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SDR ASAA2025083060956

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Service difficulty report · Floor Support · Boeing 737990ER

FAA SDR system

Difficulty date
August 30, 2025
Submitted
September 19, 2025
Operation
Air carrier
Aircraft
N471AS
Make and model
Boeing 737990ER
Aircraft serial
41703
Aircraft time
40,738 hours, 12,607 cycles
System (JASC)
5320 · Fuselage Miscellaneous Structure
Part
Floor Support
Part number
141A5769U14
Condition
Corroded
Location
Zone 200
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

IN FWD GALLEY, 5 INCHES FWD OF STA 312, LBL 12, EVIDENCE OF CORROSION ON FLOOR STRUCTURE (MARKED IN RED) GROUNDED - YES. BLENDED AREA, ORIGINAL THICKNESS .180", MATERIAL REMOVED .069", REMAINING THICKNESS .111", FOUND TO BE OUT OF LIMITS IAW B737-900ER 53-10-51. REMOVED AND REPLACED INTERCOSTAL IAW B737-900ER SRM 51-40-02 AND BAC DWG 141A5400 REV.-.