Service difficulty report · Support · Boeing 7378H4

Difficulty date
January 10, 2023
Submitted
February 2, 2023
Operation
Air carrier
Aircraft
N8519R
Make and model
Boeing 7378H4
Aircraft serial
36910
Aircraft time
20,262 hours, 9,764 cycles
Part
Support
Part number
NOTENTERED
Part serial
NOTENTERED
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 SUPPORT STA 949; STA 958 LBL 49-LBL 50; WL 208.<[01] SRM 53-70-51-1A-1 IS APPLICABLE ALLOWABLE DAMAGE; UPDATED TABLE.;[02] COMPLETED STEPS 1; 2 CORROSION REMOVAL.;[03] VERIFIED CORROSION REMOVAL- STEPS 1 AND 2;[04] UT INSPECTED BLENDED AREA IAW 737 NDTM PART 4 51-00-00 PROCEDURE 2.<BR>REMAINING MATERIAL THICKNESS IS 0.185' ADJACENT TO 0.205'. <BR>EQUIP USED: <BR>-EPOCH 650 ID: ATS2031 CAL DUE: 03/23;[05] CORRECTION TO CORRECTIVE ACTION 4.<BR><BR>REMAINING MATERIAL THICKNESS STA 949 IS:<BR>0.185' ADJACENT TO 0.205'<BR>0.095' ADJACENT TO 0.145'<BR>0.082' ADJACENT TO 0.085'<BR><BR>REMAINING MATERIAL THICKNESS STA 958 IS:<BR>0.078' ADJACENT TO 0.080';[06] EVALUATED DAMAGE ON FLOOR SUPPORT STA 949; STA 958 LBL 49-LBL 50; WL 208. MAX MATERIAL REMOVED FOUND TO BE 0.050' FROM AREA OF ORIGINAL THICKNESS OF 0.145'. DAMAGE FOUND TO BE OUT OF LIMITS PER SRM 53-70-51-1A-1.;[07] VERIFIED CORRECTIVE ACTIONS STEP 6.;[08] PARTIAL STEP 3;[09] VERIFIED STEP 3 PARCIAL;[10] PARTIAL STEPS 1-3;[11] VERIFIED STEPS 1-3;[12] VERIFIED MEASUREMENT TABLE.

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