Service difficulty report · Stiffener · Boeing 7377H4

Difficulty date
June 28, 2021
Submitted
August 11, 2021
Operation
Air carrier
Aircraft
N750SA
Make and model
Boeing 7377H4
Aircraft serial
29802
Aircraft time
75,691 hours, 44,551 cycles
Part
Stiffener
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

LEFT HAND HORIZONTAL STABILIZER INSPAR RIB; STAB STA. 120.30; 2ND VERTICAL STIFFENER IS CRACKED. ; / [01] VERIFIED APPLICABILITY OF SRM 55-10-09-2R-5.; [02] REMOVED DAMAGE FROM 2ND VERTICAL STIFFENER; FLANGE AND WEB IAW SRM 55-10-09-2R-5; STEP 4.B.3.AND FIG. 204; [03] VERIFIED APPLICABILITY OF SRM AND REMOVAL OF DAMAGE PER SRM 55-10-09-2R-5; [04] HFEC INSPECTED TRIMMED EDGES OF CUTOUTS IN LOWER CHORD FLANGE; STIFFENER AND WEB PER 737NDT PART 6 51-00-00 PROCEDURE 23. NO CRACKS FOUND. CAL ID IS000450 S/N N500D000M120071; [05] HFEC ROTARY INSPECTED ALL OPEN HOLES COMMON TO REPAIR AREA PER 737NDT PART 6 51-00-00 PROCEDURE 16. FOUND CRACK IN ONE HOLE. GENERATED NON ROUTINE TTG8Q005R478. CAL ID IS000450 S/N N500D000M120071.07] REQUEST NTI TO VERIFY CRACK FREE ON LOWER FLANGE CUT OUT BELOW 2ND STIFFENER ON STAB RIB STA. 120.30 PAR SRM 55-10-09-2R-5 STEP 4-D; [08] PRIER TO STEP 1 L/H HORZ. STAB. RIB AT STA. 120.30 2ND VERTICAL STIFFENER OUT OF LIMITS PER SRM 55-10-09-1A-1 STEP 4-A; [10] ET INSPECTED CUT EDGE IAW 737 NDTM PART 6 51-00-00 PROCEDURE 23; NO CRACKS NOTED.<BR><BR>CAL ID IS000450 N500D; [11] FABRICATED REPAIR PARTS 1 EA T-SECTION P/N 7075-T6 AMS-QQ-A-200/15 LOT # 1463116-1; 1 EA ANGLE P/N BAC1490 7075-T6 AMS-QQ-A-250/13 LOT # 1461745-1; 1 EA FILLER WITH 7075-T6 #0.050' LOT # 5087747-1 AND 2 EA SHIMS WITH 7075-T6 #0.012' LOT # 1086450 IAW SRM 55-10-09-2R-5 PAR 4.G. FIG 204 TABLE 201.;

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