SDR CALA2018032100964

Service difficulty report · Floor Support · Boeing 757222

Difficulty date: March 20, 2018
Submitted: March 21, 2018
Operation: Air carrier
Aircraft: N568UA
Make and model: Boeing 757222
Aircraft serial: 26674
Aircraft time: 81,729 hours, 27,521 cycles
System (JASC): 5320 · Fuselage Miscellaneous Structure
Part: Floor Support
Part number: 143N54101
Condition: Corroded
Location: Bs 720-740
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

ON REMOVAL OF MAIN CABIN FLOOR BOX BEAM, DISCOVERED CORROISON ON THE ATTACHED SUPPORT CHANNEL BETWEEN BS 720 - 740, RBL 60 UPPER SURFACE. BLENDED THE CORROSION AND FOUND TO BE OUT OF LIMITS IAW SRM 53-30-15, FIG 101, DETAIL IV, ALLOWABLE DAMAGE I. REPLACED THE SUPPORT CHANNEL IAW SRM 51-40-02, AND DWG 143N5410.