Service difficulty report · Plate · Boeing 7378H4

Difficulty date
October 23, 2024
Submitted
November 18, 2024
Operation
Air carrier
Aircraft
N8520Q
Make and model
Boeing 7378H4
Aircraft serial
42532
Aircraft time
26,025 hours, 12,954 cycles
Part
Plate
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 COMPARTMENT FLOOR STRUCTURE; LEFT SIDE PLATE HAS SURFACE CORROSION FROM STA 727H-727I AROUND FASTENER HOLES.<[01] MEASURED CORROSION DAMAGE AT AFT CARGO LEFT SIDE SUPPORT ZEE STATION 727H TO 727I; ORIGINAL THICKNESS IS .040?; DAMAGE DEPTH IS .006? AT DEEPEST LOCATION; REMAINING THICKNESS IS .034? AND IS OUT OF LIMITS I/A/W SRM 53-00-53-1A-2.;[02] REMOVED DAMAGE PER SRM 53-00-53-1A-2. AFTER DAMAGE REMOVAL; FOUND DAMAGE REMOVAL WITHIN LIMITS PER SRM 53-00-53-1A-2. MIN REMAINING THICKNESS 0.036?.;[03] VERIFIED. REMOVED DAMAGE PER SRM 53-00-53-1A-2. AFTER DAMAGE REMOVAL; FOUND DAMAGE REMOVAL WITHIN LIMITS PER SRM 53-00-53-1A-2. MIN REMAINING THICKNESS 0.036. SIGN OFF FOR CORRECTIVE ACTION #2.;[04] OK TO ALODINE AND PRIME.;[05] TREATED AND PRIMED DAMAGED AREA PER SRM 53-00-53-1A-2.;[06] VERIFIED. REMOVED DAMAGE PER SRM 53-00-53-1A-2. AFTER DAMAGE REMOVAL; FOUND DAMAGE REMOVAL WITHIN LIMITS PER SRM 53-00-53-1A-2. MIN REMAINING THICKNESS 0.036. SIGN OFF FOR CORRECTIVE ACTION #2.VERIFIED.TREATED AND PRIMED DAMAGED AREA PER SRM 53-00-53-1A-2.

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