Service difficulty report · Intercostal · Boeing 7377H4

Difficulty date
July 21, 2021
Submitted
August 18, 2021
Operation
Air carrier
Aircraft
N444WN
Make and model
Boeing 7377H4
Aircraft serial
29839
Aircraft time
61,121 hours, 35,983 cycles
Part
Intercostal
Condition
Corroded
Location
Bs 262 Lbl 10
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 TOP SURFACE OF INTERCOSTAL AT BS 262; WL 207; LBL 9.7 ; / [01] REMOVED CORROSION ON TOP SURFACE OF INTERCOSTAL AT BS 262; WL 207; LBL 9.7. DIMENSIONS OF DAMAGE REMOVAL FOUND TO BE 2.3' X 0.9' PER SRM 53-10-51-1A-1.; [04] REQUEST NDI TO PERFORM HFEC INSPECTION OF DAMAGE REMOVAL BLEND AREA ON TOP SURFACE OF INTERCOSTAL AT BS 262; WL 207; RBL 9.7 TO VERIFY CRACK FREE CONDITION.; [05] REQUEST NDI TO PERFORM HFEC INSPECTION OF OPEN HOLES IN DAMAGE REMOVAL BLEND AREA ON TOP SURFACE OF INTERCOSTAL AT BS 262; WL 207; RBL 9.7 TO VERIFY CRACK FREE CONDITION.; [06] UT INSPECTED BLEND IAW 737 NDTM PART 4 51-00-00 PROCEDURE 2. REMAINING THICKNESS IS 0.141' ADJACENT TO 0.150' AND 0.050' ADJACENT TO .060'; GRID ATTACHED TO COVER SHEET. EQUIP ID#: ATS2031 S/N: 170515011; [07] HFEC INSPECTED BLEND IAW 737 NDTM PART 6 51-00-00 PROCEDURE 23; NO CRACKS NOTED. EQUIP ID#: IS000450 S/N: N500D000M120071; [08] HFEC INSPECTED OPEN HOLES IAW 737 NDTM PART 6 51-00-00 PROCEDURE 16; NO CRACKS NOTED. EQUIP ID#: IS000450 S/N: N500D000M120071 EQUIP ID#: ATS2407 S/N: MM1591DD064104; [20] ADDING OUT OF LIMITS STATEMENT. DAMAGE FOUND TO BE OUT OF LIMITS PER SRM 53-10-51-1A-1 ; FIG. 105; DETAIL E.; [22] VERIFIED ADDING OUT OF LIMITS STATEMENT. DAMAGE FOUND TO BE OUT OF LIMITS PER SRM 53-10-51-1A-1 ; FIG. 105; DETAIL E.

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