Service difficulty report · Doubler · Boeing 7377BD

Difficulty date
July 1, 2022
Submitted
July 25, 2022
Operation
Air carrier
Aircraft
N7749B
Make and model
Boeing 7377BD
Aircraft serial
36724
Aircraft time
39,551 hours, 20,372 cycles
Part
Doubler
Condition
Cracked
Location
L/H Horiz. Stab.
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 FOUND AT LT HORIZONTAL STAB. LWR SKIN STAB STA 184.70 ; 10.5' FROM REAR SPAR I/B ROW. CRACK LENGTH : 0.343' CRACK FOUND AT LT HORIONTAL STAB. LWR SKIN STAB STA 184.70 10.5" FROM REAR SPAR I/B ROW. CRACK LENGTH : 0.343" / [01] REMOVED EXISTING REPAIR DOUBLER NEXT TO CRACKED AREA AND REMOVED EXISTING FASTENERS AROUND CRACKED AREA PER B737-700 SRM 51-40-02-0G-0.[12] STARTED FABRICATION OF [1] MODIFIED SPAR DOUBLER; MATERIAL USED 2024T3.080' PO#1764223; [2] MODIFIED FILLER; MATERIAL USED 2024T3.040' PO#1770163 AND [3] REPAIR FILLERS(2EA); MATERIAL USED 2024T3.063' PO# 1742537 PER EA 22-155-02066-WIP1FIG.1-1.;[13] CONTINUED FABRICATION OF DOUBLER AND FILLERS AS PER EA 22-155-02066-WIP1 FIG.1.1;[14] COMPLETED FABRICATION OF [1] MODIFIED SPAR DOUBLER; MATERIAL USED 2024T3.080' PO#1764223; [2] MODIFIED FILLER; MATERIAL USED 2024T3.040' PO#1770163 AND [3] REPAIR FILLERS(2EA); MATERIAL USED 2024T3.063' PO# 1742537 PER EA 22-155-02066-WIP1FIG.1-1;[15] VERIFIED STEP #14. COMPLETED FABRICATION OF DOUBLER; FILLERS.[21] STARTED INSTALLATION OF THE REPAIR PARTS AT THE REWORKED AREA AS PER B737-700 SRM 51-40-02; SOPM 20-50-19; AND 22-155-02066-WIP1.;[22] VERIFIED STEP 21.;[23] COMPLETED INSTALLATION OF REPAIR PARTS (DOUBLER [1]; FILLER [2] AND FILLERS [3] (2EA)) PER B737-700 SRM 51-40-02; SOPM 20-50-19; AND 22-155-02066-WIP1 FIG 1-1.;[24] VERIFIED PARTS INSTALLATION AND SEALANT APPLICATION.

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