Service difficulty report · Stiffener · Boeing 737

Difficulty date
August 18, 2022
Submitted
September 22, 2022
Operation
Air carrier
Aircraft
N489WN
Make and model
Boeing 737
Aircraft serial
33855
Aircraft time
57,460 hours, 34,246 cycles
Part
Stiffener
Part number
144A771436
Condition
Corroded
Location
Pressure Deck
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 PRESSURE DECK STIFFENER; 706+12; RBL 68; WL 202. / [01] CLEANED; INSPECTED; AND REMOVED CORROSION ON PRESSURE DECK STIFFENER AT STA 706+12; RBL 68; WL 202 PER SRM 51-10-02-0G-0 STEP 15. NO SRM DAMAGE LIMITS.;[02] VERIFIED;[03] CERTIFIED MEASUREMENT TABLE.;[04] VERIFIED ITEM 1 CORRECTIVE ACTIONS.<BR>PERFORMED A 10X DVI PER SRM 51-10-02-0G-0. STEP 15 A (6) (A). NO ADDITIONAL DAMAGE NOTED.;[05] UPON FURTHER INVESTIGATION FOUND BLENDED AREA TO NOT BE ON THE STIFFENER BUT THE WEB COMMON TO STIFFENER AT BS 706+12 RBL 68.;[06] VERIFIED CORRECTIVE ACTION ITEM 5.<BR><BR>UT INSPECTED BLEND AREA ON THE WEB PER NDTM PART 4; 51-00-00 PROCEDURE 2. MINIMUM REMAINING THICKNESS IS 0.052'<BR><BR>EPOCH 650 CAL ID: ATS2342 S/N: 190848504 DUE: 07/2023<BR><BR>** MEASUREMENT TABLE REQUIRES UPDATE;[07] UPDATED MEASUREMENT TABLE. RBL 68 NOT AVAILABLE IN DROP-DOWN MENU.;[08] CARD COMPLETE