Service difficulty report · Stiffener · Boeing 7377H4

Difficulty date
May 14, 2021
Submitted
June 30, 2021
Operation
Air carrier
Aircraft
N400WN
Make and model
Boeing 7377H4
Aircraft serial
27891
Aircraft time
66,325 hours, 39,077 cycles
Part
Stiffener
Condition
Cracked
Location
Horizontal 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

R/H STAB. INSPAR RIB NO. 4 AT STAB STA 120.30 STIFFENER NO. 3 WITH A CRACK ; / [01] CUTOUT DAMAGE AT R/H STAB.RIB 4 STIFFENER #3 AS PER REF B737-700 SRM 55-10-09-2R-4; [02] VERIFIED CUTOUT DAMAGE AT R/H STAB. RIB 4. PENDING N.D.T; [03] PERFORMED HFEC INSP. ON REWORK AREA AT R/H STAB. RIB 4 STIFFENER #3 WEB IAW B737 NTM PT6 51-00-00 PROC. 23. NOTE: CRACK CONFIRMED LATE ENTRY-PERFORMED CUTOUT ON WEB AT R/H STAB.RIB#4 STIFFENER#3 AS PER REF B737-700 SRM 55-10-09-2R-4; [07] VERIFIED CUTOUT ON WEB AT R/H STB. RIB #4 STIFFENER #3; OK TO LOCATED AND DRILL THE REPAIR PARTS FIGURE202/REPAIR 4; [08] LOCATED AND DRILLED PARTS REPAED AS PER REF B737-700 ARM 55-10-09- 2R-4; [09] VERIFIED LOCATION OF DRILLED HOLES ON RIB #4 STIFFENER #3; OK TO INSTALL PART REPAIR; [10] INSTALLED PART REPAIR AT RIB #4 STIFFENER #3 AS PER REF B737-700 SRM 55-10-09-2R-4 INSPECTED INSTALLATION OF PARTS AT R/H STB. RIB #4 STIFFENER #3;

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