Service difficulty report · Spar · Boeing 73776N

Difficulty date
January 20, 2023
Submitted
March 6, 2023
Operation
Air carrier
Aircraft
N7885A
Make and model
Boeing 73776N
Aircraft serial
33379
Aircraft time
62,518 hours, 31,343 cycles
Part
Spar
Condition
Corroded
Location
Zn 600 Right Win
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 RIGHT WING FRONT SPAR AROUND BOOST PUMP UPPER BONDING JUMPER IFSS119. MARKED<[01] VERIFIED APLICABILITY SRM 57-20-10-1A-3 ALLOWABLE DAMAGE 3;[02] REMOVED CORROSION ON R/H WING FRONT SPAR AROUND BOOST PUMP UPPER BONDING JUMPER PER SRM 57-20-10-1A-3;[03] DO A FLOURESCENT PENETRANT INSPECTION OF REWORKED AREA;[04] VISUALLY INSPECTED THE REWORK AREA ON THE FRONT SPAR BOOST PUMP UPPER BONDING JUMPER POINT. NO CORROSION NOTED VISUALLY.;[05] PT INSPECTED AREA IAW SOPM 20-20-02. <BR>NO DEFECTS NOTED. <BR>EQUIP USED: <BR>-RADIOMETER ID: ATS2504-A; B; C CAL DUE: 05/23;[06] UT REQUEST AT REWORKED AREA TO VERIFY REMAINING THICKNESS; ORIGINAL THICKNESS 0.480 IAW SRM 57-20-10-1A-3; SEE GRID MAP ATTACHED 0.250' X 0.250';[07] ACCOMPLISHED UT THICKNESS INSPECTION IAW 737 NDTM PART 4 CHAPTER 51-00-00 PROCEDURE 2.<BR>REMAINING MINIMUM MATERIAL 0.286' SEE ATTACHED GRID.<BR><BR>EQUIPMENT USED: EPOCH 650 ID: ATS2342 CAL DUE: 07/2023;[08] PERFORMED FLAP PEEN AT REWORKED AREAS AT FRONT SPAR AROUND BOOST PUMP UPPER AND LOWER BONDING JUMPER IAW 57-20-10-1A-3<BR>FLAP PEEN KIT ID: ATS 2771 S/N 22181705 DUE: 07/2023.<BR>TACHOMETER ID: ATS 127 S/N: 1372941 DUE: 03/2023;[09] VERIFIED CORRECTIVE ACTION 8.;[10] VERIFIED THE MEASUREMENT TABLE.;[21] THE DAMAGE WAS REPAIRED PER 737-700 SRM 57-20-10; ALLOWABLE DAMAGE 3 AND EA 23-157-00357;

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