SDR SWAA2020051829201

Service difficulty report · Threshold · Boeing 7378H4

Difficulty date: January 25, 2020
Submitted: May 18, 2020
Operation: Air carrier
Aircraft: N8603F
Make and model: Boeing 7378H4
Aircraft serial: 38875
Aircraft time: 27,506 hours, 11,825 cycles
System (JASC): 5320 · Fuselage Miscellaneous Structure
Part: Threshold
Condition: Corroded
Location: Fuselage
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; CARGO DOOR CUTOUT SURROUND STRUCTURE; AT APPROXIMATELY WL 157; RBL 25; STA 794 - STA 847; THRESHOLD WEB HAS AREAS OF CORROSION ACROSS LENGTH OF UPPER SURFACE. / BLENDED CORROSION OF THHRESHOLD WEB WL 157; RBL 25 STA 794-STA847 WITH 100% MATERIAL OUT OF LIMITS IAW B737 SRM 53-60-15-1A-1. REMOVED AND REPLACED THRESHOLD WEB IAW BOEING DWG 146A8340 REV:A AND B737 SRM 51-40-02-0G-0 ' 'P/N 146A8123-25

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