Service difficulty report · Cargo Track · Boeing 73776Q

Difficulty date
April 14, 2023
Submitted
May 9, 2023
Operation
Air carrier
Aircraft
N551WN
Make and model
Boeing 73776Q
Aircraft serial
30280
Aircraft time
66,624 hours, 41,198 cycles
Part
Cargo Track
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 TRACK AT ACB BS787+12 RBL14 WL157.<FOUND TO OUT OF LIMITS ORIGINAL MATERIAL .070 REMAINING MATERIAL .060 ALLOWABLE DAMAGE LIMITS IS .007.;[13] UPDATED CORRECTIVE ACTION 5. REMOVED NUTPLATE PER B737-700 SRM 51-40-02-0G-0.;[14] OBTAINED LOCATED AND DRILLED NEW ACB TRACK BS 747 + 12 TO BS 887 RBL 14 WL 157 IAW SRM 51-40-05 AND DWG # 146A7501 ; OK TO INSTALL;[15] INSTALLED ACB TRACK BS 747 + 12 TO BS 887 RBL 14 WL 157 IAW SRM 51-40-02-0G-0 AND DWG#146A7501.;[16] VERIFIED CORRECTIVE ACTION 14 AND 15.;[17] VERIFIED APPLICABILITY SRM 53-00-53-1A-2 ALLOWABLE DAMAGE 2 - FORWARD AND AFT CARGO COMPARTMENT FLOOR STRUCTURE;[18] UPDATE TO STEP 12; REMOVED CARGO TRACK DUE TO AFTER EVALUATION WAS FOUND OUT OF LIMITS IAW SRM 51-40-02-0G-0.;[19] UPDATE REFERENCE USED ON EVALUATION.<BR>EVALUATED CORROSION ON TRACK AT ACB BS787+12 RBL14 WL157 PER B737-700 SRM 53-00-53-1A-2 ALLOWABLE DAMAGE 2 FOUND TO OUT OF LIMITS ORIGINAL MATERIAL .070 REMAINING MATERIAL .060 ALLOWABLE DAMAGE LIMITS IS .007.;[20] VERIFIED CORRECTIVE ACTIONS 10; 11; 12; 17; 18; 19; AND MEASUREMENT TABLE.

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