# JASC 5511: Horizontal Stabilizer, Spar/Rib

- Type: JASC system/component code (FAA)
- ATA chapter: 55 Stabilizers
- Title in the code table: HORIZONTAL STABILIZER, SPAR/RIB
- Service difficulty reports: 6,457
- FAA code table: https://www.faa.gov/sites/faa.gov/files/JASC_Code.pdf#page=50
- Page: https://openairdocs.org/jasc/5511

## What it covers

For specific reports of spars/ribs on the horizontal stabilizer.

## Service difficulty reports (6,457, newest 50)

- [SDR 2026FA0000878](https://openairdocs.org/sdr/2026FA0000878), Oct 20, 2026: Cessna 560XL. SPAR CAP. CORRODED. CORROSION FOUND ON RUDDER COVE RH SPAR CAP BELOW UPPER HINGE BRACKET. COMPLIED WITH NETJETS ERO-991706 REV.IR, DATED OCT (N685QS)
- [SDR AALA202610207275](https://openairdocs.org/sdr/AALA202610207275), Oct 17, 2026: Boeing 737823. RIB. CRACKED. AIRCRAFT IN BASE MAINTENANCE: DURING THE OKAY TO INSTALL RH HORIZONTAL STAB LE PNL #341B NOTICED 2EA CRACKS ON INTERNAL  (N929AN)
- [SDR JR2R20261012820](https://openairdocs.org/sdr/JR2R20261012820), Oct 12, 2026: Emb ERJ170200LR. RIB. CRACKED. PANEL 335AL HAS CRACKED RIB. REPLACED (N88359)
- [SDR FDEA202610121558](https://openairdocs.org/sdr/FDEA202610121558), Oct 12, 2026: Boeing 757204. FRAME. CORRODED. RH ELEVATOR CONDUCTIVE FRAME MULTIPLE ZONES WITH CORROSION (UPPER AND LOWER) EVALUATED CONDUCTIVE FRAME RH ELEVATOR UPPE (N923FD)
- [SDR AALA202610228777](https://openairdocs.org/sdr/AALA202610228777), Oct 7, 2026: Boeing 737823. RIB. CRACKED. AIRCRAFT IN BASE MAINTENANCE: NOTICED 2EA CRACKS ON INTERNAL STRUCTURE MAIN RIB STIFFENERS 1ST AND 2ND FROM FWD TO AFT L (N929AN)
- [SDR K11A2026102000403](https://openairdocs.org/sdr/K11A2026102000403), Oct 3, 2026: Boeing 737883. RIB. CORRODED. L/H HORIZONTAL STAB TRAILING EDGE RIB AT ELEV STA 146 HAS EVIDENCE OF CORROSION ON LOWER SURFACE (N325FL)
- [SDR K11A2026102000402](https://openairdocs.org/sdr/K11A2026102000402), Oct 3, 2026: Boeing 737883. RIB. CORRODED. L/H HORIZONTAL STAB TRAILING EDGE RIB AT ELEV STA 176 HAS EVIDENCE OF CORROSION IN HOLES ON LOWER SURFACE (N325FL)
- [SDR K11A2026102000401](https://openairdocs.org/sdr/K11A2026102000401), Oct 2, 2026: Boeing 737883. RIB. CORRODED. L/H HORIZONTAL STAB TRAILING EDGE RIB AT ELEV STA 121 HAS EVIDENCE OF CORROSION ON LOWER SURFACE (N325FL)
- [SDR K11A2026102000400](https://openairdocs.org/sdr/K11A2026102000400), Oct 2, 2026: Boeing 737883. RIB. CORRODED. L/H HORIZONTAL STAB TRAILING EDGE RIB AT ELEV STA 94 HAS EVIDENCE OF CORROSION ON LOWER SURFACE (N325FL)
- [SDR K11A2026101500398](https://openairdocs.org/sdr/K11A2026101500398), Oct 2, 2026: Boeing 737883. RIB. CORRODED. L/H HORIZONTAL STAB TRAILING EDGE RIB ELEV STA 66 HAS EVIDENCE OF CORROSION ON LOWER SURFACE (N325FL)
- [SDR SWAA2026102120461](https://openairdocs.org/sdr/SWAA2026102120461), Sep 23, 2026: Boeing 7378H4. RIB. CRACKED. CRACKED LT HORIZONTAL STAB LEADING EDGE RIB AT ACCESS PANEL 331B, REPLACED THE RIB & FASTENERS IAW SRM 51-40-02, & DWG 1 (N8658A)
- [SDR SWAA2026102102572](https://openairdocs.org/sdr/SWAA2026102102572), Sep 23, 2026: Boeing 7378H4. RIB. CRACKED. CRACKED LEADING EDGE RIB, L/E STA 272.62 ON THE RT HORIZONTAL STAB. REPLACED THE RIB IAW SRM 51-40-02-0G-0, SRM 51-10-02 (N8658A)
- [SDR AALA202610190329](https://openairdocs.org/sdr/AALA202610190329), Sep 16, 2026: Boeing 737823. RIB. CRACKED. AIRCRAFT IN BASE MAINTENANCE: LH HORIZONTAL STABILIZER RIB CRACKED AT LH STAB STA 101.92. CRACKED RIB REPAIR IAW SRM 55- (N811NN)
- [SDR AALA202609244705](https://openairdocs.org/sdr/AALA202609244705), Sep 15, 2026: Boeing 737823. RIB. CRACKED. AIRCRAFT IN BASE MAINTENANCE: LEFT HORIZONTAL STAB LEADING EDGE CRACKED AT UPPER EDGE OF RIB LOCATED AT LE HSS 300.51. R (N811NN)
- [SDR SWAA2026100767136](https://openairdocs.org/sdr/SWAA2026100767136), Sep 13, 2026: Boeing 7377H4. RIB. CRACKED. CRACKED LEADING EDGE RIB, HSS 114.55 OF RT HORIZONTAL STAB. REPLACED THE RIB IAW SRM 51-10-02, ITEM 9, SRM 51-40-02, AND (N208WN)
- [SDR SWAA2026101900859](https://openairdocs.org/sdr/SWAA2026101900859), Sep 3, 2026: Boeing 7378H4. RIB. CRACKED. RIGHT HORIZONTAL STAB L/E 5TH FROM INBD RIB IS CRACKED. REMOVED AND REPLACED THE NR 5 RIB IAW SRM 51-40-02-0G-0, AND DWG (N8657B)
- [SDR SWAA2026101916761](https://openairdocs.org/sdr/SWAA2026101916761), Sep 3, 2026: Boeing 7378H4. RIB. CRACKED. LEFT HORIZONTAL STAB L/E, THIRD FROM INBD RIB CRACKED. R & R THE RIB IAW SRM 51-40-02-0G-0, & DWG 186A1001, REV B. (N8657B)
- [SDR SWAA2026100888053](https://openairdocs.org/sdr/SWAA2026100888053), Sep 3, 2026: Boeing 7378H4. RIB. CRACKED. LEFT HORIZONTAL STAB L/E, 4TH FROM INBD RIB CRACKED. R & R LT HORIZONTAL STAB L/E 4TH RIB IAW SRM 51-40-02-0G-0, & DWG 1 (N8657B)
- [SDR AALA202609233863](https://openairdocs.org/sdr/AALA202609233863), Sep 3, 2026: Boeing 737823. RIB. CRACKED. AIRCRAFT IN BASE MAINTENANCE: LEFT HORIZONTAL STABILIZER - LEADING EDGE PANEL HAS A CRACKED RIB AT LE STA 291.21. REMOVE (N810NN)
- [SDR CALA2026090719252](https://openairdocs.org/sdr/CALA2026090719252), Sep 3, 2026: Boeing 737824. SPAR. CRACKED. RIGHT HORIZONTAL STABILIZER FRONT SPAR O/B FIXED WEB HAS A CRACK ON INSPECTION HOLE. REPAIR ACCOMPLISHED IAW ESR-WI 10-1 (N78509)
- [SDR CALA2026090419238](https://openairdocs.org/sdr/CALA2026090419238), Sep 3, 2026: Boeing 737924ER. RIB. CRACKED. CRACK FOUND AT RIGHT HORIZONTAL STABILIZER RIB STA 120.30 LOWER FLANGE O/B ROW AT STIFFENER NR 3, CRACK DIRECTION 9 O'CL (N39415)
- [SDR CALA2026090319210](https://openairdocs.org/sdr/CALA2026090319210), Sep 2, 2026: Boeing 737924ER. RIB. CRACKED. CRACK FOUND ON LT HORIZONTAL STAB RIB HSS 138.70, LOWER FLANGE INBD ROW AT STIFFENER NR 3, CRACK DIRECTION 11 O'CLOCK. C (N39415)
- [SDR CALA2026090219204](https://openairdocs.org/sdr/CALA2026090219204), Sep 2, 2026: Boeing 737924ER. RIB. CRACKED. FOUR CRACKS AT FASTENER HOLES FOUND ON LT HORIZONTAL STAB RIB HSS 147.90, LOWER FLANGE, ONE AT INBD ROW & THREE AT OTBD  (N39415)
- [SDR DALA2026090204948](https://openairdocs.org/sdr/DALA2026090204948), Sep 1, 2026: Boeing 717200. SPAR CAP. CORRODED. FOUND CORROSION IN BARREL NUT HOLE AFFECTING THE FRONT SPAR UPPER CAP BARREL NUT HOLE NR 27 OF THE RT HORIZONTAL STAB, C (N979AT)
- [SDR CALA2026090219188](https://openairdocs.org/sdr/CALA2026090219188), Sep 1, 2026: Boeing 737924ER. RIB. CRACKED. CRACK FOUND AT RT HORIZONTAL STAB RIB HSS 138.70 LOWER FLANGE INBD ROW AT STIFFENER NR 3, CRACK DIRECTION 9 O'CLOCK. ACC (N39415)
- [SDR SWAA2026091463270](https://openairdocs.org/sdr/SWAA2026091463270), Aug 22, 2026: Boeing 7377H4. RIB. CRACKED. CRACKED LEADING EDGE RIB ACCESS PANEL 331B LE HSS 114.55 AT LT HORIZONTAL STAB. REPLACED LEADING EDGE RIB & FASTENERS ON (N207WN)
- [SDR SWAA2026091430002](https://openairdocs.org/sdr/SWAA2026091430002), Aug 22, 2026: Boeing 7377H4. RIB. CRACKED. CRACK LEADING EDGE RIB ACCESS PANEL 331B LE STA 86.66 AT LT HORIZONTAL STAB. REPLACED LEADING EDGE RIB AND FASTENERS ON  (N207WN)
- [SDR SWAA2026090753324](https://openairdocs.org/sdr/SWAA2026090753324), Aug 18, 2026: Boeing 7377H4. RIB. CRACKED. LEFT HORIZONTAL STAB RIB NR 4, 2ND STIFFENER FROM FWD, CRACKED. RIB REPAIRED IAW SRM 55-10-09-2R-4-A01101. (N489WN)
- [SDR SIMA20260817003](https://openairdocs.org/sdr/SIMA20260817003), Aug 17, 2026: Emb ERJ170100SU. SPAR. BENT. SSI # 55-10-017 RH HORIZONTAL STAB LOWER LEADING EDGE ATTACHMENT FLANGE BENT BETWEEN RIB 10 AND RIB11. (MAJOR REPAIR). P (N782SM)
- [SDR CALA2026081418619](https://openairdocs.org/sdr/CALA2026081418619), Aug 13, 2026: Boeing 737824. RIB. CRACKED. RIGHT HORIZONTAL STAB L/E RIB AT HSS 281 AFT SECTION HAD EVIDENCE OF A CRACK. REMOVED AND REPLACED RT HORIZONTAL STAB L/ (N33292)
- [SDR CALA2026081418617](https://openairdocs.org/sdr/CALA2026081418617), Aug 13, 2026: Boeing 737824. RIB. CRACKED. LEFT HORIZONTAL STAB. LEADING EDGE INTERNAL RIB AT HSS 95 HAD EVIDENCE OF A CRACK. REMOVED AND REPLACED LT HORIZONTAL ST (N33292)
- [SDR CALA2026081418603](https://openairdocs.org/sdr/CALA2026081418603), Aug 13, 2026: Boeing 737824. RIB. CRACKED. RIGHT HORIZONTAL STAB L/E RIB AT HSS 253.73 AFT SECTION EVIDENCE OF CRACK. REMOVED AND REPLACED RIGHT HORIZONTAL STAB L/ (N33292)
- [SDR CALA2026081418601](https://openairdocs.org/sdr/CALA2026081418601), Aug 13, 2026: Boeing 737824. RIB. CRACKED. RIGHT HORIZONTAL STAB L/E RIB AT STA 235 AFT SECTION EVIDENCE OF CRACK. REMOVED AND REPLACED RIGHT HORIZONTAL STAB L/E R (N33292)
- [SDR CALA2026081418599](https://openairdocs.org/sdr/CALA2026081418599), Aug 13, 2026: Boeing 737824. RIB. CRACKED. RIGHT HORIZONTAL STAB L/E RIB AT STA 263.3 AFT SECTION EVIDENCE OF CRACK. REMOVED AND REPLACED RIGHT HORIZONTAL STAB L/E (N33292)
- [SDR 2A6D20260813002](https://openairdocs.org/sdr/2A6D20260813002), Aug 13, 2026: Urocop EC130T2. RIB. CHAFED. CHAFE DAMAGE ON BL 1263 RIB ON RH SIDE OF HORIZONTAL STABILIZER. (N741AC)
- [SDR CALA2026081418593](https://openairdocs.org/sdr/CALA2026081418593), Aug 12, 2026: Boeing 737824. RIB. CRACKED. RIGHT HORIZONTAL STAB L/E RIB AT STA 96 AFT SECTION EVIDENCE OF CRACK. REMOVED AND REPLACED RT HORIZONTAL STAB L/E RIB A (N33292)
- [SDR CALA2026081418591](https://openairdocs.org/sdr/CALA2026081418591), Aug 12, 2026: Boeing 737824. RIB. CRACKED. RIGHT HORIZONTAL STAB L/E RIB AT HSS 244.73 AFT SECTION EVIDENCE OF A CRACK. R & R RT HORIZONTAL STAB L/E RIB IAW SRM 51 (N33292)
- [SDR SWAA2026090303631](https://openairdocs.org/sdr/SWAA2026090303631), Aug 10, 2026: Boeing 7377H4. RIB. NO DISCREPANCY. CRACKED RIB, LE STA 254.02, ACCESS 331B ON HORIZONTAL STAB. REMOVED PRIMER UPPER FASTENER ADJACENT AREA RIB IAW AMM 51-2 (N954WN)
- [SDR SWAA2026090378908](https://openairdocs.org/sdr/SWAA2026090378908), Aug 7, 2026: Boeing 7377H4. RIB. CRACKED. CRACKED LEADING EDGE RIB, ACCESS PANEL 331B, LE HSS 105.26. REPLACED LEADING EDGE RIB IAW SRM 51-10-02 AND FASTENER INST (N954WN)
- [SDR SWAA2026090345661](https://openairdocs.org/sdr/SWAA2026090345661), Aug 6, 2026: Boeing 7377H4. RIB. CRACKED. CRACKED INSPAR RIB, HSS 129.50 AND 27 INCHES FROM FRONT SPAR. REPAIRED THE INSPAR RIB IAW SRM 55-10-09-2R-4, REPAIR 4. (N954WN)
- [SDR AALA202608104175](https://openairdocs.org/sdr/AALA202608104175), Aug 4, 2026: Boeing 737823. RIB. CRACKED. AIRCRAFT IN BASE MAINTENANCE: LH HOR. STAB. LE PANEL 331B HAS A CRACKED RIB/ 4TH RIB FROM BOTTOM UP. MAINTENANCE REMOVED (N352PS)
- [SDR ASAA2026073068647](https://openairdocs.org/sdr/ASAA2026073068647), Jul 30, 2026: Boeing 737890. SPAR. CORRODED. LEFT HORIZONTAL STAB, I/B OF AFT SPAR, LOWER CORD ATTACHMENT FITTING AFT FACE HAS A LARGE AREA OF EXFOILIATINIG CORROSIO (N569AS)
- [SDR AALA202608142714](https://openairdocs.org/sdr/AALA202608142714), Jul 26, 2026: Boeing 737823. RIB. CRACKED. AIRCRAFT IN BASE MAINTENANCE: LH HORIZONTAL STABILIZER - LEADING EDGE PANEL HAS CRACKED RIB AT LE STA 95.96 REMOVED AND  (N809NN)
- [SDR AALA202608142006](https://openairdocs.org/sdr/AALA202608142006), Jul 26, 2026: Boeing 737823. RIB. CRACKED. AIRCRAFT IN BASE MAINTENANCE: LH HORIZONTAL STABILIZER - LEADING EDGE PANEL HAS CRACKED RIB AT LE STA 78.29 REMOVED AND  (N809NN)
- [SDR AALA202608143938](https://openairdocs.org/sdr/AALA202608143938), Jul 26, 2026: Boeing 737823. RIB. CRACKED. AIRCRAFT IN BASE MAINTENANCE: LH HORIZONTAL STABILIZER - LEADING EDGE PANEL HAS CRACKED RIB AT LE STA 114.55. REMOVED AN (N809NN)
- [SDR AALA202608143897](https://openairdocs.org/sdr/AALA202608143897), Jul 26, 2026: Boeing 737823. RIB. CRACKED. AIRCRAFT IN BASE MAINTENANCE: LH HORIZONTAL STABILIZER - LEADING EDGE PANEL HAS CRACKED RIB AT LE STA 151.75 REPLACED CR (N809NN)
- [SDR CALA2026072718055](https://openairdocs.org/sdr/CALA2026072718055), Jul 25, 2026: Boeing 737824. RIB. CRACKED. CRACK AT LEFT HORIZONTAL STAB RIB BS 92.70, STIFFENER NR 3. PERFORMED SRM 55-10-09-2R-4 RIB REPAIR AT LEFT HORIZONTAL ST (N39297)
- [SDR SWAA2026090208490](https://openairdocs.org/sdr/SWAA2026090208490), Jul 24, 2026: Boeing 7378H4. RIB. CRACKED. CRACKED LEADING EDGE RIB ACCESS PANEL 331B, LE STA 151.75 AT LT HORIZONTAL STAB. REPLACED THE RIB IAW SRM 51-40-05, & DW (N8648A)
- [SDR SWAA2026081772706](https://openairdocs.org/sdr/SWAA2026081772706), Jul 24, 2026: Boeing 7377H4. RIB. CRACKED. CRACKED LEADING EDGE RIB ACCESS PANEL 331B, HSS 95.96, LT HORIZONTAL STAB. REPLACED RIB IAW SRM 51-10-02, ITEM 9, DWG 18 (N952WN)
- [SDR ASAA2026071968333](https://openairdocs.org/sdr/ASAA2026071968333), Jul 19, 2026: Boeing 737890. RIB. CRACKED. LEFT HORIZONTAL STAB AT APPROX BS 129.50, ABOVE EXSTING LOWER SKIN REPAIR, INSPAR RIB 182A5305 HAS A CRACK. GROUNDED - Y (N566AS)

All 6,457: https://openairdocs.org/jasc/5511/reports.md

## Other codes in chapter 55

- [JASC 5500](https://openairdocs.org/jasc/5500): Empennage Structure (490 reports)
- [JASC 5510](https://openairdocs.org/jasc/5510): Horizontal Stabilizer Structure (5,958 reports)
- [JASC 5512](https://openairdocs.org/jasc/5512): Horizontal Stabilizer, Plate/Skin (7,882 reports)
- [JASC 5513](https://openairdocs.org/jasc/5513): Horizontal Stabilizer, Tab Structure (97 reports)
- [JASC 5514](https://openairdocs.org/jasc/5514): Horizontal Stabilizer Miscellaneous Structure (2,781 reports)
- [JASC 5520](https://openairdocs.org/jasc/5520): Elevator Structure (5,383 reports)
- [JASC 5521](https://openairdocs.org/jasc/5521): Elevator, Spar/Rib (520 reports)
- [JASC 5522](https://openairdocs.org/jasc/5522): Elevator, Plate/Skin (3,271 reports)
- [JASC 5523](https://openairdocs.org/jasc/5523): Elevator, Tab Structure (1,033 reports)
- [JASC 5524](https://openairdocs.org/jasc/5524): Elevator Miscellaneous Structure (322 reports)
- [JASC 5530](https://openairdocs.org/jasc/5530): Vertical Stabilizer (2,534 reports)
- [JASC 5531](https://openairdocs.org/jasc/5531): Vertical Stabilizer, Spar/Rib (1,233 reports)
- [JASC 5532](https://openairdocs.org/jasc/5532): Vertical Stabilizer, Plate/Skin (1,747 reports)
- [JASC 5533](https://openairdocs.org/jasc/5533): Ventral Structure (77 reports)
- [JASC 5534](https://openairdocs.org/jasc/5534): Vertical Stabilizer Miscellaneous Structure (816 reports)
- [JASC 5540](https://openairdocs.org/jasc/5540): Rudder Structure (1,901 reports)
- [JASC 5541](https://openairdocs.org/jasc/5541): Rudder, Spar/Rib (277 reports)
- [JASC 5542](https://openairdocs.org/jasc/5542): Rudder, Plate/Skin (1,372 reports)
- [JASC 5543](https://openairdocs.org/jasc/5543): Rudder, Tab Structure (196 reports)
- [JASC 5544](https://openairdocs.org/jasc/5544): Rudder Miscellaneous Structure (270 reports)
- [JASC 5550](https://openairdocs.org/jasc/5550): Empennage Flight Control Surfaces, Attach Fittings (66 reports)
- [JASC 5551](https://openairdocs.org/jasc/5551): Horizontal Stabilizer, Attach Fittings (672 reports)
- [JASC 5552](https://openairdocs.org/jasc/5552): Elevator Tab, Attach Fittings (222 reports)
- [JASC 5553](https://openairdocs.org/jasc/5553): Vertical Stabilizer, Attach Fittings (586 reports)
- [JASC 5554](https://openairdocs.org/jasc/5554): Rudder/Tab, Attach Fittings (132 reports)
- [JASC 5597](https://openairdocs.org/jasc/5597): Stabilizer System Wiring (14 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.