Service difficulty report · Angle · Boeing 7378H4

Difficulty date
March 16, 2023
Submitted
April 19, 2023
Operation
Air carrier
Aircraft
N8530W
Make and model
Boeing 7378H4
Aircraft serial
63592
Aircraft time
19,862 hours, 9,651 cycles
Part
Angle
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

AFT CARGO L/H TRANSITION ANGLE CORROSION FROM STA 727F THRU STA 847.<[01] REMOVED L/H TRANSITION ANGLE PER SRM 51-40-02 TO FOM;[02] REMOVED DAMAGE OF .010IN OF MATERIAL. REMAINING THICKNESS OF .040IN. ORIGINAL THICKNESS OF .050IN. FOUND TO BE OUT OF LIMITS PER SRM 53-00-53-1A-2.;[03] TRANSITION ANGLE CUT AT 727J+13? AND 727F+10?. FABRICATED NEW TRANSITION ANGLE SECTION FROM 727+4? TO 727F+10?; FABRICATED NEW TRANSITION ANGLE SECTION FROM 727F+10? TO 727J+13?; AND FABRICATED NEW TRANSITION ANGLE SECTION FROM 727J+13? TO 847. FABRICATED REPAIR SPLICE PLATES FOR 727F+10? AND FOR 727J+13? ALL PER SRM 53-00-53-2R-5.;[04] VERIFIED STEP#3. LONNIE HERMANN (TECHNICIAN); 29-MAR-2023 06:05 UTC TRANSITION ANGLE CUT AT 727J+13? AND 727F+10?. FABRICATED NEW TRANSITION ANGLE SECTION FROM 727+4? TO 727F+10?; FABRICATED NEW TRANSITION ANGLE SECTION FROM 727F+10? TO 727J+13?; AND FABRICATED NEW TRANSITION ANGLE SECTION FROM 727J+13? TO 847. FABRICATED REPAIR SPLICE PLATES FOR 727F+10? AND FOR 727J+13? ALL PER SRM 53-00-53-2R-5.;[05] INSTALLED ADHESIVELY BONDED NUTPLATES ON NEW TRANSITION ANGLE FROM STA 727+4? TO 847 PER SRM 51-40-10.;[06] INSPECTED WORK ABOVE;[07] RII OK TO INSTALL L/H TRANSITION ANGLE REPAIR SECTIONS STA. 727+4 TO STA. 847.;[08] INSTALLED REPAIR PARTS PER SRM 53-00-53-2R-5.;[09] RII. VERIFIED INSTALLATION OF L/H TRANSITION ANGLE 727+4 TO STA. 847 ONLY. SIGN OFF FOR CORRECTIVE ACTION #8.;[10] FAULT C/W

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