# SDR SWAA2022042590005
- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 31, 2022
- Submitted: April 25, 2022
- Operation: Air carrier
- Aircraft: N769SW
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 30588
- Aircraft time: 74,146 hours, 43,614 cycles
- System (JASC): [5320 · Fuselage Miscellaneous Structure](https://openairdocs.org/jasc/5320)
- Part: Web
- Condition: Corroded
- Location: Fwd Cargo Bay
- 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/SWAA2022042590005
## Discrepancy
CORROSION ON FWD CARGO BAY SUB THRESHOLD WEB AT STA 440+14 TO STA 460+19; WL 156; RBL 28 TO RBL 29. / [01] REMOVED CORROSION AT
STA 440+14 0.003'
STA 440+15 0.001'
STA 440+16 0.002'
STA 460 0.006'
STA 460+3 0.002'
STA 460+5 0.002'
STA 460+5 0.001'
STA 460+6 0.001'
STA 460+9 0.002'
STA 460+13 0.003'
STA 460+17 0.002'
STA 460=18 0.002'
ORIGINAL MATERIAL THICKNESS : 0.045'; REMAINING MATERIAL THICKNESS : 0.039' AT STA 460.
DAMAGE EXCEED MAX ALLOWABLE DAMAGE.
FOUND TO BE OUT OF LIMIT
CALIBRATION TOOL DEPTH GAUGE
ID : ATS1225
S/N : UNKNOWN
DUE : 07/2022;[02] REMOVED CORROSION AT
STA 440+14 0.003'
STA 440+15 0.001'
STA 440+16 0.002'
STA 460 0.006'
STA 460+3 0.002'
STA 460+5 0.002'
STA 460+5 0.001'
STA 460+6 0.001'
STA 460+9 0.002'
STA 460+13 0.003'
STA 460+17 0.002'
STA 460=18 0.002'
ORIGINAL MATERIAL THICKNESS : 0.045'; REMAINING MATERIAL THICKNESS : 0.039' AT STA 460.
DAMAGE EXCEED MAX ALLOWABLE DAMAGE.
FOUND TO BE OUT OF LIMIT IAW SRM 53-30-15-1A-1
CALIBRATION TOOL DEPTH GAUGE
ID : ATS1225
S/N : UNKNOWN
DUE : 07/2022;[03] VERIFIED ACTION 1;2;[04] LOCATED; DRILLED; AND COUNTERSUNK REPLACEMENT WEB PER SRM 51-40-05-0G-0; SRM 51-40-08-0G-0; AND DWG 143A8330; SHT 21. APPLIED CHEMICAL CONVERSION COATING PER AMM 51-21-41-370-802. INSTALLED NUT PLATES PER SRM 51-40-02-0G-0 AND DWG 143A8300; SHT 21.
---
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.