SDR ASAA2016041916617

Service difficulty report · Web · Boeing 737990

Difficulty date: April 19, 2016
Submitted: May 6, 2016
Operation: Air carrier
Aircraft: N309AS
Make and model: Boeing 737990
Aircraft serial: 30857
Aircraft time: 53,241 hours, 20,696 cycles
System (JASC): 5320 · Fuselage Miscellaneous Structure
Part: Web
Part number: 146A81236
Condition: Corroded
Location: Bs 794-847
Stage of operation: IN
How discovered: V
Nature of condition: O
Precautionary procedure: K

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

AFT CARGO COMPARTMENT, LOWER MAIN SILL WEB IS CORRODED. ACFT GROUNDED. REMOVED CORROSION FROM AFT CARGO LOWR SILL WEB ORIGINAL THICKNESS .045" IAW DWG 146A8123, REV F. MATERIAL LOSS .005", REMAINING THICK .040" FOUND TO BE OUT OF LIMITS IAW SRM 53-60-15-1A-1 FIG 103. TOOL T8225V. R & R WEB IAW SRM 51-10-02, PARA 9, 51-40-02, AND BAC 146A8340, REV B.