Service difficulty report · Floor Panel · Boeing 7377H4

Difficulty date
April 8, 2023
Submitted
May 18, 2023
Operation
Air carrier
Aircraft
N958WN
Make and model
Boeing 7377H4
Aircraft serial
36673
Aircraft time
38,993 hours, 23,664 cycles
Part
Floor Panel
Condition
Pulled
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

FWD PANEL 221EF UPPER FACESHEET HAS MULTIPLE AREAS OF PULLED STRANDS.<EXCEEDS THE ALLOWABLE LIMITS AS GIVEN IN SRM 53-00-50-1A-1 PARA 4 F.REMOVED 32EA THROUGH INSERTS THEN PERFORMED DAMAGE REMOVAL & SURFACE PREPARATION STEPS USING BMS5-28 TYPE 19 POTTING COMPOUND LOT AK21P3152K-1 FILLED THE EXPOSED HONEYCOMB CORE CELLS & SET TO CURE IAW SRM 53-00-50-2R-1 PARA 3. STEP G .;[06] CURED THE POTTING COMPOUND AT THE EXPOSED CORE CELLS; SANDED THEN FABRICATED REPAIR PLIES. IAW SRM 53-00-50-2R-1 PARA 3 STEP K OK TO LAY UP THE REPAIR;[07] LINE 6 CORRECTION: SHOULD READ SANDED THEN PREPARED THE SURFACE IAW SRM 53-00-50-2R-1 .;[08] INSPECTED AND VERIFIED CORRECTIVE ACTIONS 5; 6 AND 7. OKAY TO INSTALL REPAIR PLIES.;[09] INSTALLED REPAIR PLIES USING BMS 8-201TY4 LOT#1523449-1; VACUUM BAGGED; LEAK CHECK GOOD WITH VACUUM GAUGE ID:E11543 CAL DUE 09/2023 IAW SRM 53-00-50-2R-1 PARA 3.K(1)-L(1).;[10] INSPECTED AND VERIFIED CORRECTIVE ACTION 9.;[11] CURED REPAIR PLIES WITH THERMOMETER ID:ATS2208 CAL DUE 10/2023 AND UNBAGGED IAW SRM 53-00-50-2R-1 PARA 3.M(1).;[12] SANDED EDGES AND DRILLED HOLES FOR INSERTS IAW SRM 53-00-50-2R-1 PARAGRAPH 3. N. AND BOEING DWG 144A5810 SHEET 249.;[13] CORRECTION TO ITEM 12: SHOULD READ 'AND BOEING DWG 141A5810'.<BR><BR>INSTALLED ALL INSERTS USING BMS 5-107 LOT#AK2KP8383K-1 IAW SRM 53-00-50-2R-1 PARA 3.N AND BOEING DWG 141A5810 SHEET 249<BR>USED THERMOMETER ID:ATS2208 CAL DUE 10/2023;

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