Service difficulty report · Retainer · Boeing 7377H4

Difficulty date
July 12, 2021
Submitted
August 2, 2021
Operation
Air carrier
Aircraft
N962WN
Make and model
Boeing 7377H4
Aircraft serial
36963
Aircraft time
33,006 hours, 20,057 cycles
Part
Retainer
Condition
Corroded
Location
Bs 790
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 BS790 RBL24 WL157 ON NUT PLATE RETAINER / [01] REMOVED CORROSION ON NUT PLATE RETAINER AT BS 790 ; RBL 24 ;WL 157 ; WORK AREA IS 5.0' X 0.900' X 0.005 ; ORIGINAL THICKNESS IS 0.040 ; REMAINING THICKNESS IS 0.035 ; FOUND TO BE OUT OF LIMITS IAW SRM 53-60-15-1A-1 ; STEP 4G; [02] VERIFIED; [03] VERIFIED REMOVAL OF CORROSION ON NUT PLATE RETAINER AT BS 790; RBL 24; WL 157; WORK AREA IS 5.0' X 0.900' X 0.005'; ORIGINAL THICKNESS IS 0.040'; REMAINING THICKNESS IS 0.035'; FOUND TO BE OUT OF LIMITS IAW SRM 53-60-15-1A-1 ; STEP 4. G.; [04] RETRACTING CORRECTIVE ACTION STATEMENT #3 DUE TO CALIBRATED TOOLING NOT DOCUMENTED.; [05] CERTIFYING EDIT.; [06] LOCATED AND DRILLED NEW NUT PLATE RETAINER IAW SRM 51-40-05-0G-0 AND DWG 146A0081; [07] VERIFIED; [08] VERIFIED LOCATING AND DRILLING OF NEW NUT PLATE RETAINER PER SRM AND DWG.; [09] OK TO INSTALL NEW RETAINER AT BS 790 ;RBL 24 ; WL 157; [10] VERIFIED; [11] VERIFIED OK TO INSTALL.; [12] INSTALLED NEW NUT PLATE RETAINER ON BS 790 ; RBL 24 ; WL 157 IAW SRM 51-40-02-0G-0 AND DWG 146A0081; [13] VERIFIED; [14] VERIFIED NUT PLATE RETAINER INSTALL PER SRM AND DWG.

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