Service difficulty report · Skin · Boeing 7377H4

Difficulty date
October 5, 2023
Submitted
October 12, 2023
Operation
Air carrier
Aircraft
N421LV
Make and model
Boeing 7377H4
Aircraft serial
32452
Aircraft time
71,597 hours, 42,416 cycles
Part
Skin
Part number
UNKNOWN
Condition
Cracked
Location
Zn 500 Left Wing
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

DURING REPAIR OF THE #4 SLAT SKIN; HFEC FOUND A CRACK IN THE ACTUATOR ATTACH FITTING. SLAT REPLACEMENT REQUIRED.<[01] UPDATED PARTS.;[02] COMPLETED STEP 1.<BR>STEP 2 VERIFIED PARTIAL.;[03] PARTIAL UPDATE STEP 2;[04] ADDED TOOL ID TO STEP 2;[05] PARTIAL UPDATE STEP 2;[06] VERIFIED STEP 2 STATEMENT 13 & STEP 3 STATEMENT 3;[07] REMOVED AND REPLACED #4 SLAT; ADJUSTMENT AND TESTS ARE GOOD IAW MM 27-81-21-000-801; MM 27-81-21-400-801;[08] VERIFIED MEASUREMENT TABLE.;[09] VERIFIED CORRECTIVE ACTION 7.

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