# Service difficulty reports: N421UP A list on [N421UP](https://openairdocs.org/aircraft/N421UP.md). Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model. Newest first. Page 1 of 7 · 311 reports - [SDR IPXA2026043058730](https://openairdocs.org/sdr/IPXA2026043058730.md): Intercostal · corroded · Apr 30, 2026 · N421UP · Boeing 75724APF · Fuselage Miscellaneous Structure > FS 1042, LBL 45, PAX AREA OTBD INTERCOSTAL HAS CORROSION ON UPPER OTBD LIP UNDER NUTPLATE. INSTALLED INTERCOSTAL P/N 149N7559-2 SERIAL NUMBER: TAG058576. AT STA 1042 TO STA 1060 LBL 45 PER SRM 51-40-02-0G - [SDR IPXA2026043058603](https://openairdocs.org/sdr/IPXA2026043058603.md): Bracket · cracked · Apr 30, 2026 · N421UP · Boeing 75724APF · Fuselage Main, Structure > FS 1065, RBL 58 RT MLG FWD SEAL RETAINER FRAME BRACKET CRACKED. INSTALLED BRACKET AT BS 1065, RBL 58 RH MLG FWD SEAL RETAINER IAW SRM 51-40-02. - [SDR IPXA2026042679174](https://openairdocs.org/sdr/IPXA2026042679174.md): Bracket · cracked · Apr 25, 2026 · N421UP · Boeing 75724APF · Nacelle/Pylon Miscellaneous Structure > DURING OK TO INSTALL OF ACCESS PANEL 445AR FOUND IN FWD FRAME LOWER BRACKET WITH CRACK. REMOVED CLIP (BRACKET) AT LOWER FWD FRAME IN ACCESS PNL 445AR IAW SRM-51-40-02. INSTALLED CLIP (BRACKET) AT FWD FRAME IN PNL 445AR IAW 757-200PF-SRM-51-40-02. - [SDR IPXA2026042090836](https://openairdocs.org/sdr/IPXA2026042090836.md): Skin · cracked · Apr 20, 2026 · N421UP · Boeing 75724APF · Wing, Plate/Skin > RIGHT WING, BETWEEN SLAT NR 8 & 9, FIXED LEADING EDGE SKIN CRACKED. COMPLIED WITH EO-97223-REQ1 & EA 757-5741-27-A4443, REV-. - [SDR IPXA2026050149922](https://openairdocs.org/sdr/IPXA2026050149922.md): Tee Angle · corroded · Apr 17, 2026 · N421UP · Boeing 75724APF · Cargo/Baggage Doors > FWD CARGO DOOR OUTER TEE IS CORRODED. INSTALLED NEW OUTER TEE IAW SRM 51-40-02-0G-0. - [SDR IPXA2026041735306](https://openairdocs.org/sdr/IPXA2026041735306.md): Support Angle · corroded · Apr 16, 2026 · N421UP · Boeing 75724APF · Aerodynamic Fairings > RIGHT WING TO BODY AREA HAS A CORRODED SUPPORT ANGLE AT BS 1060, RBL 69. INSTALLED A NEW SUPPORT ANGLE IAW SRM 51-40-02-OG. - [SDR IPXA2026050501913](https://openairdocs.org/sdr/IPXA2026050501913.md): Floor Panel · damaged · Apr 14, 2026 · N421UP · Boeing 75724APF · Fuselage Floor Panel > MAJOR REPAIR. MAIN CARGO DECK RH FLOOR BOARD #232XCF STA#480 CORNER DAMAGED. NEW FLOOR PANEL XCF WAS FABRICATED IAW SREO-9692-REQ0001 STEPS 1-6 - [SDR IPXA2026042901438](https://openairdocs.org/sdr/IPXA2026042901438.md): Floor Panel · damaged · Apr 14, 2026 · N421UP · Boeing 75724APF · Fuselage Floor Panel > MAJOR REPAIR, MAIN CARGO COMPT. STA.879 LEFT FLOOR PANEL 231XTF DAMAGED ON END. FLOOR PANEL 231XTF FABRICATION IS COMPLETE IAW EO NO:B757-5320-9692-K / SREO-16407-REQ001 - [SDR IPXA2026042901327](https://openairdocs.org/sdr/IPXA2026042901327.md): Floor Panel · damaged · Apr 14, 2026 · N421UP · Boeing 75724APF · Fuselage Floor Panel > MAJOR REPAIR, MAIN CARGO COMPT BS 900 LEFT FLOOR PANEL 231XYF HAS RIPPED OUT SCREW RETAINER HOLE FLOOR PANEL 231XYF FABRICATION IS COMPLETE IAW EO NO:B757-5320-9692-K / SREO-16407-REQ001 - [SDR IPXA2026050401890](https://openairdocs.org/sdr/IPXA2026050401890.md): Floorboard · damaged · Apr 14, 2026 · N421UP · Boeing 75724APF · Fuselage Floor Panel > MAJOR REPAIR, MAIN CARGO DECK FLOOR BOARD 222XAF STA.440 CORNER DAMAGED, FABRICATED A NEW FLOOR PANEL 222XAF IAW SREO-6962-REQ001 STEPS 1-6 - [SDR IPXA2026042901347](https://openairdocs.org/sdr/IPXA2026042901347.md): Floor Panel · damaged · Apr 14, 2026 · N421UP · Boeing 75724APF · Fuselage Floor Panel > MAIN CARGO COMPT. BS 900 LOWER LEFT FLOOR PANEL 231XWF HAS DAMAGED HONEYCOMB. FLOOR PANEL 231XWF FABRICATION IS COMPLETED IAW EO NO:B757-5320-9692-K / SREO-16407-REQ001. INSERTS INSTALLED IAW SREO-16407-REQ001. I.A.W. UPS GMM (RII) 04.02 STEP 1,2,3,4,AND 5 - [SDR IPXA2026050482714](https://openairdocs.org/sdr/IPXA2026050482714.md): Bracket · damaged · Apr 14, 2026 · N421UP · Boeing 75724APF · Landing Gear Doors > LT MLG STRUT DOOR BOTTOM INNER SKIN HAS COMPOSITE DAMAGE (2 LOCATIONS). INSTALLED LOWER LH MLG STRUT DOOR BRACKET IAW B757 AMM 32-12-04-404-012 - [SDR IPXA2026041896123](https://openairdocs.org/sdr/IPXA2026041896123.md): Floorbeam · corroded · Apr 14, 2026 · N421UP · Boeing 75724APF · Fuselage Main, Floor Beam > MDC FLOOR STRUCTURE BS 1100, BL 0 - RBL 24 FLOORBEAM CORRODED ON THE NUTPLATE. CLEANED AREA IAW SOPM 20-30-03 AND REMOVED CORROSION AT MDC FLOOR STRUCTURE STA 1100 AND BL 0 TO RBL 24 FLOORBEAM IAW SRM 53-00-51-1A-1 FIGURE 101, DETAIL III. IT WAS FOUND TO BE - [SDR IPXA2026041897324](https://openairdocs.org/sdr/IPXA2026041897324.md): Floorbeam · corroded · Apr 14, 2026 · N421UP · Boeing 75724APF · Fuselage Main, Floor Beam > MDC FLOOR STRUCTURE AT STA 1200 AND RBL 24 TO RBL 45 FLOORBEAM WITH CORROSION DOT 07-117. CLEANED AREA IAW SOPM 20-30-03 AND REMOVED CORROSION AT MDC FLOOR STRUCTURE AT STA 1200 AND RBL 24 TO RBL 45 FLOORBEAM IAW SRM 53-00-51-1A-1 FIGURE 101, DETAIL III. IT - [SDR IPXA2026041895658](https://openairdocs.org/sdr/IPXA2026041895658.md): Floorbeam · corroded · Apr 14, 2026 · N421UP · Boeing 75724APF · Fuselage Main, Floor Beam > MDC FLOOR STRUCTURE AT STA 1200 AND LB 0 TO RBL 24 FLOOR BEAM WITH CORROSION. CLEANED AREA IAW SOPM 20-30-03 AND REMOVED CORROSION AT MDC FLOOR STRUCTURE AT BS 1200 AND LB 0 TO RBL 24 FLOOR BEAM IAW SRM 53-00-51-1A-1 FIGURE 101, DETAIL III. IT WAS FOUND TO BE - [SDR IPXA2026042295134](https://openairdocs.org/sdr/IPXA2026042295134.md): Floorbeam · cracked · Apr 14, 2026 · N421UP · Boeing 75724APF · Fuselage Main, Floor Beam > MDC FLOOR STRUCTURE STA 1200 BETWEEN BL 0 TO LBL 24 FLOORBEAM WITH EVIDENCE OF CRACK. REMOVAL OF DAMAGE ON MAIN CARGO DECK FLOOR BEAM UPPER CHORD. ORIGINAL THICKNESS: 0.220" DEPTH OF CLEANUP 0.005", REMAINING THICKNESS: 0.215" FOUND TO BE WITHIN LIMITS IAW S - [SDR IPXA2026041795275](https://openairdocs.org/sdr/IPXA2026041795275.md): Seat Track · corroded · Apr 14, 2026 · N421UP · Boeing 75724APF · Fuselage, Seat/Cargo Attach Fittings > FAULT-STR-Z200-MDC FLOOR STRUCTURE BETWEEN STA 1180 TO 1200 SEAT TRACKS BL 0 AND LBL 24 HOLE OF THE NUTPLATES WITH CORROSION DOT 07-012. REMOVED DAMAGE ON THE SEAT TRACK STRUCTURE PER SRM 51-10-02-0G AND PERFORMED EVALUATION ON THE SEAT TRACK AT BL0 TO LBL24 - [SDR IPXA2026041794389](https://openairdocs.org/sdr/IPXA2026041794389.md): Seat Track · corroded · Apr 14, 2026 · N421UP · Boeing 75724APF · Fuselage, Seat/Cargo Attach Fittings > MDC FLOOR STRUCTURE BETWEEN STA 1200 TO 1180 AND LBL 45 SEAT TRACK WITH CORROSION IN I/B AND O/B SIDE AND HAVE FASTENER LOOSE DOT 07-110. PERFORMED EVALUATION ON THE SEAT TRACK AT LBL 45.5 BTWN STA 1200 AND 1180. FLANGE WAS FOUND TO BE WHITIN ALLOWABLE LIMITS - [SDR IPXA2026041798932](https://openairdocs.org/sdr/IPXA2026041798932.md): Cover Plate · cracked · Apr 14, 2026 · N421UP · Boeing 75724APF · Fuselage Miscellaneous Structure > MDC, BS 1060 BETWEEN LBL 24.75 - LBL 45.50, CHANNEL SUPPORT UPPER SHIM IS CRACKED. INSTALLED COVER PLATE ON BS 1060 AND BETWEEN LBL 24.75 TO LBL 45.50. IAW SRM 51-40-02. - [SDR IPXA2026042875633](https://openairdocs.org/sdr/IPXA2026042875633.md): Floor Panel · broken · Apr 13, 2026 · N421UP · Boeing 75724APF · Fuselage Floor Panel > MAJOR REPAIR. MDC FLOOR PANEL 252XSF BROKEN. FABRICATION OF FLOOR PANEL 252XSF IS ACCOMPLISHED IAW EO: B757-5320-9692-K/SREO-9692-REQ001. REPLACEMENT OF FLOOR INSERTS SREO-9692-REQ001. JOB COMPLETE - [SDR IPXA2026042880111](https://openairdocs.org/sdr/IPXA2026042880111.md): Floor Panel · damaged · Apr 13, 2026 · N421UP · Boeing 75724APF · Fuselage Floor Panel > MAJOR REPAIR. MDC FLOOR PANLE 251XMF BROKEN. FABRICATION OF FLOOR PANEL 251XMF IS ACCOMPLISHED IAW EO: B757-5320-9692-K/SREO-9692-REQ001. REPLACEMENT OF FLOOR INSERTS SREO-9692-REQ001. JOB COMPLETE. - [SDR IPXA2026041353887](https://openairdocs.org/sdr/IPXA2026041353887.md): Strap · corroded · Apr 11, 2026 · N421UP · Boeing 75724APF · Fuselage Miscellaneous Structure > CORRODED EXISTING FILLER REPAIR AT FS 1825 RBL 3R TO 6R EXISTING MIDDLE STRAP REPAIR ON APU AIR INTAKE INLET CUTOUT AFT STRAP. REMOVE THE EXISTING REPAIR OF APU INLET DOOR MIDDLE STRAP P/N: 148N3138-8000 INSTALLED AT STA 1825 BETWEEN S-3R AND S-6R AND ACCOMPLI - [SDR IPXA2026041355642](https://openairdocs.org/sdr/IPXA2026041355642.md): Intercostal · corroded · Apr 11, 2026 · N421UP · Boeing 75724APF · Fuselage Miscellaneous Structure > STR LH WING, WING TO BODY PANEL AREA AT LH W/W STA 1040 TO 1060 T-CHORD IS EXFOLIATED. REMOVED T-CHORD AT WTB L/H W/W 1040 TO 1060 PER SRM 51-40-02-0G. INSTALLED NEW T-CHORD AT LH WING, WING TO BODY PANEL AREA AT LH W/W STA 1040 TO 1060. INSPECTED AND VERIFI - [SDR IPXA2026042355714](https://openairdocs.org/sdr/IPXA2026042355714.md): Angle · cracked · Apr 11, 2026 · N421UP · Boeing 75724APF · Fuselage Miscellaneous Structure > FWD CARGO STA 520 CEILING AREA, STRUCTURAL CLIP IS CRACKED. REMOVED STRUCTURAL CLIP AT FWD CARGO STA 520 CEILING AREA IAW SRM 51-40-02-0G-0. INSTALLED NEW PART IAW B757-200, SRM 51-40-02-0G-0. - [SDR IPXA2026041853943](https://openairdocs.org/sdr/IPXA2026041853943.md): Strap · corroded · Apr 11, 2026 · N421UP · Boeing 75724APF · APU Cowling/Containment > CORRODED FWD STRAP AT APU AIR INTAKE INLET CUTOUT. INSTALLED NEW STRAP FROM FWD STRAP AT APU AIR INTAKE INLET CUTOUT IAW B757-200 SRM 51-40-02-0G IAW UPS GMM RII 04.02.01.15 ATA 51 STEP D. REVIEWED - [SDR IPXA2026041337727](https://openairdocs.org/sdr/IPXA2026041337727.md): Intercostal · corroded · Apr 10, 2026 · N421UP · Boeing 75724APF · Aerodynamic Fairings > RIGHT WING TO BODY INTERCOSTAL AT BS 1040 TO 1060, RBL 46 IS EXFOLIATED AROUND NUTPLATE LOCATIONS. INSTALLED NEW TEE FITTING AND REINSTALLED 1EA ANGLE AND REINSTALLED 1EA BONDING JUMPER IAW SRM 51-40-02-0G-0. - [SDR IPXA2026050237740](https://openairdocs.org/sdr/IPXA2026050237740.md): Tee Angle · corroded · Apr 10, 2026 · N421UP · Boeing 75724APF · Aerodynamic Fairings > RIGHT WING TO BODY TEE ANGLE AT BS 1060, RBL 8.8 - 43 WAS CORRODED UNDER NUTPLATES. INSTALLED A NEW TEE ANGLE IAW SRM 51-40-02. WORK COMPLETE. - [SDR IPXA2026042837717](https://openairdocs.org/sdr/IPXA2026042837717.md): Tee Fitting · corroded · Apr 10, 2026 · N421UP · Boeing 75724APF · Aerodynamic Fairings > RIGHT WING TO BODY T-FITTING AT BS 1060 RBL 65 IS EXFLOIATED AROUND NUTPLATE LOCATIONS REVIEWED. REMOVED THE T FITTING IAW SRM 51-40-02. INSTALLED T FITTING AT RT WING TO BODY IAW 1060, RBL 65 I.A.W. B757-200 SRM 51-40-02. - [SDR IPXA2026042837737](https://openairdocs.org/sdr/IPXA2026042837737.md): Tee Fitting · corroded · Apr 10, 2026 · N421UP · Boeing 75724APF · Aerodynamic Fairings > RIGHT WING TO BODY TEE FITTING AT BS 1045, RBL 46 TO RBL 67 HAS EXFOLIATION CORROSION ON UPPER SURFACE. INSTALLED NEW TEE FITTING IN RT WING AT BS 1045, RBL 46 TO RBL 67 IAW SRM 51-40-02-0G-0. - [SDR IPXA2026041543021](https://openairdocs.org/sdr/IPXA2026041543021.md): Bracket · cracked · Apr 10, 2026 · N421UP · Boeing 75724APF · Wing Miscellaneous Structure > AFTPYLON #1 STRUCTURE THAT ATTACH ACCESS PANEL435AR FWD FRAME LOWER BRACKET HAS A CRACK. INSTALLED BRACKET (SPRING CLIP) AT FWD FRAME LOWER EDGE OF #1 PYLON STRUCTURE BEHIND PNL 435AR IAW 757-200PF-SRM-51-40-02 JC. - [SDR IPXA2026042043065](https://openairdocs.org/sdr/IPXA2026042043065.md): Attach Bracket · cracked · Apr 10, 2026 · N421UP · Boeing 75724APF · Nacelle/Pylon, Main Frame > AFT PYLON #1 STRUCTURE THAT ATTACH ACCESS PANEL 435AR AFT FRAME LOWER BRACKET HAS A CRACK. INSTALLED ANGEL (BRACKET) AT #1 PYLON STRUCTURE IN PNL 435AR AFT LOWER FRAME IAW 757-200PF-SRM-51-40-05. - [SDR IPXA2026042043018](https://openairdocs.org/sdr/IPXA2026042043018.md): Access Panel · cracked · Apr 10, 2026 · N421UP · Boeing 75724APF · Nacelle/Pylon, Plate/Skin > -AFT PYLON #1 STRUCTURE THAT ATTACH ACCESS PANEL 435BR AFT FRAME LOWER BRACKET HAS A CRACK. INSTALLED CLIP (BRACKET) AT #1 PYLON STRUCTURE IN PNL 435BR AFT LOWER FRAME IAW 757-200PF-SRM-51-40-05. - [SDR IPXA2026041025522](https://openairdocs.org/sdr/IPXA2026041025522.md): Strap · corroded · Apr 9, 2026 · N421UP · Boeing 75724APF · APU Cowling/Containment > EMPENAGE THROUGHT ACCESS PANEL 311AL STRUCTURE THAT ATTACH APU INLET DOOR HAVE CORROSION 07-005 INSTALLED APU AIR INTAKE DOOR IAW B757 AMM 49-15-05-404-016. AND INTAKE DOOR HOUSING IAW B757 AMM 49-15-08-404-008. - [SDR IPXA2026050121290](https://openairdocs.org/sdr/IPXA2026050121290.md): Beam · damaged · Apr 9, 2026 · N421UP · Boeing 75724APF · Cargo/Baggage Doors > FWD CARGO DOOR LOWER FRAME BEAM, FWD EDGE BEAM HAS PUNCTURE. INSTALLED NEW FRAME BEAM AND PANEL SUPPORT LIGHT DOOR ON FWD CARGO DOOR IAW SRM 51-40-02-0G-0. - [SDR IPXA2026041323730](https://openairdocs.org/sdr/IPXA2026041323730.md): Tee Angle · corroded · Apr 9, 2026 · N421UP · Boeing 75724APF · Aerodynamic Fairings > RH WING TO BODY T-CHORD AT BS 1040 HAS CORROSION AROUND NUTPLATE HOLES. BLENDED AREA AROUND THE NUTPLATES HOLES TO REMOVE THE CORROSION PER SRM 51-10-02-0G-0 AND AFTER PERFORMED EVALUATION T-CHORD AT STA 1040 WAS FOUND TO BE WHITIN ALLOWABLE LIMITS. PER SRM 5 - [SDR IPXA2026041423711](https://openairdocs.org/sdr/IPXA2026041423711.md): Tee Fitting · corroded · Apr 9, 2026 · N421UP · Boeing 75724APF · Aerodynamic Fairings > LH WING TO BODY TEE - FITTING AT BS 1040 FWD EDGE HAS CORROSION. REMOVED TEE ANGLE ON BS 1037.67 LT WTB SIDE. IAW SRM 51-40-02. INSTALLED TEE ANGEL AT STA 1040 AT THE L/H WING TO BODY. IAW SRM 51-40-02-0G. - [SDR IPXA2026050205159](https://openairdocs.org/sdr/IPXA2026050205159.md): Bracket · chafed · Apr 8, 2026 · N421UP · Boeing 75724APF · Nacelle/Pylon, Main Frame > PANEL 435BL HAS AN ELONGATED HOLE AND SIGNS OF CHAFED. INSTALLED SERVICABLE SEAL AND SEAL RETAINER REMOVED TO FOM IN STEP 11 I.A.W B757-200 SRM 51-40-02-OG - [SDR IPXA2026040904985](https://openairdocs.org/sdr/IPXA2026040904985.md): Frame · dented · Apr 8, 2026 · N421UP · Boeing 75724APF · Fuselage Main, Frame > MAJOR REPAIR, FWD CARGO FRAME AT STA 680 BETWEEN STR-23L AND STR-24L HAS 1(EA) DENTED. COMPLIED WITH UPS EO-97140-REQ1 AND EA 757-5330-27-A4425 REV-. - [SDR IPXA2026040904995](https://openairdocs.org/sdr/IPXA2026040904995.md): Frame · damaged · Apr 8, 2026 · N421UP · Boeing 75724APF · Fuselage Main, Frame > MAJOR REPAIR, FWD CARGO FRAME AT BS 660 BETWEEN STR-23L AND STR-24L HAS 1(EA) DENTED. COMPLIED WITH UPS EO-97141-REQ1 AND EA 757-5330-27-A4426 REV-. - [SDR IPXA2026040904962](https://openairdocs.org/sdr/IPXA2026040904962.md): Frame · damaged · Apr 8, 2026 · N421UP · Boeing 75724APF · Fuselage Main, Frame > MAJOR REPAIR, FWD CARGO FRAME AT BS 720 BETWEEN STR-23R AND STR-24R HAS 1(EA) DENT. COMPLIED WITH UPS EO-97139-REQ1 AND VT-MAE EA 757-5330-27-A4424, REV. -. - [SDR IPXA2026040904883](https://openairdocs.org/sdr/IPXA2026040904883.md): Frame · dented · Apr 8, 2026 · N421UP · Boeing 75724APF · Fuselage Main, Frame > MAJOR REPAIR. FWD CARGO FRAME AT BS 700 BETWEEN S23R AND S24R HAS 2(EA) DENTS. COMPLIED WITH UPS EO-97143-REQ1 AND VT-MAE EA 757-5330-27-A4428, REV. -. - [SDR IPXA2026040904973](https://openairdocs.org/sdr/IPXA2026040904973.md): Frame · damaged · Apr 8, 2026 · N421UP · Boeing 75724APF · Fuselage Main, Frame > FWD CARGO FRAME AT BS 800 BETWEEN STR-22R AND STR-24R HAS 2(EA) DENTS. ACCOMPLISH REPAIR PER EO-97142-REQ1 AND VT-MAE EA 757-5330-27-A4427, REV -. - [SDR IPXA2026042404555](https://openairdocs.org/sdr/IPXA2026042404555.md): Support Bracket · cracked · Apr 8, 2026 · N421UP · Boeing 75724APF · Fuselage Miscellaneous Structure > RIGHT WHEEL WELL AT BS 1060, ONE SEAL RETAINER BRACKET IS CRACKED. REMOVED THE SEAL RETAINER BRACKET BS 1060, RBL 50 IAW SRM 51-40-02-OG. INSTALLED NEW SUPPORT BRACKET IAW SRM 51-40-02-OG. - [SDR IPXA2026042104911](https://openairdocs.org/sdr/IPXA2026042104911.md): Tee Angle · corroded · Apr 8, 2026 · N421UP · Boeing 75724APF · Aerodynamic Fairings > R/H WHEEL WELL FAIRING SUPPORT STRUCTURE TCHORD HAS CORROSION, BTWN STA 1040 AND STA 1060 AT RBL 62. LOCATED AND DRILLED NEW T-CHORD I.A.W. B757-200PF SRM 51-40-05. - [SDR IPXA2026042205165](https://openairdocs.org/sdr/IPXA2026042205165.md): Ball Mat · corroded · Apr 8, 2026 · N421UP · Boeing 75724APF · Fuselage Miscellaneous Structure > MAIN DECK BALL MAT 231BM3 UNDER SIDE SKIN HAS CORROSION AT ALL BALL CUTOUTS. OUT OF SEQUENCE STEP 6 INSPECTED FABRICATIN OF NEW SKIN FOR BALLMAT 231BM3 IAW B757 GMM09-08-01-04 SREO 11648-RQ002. - [SDR IPXA2026042205156](https://openairdocs.org/sdr/IPXA2026042205156.md): Ball Mat · corroded · Apr 8, 2026 · N421UP · Boeing 75724APF · Fuselage Miscellaneous Structure > MAIN DECK BALL MAT 232BM2 UNDER SIDE SKIN HAS CORROSION AT ALL BALL CUTOUTS DOT 07586-05. REMOVED BALL MAT LOWER SKIN I.A.W SREO-11648-REQ002 AND B757-200 SRM 51-40-02-OG. TREATED AND PRIMED EXTERNAL SURFACE OF LOWER SKIN AND INSTALLED NEW LOWER SKIN ON BALL - [SDR IPXA2026041705118](https://openairdocs.org/sdr/IPXA2026041705118.md): Structure · corroded · Apr 8, 2026 · N421UP · Boeing 75724APF · Fuselage Miscellaneous Structure > MAIN DECK BALL MAT 232BM1 UNDER SIDE SKIN HAS CORROSION AT ALL BALL CUTOUTS.. INSTALLED SKIN ON BALL MAT 232BM1 IAW SRM 51-40-02 AND SERO-11648 -REQ002. REVIEWED. - [SDR IPXA2026050883072](https://openairdocs.org/sdr/IPXA2026050883072.md): Skin · cracked · Apr 7, 2026 · N421UP · Boeing 75724APF · Wing, Plate/Skin > RH WING BETWEEN SLAT# 8 AND #9 ON FIXED LEADING EDGE SKIN IN CRACKED. COMPLIED WITH STEP FOR EO-97223-REQ1 AND VT-MAE EA 757-5741-27-A4443, REV-, PRIOR TO FURTHER FLIGHT IS DOCUMENTED ON T3F18E008PRFY - [SDR IPXA2026041183869](https://openairdocs.org/sdr/IPXA2026041183869.md): Skin · dented · Apr 7, 2026 · N421UP · Boeing 75724APF · Fuselage Main, Plate/Skin > EXTERNAL FUSELAGE BETWEEN BS 1700 - 1720, S16-17L DENTED. COMPLIED WITH EO-97220-REQ1 AND EA 757-5360-27-A4433. - [SDR IPXA2026041183937](https://openairdocs.org/sdr/IPXA2026041183937.md): Skin · dented · Apr 7, 2026 · N421UP · Boeing 75724APF · Fuselage Main, Plate/Skin > EXTERNAL FUSELAGE SKIN BETWEEN BS 1720 - 1743, S29L - 28L HAS A PROTRUDING DENT. ACCOMPLISH REPAIR PER EO-97221-REQ1 & EA 757-5380-27-A4434. Next page: https://openairdocs.org/aircraft/N421UP/reports.md?page=2 ## 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 n_number = 'N421UP' AND registry_match = 'registration' ORDER BY difficulty_date DESC ``` This list as a web page: https://openairdocs.org/aircraft/N421UP/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.