Service difficulty report · Support · Boeing 73776N

Difficulty date
February 1, 2022
Submitted
February 22, 2022
Operation
Air carrier
Aircraft
N7725A
Make and model
Boeing 73776N
Aircraft serial
32671
Aircraft time
50,724 hours, 25,358 cycles
Part
Support
Condition
Corroded
Location
Fwd Cargo
Stage of operation
UK
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 FLOOR TO SIDEWALL SUPPORT AT FWD CARGO BAY BS 500A - 500D RBL23. EVALUATED FLOOR TO SIDEWALL SUPPORT AT FWD CARGO BAY MEASURES= L= 1'; W=600'; D= 0.011'; ORIGINAL MATERIAL THICKNESS=0.040'; MATERIAL LOSS=0.011'; REMAINING THICKNESS=0.029'. SIDEWALL SUPPORT IS OUT OF LIMITS. IAW SRM 53-00-53-1A-2, ALLOWABLE DAMAGE 2; STEP 4.A(2)(A). REMOVED FLOOR TO SIDEWALL SUPPORT AT FWD CARGO BAY IAW SRM 51-40-02-0G-0. FABRICATED FLOOR TO SIDEWALL SUPPORT. LOCATED, DRILLED, & APPLIED A CHEMICAL CONVERSION COATING IAW SRM 51-40-05 SRM 53-30-53-0I-2 & SRM 51-20-01. APPLIED PRIMER TO THE FLOOR TO SIDEWALL SUPPORT IAW SOPM 20-44-04. INSTALLED FLOOR TO SIDEWALL SUPPORT IAW SRM 51-40-02; DWG 143A7500.

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