Service difficulty report · Rib · Boeing 7377H4

Difficulty date
May 17, 2021
Submitted
June 28, 2021
Operation
Air carrier
Aircraft
N207WN
Make and model
Boeing 7377H4
Aircraft serial
34012
Aircraft time
52,378 hours, 31,227 cycles
Part
Rib
Condition
Cracked
Location
Horizontal Stab
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

R/H STAB STA 120.3 INSPAR RIB CRACKED AT THIRD STIFFENER FROM FRONT ; / [01] TRIMMED OUT THE DAMAGED PART AT R/H STAB STA 120.30 INSPAR RIB AT THIRD STIFFENER IAW SRM 55-10-09-2R-4; [02] VISUALLY VERIFIED DAMAGE REMOVAL PER SRM 55-10-09-2R-4 REPAIR 4; [03] HFEC REQUEST ON THE CUT OUT EDGES; WEB AND EXISTING FASTENERS HOLES WITHIN THE REPAIR AREA TO ENSURE NO CRACKS EXIST.; [04] ET INSPECTED CUT OUT AND HOLES IAW 737 NDTM PART 6 51-00-00 PROCEDURE 23 AND PROCEDURE 16; NO CRACKS NOTED.<BR><BR>CAL ID IS000450 N500D; [05] FOUND CRACK 3/16' ABOVE DAMAGE CUTOUT WHILE WORKING FLANGE CUTOUT REF TTG8Q0052Y2Z. MARKED IN RED INK. WILL REQUIRE ADDITIONAL DAMAGE REMOVAL. CAL ID IS000450 N500D; [06] HFEC REQUEST ON THE DAMAGE CUT OUT EDGES IN WEB.; [07] HFEC INSPECTED TRIMMED EDGES OF CUTOUT ON FLANGE PER 737NDT PART 6 51-00-00 PROCEDURE 23. CRACK FOUND AND MARKED AS NOTED IN ITEM 5 . CAL ID ATS729 N500D; [08] HFEC REQUEST ON TRIMMED EDGES OF CUTOUT ON FLANGE.; [09] TRIMMED OUT ADDITIONAL MATERIAL TO REMOVE CRACK.; [10] HFEC INSPECTED TRIMMED EDGES OF CUTOUT ON FLANGE PER 737NDT PART 6 51-00-00 PROCEDURE 23. NO CRACKS NOTED . CAL ID ATS729 N500D; [11] FABRICATED REPAIR PARTS (1) T-SECTION FROM 60-5872 7075 T76511 LOT# 1449876-1 (2) ANGLE FROM BAC1490-2793#7075T62 LOT# 1449279-1 (3) SHIM FROM 7075T6 #0.020SH CLAD LOT#1381332-1; APPLIED CHEMICAL CONVERSION COATING IAW SRM 55-10-09-R2-4. OK TO PRIME.

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