Service difficulty report · Rib · Boeing 7879

Difficulty date
January 30, 2024
Submitted
February 21, 2024
Operation
Air carrier
Aircraft
N38950
Make and model
Boeing 7879
Aircraft serial
36401
Aircraft time
42,265 hours, 4,067 cycles
Part
Rib
Part number
166Z158095041
Condition
Cracked
Location
#7 Slat
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

VISUAL INSPECTION OF AREA AROUND #7 SLAT ROTARY ACTUATOR FOUND 2 CRACKS. UPPER CRACK APPROX 1 ", LOWER CRACK APPROX 1.5". LEADING EDGE SUPPORT STRUCTURE PIECE PNR 166Z1580-9504-1. LOCKED FOR MAINT FERRY PURPOSES. INSPECTED STEPS 1 THRU 4A AND 5 THRU 7 OF AVO11987 REV.A NO OTHER DAMAMAGE NOTED UNLOCKED. C/W STEPS 1 THRU 4A AND 5 THRU 7 OF AVO11987 REV.A NO OTHER DAMAMAGE NOTED INSPECTED ALL STEPS OF AVO11987 REV. B , NO OTHER DEFECT NOTED. C/ W ALL STEPS OF AVO11987 REV. B , NO OTHER DEFECT NOTED. VERIFIED MATERIAL OF FORMED REPAIR ANGLES AND FILLERS FABRICATED INSPECTED STEPS A 1 THRU 2 OF AVO11987 REV. D OF HFEC AND VISUAL FROM 0.090" 7075-O BARE (PO # 2436195330) TO BE HEAT TO T62 INSPECTION NO DEFECT NOTED AND VERIFIED THE CORNER RADII ON CONDITION REF. STEP 9 OF AVO 11987 REV. D TRIM-OUT TO BE 0.050 INCH REF. STEP B 1A OF AVO. VERIFIED MATERIAL OF FORMED REPAIR ANGLES AND FILLERS FABRICATED C/W STEPS A 1 THRU 2 OF AVO11987 REV. D OF HFEC AND VISUAL FROM 0.090" 7075-O BARE (PO # 2436195330) TO BE HEAT TO T62 INSPECTION NO DEFECT NOTED AND VERIFIED THE CORNER RADII ON CONDITION REF. STEP 9 OF AVO 11987 REV. D TRIM-OUT TO BE 0.050 INCH REF. STEP B 1A OF AVO. HEAT TREAT 7 PCS,7075-0.090" BARE TO 7075-T62 CONDITION ON P.O # THIS TASK WILL REQUIRE INSPECTION BUY BACK AFTER COMPLETION. VERIFIED HEAT TREAT OF 7 PCS 7075-0 TO 7075-T62 ON 44.0008 AND H -2436195 PER BAC5602. ALL WORK C/W BY UAL SFO SHOP BY TECH#11685 EAT TREAT FORM 43-0150. 04 AND UAL QC-77192. HEAT TREAT FORM 43-

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