Service difficulty report · Beam · Boeing 7377H4

Difficulty date
January 25, 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 FLOOR BEAM BS 986.5 RBL 42; LBL 42<[01] VERIFIED APPLICABILITY OF SRM 53-70-51-1A-1 FOR ALLOWABLE DAMAGE TO 986 FLOOR BEAM. REMOVED CORROSION AND FOUND TO BE OUT OF LIMITS AT RBL 42 WITH A MAX MATERIAL LOSS OF .030 AND LBL 42 WITH A MAX MATERIAL LOSS OF .020 USING TOOL ID# ATS1225 NSN CAL. DATE 08/22 DUE 08/23.;[02] VERIFIED CORRECTIVE ACTION #1;[03] REQUEST HFEC AT HOLE ON 986 FLOOR RBL 42 WL 208 PER SRM 51-10-02;FABRICATED, LOCATED AND DRILLED INTERCOSTAL REPAIR [8] QTY 2 CORNER FITTING LOT# 1517161-1. [6] QTY 2 FILLER 7075T6#0.020 LOT# 1353253-2. PER SRM 53-70-51-2R-4 REPAIR 4 FIG 207. REQUEST OK TO APPLY PRIMER.

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