Service difficulty report · Stringer · Boeing 7377Q8

Difficulty date
December 7, 2021
Submitted
April 26, 2022
Operation
Air carrier
Aircraft
N7865A
Make and model
Boeing 7377Q8
Aircraft serial
30647
Aircraft time
54,104 hours, 35,814 cycles
Part
Stringer
Part number
23RH
Condition
Cracked
Location
Fwd Cargo Bay
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

CRACK ON FWD CARGO BAY BS 540 R/H STRINGER 23. ; / [01] EVALUATED CRACK MEASUREMENTS ON FCB BS 540; STR 23RH ; STRINGER DAMAGE FOUND TO BE OUT LIMITS IAW SRM 53-00-03-1A FIG 103.; [02] OUT OF SEQUENCE- VALIDATED ALLOWABLE DAMAGE 1 APPLICABILITY OF SRM SRM 53-00-03-1A TO THIS REPAIR.; [03] CUT AND REMOVED THE DAMAGE SECTION OF STRINGER AT STA 500D+10'; STR-23R I.A.W SRM 51-10-02.; [04] VERIFIED SRM APPLICABILITY AND OUT OF LIMITS. VERIFIED REMOVAL OF THE STR SEGMENT FROM BS500D+10- 540. FABRICATED STRINGER SECTION FROM 7075-T6 0.036' AND HAT SECTION FROM 7075-T6 0.040' <BR><BR>LOCATED AND DRILLED STRINGER SECTION AND HAT SECTION AT STR 23 R/H BS 500D+4' TO 536 AND APPLIED CHEMICAL CONVERSION COATING IAW EA NO: 21-153-03693 REV: A AND SRM 53-00-03-2R-1 PAR. 4 STEPS D TO I. FIG 205 OK TO APPLY PRIMER TO REPAIR PARTS; APPLIED PRIMER ON REPAIR PARTS IAW SRM 53-00-03-2R-1 REPAIR 1 STEP 4; [12] OK TO INSTALL REPAIR PARTS ( NEW STRINGER SECTION AND HAT SECTION); [13] STEP 1;2 AND ACTION 12 OK TO INSTALL; [14] PARTIAL FOR STEPS 1;2; [15] INSPECTED ACTION 11; [16] INSTALLED REPAIR PARTS ( NEW STRINGER SECTION AND HAT SECTION) BTW B/S 500D TO B/S 540 STR 23 R/H IAW SRM 53-00-03-2R-1. REPAIR 1 STEP 4 (K-L) AND ; DWG 143A3250 REV:- AND ER:21153-03693; [17] RII INSPECTED ACTION 16 AND STEPS 1;2'THE DAMAGE WAS REPAIRED PER 737-700 SRM 53-00-03-2R-1 (REPAIR 1) AND EA 21-153-03693'

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