Service difficulty report · Floorbeam · Boeing 7377H4

Difficulty date
March 10, 2022
Submitted
April 11, 2022
Operation
Air carrier
Aircraft
N468WN
Make and model
Boeing 7377H4
Aircraft serial
33858
Aircraft time
58,378 hours, 34,580 cycles
Part
Floorbeam
Condition
Corroded
Location
Fuselage
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 FLOORBEAM UPPER FLANGE RBL 4-RBL 45; WL 208. / [01] VERIFY APPLICABILITY PER SRM 53-70-51-1A-1 ALLOWABLE DAMAGE 1;[02] EVALUATED DAMAGE ON BS986 FLOOR BEAM AND FOUND TO BE OUT LIMITS AT RBL4 WL208 1.5'X1.5' ORIG. MAT. THICKNESS IS 0.150' REMAINING MAT.THICKNESS IS 0.090' AND AT RBL45 WL208 1.5'X1.5' ORIG. MAT. THICKNESS IS 0.150' REMAINING MAT. THICKNESS IS 0.450' DAMAGE REMOVED I.A.W SRM 51-10-02-0G-0 AND SRM 53-70-51-1A-1 ALLOWABLE DAMAGE 1 PAR.4.D(2)(A) FIG. 103/ALLOWABLE DAMAGE 1 DETAIL E DIAL DEPTH GAUGE ID ATS400 S/N UNKNOWN;[03] SUBMITTED DAMAGE INFORMATION TO ENGINEERING REPAIR GIVEN ON SRM 53-70-51-2R-4 REPAIR 4 IS NOT APPLICABLE PER PAR 1.B DUE TO INTERCOSTAL LOCATED AT RBL7.;[04] VERIFIED CORRECTIVE ACTION STEP 3.;[05] VERIFIED CORRECTIVE ACTION STEPS 1 AND 2.;[06] UPDATED MEASUREMENT TABLE;[07] REPAIRED DAMAGE ON BS 986 FLOORBEAM UPPER FLANGE; RBL 4 - RBL 45; WL 208 PER EA 22-153-00793.;[08] VERIFIED CORRECTIVE ACTION #6 AND #7;[09] EDITING REMAINING THICKNESS SHOWN IN CORRECTIVE ACTION 2. REMAINING MATERIAL THICKNESS WAS INADVERTENTLY ENTERED AT .450' AND SHOULD NOW READ A REMAINING MATERIAL THICKNESS OF 0.045'.

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