Service difficulty report · Skin · Boeing 7377CT

Difficulty date
June 4, 2021
Submitted
July 12, 2021
Operation
Air carrier
Aircraft
N7823A
Make and model
Boeing 7377CT
Aircraft serial
32749
Aircraft time
61,112 hours, 30,940 cycles
Part
Skin
Condition
Corroded
Location
Bs 694
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 FUSELAGE SKIN AT BODY STATION 694; RBL 1; WL 306. / [01] REMOVED CORROSION ON FUSELAGE SKIN BS694 RBL1 WL306;1'X1' AREA I.A.W SRM 51-10-02-0G-01 AND ARM90-7023-01 TABLE 3001 ZONE 1; [02] VERIFIED REMOVED CORROSION ON FUSELAGE SKIN BS694 RBL1 WL306;1'X1' AREA I.A.W SRM 51-10-02-0G-01 AND ARM90-7023-01 TABLE 3001 ZONE 1; [03] UT INSP BLEND IAW 737 NDTM PART 4 51-00-00 PROCEDURE 2; REMAINING THICKNESS IS 0.036' ADJACENT TO 0.040'. EQUIP ID#: ATS2031 S/N: 170515011; [04] HFEC INSP BLEND IAW 737 NDTM PART 6 51-00-00 PROCEDURE 23; NO CRACKS NOTED. EQUIP ID#: IS000450 S/N: N500D000M120071; [05] DAMAGE ON FUSELAGE SKIN BS694;RBL1;WL306 FOUND TO BE OUT LIMITS I.A.W ARM90-7023-01 TABLE 3001 ZONE 1 ORIGINAL MATERIAL THICKNESS IS 0.040' REMAINING MATERIAL TICKNESS IS 0.036'; [06] VERIFIED DAMAGE ON FUSELAGE SKIN BS694;RBL1;WL306 FOUND TO BE OUT LIMITS I.A.W ARM90-7023-01 TABLE 3001 ZONE 1 ORIGINAL MATERIAL THICKNESS IS 0.040' REMAINING MATERIAL TICKNESS IS 0.036'; [07] UPDATING MEASUREMENTS FOR FAULT.; [08] AS PER EA 21-153-01632; THE DAMAGES ARE ALLOWABLE FOR CONTINUED SERVICE WITH REPETITIVE INSPECTIONS DEFINED ON 21-153-01632-INSP.; [09] VERIFIED STEPS COMPLETE.; [10] VERIFIED STEPS COMPLETE.

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