Service difficulty report · Beam · Boeing 7377H4

Difficulty date
January 26, 2023
Submitted
March 6, 2023
Operation
Air carrier
Aircraft
N955WN
Make and model
Boeing 7377H4
Aircraft serial
36671
Aircraft time
38,739 hours, 23,607 cycles
Part
Beam
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

CORROSION ON 986 FLOOR BEAM AT LBL 42<[01] UPDATED MEASUREMENT TABLE;[02] VARIFIED APPLICABILITY OF SRM 53-70-51-1A-1 LIMITS;[03] BLENDED FLOOR BEAM AT 986 LBL42 WL 208 IN A 1'X.8' REMOVING .048 ORIGINAL THICKNESS .150 FOUND TO BE OUT OF LIMITS PER SRM 53070-51-1A-1 STEP 4-H 2;B;[04] CUT OUT DAMAGE AT BS 986 LBL42 WL 208 IN A 1.1X.9' PER SRM 53-70-51-2R-6 STEP 4 FIG 205[12] FABRICATED RE PAIR PARTS -1 STRAP .100 7075-T6 LOT # 1489800-1; -2 ANGLE BAC1490-2887 7075-T6 LOT # 1375978-1; -3 FILLER .150 BAC1505-101474 7075-T7 LOT # 1505572-1 ; APPLIED CHEMICAL CONVERSION COATING PER SRM 53-70-51-2R-6 STEP 4-F TABLE 204 AND FIGURE 205 OK TO PRIME;[13] VERIFIED CORRECTIVE ACTION #12;[14] OK TO PRIME GIVEN;[15] APPLIED PRIMER TO REPAIR PARTS PER SRM 53-70-51-2R-6 STEP 4-CL ;OK TO INSTALL;[16] VERIFIED CORRECTIVE ACTION 15. OK TO INSTALL GIVEN;[17] INSTALLED REPAIR PARTS ON 986 FLOOR BEAM AT LBL42 PER SRM 53-70-51-2R-6 STEP 4 M-O;

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