Service difficulty report · Support · 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
Support
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 FLOOR SUPPORT STA 954; RBL 8; WL 208. / [01] REMOVED CORROSION ON FLOOR SUPPORT STA 954; RBL 8; WL 208. MAX MATERIAL REMOVED WAS .018' 1' BY .5' FROM .075. OUT OF LIMITS PER SRM 53-70-51-1A-1.MEASURED DEPTH WITH SPHERICAL MICROMETER ID# IS000459; S/N 67127987; EXP 01/2023.;[02] VERIFIED CORRECTIVE ACTION 1.;[03] REMOVED INTERCOSTAL BETWEEN STA 947-967; RBL-8; WL-208; PER SRM 51-40-02-0G-0; 7.D.(6).;[04] LOCATED AND DRILLED NEW INTERCOSTAL PER SRM 51-40-05-0G-0; REF BOEING DWG 147A5760; SHEET 1; VIEW 1B3.;[05] VERIFIED CORRECTIVE ACTION 4.;[06] INSTALLED NEW INTERCOSTAL AT STA 947-967; RBL-8; WL-208 PER SRM 51-40-02-0G-0 7.D; REF BOEING DWG 147A5760; SHEET 1; VIEW 1B3 AND FLAGNOTE 2.;[07] VERIFIED CORRECTIVE ACTION 6.;[08] COMPLETED STEP 1; LOCATE/DRILL FLOOR FASTENER HOLES.;[09] VERIFIED STEP 1 AND CORRECTIVE ACTION 8.;[10] REMOVED CORROSION FROM FLOOR SUPPORT AT STA 954; RBL-8; WL-208; MATERIAL REMOVED OVER 1' X 0.5' AT MAX DEPTH OF 0.018' FROM 0.075' ORIGINAL MATERIAL THICKNESS. FOUND TO BE OUT OF LIMITS PER SRM 53-70-51-1A-1.<BR>REMOVED AND REPLACED FLOOR SUPPORT INTERCOSTAL AT STA 947-967; RBL-8; WL-208 PER SRM 51-40-02-0G-0 7.D; REF BOEING DWG 147A5760; SHEET 1; REV B.;[11] VERIFIED CORRECIVE ACTION 10.

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