Service difficulty report · Structure · Boeing 7377H4

Difficulty date
July 31, 2021
Submitted
September 7, 2021
Operation
Air carrier
Aircraft
N449WN
Make and model
Boeing 7377H4
Aircraft serial
32469
Aircraft time
60,089 hours, 35,684 cycles
Part
Structure
Condition
Corroded
Location
Bs 947-986
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 R/H INNER CHORD; BETWEEN STA.947 AND STA. 986.5 ; / [01] FOUND EXFOLIATE CORROSION ON INNER CHORD BETWEEN STA. 947 TO STA.986.5 R/H SIDE PER REF 737 SRM 53-70-15-1A-1; [02] VERIFIED FOUND EXFOLIATE CORROSION ON INNER CHORD BETWEEN STA. 947 TO STA.986.5 R/H SIDE; [03] REMOVED DAMAGE R/H INNER CHORD FROM STA 880 TO STA 1006 PER REF B737-700 SRM 51-40-02-0G-0.; [04] VERIFIED REMOVED DAMAGE R/H INNER CHORD FROM STA 880 TO STA 1006; [05] DRILLED NEW HOLES AT R/H INNER CHORD AS PER REF B737SRM 51-40-05-0G-0; [06] VERIFIED STEP 5 ; DRILLING OF NEW CHORD . OK TO TREAT AND PRIME HOLES AND COUNTER SINKS.; [07] LATE ENTRY; ORIGINAL MAT. 0.080'; MATERIAL LOSS 0.040'; MATERIAL REMAINING 0.040'; FOUND OUT OF LIMITS; REF. B737-7 SRM 53-70-15-1A-1 ALLOWABLE DAMAGE 1; [08] TREATED AND PRIMED FASTENER HOLES REF B737-7 AMM 51-21-41-370-802 & 51-21-73-370-804; [09] VERIFIED STEP STEPS 7 AND 8; [10] ON STEP 3 AND 4 WORD 'DAMAGE' IS REPLACED BY 'DAMAGED CHORD'; [11] OK TO INSTALL INNER CHORD; [12] INSTALLED PARTIALLY RH INNER CHORD BETWEEN STA 947 TO STA 986.5 PER SRM 51-40-02-0G-0; [13] COMPLETED FASTNER INSTALLATION ON R/H INNER CHORD BETWEEN STA. 947 AND STA.986.5 REF. B737-7 SRM 51-40-02-0G-0; [14] REMOVED AND REPLACED R/H INNER CHORD BETWEEN STA. 947 AND STA.986.5 REF. B737-7 SRM 51-40-02-0G-0; AND DRAWING 147A8501; [15] INSPECTED STEPS 12;13 AND 14; [16] INSPECTED REPLACEMENT

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