Service difficulty report · Beam · Boeing 7378H4

Difficulty date
February 23, 2023
Submitted
March 21, 2023
Operation
Air carrier
Aircraft
N8528Q
Make and model
Boeing 7378H4
Aircraft serial
36927
Aircraft time
19,732 hours, 9,567 cycles
Part
Beam
Condition
Corroded
Location
Zn 200 Fus Top
Stage of operation
IN
How discovered
9
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

CORROSION ON 947 FLOORBEAM UPPER SURFACE LBL 50; WL 208.<REMOVED CORROSION ON 947 FLOORBEAM UPPER SURFACE LBL 50; WL 208 PER SRM 51-10-02-0G-0. AREA BLENDED IS 3' BY .600'; .050' ON EDGE PER SRM 51-10-02-0G-0.;[04] REJECTED CORRECTIVE ACTIONS STEP 3; CREATED STEP 1 FOR CORROSION REMAINING.;[05] COMPLETED STEP 1;[06] REQUEST NDI FOR REMAINING THICKNESS;[07] REQUEST HFEC FOR CRACK FREE CONDITION;[08] COMPLETED STEP 1;[09] ACCOMPLISHED HFEC SURFACE SCAN IAW 737 NDTM PART 6 CHAPTER 51-00-00 PROCEDURE 23. NO CRACKS NOTED.<BR><BR>ACCOMPLISHED HFEC OPEN HOLE INSPECTION IAW 737 NDTM PART 6 CHAPTER 51-00-00 PROCEDURE 16. NO CRACKS NOTED.<BR><BR>ACCOMPLISHED UT THICKNESS MEASUREMENT IAW 737 NDTM PART 4 CHAPTER 51-00-00 PROCEDURE 2.<BR>MINIMUM REMAINING THICKNESS FOUND 0.073' ADJACENT TO 0.080'REPAIRED CORROSION ON BS947 FLOORBEAM UPPER FLANGE FROM LBL58.6-RBL58.60 I.A.W SRM 53-70-51-2R-5 REP. 5 ALT.1. COMPLETED REPAIR ON BS947 FLOORBEAM UPPER FLANGE FROM LBL58.6-RBL58.60 I.A.W SRM 53-70-51-2R-5 REP. 5 ALT.1. FLOOR BEAM FLANGE FOUND TO BE OUT OF LIMITS PER THE DIMENSIONS PROVIDED IN STEP 3. AREA BLENDED IS 3' BY .600'; .050' ON EDGE PER SRM 51-10-02-0G-0.

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