Service difficulty report · Floor Panel · Boeing 7377H4

Difficulty date
April 28, 2023
Submitted
June 1, 2023
Operation
Air carrier
Aircraft
N961WN
Make and model
Boeing 7377H4
Aircraft serial
36962
Aircraft time
37,902 hours, 23,158 cycles
Part
Floor Panel
Condition
Cracked
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

FWD FLOOR PANEL 221BF O/B TANG IS CRACKED.<[01] IDENTIFIED PANEL 221BF IAW SRM 53-00-50-0I-1 FIG 2; TABLE 2 FOUND CRACKE ALONG BOTH UPPER AND LOWER SKINS OF TANG TO BE BEYOND ALLOWABLE LIMITS IAW SRM 53-00-50-1A-1 PARA 4. F.<BR><BR>COMPLETELY REMOVED TANG; PREPED AREA AND CLEANED IAW SRM 53-00-50-2R-6 PARA 3. A. AND 3.C. - 3. E. WITH NO WATER OR CONTAMINATION NOTED.<BR><BR>REPAIR TO BE ACCOMPLISHED IAW SRM 53-00-50-2R-6.<BR><BR>OK TO INSTALL AND POT CORE FOR NEW TANG.[03] FABRICATED REPAIR PLIES AND CORE PLUG FROM REPAIR FABRIC BMS 9-3 TY H2 ST 1581 LOT#1522395-2 AND CORE BMS 8-124 TY5 GR5 CL4 LOT# 1283769 IAW SRM 53-00-50-2R-6 PARA 3. F.- G. (1) (A).;06] INSTALLED CORE PLUG TO REPAIR AREA USING BMS5-28 TY19 LOT# AK2LP8414K AND INSTALLED UPPER SURFACE PLIES USING BMS8-201 TY IV EPOCAST 50-A (946) LOT# 1526722-1; SET UP VACUUM BAG SYSTEM WITH BLEED DOWN TEST CHECKED GOOD AND NO LEAKS USING GAUGE ID: ATS2798 CAL/DUE: 10/2023 IAW SRM 53-00-50-2R-6 PAR. 3. G. (1) (B) & 3. G. (1) (C) & 3. H. (1)[10] FABRICATED LOWER SURFACE REPAIR PLIES FROM BMS9-3H2ST1581 LOT#1522395-2; OK TO INSTALL IAW SRM 53-00-50-2R-6 PARA 3K(1).[12] INSTALLED REPAIR PLIES USING BMS8-201 TYPE 4 LOT#1526722-1; VACUUM BAGGED; CHECKED FOR LEAKS; LEAK CHECKED GOOD USING VACUUM GAUGE ATS2441 CAL DUE DATE 08/2023 AND SET FOR CURE USING HEAT LAMP AND THERMOMETER ATS2208 CAL DUE DATE 10/2023 IAW SRM 53-00-50-2R-6 PARA 3K(1)-L(1)-M(1).

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