Service difficulty report · Doubler · Boeing 7377H4

Difficulty date
April 1, 2022
Submitted
May 2, 2022
Operation
Air carrier
Aircraft
N7731A
Make and model
Boeing 7377H4
Aircraft serial
32677
Aircraft time
50,119 hours, 25,184 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 LEFT HORIZONTAL STABILIZER LOWER SKIN AT STAB STA 193.90 ; 10' FROM REAR SPAR ;I/B ROW .CRACK LENGTH : 0.406' CRACK FOUND AT LEFT HORIONTAL STABILIER LOWER SKIN AT STAB STA 193.90 10' FROM REAR SPAR I/B ROW .CRACK LENGTH : 0.406' / [01] REMOVED FRONT SPAR WEB # 331BZ AS PER B737-7 SRM 51-40-02.;[09] FABRICATED AND LOCATED NEW HOLES AT REPAIR DOUBLER AND FILLER AS PER B737-7 SRM 55-10-01-2R-11; MATERIAL USED 2024-T3 .080' AND .063'.;[10] VERIFIED STEP 9 AND OK TO TREAT AND PRIME;[11] REQUIREMENTS. SURFACE FINISH AT 63; TOOL USED B/C #172331 - TC2D;[12] VERIFIED STEP 11.;[13] TREATED AND PRIMED REPAIR DOUBLER AS PER B 737-700 SRM 51-20-01;[14] VERIFIED STEP 13;[15] OK TO INSTALL REPAIR;[16] INSTALLED DOUBLER REPAIR AT LT. HOR. STAB LOWER SKIN STAB. STA. 193.9 AS PER B737-7 SRM 55-10-01-2R-11.;[17] VERIFIED STEP 16<BR>OK TO RE-INSTALL FRONT SPAR WEB #331BZ;[18] INSTALLED FRONT SPAR WEB #331BZ AS PER B737-7 SRM 51-40-02.;[19] VERIFIED STEP 18 <BR>OK TO TOP COAT REPAIR DOUBLER;[20] APPLIED TOPCOAT AT LOWER SKIN REPAIR DOUBLER AS PER B737-700 AMM 51-21-73-370-801;[21] VERIFIED STEP #20

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