Service difficulty report · Skin · Boeing 7377H4

Difficulty date
July 13, 2023
Submitted
August 9, 2023
Operation
Air carrier
Aircraft
N411WN
Make and model
Boeing 7377H4
Aircraft serial
29821
Aircraft time
72,372 hours, 43,147 cycles
Part
Skin
Part number
UNKNOWN
Condition
Cracked
Location
Lt Wing 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

CRACK AROUND THE FASTENER AT NO.1 SLAT LOWER SURFACE OF THE L/E SLAT NOSE SKIN AT ACTUATOR RIBS. MARKED<[01] REMOVED COVE PANELS 525DAB; 525DBB; 525CB IAW SOPM 20-50-01.;[02] REMOVED COVE PANEL 525EB IAW SOPM 20-50-01.;[03] REMOVED SLAT FLEX SKIN IAW SRM 57-42001-2R-8 PARA. 4.;[04] REMOVED INITIAL FASTENERS AS REQUIRED IN REPAIR AREA AND CUT AND REMOVED DAMAGED PART OF SLAT NOSE SKIN IAW SRM 57-42-01-2R-8 PARA. 4.;[05] VERIFIED CORRECTIVE ACTION STEP 4.;[06] VALIDATED APPLICABILITY OF SRM 57-42-01-2R-8.;[07] VERIFIED CORRECTIVE ACTION STEP 6.;[08] FABRICATED REPAIR DOUBLER (1) FROM 7075T6 0.071' CLAD ; LOT # 1497836-1. REPAIR FILLER (2) FROM 7075T6 0.063' CLAD; LOT# 1533932-1. INSTALLED COUNTERSINK REPAIR WASHERS AS REQUIRED IN SLAT NOSE SKIN. APPLIED CHEMICAL CONVERSION COATING AND PRIMER TO REPAIR PARTS AND BARE AREA OF REPAIR AREA ON SLAT NOSE SKIN IAW SRM 57-42-01 2R-8 PARA. 4.F. OK TO INSTALL.

More about the Boeing 737-7H4