Service difficulty report · Rib Doubler · Boeing 7377H4

Difficulty date
June 20, 2022
Submitted
August 11, 2022
Operation
Air carrier
Aircraft
N951WN
Make and model
Boeing 7377H4
Aircraft serial
36665
Aircraft time
39,132 hours, 23,683 cycles
Part
Rib Doubler
Condition
Cracked
Location
Rh Hor 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

RH HORIZ STAB INSPAR RIB ASSY 4 (STA 120.30) CRACKED AT 2ND VERTICAL STIFFENER APPROX 1' FROM BOTTOM. / [01] REMOVED DAMAGE AT 2ND STIFFENER L:1.800' W:.500' IAW SRM 55-10-09-2R-4APPLICABILITY STATEMENT SRM 55-10-09-2R-1 IT'S APPLICABLE FOR REPAIR;[04] VERIFIED CORRECTIVE ACTIONS #1 AND #3;[05] HFEC INSPECTED TRIMMED EDGE OF DAMAGE CUTOUT AND ALL FASTENER HOLES IN THE REPAIR AREA PER 737NDT PART 6 51-00-00 PROCEDURES 23 AND 16. NO CRACKS FOUND. TOOL N500 IS000450 DUE 02/2023.; 737-700 SRM 55-10-09-2R-4 IS EFFECTIVE FOR THIS REPAIR.<BR>REPAIR PARTS MATERIAL I.D.:<BR>ITEM {1} T-SECTION: 7075-T76511 EXTRUSION AMS-QQ-A-200/15.<BR>ITEM {2} ANGLE: BAC1490-2793#7075-T62 0.063' LOT 1464923-1<BR>ITEM {3} SHIM: 7075-T6 0.016'; LOT 1351319-2;[08] PERFORM GVI IAW SRM 55-10-09-2R-4; STEP 4E.;[09] LOCATED; DRILLED AND FABRICATED REPAIR PARTS IAW SRM 55-10-09-2R-4 REPAIR 4; ; STEPS 4F; G; H; I; J; K; L. TABLE 201; FIGURE 202; DETAIL A.;[10] ACCOMPLISHED A GVI OF ALL AREAS WITHIN THE REPAIR AREA FOR CORROSION; EXISTING REPAIRS OR ANY OTHER DEFECTS. IAW SRM 55-10-09-2R-4 REPAIR 4 STEP 4.E. NO DEFECTS NOTED OK TO INSTALL REPAIR PARTS;[13] INSTALLED REPAIR PARTS AT 2ND VERTICAL STIFFENER IAW SRM 55-10-09-2R-1;[14] APPLIED CHEMICAL CONVERSION COATING AND PRIMER AT REPAIR PARTS IAW SRM 55-10-09-2R-1 STEP 4(K) AND (L) APPLIED CIC AT RIB ASSY #4 IAW AMM 51-21-91-620-802

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