Service difficulty report · Rib · Boeing 7377H4

Difficulty date
July 13, 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
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

CRACK FOUND ON RT HORIZONTAL STABILIZER RIB ASSY AT STAB STA 120.3 3RD VERTICAL STIFFENER FROM FWD END ; / [01] REMOVED R/H HORIZ STAB INSPAR RIB AT STAB STA 120.30 FOR ACCESS FOR STAB RIB REPAIRS IAW SRM 55-10-09-2R4 PARA 4A AND SRM 51-40-02-0G-0 PARA 4 AND 7.; [02] REMOVED DAMAGED SECTION OF VERTICAL STIFFENER AND WEB IAW SRM 55-10-09-2R-4 PARA 4B(1 AND 2). DIMENSIONS OF STIFFENER TRIMOUT: 2.00'; DIMENSIONS OF WEB TRIMOUT: L=.900'; W=.335'.; [03] VERIFIED DAMAGE TRIM OUT PER SRM 55-10-09-2R-4 PARA 4B(1 AND 2). READY FOR NDI; [04] ET INSPECTED CUT EDGE AND HOLES IN REPAIR AREA IAW 737 NDTM PART 6 51-00-00 PROCEDURE 23 AND PROCEDURE 16; NO CRACKS NOTED.<BR><BR>CAL ID IS000450 N500D; [05] FABRICATED REPAIR PARTS OF: T-CHORD; 60-5872#7075T76511; LOT # 1430775-2; L-ANGLE; BAC1490-2793#7075T62; LOT# 1420465-1; SHIMS; 7075T6#0.016'; LOT# 1439717-1; PER SRM 55-10-09-2R4 PARA 4F THROUGH 4J AND TABLE 201. OK TO APPLY CHEMICAL CONVERSION COATING TO REPAIR PARTS AND RIB REPAIR AREA.; [06] VERIFIED GENERAL VISUAL INSPECTION OF THE REWORK AREA. VERIFIED FABRICATION OF REPAIR PARTS PER SRM 55-10-09-2R4 PARA 4F THROUGH 4J AND TABLE 201.; 9] PRIMED REPAIR PARTS AND RIB REPAIR AREA IAW SRM 55-10-09-2R-4 PARA 4L. OK TO INSTALL REPAIR PARTS ONTO RIB.; [10] VERIFIED STEP 9 OK TO INSTALL; [11] INSTALLED REPAIR PARTS ONTO RIB IAW SRM 55-10-09-2R-4 PARA 4M THROUGH 4R.;

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