# N421UP: 1991 Boeing 757-24APF

- Status: Valid registration
- Airframe: [Boeing 757-24APF](https://openairdocs.org/model/boeing-757-24apf) (registry code 1384969, 178 seats)
- Engine: [Pratt & Whitney PW2040](https://openairdocs.org/engine/pratt-whitney-pw2040) (registry code 52121)
- Data sheets: [TCDS E17NE](https://openairdocs.org/tcds/E17NE) (Pratt & Whitney) (OpenAirDocs)
- Serial number: 25281
- Year built: 1991
- Type: Fixed wing multi engine
- Engine type: Turbo-fan
- Airworthiness: Standard, transport
- Airworthiness date: September 27, 1991
- Certificate issued: November 19, 1991
- Expires: November 30, 2028
- Mode S code: A50126
- Registered owner: [United Parcel Service Co](https://openairdocs.org/faa-owner/UNITED%20PARCEL%20SERVICE%20CO)
- Location: [Louisville, KY](https://openairdocs.org/faa-place/KY/Louisville)
- Owner type: Corporation
- Owner's area on the map: 38.2585° N, 85.5398° W: Placed by OpenAirDocs at the center of ZIP code 40223, within about 2 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=421UP
- Page: https://openairdocs.org/aircraft/N421UP

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.

## ADs that may apply (OpenAirDocs): 15 in force

### Matched by airframe (Boeing 757-24APF)

None in force.

### Matched by engine (Pratt & Whitney PW2040)

- [AD 2026-07-06](https://openairdocs.org/ad/2026-07-06): Turbine Section · Pratt & Whitney F117-PW-100, PW2037, PW2037D and 3 more. Effective May 29, 2026
- [AD 2024-12-04](https://openairdocs.org/ad/2024-12-04): Turbine Section · Pratt & Whitney PW2037, PW2037M and PW2040. Effective Aug 13, 2024
- [AD 2021-14-13](https://openairdocs.org/ad/2021-14-13): Turbine Section · Pratt & Whitney F117-PW-100, PW2037, PW2037M and 1 more. Effective Sep 1, 2021
- [AD 2019-05-01](https://openairdocs.org/ad/2019-05-01): Turbine/Turboprop Engine · Pratt & Whitney F117-PW-100, PW2037, PW2037D and 6 more. Effective Apr 16, 2019
- [AD 2018-22-06](https://openairdocs.org/ad/2018-22-06): Fuel Control/Turbine Engines · Pratt & Whitney PW2037, PW2037M and PW2040. Effective Dec 3, 2018
- [AD 2018-14-10](https://openairdocs.org/ad/2018-14-10): Fuel Control Turbine Engines · Pratt & Whitney PW2037, PW2037M and PW2040. Effective Sep 28, 2018
- [AD 2012-02-01](https://openairdocs.org/ad/2012-02-01): Fan blades · Pratt & Whitney Division PW2037, PW2037M and PW2040. Effective Apr 24, 2012
- [AD 2009-14-05](https://openairdocs.org/ad/2009-14-05): High-pressure compressor (HPC) · Pratt & Whitney Division PW2037, PW2037M and PW2040. Effective Jul 23, 2009
- [AD 2009-10-08](https://openairdocs.org/ad/2009-10-08): High-pressure turbine 2nd stage hubs that have previously been exposed to Pratt & Whitney cleaning procedure SPOP 10 or SPOP 9 or equivalent procedure. · Pratt & Whitney Division PW2037, PW2037M and PW2040. Effective Jun 17, 2009
- [AD 2007-02-06](https://openairdocs.org/ad/2007-02-06): High pressure compressor (HPC) drum rotor disk assemblies · Pratt & Whitney Division PW2037, PW2037M and PW2040. Effective Feb 28, 2007
- [AD 2005-18-03](https://openairdocs.org/ad/2005-18-03): Engine manufacturer's time limits section (TLS) · Pratt & Whitney Division PW2037, PW2037D, PW2037M and 5 more. Effective Feb 28, 2006
- [AD 99-20-03](https://openairdocs.org/ad/99-20-03): High Pressure Turbine Disks · Pratt & Whitney Division PW2037, PW2037M, PW2040 and 2 more. Effective Nov 23, 1999
- [AD 96-18-08 R1](https://openairdocs.org/ad/96-18-08-R1): (HPT) High Pressure or (LPT) Low Pressure Turbine · Pratt & Whitney Division PW2037, PW2037M, PW2040 and 2 more. Effective Nov 10, 1998
- [AD 97-11-51 R1](https://openairdocs.org/ad/97-11-51-R1): First Stage High Pressure Turbine (HPT) Disk Assembly · Pratt & Whitney Division PW2037, PW2037M, PW2040 and 5 more. Effective Aug 7, 1997
- [AD 88-03-52](https://openairdocs.org/ad/88-03-52): Fuel Quantity Indication System · Pratt & Whitney Division PW2037 and PW2040. Effective Jul 13, 1988

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

- [AD 2017-12-03](https://openairdocs.org/ad/2017-12-03) (historical): Fuel Control Turbine Engines · Pratt & Whitney PW2037, PW2037M and PW2040. Effective Jul 20, 2017
- [AD 2017-11-06](https://openairdocs.org/ad/2017-11-06) (historical): Turbine/ Turboprop Engine · Pratt & Whitney F117-PW-100, PW2037, PW2037D and 6 more. Effective Jul 18, 2017
- [AD 2014-05-32](https://openairdocs.org/ad/2014-05-32) (historical): Diffuser-to-high-pressure turbine (HPT) case flange · Pratt & Whitney F117-PW-100, PW2037, PW2037D and 8 more. Effective May 5, 2014
- [AD 2002-12-06](https://openairdocs.org/ad/2002-12-06) (historical): Time Limits Section (TLS) · Pratt & Whitney Division PW2037, PW2037M, PW2040 and 5 more. Effective Jul 17, 2002
- [AD 2000-21-09](https://openairdocs.org/ad/2000-21-09) (historical): Critical Life-limited Parts · Pratt & Whitney Division PW2037, PW2037M, PW2040 and 5 more. Effective Jan 22, 2001
- [AD 99-08-14](https://openairdocs.org/ad/99-08-14) (historical): Maintenance Program, Mandatory Inspections · Pratt & Whitney Division PW2037, PW2037M, PW2040 and 5 more. Effective May 13, 1999

## Information bulletins (advisory)

None matched.

## NTSB investigations

None matched to N421UP.

## FAA accident and incident reports

None matched to N421UP.

## Service difficulty reports (311, newest 50)

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 IPXA2026043058730](https://openairdocs.org/sdr/IPXA2026043058730), Apr 30, 2026: INTERCOSTAL. CORRODED. 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
- [SDR IPXA2026043058603](https://openairdocs.org/sdr/IPXA2026043058603), Apr 30, 2026: BRACKET. CRACKED. 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), Apr 25, 2026: BRACKET. CRACKED. 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
- [SDR IPXA2026042090836](https://openairdocs.org/sdr/IPXA2026042090836), Apr 20, 2026: SKIN. CRACKED. 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), Apr 17, 2026: TEE ANGLE. CORRODED. 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), Apr 16, 2026: SUPPORT ANGLE. CORRODED. 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), Apr 14, 2026: FLOOR PANEL. DAMAGED. 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), Apr 14, 2026: FLOOR PANEL. DAMAGED. 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-164
- [SDR IPXA2026042901327](https://openairdocs.org/sdr/IPXA2026042901327), Apr 14, 2026: FLOOR PANEL. DAMAGED. 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-
- [SDR IPXA2026050401890](https://openairdocs.org/sdr/IPXA2026050401890), Apr 14, 2026: FLOORBOARD. DAMAGED. 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), Apr 14, 2026: FLOOR PANEL. DAMAGED. 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-1640
- [SDR IPXA2026050482714](https://openairdocs.org/sdr/IPXA2026050482714), Apr 14, 2026: BRACKET. DAMAGED. 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), Apr 14, 2026: FLOORBEAM. CORRODED. 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 1
- [SDR IPXA2026041897324](https://openairdocs.org/sdr/IPXA2026041897324), Apr 14, 2026: FLOORBEAM. CORRODED. 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 STRU
- [SDR IPXA2026041895658](https://openairdocs.org/sdr/IPXA2026041895658), Apr 14, 2026: FLOORBEAM. CORRODED. 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 
- [SDR IPXA2026042295134](https://openairdocs.org/sdr/IPXA2026042295134), Apr 14, 2026: FLOORBEAM. CRACKED. 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 THIC
- [SDR IPXA2026041795275](https://openairdocs.org/sdr/IPXA2026041795275), Apr 14, 2026: SEAT TRACK. CORRODED. 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 S
- [SDR IPXA2026041794389](https://openairdocs.org/sdr/IPXA2026041794389), Apr 14, 2026: SEAT TRACK. CORRODED. 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 O
- [SDR IPXA2026041798932](https://openairdocs.org/sdr/IPXA2026041798932), Apr 14, 2026: COVER PLATE. CRACKED. 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 
- [SDR IPXA2026042875633](https://openairdocs.org/sdr/IPXA2026042875633), Apr 13, 2026: FLOOR PANEL. BROKEN. 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 I
- [SDR IPXA2026042880111](https://openairdocs.org/sdr/IPXA2026042880111), Apr 13, 2026: FLOOR PANEL. DAMAGED. 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 I
- [SDR IPXA2026041353887](https://openairdocs.org/sdr/IPXA2026041353887), Apr 11, 2026: STRAP. CORRODED. 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
- [SDR IPXA2026041355642](https://openairdocs.org/sdr/IPXA2026041355642), Apr 11, 2026: INTERCOSTAL. CORRODED. 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. INSTALLE
- [SDR IPXA2026042355714](https://openairdocs.org/sdr/IPXA2026042355714), Apr 11, 2026: ANGLE. CRACKED. 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 
- [SDR IPXA2026041853943](https://openairdocs.org/sdr/IPXA2026041853943), Apr 11, 2026: STRAP. CORRODED. 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 RI
- [SDR IPXA2026041337727](https://openairdocs.org/sdr/IPXA2026041337727), Apr 10, 2026: INTERCOSTAL. CORRODED. 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 REINS
- [SDR IPXA2026050237740](https://openairdocs.org/sdr/IPXA2026050237740), Apr 10, 2026: TEE ANGLE. CORRODED. 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), Apr 10, 2026: TEE FITTING. CORRODED. 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 
- [SDR IPXA2026042837737](https://openairdocs.org/sdr/IPXA2026042837737), Apr 10, 2026: TEE FITTING. CORRODED. 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 
- [SDR IPXA2026041543021](https://openairdocs.org/sdr/IPXA2026041543021), Apr 10, 2026: BRACKET. CRACKED. 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 STR
- [SDR IPXA2026042043065](https://openairdocs.org/sdr/IPXA2026042043065), Apr 10, 2026: ATTACH BRACKET. CRACKED. 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 LOWE
- [SDR IPXA2026042043018](https://openairdocs.org/sdr/IPXA2026042043018), Apr 10, 2026: ACCESS PANEL. CRACKED. -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 LOWE
- [SDR IPXA2026041025522](https://openairdocs.org/sdr/IPXA2026041025522), Apr 9, 2026: STRAP. CORRODED. 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
- [SDR IPXA2026050121290](https://openairdocs.org/sdr/IPXA2026050121290), Apr 9, 2026: BEAM. DAMAGED. 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), Apr 9, 2026: TEE ANGLE. CORRODED. 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 AN
- [SDR IPXA2026041423711](https://openairdocs.org/sdr/IPXA2026041423711), Apr 9, 2026: TEE FITTING. CORRODED. 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 
- [SDR IPXA2026050205159](https://openairdocs.org/sdr/IPXA2026050205159), Apr 8, 2026: BRACKET. CHAFED. 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), Apr 8, 2026: FRAME. DENTED. 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), Apr 8, 2026: FRAME. DAMAGED. 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), Apr 8, 2026: FRAME. DAMAGED. 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), Apr 8, 2026: FRAME. DENTED. 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), Apr 8, 2026: FRAME. DAMAGED. 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), Apr 8, 2026: SUPPORT BRACKET. CRACKED. 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 
- [SDR IPXA2026042104911](https://openairdocs.org/sdr/IPXA2026042104911), Apr 8, 2026: TEE ANGLE. CORRODED. 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
- [SDR IPXA2026042205165](https://openairdocs.org/sdr/IPXA2026042205165), Apr 8, 2026: BALL MAT. CORRODED. 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
- [SDR IPXA2026042205156](https://openairdocs.org/sdr/IPXA2026042205156), Apr 8, 2026: BALL MAT. CORRODED. 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 5
- [SDR IPXA2026041705118](https://openairdocs.org/sdr/IPXA2026041705118), Apr 8, 2026: STRUCTURE. CORRODED. 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. REVIE
- [SDR IPXA2026050883072](https://openairdocs.org/sdr/IPXA2026050883072), Apr 7, 2026: SKIN. CRACKED. 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 FURTH
- [SDR IPXA2026041183869](https://openairdocs.org/sdr/IPXA2026041183869), Apr 7, 2026: SKIN. DENTED. 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), Apr 7, 2026: SKIN. DENTED. EXTERNAL FUSELAGE SKIN BETWEEN BS 1720 - 1743, S29L - 28L HAS A PROTRUDING DENT. ACCOMPLISH REPAIR PER EO-97221-REQ1 & EA 757-5380-27-A4434.

All 311: https://openairdocs.org/aircraft/N421UP/reports.md

## Service difficulty reports on N421UP not matched to an aircraft (1)

They name N421UP, but no registry record covers the date, the aircraft registered then was built later, or the report describes another aircraft.

- [SDR 98ZZZX4507](https://openairdocs.org/sdr/98ZZZX4507), Nov 10, 1998: CASE. CRACKED. CASE CRACKED BELOW NR 3 CYLINDER TOP STUD SECOND FROM THE FRONT. FOUND DURING CYLINDER REMOVAL TO REPLACE BASE SEAL. CRACK ABOUT .50 INCH LONG.

## STCs that may be installed (OpenAirDocs)

None matched to this aircraft's models.

## Related

- Other Boeing 757-24APF aircraft: https://openairdocs.org/model/boeing-757-24apf/aircraft.md
- The Pratt & Whitney PW2040 engine: https://openairdocs.org/engine/pratt-whitney-pw2040.md

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