair. Issued May 28, 2014
- [SAIB NE-08-17R2](https://openairdocs.org/saib/NE-08-17R2) (historical): Turbine Section - Propulsion Technology LLC Unapproved Repair. Issued Mar 7, 2011

## NTSB investigations

None matched to N851SY.

## FAA accident and incident reports

None matched to N851SY.

## Service difficulty reports (24)

As reported by operators and repair stations. Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model.

- [SDR SCNA20260928412](https://openairdocs.org/sdr/SCNA20260928412), Sep 27, 2026: BRAKE. NO DISCREPANCY. AIRCRAFT PULLS HARD LEFT WHEN BRAKING. PERFORMED TROUBLESHOOTING IAW FIM 32-42 TASK 816. NO DEFECTS OBSERVED. DETERMINED TO BE INTERMITTENT FAULT PER FIM.
- [SDR SCNA20260806340](https://openairdocs.org/sdr/SCNA20260806340), Aug 5, 2026: SLIDE. DISLODGED. 1L YELLOW PART OF THE SLIDE IS COMING OUT OF ITS HOUSING. OPEN
- [SDR SCNA20260717310](https://openairdocs.org/sdr/SCNA20260717310), Jul 17, 2026: BRACKET. OUT OF ADJUST. 1L DOOR GIRT BAR STICKS IN BRACKETS, HARD TO REMOVE. ADJUSTED GIRT BAR BRACKET. EASILY REMOVEABLE. OK FOR SERVICE. REF MM 25-66-01
- [SDR SCNA20260713290S](https://openairdocs.org/sdr/SCNA20260713290S), Jul 11, 2026: FASTENER. DAMAGED. REMOVED TEMP FASTNER AND REPLACED WITH RIVET REF SRM 51-40-02. OK FOR SERVICE . THIS CLEARS GMM/MTI
- [SDR SCNA20260706282](https://openairdocs.org/sdr/SCNA20260706282), Jul 5, 2026: CRADLE. OUT OF ADJUST. L1 GIRT BAR CRADLE LOOSE. ADJUSTED L1 GIRT BAR CRADLE IAW AMM 25-66-01. NO DEFECT NOTED AT THIS TIME.
- [SDR SCNA20260706281](https://openairdocs.org/sdr/SCNA20260706281), Jul 2, 2026: HOOK. LOOSE. L1 GIRT BAR J-HOOK IS LOOSE. ADJUSTED L1 DOOR J-HOOK REF AMM 25-66-01. OPS CHECK GOOD ACFT OK FOR SERVICE.
- [SDR SCNA20260702280](https://openairdocs.org/sdr/SCNA20260702280), Jul 2, 2026: HOOK. LOOSE. L1 GIRT BAR J-HOOK IS LOOSE. ADJUSTED L1 DOOR J-HOOK REF AMM 25-66-01. OPS CHECK GOOD. ACFT OK FOR SERVICE.
- [SDR SCNA20260504184](https://openairdocs.org/sdr/SCNA20260504184), May 3, 2026: BATTERY PACK. INOPERATIVE. FWD CABIN LT SIDE EMERGENCY LIGHTS INOP. R & R LT FWD CABIN EMERGENCY LIGHT CHARGER ASSY IAW AMM 33-51-06-960-806 AND REPLACED BATTERY PACK IAW AMM 33-51-06-960
- [SDR SCNA20260504183](https://openairdocs.org/sdr/SCNA20260504183), May 3, 2026: BATTERY PACK. INOPERATIVE. FWD R/H SECTION OF EMERGENCY LIGHTS WILL NOT STAY ILLUMINATED LONGER THAN 30 SECONDS. R & R BATTERY PACK IAW AMM 33-51-06-960-805, OPS CHECK GOOD AT THIS TIME.
- [SDR SCN2026F00000](https://openairdocs.org/sdr/SCN2026F00000), Feb 11, 2026: UNKNOWN. ODOR. AFT FA'S REPORTED FAINT ODOR AKIN TO ELECTRICAL BURNING DURING DESCENT AND APPROACH IN THE VICINITY OF THE AFT LAVATORY.
- [SDR SCNA20260213078](https://openairdocs.org/sdr/SCNA20260213078), Feb 11, 2026: SIGN. DETACHED. SIGN OUTSIDE AFT LEFT LAV LOOSE WITH ELECTRICAL WIRING SHOWING. WORK ACCOMPLISHED: R & R LIGHT REF AMM 33-51-14 OPS TEST GOOD OK FOR SERIVCE
- [SDR SCNA20251230511S](https://openairdocs.org/sdr/SCNA20251230511S), Dec 29, 2025: SKID. NONE. POSSIBLE TAIL STRIKE. PERFORMED TAIL STRIKE INSPECTION PER AMM 05-51-32 FOUND TAIL SKID AND SHOW TO STILL IN SERVICEABLE CONDITION
- [SDR SCNA20251230511](https://openairdocs.org/sdr/SCNA20251230511), Dec 29, 2025: SKID. NO DISCREPANCY. POSSIBLE TAIL STRIKE. PERFORMED TAIL STRIKE INSPECTION PER AMM 05-51-32 FOUND TAIL SKID AND SHOW TO STILL IN SERVICEABLE CONDITION
- [SDR SCNA20250623224](https://openairdocs.org/sdr/SCNA20250623224), Jun 21, 2025: FLAP SYSTEM. FAULTED. FLAPS DID NOT DEPLOY POST 10 . RAN QRH 9.34 USED ALTERATE FLAP SWITCH TO LAND WITH FLAPS 15 (DECLARED EMERGECNY) ACCOMPLISHED FSEU BITE IAW FIM 27-51 TASK 801 W
- [SDR SCNA20250425125](https://openairdocs.org/sdr/SCNA20250425125), Apr 23, 2025: POWER SUPPLY. INOPERATIVE. LEFT OVER WING EMERGENCY EXIT LIGHT INOP. REF TO TECHOPS MX N/R 00175 - RESOLUTION: REPLACED L/H EMERGENCY EXIT LIGHT POWER SUPPLY IAW B737-800 AMM 35-51-06 OPS
- [SDR SCNA20250425128](https://openairdocs.org/sdr/SCNA20250425128), Apr 22, 2025: LIGHT. NO TEST. AWR CUSTOMER REQUEST: EMERGENCY LIGHT AT LEFT OVER WING DON'T TURN ON DURING TEST - RESOLUTION - (IN PROGRESS)
- [SDR SCNA20250425126](https://openairdocs.org/sdr/SCNA20250425126), Apr 22, 2025: POWER SUPPLY. INOPERATIVE. EMP 10001944 AWR CUSTOMER REQUEST: EMERGENCY LIGHT AT LEFT OVER WING DON'T TURN ON DURING TEST - RESOLUTION: - EMERGENCY POWER SUPPLY OF EMERGENCY LIGHT AT LEFT
- [SDR SCNA20250402090](https://openairdocs.org/sdr/SCNA20250402090), Apr 2, 2025: BRACKET. DAMAGED. WORK ORDER 80736, NR00087: INITIAL INSPECTION: ELONGATED HOLES ON BRACKETS (2EAS) AT FWD LH ESCAPE SLIDE COVER. BRACKETS REPLACED PER B737-800 SRM 51-40-02-0G-0
- [SDR SCNA20241028345](https://openairdocs.org/sdr/SCNA20241028345), Oct 27, 2024: BOTTLE. LOW PRESSURE. DEFECT 757451: L1 DOOR SLIDE GAUGE IN THE RED. RESOLUTION: R&R L1 DOOR SLIDE REF AMM 25-66-01.
- [SDR SCNA20241008327](https://openairdocs.org/sdr/SCNA20241008327), Oct 7, 2024: ACTUATOR. FAULTED. LANDED WITH FUEL IMBALANCE OF 2000 LBS NO EXCESSIVE IMPUTS DURING LANDING. NO CROSSWIND, SMOOTH LANDING COMPLETED. MC NOTIFED - RESOLUTION: BALANCED WING FUEL T
- [SDR SCNA20240912314](https://openairdocs.org/sdr/SCNA20240912314), Sep 11, 2024: POWER SUPPLY. INOPERATIVE. TWO EXTERIOR EMERGENCY LIGHTS ON LEFT EXTERIOR ARE INOPERATIVE. ONE IN THE VICINITY OF THE OVERWING EXITS, THE OTHER AT THE TRAILING EDGE WING ROOT. TWO INTERIO
- [SDR SCNA2024081301](https://openairdocs.org/sdr/SCNA2024081301), Aug 12, 2024: FLAP SYSTEM. FAULTED. ON APPROACH FLAPS STAYED AT 1ODEGREES WHEN GREATER FLAP DEGREES WERE SELECTED (EMERGENCY DECLARED) . PERFORMED FIM 27-51 TASK 899 , TASK 801, AND TASK 836, FOUN
- [SDR SCNA20240122017](https://openairdocs.org/sdr/SCNA20240122017), Jan 22, 2024: UNKNOWN. ODOR. DEFECT 731833 ITEM 1,- - HEAVY SMOKE SMELL IN COCKPIT AND CABIN PULLING INTO GATE. - - RESOLUTION: C/W FIM TASK 21-00-806 PARAGRAPH C. NO FUMES NOTED. UNABLE TO
- [SDR SCNA20240118016](https://openairdocs.org/sdr/SCNA20240118016), Jan 16, 2024: UNKNOWN. ODOR. DEFECT 731833: - - HEAVY SMOKE SMELL IN COCKPIT AND CABIN PULLING INTO GATE - - RESOLUTION: C/W FIM TASK 21-00-806 PARAGRAPH C. NO FUMES NOTED. UNABLE TO DUPLIC

## STCs that may be installed (OpenAirDocs) (1)

Approved for this aircraft's airframe or engine model, in force first, then newest. The registry doesn't record which STCs an aircraft has; its records do.

### Approved for the engine (CFM International CFM56-7B26E series)

- [STC SE04840NY](https://openairdocs.org/stc/SE04840NY): Installation of HarcoSemco Exhaust Gas Temperature (EGT) Electrical Harnesses in CFM56-7 engine. Kilroy Aviation LLC

## Earlier aircraft with N851SY

The FAA can reassign an N-number once a registration is cancelled. These aircraft carried N851SY before.

- [Cancelled 1990-03-13](https://openairdocs.org/deregistered/N851SY-1990-03-13): Boeing 727-230, S/N 20792. Exported to Turkey. Owner: [Wilmington Trust Co Trustee](https://openairdocs.org/faa-owner/WILMINGTON%20TRUST%20CO%20TRUSTEE), [Wilmington, DE](https://openairdocs.org/faa-place/DE/Wilmington)

## Related

- Other Boeing 737-8K5 aircraft: https://openairdocs.org/model/boeing-737-8k5/aircraft.md
- The CFM International CFM56-7B26E series engine: https://openairdocs.org/engine/cfm-international-cfm56-7b26e-series.md

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