Service difficulty report · Spar · Boeing 7377H4

Difficulty date
August 7, 2021
Submitted
September 14, 2021
Operation
Air carrier
Aircraft
N446WN
Make and model
Boeing 7377H4
Aircraft serial
29842
Aircraft time
58,476 hours, 34,391 cycles
System (JASC)
5711 · Wing Spar
Part
Spar
Condition
Cracked
Location
Rt Wing
Stage of operation
IN
How discovered
V
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 FRONT SPAR ANGLE UPPER POSITION ON BOOST PUMP AREA IFSS 120 APROX AT RT WING ; 2021-342355 / [01] MACHINED ANGLE SUPPORT (1E/A) MATERIAL USED 7050T7451 AMS 4050 IAW 737-700 SRM 57-20-10-1A-3 AND DWG 116A3939 REV B TOOL USED DIGITAL CALIPER P/N 500-193-30 S/N 0000285 DUE DATE 22-NOV-21; [02] STEP 1 VERIFIED; [03] FLUORESCENT PENETRANT INSPECTION PERFORMED ON THE MACHINED SUPPORT ANGLE I.A.W. BAC 5423 AND BSS7039. NO DAMAGES FOUND.; [12] OK TO INSTALL GRANTED RII ACCOMPLISHED; [13] INSTALLED ANGLE SUPPORT; FASTENERS AND SHIM (1E/A) LOCATED UPPER POSITION ON BOOST PUMP AREA IFSS 120 APROX AT RT WING. IAW B737-700 SRM 51-40-02 AND DRAWING # 112A2004 REV. [15] LATE ENTRY: REMOVED ANGLE UPPER SIDE LOCATED ON FUEL BOOST PUMP AREA IFSS 120 APROX AT RT WING IAW B737-700 SRM 51-40-02.; [16] COMPLIED WITH STEP 15 LATE ENTRY: REMOVED ANGLE UPPER SIDE LOCATED ON FUEL BOOST PUMP AREA IFSS 120 APROX AT RT WING IAW B737-700 SRM 51-40-02.[30] REPLACED ANGLE LOCATED ON FRONT SPAR; UPPER POSITION OF BOOST PUMP IFSS 120 APROX AT RT WING I.A.W. B737-700 SRM 51-10-02 PARAGRAPH 9; SRM 51-10-02 AND DRAWING# 112A2004 REV

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