Service difficulty report · Skin · Boeing 7377H4

Difficulty date
June 12, 2024
Submitted
July 18, 2024
Operation
Air carrier
Aircraft
N476WN
Make and model
Boeing 7377H4
Aircraft serial
32475
Aircraft time
66,646 hours, 39,887 cycles
Part
Skin
Condition
Cracked
Location
Zone 300
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 RIGHT HORIZONTAL STABILIZER LOWER SKIN AT STAB STA 193.90 ; 16' FROM FRONT SPAR; I/B ROW. CRACK LENGTH : O.343' CRACK FOUND ON RIGHT HORIZONTAL STABILIZER LOWER SKIN AT STAB STA 193.90 16' FROM FRONT SPAR I/B ROW. CRACK LENGTH : O.343'<SUMMARY=REMOVED PAINT FOR ACCESS FASTENER ON REPAIR AREA LOWER SKIN STA 193.90 16' AS PER REF B/737 AMM 51-21-11-150-801.<BR>REMOVED FASTENERS ON LOWER SKIN ON R/H HORIZONTAL STAB STA 193.90 16' AS PER REF B/737 SRM 51-40-02-0G-0.<BR>REMOVED DAMAGE AT LOWER STABILIZER SKIN AT STABILIZER STA 193.90 16' FROM FRONT SPAR I/B ROW AS PER SRM 55-10-01-2R-11 REPAIR 11 PERFORMED ROUGHNESS TEST TOOL USED B/C# 172331 NO CALIBRATION DUE DATE.<BR>FABRICATED REPAIR FILLER. MATERIAL USED 2024 T-3 0.080 PO#2072607 AND DOUBLER AS PER REF B/737 SRM 55-10-01-2R-11 REPAIR 11. MATERIAL USED 2024 T-3 0.080 PO#2071143.PERFORMED ROUGHNESS TEST. USED TOOL B/C 172331 NO DUE DATE.<BR>TREATED AND PRIMED LOWER SKIN AREA OF REPAIR AND FILLER AND DOUBLER AS PER REF B/737 SRM 55-10-01-2R-11 REPAIR 11.<BR>INSTALLED COUNTERSINK REPAIR WASCHES AS PER REF B/737 SRM 55-10-01-2R-11 REPAIR 11.<BR>INSTALLED REPAIR PARTS R/H HORIZONTAL STAB LOWER SKIN AT STA 193.90' 16' FRONT SPAR AS PER REF B/737 SRM 55-10-01-2R-11 REPAIR 11.<BR>MIXED SEALANT 0870B002BM 06/018/24 7:00PM. SQUEEZE OUT TIME 06/18/24 10: PM.<BR>APPLIED SEALANT AROUND THE EDGE OF THE DOUBLER AS PER REF B/737 SRM 55-10-01-2R-11 REPAIR 11.

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