Service difficulty report · Spar · Boeing 7377H4

Difficulty date
December 17, 2021
Submitted
February 7, 2022
Operation
Air carrier
Aircraft
N454WN
Make and model
Boeing 7377H4
Aircraft serial
29851
Aircraft time
59,747 hours, 35,307 cycles
System (JASC)
5711 · Wing Spar
Part
Spar
Condition
Corroded
Location
Rt Wing
Stage of operation
NR
How discovered
9
Nature of condition
O
Precautionary procedure
O

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

CORROSION >>>>>. RT WING FRONT SPAR CORRODED AROUND BOOST PUMP FWD 2 ;LOWER BONDING WIRE ATAACHMENT POINT.MKD 126-5 ; / REWORKED AREA OUT OF LIMITS.; [15] OK TO FLAP PEEN; [16] PERFORMED FLAP PEEN ON REWORKED AREA AROUND BOOST PUMP FWD 2 AT RT WING FRONT SPAR AS PER REF B737 51-20-06 AND SRM 57-20-10-1A-3; [17] ADDING EQUIPMENT USED ON FLAP PEEN KIT: BC 19435 DD:09-JUL-22; BC 5663 DD:10-AUG-22;; [18] VERIFIED 16 AND 17. OK TO TREAT AND PRIME; [19] TREATED AND PRIMED REWORKED AREA AS PER REF B737-700 AMM 51-21-41-370-803 AND AMM 51-21-72-370-804; [20] VERIFIED 19. OK TO REINSTALL FASTENERS REMOVED FOR ACCESS; [21] INSTALLED FASTENERS (3EA) REMOVED ON STEP 4 PER B737-700 SRM 51-40-02-0G-0.; [22] APPLIED SEALANT ON FASTENERS (3A) IAW B737-700 AMM 51-31-00-390-805.; OK TO INSTALL TANK PLATES #631AB AND 631BB.; [26] INSTALLED FUEL TANK PLATES 631AB AND 631BB IAW B737-700 AMM 28-11-31-400-801. TORQUE WRENCH USED- B/C: 16042 AND CAL DUE DATE: 05/03/22 APPLIED SEALANT AROUND JUMPER TEMINAL AND FASTENER HEADS PER B-737-7 AMM 28-22-41-400-801 STEP 3.H.(24).; [37] VERIFIED STEP 36.; [38] APPLIED CIC TO RT WING FWD SPAR I/B AROUND BOOST PUMP PER B-737-7 AMM 51-21-91-620-802; [39] VERIFIED CIC APPLICATION.;SUMMARY EA 22-157-00231 HAS BEEN APPROVED; ACTIVATED; AND ADDED AS A SUBTASK TO FAULT TTG8Q009VYKV.; [41] FOUND REWORKED AREA WITHIN LIMITS AS PER SWA EA 22-157-00231<BR>SUMMARY EA 22-157-00231 HAS BEEN APPROVED; ACTIVATED; AND ADDED AS A SUBTASK TO FAULT TTG8Q009VYKV.;

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