Service difficulty report · Support Angle · Boeing 7377H4

Difficulty date
April 10, 2023
Submitted
May 17, 2023
Operation
Air carrier
Aircraft
N958WN
Make and model
Boeing 7377H4
Aircraft serial
36673
Aircraft time
38,993 hours, 23,664 cycles
Part
Support Angle
Condition
Corroded
Location
Zn 100 Fus Lower
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

R/H FLOOR TO SIDEWALL SUPPORT ANGLE CORROSION; BS500A +2; 6; 10; BS500B+10; +14; BS500C +7; +10; RBL24; WL156<[01] VERIFIED APPLICABILITY IAW SRM 53-30-53-01-2 AND SRM 53-00-53-1A-2;[02] REMOVED CORRSION AT<BR><BR>BS 500A+2 0.005'(OUT OF LIMIT) - THE DEEPEST DAMAGE<BR>BS 500A+6 0.002'(WITHIN LIMIT)<BR>BS 500A+10 0.004'(WITHIN LIMIT)<BR>BS 500B+10 0.003'(WITHIN LIMIT)<BR>BS 500B+14 0.001'(WITHIN LIMIT)<BR>BS 500C+7 0.005'(OUT OF LIMIT) - THE DEEPEST DAMAGE<BR>BS 500C+10 0.002'(WITHIN LIMIT)<BR><BR>ORIGINAL MATERIAL THICKNESS : 0.040' DEEPEST DAMAGE REMOVED : 0.005' REMAINING THICKNESS : 0.035' DAMAGE EXCEED 10% OF ORIGINAL THICKNESS AT BS 500A+2 AND BS 500C+7. FOUND TO BE OUT OF LIMIT IAW SRM 53-00-53-1A-2<BR><BR>CALIBRATION TOOL DEPTH GAUGE<BR>ID : ATS2678<BR>DUE : 02/29/24;[03] VERIFIED CORRECTION ITEM1 AND 2.;[04] FABRICATED REPLACMENT FLOOR TO SIDEWALL SUPPORT BS500A-500D RBL 24 PER SRM 51-40-05-0G-0; SRM 51-40-08-0G-0 AND DWG 143A7501 OUT OF BAC1496-444#7075T62 LOT#1520195-1<BR><BR>OKAY TO APPLY CHEMICAL CONVERSION COATING AND PRIMER;[05] VERIFIED CORRECTIVE ACTIONS STEP 4; OKAY TO APPLY CHEMICAL CONVERSION COATING AND PRIMER GIVEN.;[06] APPLIED CHEMICAL CONVERSION COATING AND PRIMER PER AMM 51-21-41-370-802 AND AMM 51-21-72-370-804;[07] VERIFIED CORRECTIVE ACTIONS STEP 6.;[08] INSTALLED CLICKBOND NUTPLATES IAW SRM 51-40-10-2R-0 AND DWG. 143A7501-186.;[09] VERIFIED CORRECTIVE ACTION 8 AND MEASUREMENT TABLE

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