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 L/H INNER CHORD; BETWEEN STA 947 AND STA. 986.5 ; / [01] REMOVED CORROSION ON L/H INNER CHORD FROM STA 947 AND ASTA. 986.5 PER SRM 51-10-02-0G-0; FOUND EXFOLIATION CORROSION; OUT OF LIMITS PER SRM 53-70-15-1A-1; [02] VERIFIED REMOVED CORROSION ON L/H INNER CHORD FROM STA 947 AND ASTA. 986.5 PER SRM 51-10-02-0G-0; FOUND EXFOLIATION CORROSION; OUT OF LIMITS.; [03] REMOVING FASTENERS ON INNER CHORD PER REF 737 SRM 51-40-02-0G-0; [04] REMOVED L/H INNER CHORD FROM STA.880 TO STA. 1006 PER REF 737 SRM 51-40-02-0G-0; [05] VERIFIED STEP 3 AND 4; [06] LOCATED AND DRILLED NEW INNER CHORD PER REF 737 SRM 51-40-05-0G-0; [07] (RII) VERIFIED LOCATION AND DRILLING STEP 6.; [08] OK TO TREAT AND PRIME CHORD AND FLOOR AREA.; [09] TREATED AND PRIMER L/H INNER CHORD PER REF. 737 AMM 51-21-41-370-802 AND 51-21-72-370-804; [10] TREATED AND PRIMER FLOOR AREA PER REF 737 AMM 51-21-41-370-802 AND 51-21-72- 370-804; [11] VERIFIED STEPS 9 AND 10.; [12] (RII) OK TO INSTALL NEW INNER CHORD.; [13] STARTED TO INSTALL FASTENERS ON L/H INNER CHORD PER REF SRM 51-40-02-0G-0; [14] INSTALLED L/H INNER CHORD AT L-2 DOOR; PER REF. B737 SRM 51-40-02-0G-0 AND DRAWING 147A8501; [15] VERIFIED STEP 13-14; [16] REMOVED AND REPLACED DAMAGED L/H INNER CHORD AT L-2 DOOR AREA; PER REF. B737 SRM 51-40-02-0G-0 AND DRAWING 147A8501.; [17] VERIFIED STEP 16

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