Service difficulty report · Skin · Boeing 7377H4

Difficulty date
November 4, 2021
Submitted
January 10, 2022
Operation
Air carrier
Aircraft
N770SA
Make and model
Boeing 7377H4
Aircraft serial
30589
Aircraft time
69,290 hours, 41,022 cycles
Part
Skin
Condition
Cracked
Location
Lt Nr 1 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

LT WING #1 SLAT HAS LWR SKIN CRACKED AT 3 EACH FASTENERS THAT ATTACH THE ACTUATOR FITTING AT SLAT STATION 451.97. 3-23 ; / [01] REMOVED 3EA. FASTENERS FOR NDT. INSPECTION IAW. B-737-700 SRM. 51-40-02-0G-0; [02] VERIFIED STEP 1; [03] PERFORMED HFEC INSP. ON SKIN AROUND 3EA. EXISTING FASTENER HOLES IAW B737 NDT PART 6; 51-00-00; PROCEDURE 23. CRACK CONFIRMED <BR>TOOL: NORTEC 600 B/C: 166316 DUE: 10/08/22; [04] PERFORMED HFEC ROTO INSP. OF 3EA EXISTING FASTENER HOLES IAW B737 NDT PART 6; 51-00-00; PROCEDURE 16. CRACKS NOTED <BR>TOOL: NORTEC 600 B/C: 166316 DUE: 10/08/22<BR>TOOL: OLYMPUS MINIMITE B/C: 172542 DUE: 08/20/2022; [05] PERFORMED HFEC ROTO COUNTER INSP. OF 3EA EXISTING FASTENER HOLES IAW B737 NDT PART 6; 53-30-00; PROCEDURE 3. CRACKS NOTED <BR>TOOL: NORTEC 600 B/C: 166316 DUE: 10/08/22<BR>TOOL: OLYMPUS MINIMITE B/C: 172542 DUE: 08/20/2022; [06] REMOVED L//W. PANELS #525EB; 525CB; 525DAB; 525DBB AND FLEXIBLE PANEL FOR ACCESS TO REPAIR IAW. B-737-700 SRM.51-40-02-0G-0; [07] CUT-OUT DAMAGE AREA AT L/W. #1 SLAT LWD. SKIN IAW. B-737-700-SRM. 57-42-01-2R-8 FIGURE202;[10] PERFORMED HFEC ROTO INSP. OF ALL INITIAL EXISTING FASTENER HOLES IN THE REPAIR AREA IAW B737 NDT PART 6; 51-00-00; PROCEDURE 16. CRACKS NOTED <BR>TOOL: NORTEC 600 B/C: 166316 DUE: 10/08/22 <BR>TOOL: OLYMPUS MINIMITE B/C: 172542 DUE: 08/20/2022; [11] FABRICATED REPAIR PART IAW. B-737-700 SRM. 57-42-01-2R-8 FIGURE 202;

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