# N521SW: 1991 Boeing 737-5H4, registration cancelled 2021-12-04 - Type: Cancelled registration (FAA registry, deregistered aircraft) - Cancelled: December 4, 2021 - Status when cancelled: Registration expired, pending cancellation - Airframe: [Boeing 737-5H4](https://openairdocs.org/model/boeing-737-5h4) (registry code 138449D) - Engine: [CFM International CFM56 series](https://openairdocs.org/engine/cfm-international-cfm56-series) (registry code 13802) - Serial number: 25320 - Year built: 1991 - Type of aircraft: Fixed wing multi engine - Engine type: Turbo-fan - Airworthiness: Standard, transport - Airworthiness date: October 4, 1991 - Certificate issued: October 28, 1991 - Last registry action: August 7, 2018 - Mode S code: A68E4A - Owner when cancelled: [Southwest Airlines Co](https://openairdocs.org/faa-owner/SOUTHWEST%20AIRLINES%20CO) - Location: [Dallas, TX](https://openairdocs.org/faa-place/TX/Dallas) - Owner type: Corporation - Owner's area on the map: 32.8326° N, 96.8491° W: Placed by OpenAirDocs at the center of ZIP code 75235, within about a mile (OpenAirDocs). The owner's mailing address, not where the aircraft was based - The mark today: https://openairdocs.org/aircraft/N521SW - FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=521SW - Page: https://openairdocs.org/deregistered/N521SW-2021-12-04 From the FAA registry file of October 29, 2026, cancelled registrations. Owners' street addresses are left out. The Mode S code belongs to the N-number, not the airframe. ADs and bulletins for the Boeing 737-5H4: https://openairdocs.org/model/boeing-737-5h4.md ## Service difficulty reports (410, newest 50) Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model. - [SDR SWAA2016041851058](https://openairdocs.org/sdr/SWAA2016041851058), Apr 16, 2016: LIGHT. INOPERATIVE. LEFT WING EMER EXIT SIDE WALL LIGHT INOPERATIVE. R & R LAMP IAW AMM. - [SDR SWAA2015112346281](https://openairdocs.org/sdr/SWAA2015112346281), Nov 7, 2015: SKIN. CRACKED. SKIN CRACKED, BETWEEN BS 346 - 347.5, STRINGER 2L. REPAIRED SKIN IAW SRM. - [SDR SWAA2015112346280](https://openairdocs.org/sdr/SWAA2015112346280), Nov 7, 2015: SKIN. CRACKED. SKIN CRACKED, BETWEEN BS 341.25 - 341.75, STRINGER 2L. REPAIRED SKIN IAW SRM. - [SDR SWAA2015112346279](https://openairdocs.org/sdr/SWAA2015112346279), Nov 7, 2015: SKIN. CRACKED. SKIN CRACKED, BETWEEN BS 441.25 - 445.25, STRINGER 1L. REPAIRED SKIN IAW EA. - [SDR SWAA2015112346278](https://openairdocs.org/sdr/SWAA2015112346278), Nov 7, 2015: SKIN. CRACKED. SKIN CRACKED, BETWEEN BS 431.5 - 435.25, STRINGER 1L. REPAIRED SKIN IAW EA. - [SDR SWAA2015111946230](https://openairdocs.org/sdr/SWAA2015111946230), Nov 7, 2015: SKIN. CRACKED. SKIN CRACKED BETWEEN BS 423 - 424, STRINGER 1L. REPAIRED SKIN IAW EA. - [SDR SWAA2015111946229](https://openairdocs.org/sdr/SWAA2015111946229), Nov 7, 2015: SKIN. CRACKED. SKIN CRACKED AT BS 360, STRINGER. REPAIRED SKIN IAW ER & EA. - [SDR SWAA2015112346277](https://openairdocs.org/sdr/SWAA2015112346277), Nov 6, 2015: SKIN. CRACKED. SKIN CRACKED, BETWEEN BS 852 - 854, STRINGER 23L. REPAIRED SKIN IAW SRM & EA. - [SDR SWAA2015111846168](https://openairdocs.org/sdr/SWAA2015111846168), Nov 6, 2015: SKIN. CRACKED. SKIN CRACKED BETWEEN BS 892 - 894.25, STRINGER 25L. REPAIRED SKIN IAW SRM & EA. - [SDR SWAA2015102345290](https://openairdocs.org/sdr/SWAA2015102345290), Oct 21, 2015: SKATE ANGLE. CRACKED. LEFT VERTICAL STABILIZER LOWER ACCESS PANEL 9505 & 9507 NUTPLATE BRACKET SKATE ANGLE CRACKED. R & R SKATE ANGLE IAW SRM. - [SDR SWAA2015081742870](https://openairdocs.org/sdr/SWAA2015081742870), Aug 14, 2015: BATTERY. FAULTY. R2 DOOR EMER LIGHTS FAULTY. R & R BATTERY IAW AMM. - [SDR SWAA2015080542539](https://openairdocs.org/sdr/SWAA2015080542539), Aug 4, 2015: SIGN. LOOSE. RIGHT OVERWING EXIT SIGN LOOSE. SECURED SIGN IAW SIP. - [SDR SWAA2015070941677](https://openairdocs.org/sdr/SWAA2015070941677), Jul 6, 2015: LENS. LOOSE. LEFT OVERWING EMER EXIT LIGHT LENS COVER LOOSE. INSTALLED LENS IAW AMM. - [SDR SWAA2015060940486](https://openairdocs.org/sdr/SWAA2015060940486), Jun 8, 2015: LIGHT. INOPERATIVE. LEFT OVERWING EXIT LIGHT INOPERATIVE. RELAMPED IAW MM. - [SDR SWAA2015052039874](https://openairdocs.org/sdr/SWAA2015052039874), May 18, 2015: BALLAST. FAULTY. AFT FLIGHT ATTENDANT SMELLED STRONG ELEC OR OIL SMELL FROM AFT GALLEY AREA. R & R AFT GALLEY CEILING LIGHT BALLAST IAW AMM. - [SDR SWAA2015051139549](https://openairdocs.org/sdr/SWAA2015051139549), Apr 29, 2015: FLAP. DELAMINATED. LEFT WING OTBD AFT FLAP LOWER INBD CORNER DELAMINATED. R & R AFT FLAP IAW AMM. - [SDR SWAA2015050539305](https://openairdocs.org/sdr/SWAA2015050539305), Apr 24, 2015: LENS. LOOSE. LEFT SIDEWALL PANEL EMER LIGHT LENS ASSEMBLY LOOSE. SECURED LENS ASSEMBLY IAW AMM. - [SDR SWAA2015051839797](https://openairdocs.org/sdr/SWAA2015051839797), Apr 9, 2015: FITTING. CRACKED. FORWARD ENTRY DOOR FRAME CLIP CRACKED AT BS 303.9, STRINGER 7L. R & R CLIP IAW SRM & EA. - [SDR SWAA2015050639347](https://openairdocs.org/sdr/SWAA2015050639347), Apr 8, 2015: TIE CLIP. CRACKED. STRINGER TIE CLIP CRACKED AT BS 727A, STRINGER 3R. R & R TIE CLIP IAW DWG & SRM. - [SDR SWAA2015043039180](https://openairdocs.org/sdr/SWAA2015043039180), Apr 8, 2015: TIE CLIP. CRACKED. STRINGER TIE CLIP CRACKED AT BS 639, STRINGER 2R. R & R TIE CLIP IAW SRM. - [SDR SWAA2015042939118](https://openairdocs.org/sdr/SWAA2015042939118), Apr 8, 2015: TIE CLIP. CRACKED. STRINGER TIE CLIP CRACKED AT BS 727C, STRINGER 2R. R & R TIE CLIP IAW SRM & DWG. - [SDR SWAA2015042939117](https://openairdocs.org/sdr/SWAA2015042939117), Apr 8, 2015: TIE CLIP. CRACKED. STRINGER TIE CLIP CRACKED AT BS 482A, STRINGER 9R. R & R TIE CLIP IAW SRM & DWG. - [SDR SWAA2015042939116](https://openairdocs.org/sdr/SWAA2015042939116), Apr 8, 2015: TIE CLIP. CRACKED. STRINGER TIE CLIP CRACKED AT BS 482A, STRINGER 3R. R & R TIE CLIP IAW SRM & DWG. - [SDR SWAA2015042939115](https://openairdocs.org/sdr/SWAA2015042939115), Apr 8, 2015: TIE CLIP. CRACKED. STRINGER TIE CLIP CRACKED AT BS 482A, STRINGER 2R. R & R TIE CLIP IAW SRM & DWG. - [SDR SWAA2015043039198](https://openairdocs.org/sdr/SWAA2015043039198), Apr 7, 2015: CHANNEL. CRACKED. VERTICAL FLANGE OVAL CUT OUT CHANNEL CRACKED AT BS 663.75+2, LBL 24.8. REPAIRED CHANNEL IAW EA. - [SDR SWAA2015050639346](https://openairdocs.org/sdr/SWAA2015050639346), Apr 6, 2015: FRAME. CRACKED. RIGHT FRAME INBD CHORD LOWER END CRACKED AT BS 639. REPAIRED CHORD IAW EA. - [SDR SWAA2015042939114](https://openairdocs.org/sdr/SWAA2015042939114), Apr 6, 2015: STRAP. CRACKED. RIGHT FLOOR STRAP CRACKED AT BS 540, BETWEEN RBL 0 - 25. R & R STRAP IAW DWG & SRM. - [SDR SWAA2015042939113](https://openairdocs.org/sdr/SWAA2015042939113), Apr 6, 2015: STRAP. CRACKED. LEFT FLOOR STRAP CRACKED AT BS 540, BETWEEN LBL 0 - 25. R & R STRAP IAW DWG & SRM. - [SDR SWAA2015042939112](https://openairdocs.org/sdr/SWAA2015042939112), Apr 5, 2015: SUPPORT CHANNEL. CRACKED. FLOORBOARD SUPPORT CHANNEL CRACKED AT BS 767, RBL 3.0, ON LOWER LIP AT FLOORBOARD SPLICE. R & R SUPPORT IAW SRM. - [SDR SWAA2015050139209](https://openairdocs.org/sdr/SWAA2015050139209), Apr 4, 2015: STRUCTURE. CRACKED. L2 DOOR CUT OUT CRACKED. REPAIRED CUT OUT IAW AMM. - [SDR SWAA2015051239587](https://openairdocs.org/sdr/SWAA2015051239587), Apr 2, 2015: BRACKET. CRACKED. R2 DOOR LOWER DOOR FRAME AFT SWEEP PANEL BRACKET CLIP CRACKED. R & R BRACKET IAW SRM. - [SDR SWAA2015012836145](https://openairdocs.org/sdr/SWAA2015012836145), Jan 6, 2015: FRAME. CRACKED. FRAME OTBD CHORD FWD FLANGE CRACKED AT BS 727, STRINGER 18AL, FWD UPPER & 2 LOWER HOLES. REPAIRED CHORD IAW EA. - [SDR SWAA2015012636091](https://openairdocs.org/sdr/SWAA2015012636091), Jan 6, 2015: FRAME. CRACKED. FRAME OTBD CHORD FWD FLANGE CRACKED AT BS 727, STRINGER 18A RT. REPAIRED CHORD IAW EA. - [SDR SWAA2014121034896](https://openairdocs.org/sdr/SWAA2014121034896), Dec 1, 2014: SKIN. CRACKED. FUSELAGE SKIN CRACKED AT BS 520 - 3, STRINGER 16L. REPAIRED SKIN IAW EA. - [SDR SWAA2014120934851](https://openairdocs.org/sdr/SWAA2014120934851), Dec 1, 2014: SKIN. CRACKED. SKIN CRACKED AT BS 380+15, STRINGER 16R. REPAIRED SKIN IAW EA. - [SDR SWAA2014121034895](https://openairdocs.org/sdr/SWAA2014121034895), Nov 30, 2014: SKIN. CRACKED. FUSELAGE SKIN CRACKED AT BS 908-2, STRINGER 4R. REPAIRED SKIN IAW EA. - [SDR SWAA2014120934850](https://openairdocs.org/sdr/SWAA2014120934850), Nov 30, 2014: SKIN. CRACKED. FUSELAGE SKIN CRACKED AT BS 908-2, BETWEEN STRINGER 3L TO 4L. REPAIRED SKIN IAW EA. - [SDR SWAA2014120834755](https://openairdocs.org/sdr/SWAA2014120834755), Nov 30, 2014: SKIN. CRACKED. FUSELAGE SKIN CRACKED AT BS 360+2, BETWEEN STRINGER 1 TO 2L. REPAIRED SKIN IAW SRM. - [SDR SWAA2014092932355](https://openairdocs.org/sdr/SWAA2014092932355), Sep 24, 2014: BATTERY PACK. DISCHARGED. AFT GALLEY EMER LIGHTS INOPERATIVE. R & R BATTERY PACK IAW AMM. - [SDR SWAA2014092632329](https://openairdocs.org/sdr/SWAA2014092632329), Sep 24, 2014: GASPER FAN. FROZEN. STRONG SULFUR SMELL IN CABIN ON CLIMB OUT. FOUND GASPER FAN TO BE FROZEN. R & R GASPER FAN IAW MM. - [SDR SWAA2014090431598](https://openairdocs.org/sdr/SWAA2014090431598), Sep 3, 2014: BATTERY PACK. DISCHARGED. RIGHT AFT GALLEY EMER LIGHT INOPERATIVE. R & R BATTERY PACK IAW AMM. - [SDR SWAA2014071530023](https://openairdocs.org/sdr/SWAA2014071530023), May 16, 2014: STRIP. CRACKED. NUMBER 2 PYLON ACCESS PANEL 58720 CRACKED NUTPLATE STRIP OTBD SIDED. REPAIRED STRIP IAW EA. - [SDR SWAA2014051928114](https://openairdocs.org/sdr/SWAA2014051928114), May 16, 2014: SLIDE. OUT OF POSITION. R2 DOOR EMERGENCY EVAC SLIDE OUT OF POSITION. REPOSITIONED SLIDE IAW MT. - [SDR SWAA2014051928115](https://openairdocs.org/sdr/SWAA2014051928115), May 16, 2014: MOUNT. DAMAGED. R2 DOOR EMERGENCY EVAC SLIDE FWD SLIDE MOUNT DAMAGED. R & R MOUNT IAW SRM. - [SDR SWAA2014051428007](https://openairdocs.org/sdr/SWAA2014051428007), Apr 29, 2014: SKIN. CRACKED. FUSELAGE SKIN CRACKED BETWEEN BS 824+7.25 TO BS 827+7.575, STRINGER 23L. REPAIRED SKIN IAW EA. - [SDR SWAA2014051428006](https://openairdocs.org/sdr/SWAA2014051428006), Apr 29, 2014: SPOILER. DELAMINATED. RIGHT WING NR 6 SPOILER DELAMINATED. R & R NR 6 SPOILER IAW AMM. - [SDR SWAA2014051327907](https://openairdocs.org/sdr/SWAA2014051327907), Apr 29, 2014: SKIN. CRACKED. FUSELAGE SKIN CRACKED AT STATION 827 TO STATION 834, STRINGER 23L. REPAIRED SKIN IAW EA. - [SDR SWAA2014050727743](https://openairdocs.org/sdr/SWAA2014050727743), Apr 29, 2014: SKIN. CRACKED. SKIN CRACKED AT BS 332, STRINGER 4L. REPAIRED SKIN IAW SRM. - [SDR SWAA2014011324056](https://openairdocs.org/sdr/SWAA2014011324056), Jan 10, 2014: SKIN. CRACKED. FUSELAGE SKIN CRACKED AT BS 482 STRINGER 19R. REPAIRED SKIN IAW SWA EA. - [SDR SWAA2014011324055](https://openairdocs.org/sdr/SWAA2014011324055), Jan 9, 2014: SKIN. CRACKED. FUSELAGE SKIN CRACKED AT BS 465 STRINGER 21R. REPAIRED SKIN IAW EA. All 410: https://openairdocs.org/deregistered/N521SW-2021-12-04/reports.md ## FAA accident and incident reports (2) From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. - [Incident 19970113004779I](https://openairdocs.org/incident/19970113004779I), Jan 13, 1997: Boeing 737500* (N521SW), Amarillo, TX. Aircraft departed ramp pavement and became stuck. Deplaned passengers on airstrairs door. - [Incident 19911121056859I](https://openairdocs.org/incident/19911121056859I), Nov 21, 1991: Boeing 7375H4 (N521SW), Los Angeles, CA. Encountered a bomb threat while taxiing for takeoff. Emergency evactuation. No bomb found. --- 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.