# JASC 5315: Fuselage Main, Floor Beam

- Type: JASC system/component code (FAA)
- ATA chapter: 53 Fuselage
- Title in the code table: FUSELAGE MAIN, FLOOR BEAM
- Service difficulty reports: 44,152
- FAA code table: https://www.faa.gov/sites/faa.gov/files/JASC_Code.pdf#page=47
- Page: https://openairdocs.org/jasc/5315

## What it covers

For reports of the main fuselage floor beams.

## Service difficulty reports (44,152, newest 50)

- [SDR DALA2026102105769](https://openairdocs.org/sdr/DALA2026102105769), Oct 16, 2026: Boeing 737932ER. FLOORBEAM. CORRODED. AFT GALLEY WET AREA FLOORBEAM AT STA 986.5 CORROSION AT MULTIPLE SPOT. CORRECTIVE ACTION: REMOVED CORROSION ON AFT GALLE (N891DN)
- [SDR AALA202610204890](https://openairdocs.org/sdr/AALA202610204890), Oct 14, 2026: Boeing 7378. FLOORBEAM. CORRODED. AIRCRAFT IN BASE MAINTENANCE: CORROSION ON FLOORBOARD SUPPORT. REMOVED AND REPLACED IAW AARD 51-00-05-1 AND BOEING DRAWI (N316SE)
- [SDR FDEA202610141565](https://openairdocs.org/sdr/FDEA202610141565), Oct 14, 2026: Airbus A300B4622R. FLOORBEAM. CORRODED. BULK CARGO FLOOR SUPPORT AT FR 66, BTW Y805 AND -Y805 UPPER SURFACE FOUND HEAVY CORROSION. (N745FD)
- [SDR AALA202610204466](https://openairdocs.org/sdr/AALA202610204466), Oct 13, 2026: Boeing 737823. FLOORBEAM. CORRODED. AIRCRAFT IN BASE MAINTENANCE: FILFORM CORROSION ON FLOORBEAM AT STA 947. MAINTENANCE REPALCED T-CAP AT STA 947 IAW 53-70 (N959NN)
- [SDR FDEA202610131562](https://openairdocs.org/sdr/FDEA202610131562), Oct 13, 2026: Airbus A300B4622R. FLOORBEAM. CORRODED. AFT CARGO FLOOR SUPPORT AT FR63 -Y805 LWR SURFACE FOUND CORROSION. (N745FD)
- [SDR AALA202610161764](https://openairdocs.org/sdr/AALA202610161764), Oct 12, 2026: Boeing 737823. FLOORBEAM. CORRODED. AIRCRAFT IN BASE MAINTENANCE: AFT CABIN WET AREA PASSENGER FLOOR STRUCTURE UPPER SURFACE APPROX STA 986.5 LBL 45 - EVIDE (N819NN)
- [SDR AALA202610145309](https://openairdocs.org/sdr/AALA202610145309), Oct 12, 2026: Boeing 737823. FLOORBEAM. CORRODED. AIRCRAFT IN BASE MAINTENANCE: AFT WET FLOOR BEAM STA 947.5 LBL 58 CORRODED. REPAIRED FLOOR BEAM STA 947.5 BTW LBL 60 TO  (N819NN)
- [SDR YENA2026101500953](https://openairdocs.org/sdr/YENA2026101500953), Oct 11, 2026: Airbus A320232. FLOORBEAM. CRACKED. DURING HEAVY MAINTENANCE, EA 26-807-01 WINGS / CENTER WING / FRONT SPAR / VERTICAL STRINGERS & HORIZONTAL FLOOR BEAMS /  (N588JB)
- [SDR FDEA202610091536](https://openairdocs.org/sdr/FDEA202610091536), Oct 9, 2026: Boeing 7572G5. FLOORBEAM. CORRODED. MAIN CARGO COMPARTMENT FLOORBEAM BS 1200 BETWEEN 24LBL TO 0BL SOME AREAS WITH CORROSION. AREA OUT OF LIMITS WAS REPAIRED (N943FD)
- [SDR AALA202610206378](https://openairdocs.org/sdr/AALA202610206378), Oct 7, 2026: Boeing 7378. FLOORBEAM. CORRODED. AIRCRAFT IN BASE MAINTENANCE: CORROSION TO FLOORBOARD SUPPORT HOLE. REMOVED AND REPLACED IAW AARD 51-00-05-1 AND BOEING  (N316SE)
- [SDR IPXA2026101746122](https://openairdocs.org/sdr/IPXA2026101746122), Oct 7, 2026: Boeing 75724APF. FLOORBEAM. CORRODED. UNDER DECK PLATE AT STA 1716 FROM RBL 5 AND LBL 5 HAS NUTPLATES WITH RUST. INSTALLED ANGLE IN UNDER DECK PLATE AT STA 17 (N462UP)
- [SDR IPXA2026101646046](https://openairdocs.org/sdr/IPXA2026101646046), Oct 7, 2026: Boeing 75724APF. PLATE. CORRODED. FLOORBEAM AT BS 1680 HAS A CORRODED PLATES FROM RBL 5 TO RBL 35. INSTALLED PLATES (4 EA) ON BS 1680, RBL 5 TO RBL 35 IAW (N462UP)
- [SDR AALA202610087947](https://openairdocs.org/sdr/AALA202610087947), Oct 7, 2026: Boeing 737823. FLOORBEAM. CORRODED. AIRCRAFT IN BASE MAINTENANCE: AFT CABIN WET AREA PASSENGER FLOOR STRUCTURE UPPER SURFACE AT STA 947.5 APPROX LBL 33 - FL (N819NN)
- [SDR AALA202610084978](https://openairdocs.org/sdr/AALA202610084978), Oct 7, 2026: Boeing 737823. FLOORBEAM. CORRODED. AIRCRAFT IN BASE MAINTENANCE: AFT CABIN WET AREA PASSENGER FLOOR STRUCTURE UPPER SURFACE AT STA 947.5 APPROX BL 0 - FOUR (N819NN)
- [SDR AALA202610089312](https://openairdocs.org/sdr/AALA202610089312), Oct 7, 2026: Boeing 737823. FLOORBEAM. CORRODED. AIRCRAFT IN BASE MAINTENANCE: AFT CABIN WET AREA PASSENGER FLOOR STRUCTURE UPPER SURFACE AT STA 947.5 RBL 50 - FLOOR STR (N819NN)
- [SDR UIEA2026100400942](https://openairdocs.org/sdr/UIEA2026100400942), Oct 7, 2026: Boeing 74745EF. FLOORBEAM. CORRODED. FOUND CORROSION ON MAIN DECK FLOOR BEAM AT STA 460 LBL 53.(<P>REPAIR CARRIED OUT ON CORROSION FLOOR BEAM PER EN 3785-26  (N486MC)
- [SDR UIEA2026092900924](https://openairdocs.org/sdr/UIEA2026092900924), Oct 7, 2026: Boeing 74745EF. FLOORBEAM. CORRODED. DURING HFEC INSPECTION AT FLOOR BEAM UPPER CHORD LOWER SURFACE STA 660 LHS, FOUND CORROSION &AMP; CRACK APPROX 0.15" AS  (N486MC)
- [SDR IPXA2026101326754](https://openairdocs.org/sdr/IPXA2026101326754), Oct 6, 2026: Boeing 75724APF. FLOORBEAM. CORRODED. MAIN DECK CABIN BS 1681 AND BTW BL 0 TO RBL 24.75 FLOOR BEAM HAVE EXFOLATION, FLL-045. (N404UP)
- [SDR AALA202610085393](https://openairdocs.org/sdr/AALA202610085393), Oct 6, 2026: Boeing 737823. FLOORBEAM. CRACKED. AIRCRAFT IN BASE MAINTENANCE: MAIN CABIN FLOOR SUPPORT CRACKED AT BS 540 LBL 2. REMOVED AND REPLACED NEW SUPPORT/ BREAK  (N819NN)
- [SDR FDEA202610061485](https://openairdocs.org/sdr/FDEA202610061485), Oct 6, 2026: Boeing 757236. FLOORBEAM. CORRODED. MAIN DECK FLOOR STRUCTURE CROSSBEAM HAS CORROSION AT THE UPPER FWD FLANGE AT BS 377 FROM LBL 26 TO LBL 56. REPAIRED CROS (N946FD)
- [SDR CALA2026101520378](https://openairdocs.org/sdr/CALA2026101520378), Oct 5, 2026: Boeing 737824. FLOORBEAM. CORRODED. CORROSION AROUND FASTENER HOLE IN FLOORBEAM, BS 967, LBL 18, RBL 13, RBL 16. REPAIRED THE FLOORBEAM IAW EO 5320-23025, R (N24212)
- [SDR CALA2026101220295](https://openairdocs.org/sdr/CALA2026101220295), Oct 5, 2026: Boeing 737824. FLOORBEAM. CORRODED. CORROSION ON MAIN DECK FLOOR BEAM LBL 44-56 B. STA 344 REPAIRED FLOOR BEAM AT STA 344 PER EO 5320-23026 REV A, REV B AN  (N24212)
- [SDR CALA2026100620130](https://openairdocs.org/sdr/CALA2026100620130), Oct 3, 2026: Airbus A319131. FLOORBEAM. CORRODED. AFT WET AREA, LT FLOOR BEAM Y160.5, BARREL NUT CORRODED IN LAV MOUNT FITTING, JUST AFT OF FR 68. REMOVED AND REPLACED L/ (N836UA)
- [SDR JR2R20261003862](https://openairdocs.org/sdr/JR2R20261003862), Oct 3, 2026: Emb ERJ170200LL. FLOORBEAM. CORRODED. AFT WET AREA, FR84 CROSSBEAM AT RBL25-RBL31 IS CORRODED. REPAIRED PER ETD. (N85320)
- [SDR JR2R20261003830](https://openairdocs.org/sdr/JR2R20261003830), Oct 3, 2026: Emb ERJ170200LL. FLOORBEAM. CORRODED. FORWARD WET AREA, RBL10 FR17 EXISTING REPAIR DOUBLER ON BEAM IS CORRODED. REPAIRED PER SRM. (N88327)
- [SDR JR2R20261003831](https://openairdocs.org/sdr/JR2R20261003831), Oct 3, 2026: Emb ERJ170200LL. FLOORBEAM. CORRODED. FORWARD WET AREA, FR14 CROSSBEAM AT RBL10-RBL30 IS CORRODED. REPAIRED PER SRM. (N85320)
- [SDR CALA2026100520081](https://openairdocs.org/sdr/CALA2026100520081), Oct 2, 2026: Boeing 7379. FLOORBEAM. CORRODED. FOUND CORROSION AFT OF AFT CARGO COMPARTMENT BILGE FLOORBEAM AFT FACE BETWEEN S27L T0 S27R BS 927. REMOVED DAMAGE, FOUND (N77578)
- [SDR CALA2026100520073](https://openairdocs.org/sdr/CALA2026100520073), Oct 2, 2026: Boeing 737824. FLOORBEAM. CORRODED. CORROSION ON FLOORBEAM UPPER SURFACE FROM LBL 50 TO LBL 59, BS 344. ACCOMPLISHED A FLOORBEAM REPAIR AT BS 344 BETWEEN LB (N37293)
- [SDR DALA2026093005446](https://openairdocs.org/sdr/DALA2026093005446), Sep 30, 2026: Boeing 737932ER. FLOORBEAM. CORRODED. AFT WET AREA STA 986.5 BL0-RBL42 FLOOR BEAM CAP CORRODED AROUND FASTENER HOLES. REPAIRED FLOORBEAM STA 986.5 FROM LBL50  (N889DN)
- [SDR ASAA2026092969379](https://openairdocs.org/sdr/ASAA2026092969379), Sep 29, 2026: Boeing 737890. FLOORBEAM. CORRODED. UPON INSTALLING INTERCOSTAL FOUND CORROSION ON FLOOR BEAM AT STA 312, LBL-23. GROUNDED - YES. REMOVED DAMAGE, FOUND TO B (N564AS)
- [SDR SWIA2026092977788](https://openairdocs.org/sdr/SWIA2026092977788), Sep 29, 2026: Cndair CL6002C10. FLOORBEAM. CRACKED. FS22000 RBL 12 COCKPIT FLOORBEAM POSSIBLE CRACK, INSIDE PANEL 132AR MARKED FILED CLOSEDREMOVED AND INSTALLED NEW ANGLE R (N632SK)
- [SDR AALA202610207420](https://openairdocs.org/sdr/AALA202610207420), Sep 26, 2026: Boeing 737823. FLOORBEAM. CORRODED. AIRCRAFT IN BASE MAINTENANCE: CORROSION ON FLOOR BEAM T-CAP AT STA 927, RBL 24 MAINTENANCE REPLACED FLOOR BEAM T-CAP AT  (N959NN)
- [SDR AALA202610203521](https://openairdocs.org/sdr/AALA202610203521), Sep 24, 2026: Boeing 737823. FLOORBEAM. CORRODED. AIRCRAFT IN BASE MAINTENANCE: CORROSION AROUND FASTENER HOLE ON FLOOR BEAM STA 947 RBL 50. REPLACE ENTIRE 947 FLOOR BEAM (N959NN)
- [SDR AALA202610204269](https://openairdocs.org/sdr/AALA202610204269), Sep 24, 2026: Boeing 737823. FLOORBEAM. CORRODED. AIRCRAFT WAS GROUNDED: EXFOLIATION CORROSION ON FLOOR BEAM AT LH OB AFT LAV MOUNT STA 947, LBL 49. MAINTENANCE REPLACED  (N959NN)
- [SDR CALA2026092519838](https://openairdocs.org/sdr/CALA2026092519838), Sep 24, 2026: Airbus A319131. FLOORBEAM. DAMAGED. FWD CARGO FLOORBEAM, FR28, STR 38R-38L HAD MULTIPLE ELONGATED HOLES . REMOVED AND REPLACED FLOORBEAM IAW SRM 51-42-11-00 (N836UA)
- [SDR LR7A2026092403951](https://openairdocs.org/sdr/LR7A2026092403951), Sep 24, 2026: Lkheed 382G. FLOORBEAM. CORRODED. DURING SCHEDULED C-15 CHECK WHILE PERFORMING OTHER MAINTENANCE, FOUND UNDERFLOORBEAM LOWER CAP CORRODED AT FS577, BL61L/ (N403LC)
- [SDR DALA2026092505352](https://openairdocs.org/sdr/DALA2026092505352), Sep 23, 2026: Boeing 737932ER. FLOORBEAM. CORRODED. CORROSION OUT OF LIMITS ON FLOORBEAM UPPER AND LOWER SIDE BS 986, BTWN RBL 23 - 24 AND BTWN RBL 33 - 34 IN THE PAX CABIN (N895DN)
- [SDR N6WA2026092401](https://openairdocs.org/sdr/N6WA2026092401), Sep 23, 2026: Cndair CL6002C11. FLOORBEAM. CRACKED. BS 280 BULKHEAD FLOORBEAM ANGLE RBL26 CRACKED. REMOVED AND REPLACED ANGLE RBL 26 ON BS 280 BULKHEAD FLOORBEAM IAW SRM 51 (N581GJ)
- [SDR AALA202610208702](https://openairdocs.org/sdr/AALA202610208702), Sep 22, 2026: Boeing 737823. FLOORBEAM. CORRODED. AIRCRAFT IN BASE MAINTENANCE: RH AFT LAV I/B MOUNT CORRODED ON BEAM STA 947 RBL25. REMOVED AND REPLACED TEE CAP IAW SRM  (N811NN)
- [SDR AALA202610201470](https://openairdocs.org/sdr/AALA202610201470), Sep 22, 2026: Boeing 737823. FLOORBEAM. CORRODED. AIRCRAFT IN BASE MAINTENANCE: CABIN AFT WET AREA RH LAV O/B MOUNT BEAM CORRODED AT STA 947 RBL50. REPAIR T-CAP IAW SRM 5 (N811NN)
- [SDR AALA202610206702](https://openairdocs.org/sdr/AALA202610206702), Sep 22, 2026: Boeing 737823. FLOORBEAM. CORRODED. AIRCRAFT IN BASE MAINTENANCE: CABIN AFT WET AREA LH O/B LAV MOUNT BEAM CORRODED AT STA 947 LBL 50. REMOVED AND INSTALLED (N811NN)
- [SDR DALA2026092905403](https://openairdocs.org/sdr/DALA2026092905403), Sep 22, 2026: Boeing 767432ER. FLOORBEAM. CORRODED. CORROSION FLOOR BEAM UPPER FLANGE OF BSTA 1480 AND LBL49 AT AFT GALL EY AREA. REPLACED UPPER FLANGE ON FLOOR BEAM OF BST (N843MH)
- [SDR KCSA202609221216](https://openairdocs.org/sdr/KCSA202609221216), Sep 22, 2026: Boeing 7474B5. FLOORBEAM. CORRODED. RT UPPER DECK FLOOR FRAME UPPER TEE, AT BS 340 CORRODED AT RBL 32. (N708CK)
- [SDR YENA2026092300891](https://openairdocs.org/sdr/YENA2026092300891), Sep 21, 2026: Airbus A320232. FLOORBEAM. CORRODED. DURING HEAVY MAINTENANCE, CORROSION ON FLOORBEAM -Y765 IN THE AFT GALLEY AREA. REMOVED AND REPLACED THE FLOORBEAM IAW SR (N588JB)
- [SDR DALA2026092305319](https://openairdocs.org/sdr/DALA2026092305319), Sep 21, 2026: Boeing 737932ER. FLOORBEAM. CORRODED. CORROSION OUT OF LIMITS, IN REF TO NRC 00251: CORROSION ON FLOORBEAM UPPER AND LOWER SIDE STA 947 RBL 48 TO RBL 50 APRX  (N895DN)
- [SDR AALA202610052744](https://openairdocs.org/sdr/AALA202610052744), Sep 19, 2026: Airbus A321231. FLOORBEAM. CORRODED. AIRCRAFT IN BASE MAINTENANCE: CORROSION ON AFT CABIN FLOOR BEAM AT FR 68 AND Y1162 LEFT - REPLACED FLOOR BEAM PER SRM 51 (N120EE)
- [SDR MASA20261001227](https://openairdocs.org/sdr/MASA20261001227), Sep 19, 2026: Emb ERJ170200LL. FLOORBEAM. CORRODED. DURING HEAVY CHECK, FWD WET AREA, CORRODED FLOORBEAM ANGLE AT FR 16 R/H, RBL 30, R & R WITH NEW, IAW SRM 51-41-01, NRG 4 (N88328)
- [SDR MASA20261001226](https://openairdocs.org/sdr/MASA20261001226), Sep 19, 2026: Emb ERJ170200LL. FLOORBEAM. CORRODED. DURING HEAVY CHECK FWD WET AREA, CORRODED FLOOR PANEL SUPPORT ANGLE AT FR 18, LBL 30, REMOVED AND REPLACED WITH NEW IAW  (N88328)
- [SDR SIMA20260918008](https://openairdocs.org/sdr/SIMA20260918008), Sep 18, 2026: Emb ERJ170200LR. FLOORBEAM. CORRODED. AFT WET AREA FLOOR STRUCTURE - CORROSION ON SPLICE FR 90 Y-11" AND Y-7" (LEVEL 2 CORROSION). REMOVED AND REPLACED SPLICE (N217NN)
- [SDR YENA2026091800855](https://openairdocs.org/sdr/YENA2026091800855), Sep 18, 2026: Airbus A320232. FLOORBEAM. CRACKED. DURING HEAVY MAINTENANCE, CRACK INDICATION FOUND ON THE HORIZONTAL FLOOR BEAM RADIUS BACKSIDE OF THE FRONT SPAR VERTICAL (N523JB)

All 44,152: https://openairdocs.org/jasc/5315/reports.md

## Other codes in chapter 53

- [JASC 5300](https://openairdocs.org/jasc/5300): Fuselage Structure (General) (8,203 reports)
- [JASC 5301](https://openairdocs.org/jasc/5301): Aerial Tow Equipment (18 reports)
- [JASC 5302](https://openairdocs.org/jasc/5302): Rotorcraft Tail Boom (965 reports)
- [JASC 5310](https://openairdocs.org/jasc/5310): Fuselage Main, Structure (38,407 reports)
- [JASC 5311](https://openairdocs.org/jasc/5311): Fuselage Main, Frame (61,504 reports)
- [JASC 5312](https://openairdocs.org/jasc/5312): Fuselage Main, Bulkhead (20,041 reports)
- [JASC 5313](https://openairdocs.org/jasc/5313): Fuselage Main, Longeron/Stringer (36,267 reports)
- [JASC 5314](https://openairdocs.org/jasc/5314): Fuselage Main, Keel (2,917 reports)
- [JASC 5320](https://openairdocs.org/jasc/5320): Fuselage Miscellaneous Structure (215,699 reports)
- [JASC 5321](https://openairdocs.org/jasc/5321): Fuselage Floor Panel (49,299 reports)
- [JASC 5322](https://openairdocs.org/jasc/5322): Fuselage Internal Mounting Structure (12,746 reports)
- [JASC 5323](https://openairdocs.org/jasc/5323): Fuselage Internal Stairs (98 reports)
- [JASC 5324](https://openairdocs.org/jasc/5324): Fuselage Fixed Partitions (40 reports)
- [JASC 5330](https://openairdocs.org/jasc/5330): Fuselage Main, Plate/Skin (79,225 reports)
- [JASC 5340](https://openairdocs.org/jasc/5340): Fuselage Main, Attach Fittings (22,382 reports)
- [JASC 5341](https://openairdocs.org/jasc/5341): Fuselage, Wing Attach Fittings (489 reports)
- [JASC 5342](https://openairdocs.org/jasc/5342): Fuselage, Stabilizer Attach Fittings (573 reports)
- [JASC 5343](https://openairdocs.org/jasc/5343): Fuselage, Landing Gear Attach Fittings (1,946 reports)
- [JASC 5344](https://openairdocs.org/jasc/5344): Fuselage, Door Hinge (2,418 reports)
- [JASC 5345](https://openairdocs.org/jasc/5345): Fuselage, Equipment Attach Fittings (813 reports)
- [JASC 5346](https://openairdocs.org/jasc/5346): Fuselage, Powerplant Attach Fittings (921 reports)
- [JASC 5347](https://openairdocs.org/jasc/5347): Fuselage, Seat/Cargo Attach Fittings (66,268 reports)
- [JASC 5350](https://openairdocs.org/jasc/5350): Aerodynamic Fairings (6,107 reports)
- [JASC 5397](https://openairdocs.org/jasc/5397): Fuselage Main, Bulkhead Fuselage wiring (67 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.