Service difficulty report · Rib · Boeing 7377H4

Difficulty date
July 6, 2021
Submitted
August 4, 2021
Operation
Air carrier
Aircraft
N417WN
Make and model
Boeing 7377H4
Aircraft serial
29822
Aircraft time
65,751 hours, 38,956 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

RIGHT HORIZONTAL STABILIZER; RIB #8 FWD SECTION LOWER END; CRACKED NOTED. ; / [01] FABRICATED REPAIR ANGLE; MATERIAL USED 7075-O .063 PO#1416601 REF B737-700 SRM-55-10-09-2R-5.; [02] VERIFIED STEP 1; [03] HEAT TREATED NEW ANGLE FROM 7075-O TO 7075-T62 REF BAC5602 AND AAR FORM OP 84-REV7.; [04] (RII) VERIFIED HEAT TREATMENT OF FABRICATED ANGLE.; [05] CUTOUT DAMAGED AREA AT RIGHT HORIZONTAL STABILIZER RIB #8 FWD SECTION LOWER END PER B737-700 SRM 55-10-09-2R-5; [06] (RII) VERIFIED STEP #5; CUTOUT DAMAGE.; [07] PERFORMED HFEC INSP. ON CUT-OUT AREA IAW B737 NDT PART 6; 51-00-00; PROCEDURE 23. NO CRACKS NOTED <BR>TOOL: NORTEC 600 B/C:166317 DUE: 10/12/21; [08] PERFORMED HFEC ROTO INSP. ON EXISTING FASTENER HOLES ON REPAIR AREA IAW B737 NDT PART 6; 51-00-00; PROCEDURE 16. NO CRACKS NOTED <BR>TOOL: NORTEC 600 B/C:166317 DUE: 10/12/21; [09] LOCATED AND DRILLED REPAIR ANGLE AT RIGHT HORIZONTAL STABILIZER RIB #8 FWD SECTION LOWER END PER B737-700 SRM 55-10-09 2R-5; [15] INSTALLED REPAIR PART AT R/H. HORIZ. STAB. IAW. B-737-700 SRM 55-10-09-2R-5 REPAIR 5 FIGURE 205 SHEET 1;

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