Service difficulty report · Skin · Boeing 7377BD

Difficulty date
February 28, 2023
Submitted
April 3, 2023
Operation
Air carrier
Aircraft
N556WN
Make and model
Boeing 7377BD
Aircraft serial
33936
Aircraft time
37,398 hours, 21,958 cycles
Part
Skin
Condition
Corroded
Location
Zn 100 Fus Lower
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

CORROSION ON CROWN SKIN UNDER VERT STAB 3 INCHES O/B OF STRINGER 2L BETWEEN STA 1016 AND STA 1040. (MARKER)<[01] INSTALLED EWIS PROTECTION AT DISCREPANCY AREA AT INTERNAL SKIN PER AMM 20-60-07;[02] SRM 53-80-01-0I-1 IDENTIFICATION AND SRM 53-00-01-1A-1 ALLOWABLE DAMAGE ARE APPLICABLE.<BR>REMOVED 17 EA FASTENER TO FOM PER SRM 51-40-02.<BR>REMOVED CORROSION AROUND FASTENER HEADS L=0.5' W=0.5' BETWEEN BS1016-BS1040 AND 3' O/B OF STR 2L PER SRM 51-40-02.;[03] VERIFIED STEP 1 AND 2.;[05] AT CORRECTIVE ACTION 2 DAMAGE REMOVAL REFERENCE ENTRY AN ERROR MEAN TO BE SRM 51-10-02.<BR>EVALUATED DAMAGE REMOVAL AT DISCREPANCY AREA AROUND 17EA FASTENERS HEADS AROUND FASTENER HEADS L=0.5' W=0.5' BETWEEN BS1016-BS1040 AND 3' O/B OF STR 2L. ORIGINAL MATERIAL THICKNESS 0.080' REMAINING 0.078' MAX LOSS 0.003' FOUND TO BE OUT OF LIMITS DUE TO MATERIAL REMOVAL AROUND FASTENERS MORE THAN 3 FASTENER IN ALL GROUP OF 10 PER SRM 53-00-01-1A PARAGRAPH 4.A.2 FIG 103 DETAIL D.

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