Service difficulty report · Skin · Boeing 75724APF

Difficulty date
April 19, 2025
Submitted
May 14, 2025
Operation
Air carrier
Aircraft
N447UP
Make and model
Boeing 75724APF
Aircraft serial
27736
Aircraft time
35,880 hours, 20,372 cycles
Part
Skin
Part number
185N30031
Condition
Dented
Location
Zone 300
Stage of operation
IN
How discovered
V
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

*** MAJOR REPAIR *** 3EA DENTS ON LH HORIZONTAL STAB UPPER SKIN AT APROXIMATELY FS STA 90. DOT 21-18. REPAIR IAW: 757-200PF SRM REV 122 CHAPTER 51-70-10-2R-2, 250 DEG. F CURE PER SRM DETAIL III PER SRM 55-10-01-1A-1. UPPER SKIN OF LH HORIZONTAL STABILIZER UPPER SKIN PANEL BONDED ASSY HAS 3 EACH DENT DAMAGES. DENT #1 DIMENSION: DIAMETER = 0.90 INCH. DENT #2 DIMENSION: DIAMETER = 0.35 INCH. DENT #3 DIMENSION: DIAMETER = 0.50 INCH. DENT #1 WAS NOTED WITH DELAMINATION DAMAGE. UPPER SKIN PANEL P/N: 185N3003-1. ORIGINAL MAT.: 0.100 INCH THICK, 7075-T6 CLAD SH. UPPER SKIN PANEL BONDED ASSY. P/N: 185N3001-51. THIS IS A CATEGORY A REPAIR PER SRM 51-00-06.

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