- Registered owner
- United Airlines Inc
- Location
- Chicago, IL
- Owner type
- Corporation
- Serial number
- 28940
- Year built
- 1999
- Type
- Fixed wing multi engine
- Engine
- Turbo-fan
- Airworthiness
- Standard, transport
- Airworthiness date
- March 9, 1999
- Certificate issued
- March 10, 1999
- Expires
- October 31, 2029
- Mode S code
- A22539
From the FAA registry file of October 24, 2026. The registry lists only the engine series, so ADs for every CFM International CFM56 model are included below.
On this page
Airworthiness directives that may apply · 378
Matched by this aircraft’s airframe and engine models. Each AD’s applicability may narrow it by serial number, part number or equipment.
| 1968 | 1 |
|---|---|
| 1969 | 1 |
| 1970 | 4 |
| 1975 | 4 |
| 1976 | 3 |
| 1977 | 1 |
| 1978 | 1 |
| 1979 | 2 |
| 1980 | 3 |
| 1981 | 1 |
| 1982 | 2 |
| 1983 | 1 |
| 1984 | 2 |
| 1985 | 6 |
| 1986 | 6 |
| 1987 | 2 |
| 1988 | 8 |
| 1989 | 7 |
| 1990 | 13 |
| 1991 | 9 |
| 1992 | 8 |
| 1993 | 3 |
| 1994 | 1 |
| 1995 | 3 |
| 1996 | 3 |
| 1997 | 11 |
| 1998 | 13 |
| 1999 | 11 |
| 2000 | 12 |
| 2001 | 24 |
| 2002 | 16 |
| 2003 | 10 |
| 2004 | 11 |
| 2005 | 14 |
| 2006 | 10 |
| 2007 | 12 |
| 2008 | 19 |
| 2009 | 9 |
| 2010 | 18 |
| 2011 | 11 |
| 2012 | 9 |
| 2013 | 20 |
| 2014 | 13 |
| 2015 | 8 |
| 2016 | 11 |
| 2017 | 9 |
| 2018 | 8 |
| 2019 | 13 |
| 2020 | 7 |
| 2021 | 12 |
| 2022 | 8 |
| 2023 | 9 |
| 2024 | 5 |
| 2025 | 8 |
| 2026 | 5 |
Airframe · Boeing 737-724
AD 2026-20-14StabilizersAD 2026-20-13Equipment/furnishingsAD 2026-13-13NavigationInformation bulletins that may apply · 22
Advisory, not mandatory.
See all 27 bulletins
NTSB investigations
No NTSB investigations matched to N23721Matched by N-number and event date, checked against the reported serial number, make and model. Investigations from before this aircraft carried the mark are under Earlier aircraft. Investigations on Boeing 737-724 aircraft
FAA incident reports
No FAA accident or incident reports matched to N23721Matched by N-number and event date, checked against the reported make and model. Reports from before this aircraft carried the mark are under Earlier aircraft. Reports on Boeing 737-724 aircraft
Service difficulty reports · 100
Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model.
SDR CALA2026020213491Adiru · faultedAFTER TAKE OFF, BOTH CA & FO LOST BOTH HEADING AND LATERAL INDICATIONS, FO DATA CAME BACK. ACP DCFS BITE, BPCS, GCU 1 & 2, NO FAULTS. LT ADIRU HAS ENTER HEADING FAULT ON LAST LEG MAIT MESSAGE 34-21009 FIM 34-21 TASK 808 INITIAL EVALUATION SHOWED NO CURRENT SDR CALA2025120811861Stringer · corrodedSTRINGER 27L HAS CORROSION BETWEEN BS 360 & 380 AT PRODUCTION SPLICE. CUT STRINGER 27L FROM BS 338 TO FACTORY SPLICE AND FROM FACTORY SPLICE IAW SRM 51-10-02. STR 27L FWD OF FACTORY SPLICE WILL NOW BE COVERED BY LOG PAGE 7064237. PERFORMED HFEC INSPECTION OFSDR CALA2025120811845Skin · crackedDURING HOLE PROBE INSPECTION FOUND DEFECT IN ONE FASTENER COMMON TO S-27L AT STA 372 AND ONE FASTENER COMMON TO SHEAR TIE AT BS 372 ABOVE S27AS IAW SRM 51-10-02, REAMED HOLE IN SHEAR TIE AREA, SKIN ONLY, TO .233" CRACK INDICATION GONE, REAMED HOLE IN STR 27L,
See all 100 reportsSTCs that may be installed · 830
Approved for this aircraft’s airframe or engine model. The registry doesn’t record which STCs an aircraft has; its records do.
See all 830 STCs