# SDR SWAA2021112227332

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 6, 2021
- Submitted: November 22, 2021
- Operation: Air carrier
- Aircraft: N450WN
- Make and model: Boeing 737*
- Aircraft serial: 32470
- Aircraft time: 58,641 hours, 34,716 cycles
- System (JASC): [5320 · Fuselage Miscellaneous Structure](https://openairdocs.org/jasc/5320)
- Part: None
- Condition: Corroded
- Stage of operation: IN
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SWAA2021112227332

## Discrepancy

CORROSION ON BS 986 BEAM UPPER CHORD BS 986 RBL 39-44 WL208 ; / [01] REMOVED CORROSION ON BS 986 BEAM UPPER CHORD BS 986 RBL 39-44 WL 208 IN AREA OF 1' BY 5' BY A MAXIMUM OF 0.057' PER SRM 51-10-02-0G-0 AND SRM 53-70-51-1A-1. OUT OF LIMITS PER SRM 53-70-51-1A-1.; [02] REMOVED CORROSION ON BS 986 BEAM UPPER CHORD BS 986 RBL 39-44 WL 208 IN AREA OF 1' BY 5' BY A MAXIMUM OF 0.057' PER SRM 51-10-02-0G-0 AND SRM 53-70-51-1A-1. OUT OF LIMITS PER SRM 53-70-51-1A-1. USED DIAL DEPTH GAUGE ID: NCX000697 S/N: UNKNOWN TRIMMED INTERCOSTAL I.A.W SRM 53-70-51-2R-4 STEP 4.F(3) REQUEST D.V.I; [25] FLAP PEENED THE CUT EDGE OF THE INTERCOSTAL I.A.W SRM 53-70-51-2R-4 STEP 4.F(5); [26] LOCATED AND DRILLED ITEM 8 CORNER FITTINGS(2EA) I.A.W SRM 53-70-51-2R-4 STEP 4.G-M FIGURE 207 SHEET 1-5; [27] OK TO INSTALL INTERCOSTAL.; [28] INSTALLED REPAIR PARTS BS986 RBL18-RBL50 ITEM 1 T-CHORD(1EA);ITEM 2 ANGLE(2EA);ITEM 3 ANGLE(2EA);ITEM 4 STRAP(2EA) ITEM 7 SHEAR TIE (1EA) I.A.W SRM 53-70-51-2R-4 REPAIR 4 ALTERNATIVE 2 PAR 4.N-O EXCEPT WHERE THE FASTENER ARE COMMON TO INTERCOSTAL ON RBL38. CORNER FITTINGS AND INTERCOSTAL BS 986-

---
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, except the copies of manufacturers’ service documents, which belong to their rights holders.