Service difficulty report · Support Angle · Boeing 7377H4

Difficulty date
April 24, 2022
Submitted
May 31, 2022
Operation
Air carrier
Aircraft
N479WN
Make and model
Boeing 7377H4
Aircraft serial
33990
Aircraft time
59,976 hours, 35,850 cycles
Part
Support Angle
Part number
115A375821
Condition
Corroded
Location
Lh Wing
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

CORROSION ** LEFT WING REAR SPAR FIXED T/E LOWER SUPPORT ANGLE BETWEEN FLAP TRACKS # 1 & 2 MKD DOT / [01] REMOVED CORROSION AT L/W REAR SPAR FIXED T/E LOWER SUPPORT ANGLE BETWEEN FLAP TRACKS #1 - 2 IN REF B737-700 SRM 51-10-02-0G-0;[02] VERIFIED STEP 1.;[03] AFTER REMOVED CORROSION AT L/W REAR SPAR FIXED T/E LOWER SUPPORT ANGLE BETWEEN FLAP TRACKS #1 - 2 FOUND OUT OF LIMITS ORIGINAL MATERIAL 0.080';MATERIAL LOSS 0.030' IN REF B737-700 SRM 57-51-02-1A-1;[04] VERIFIED STEP 3;[05] LOCATED AND DRILLED NEW L/W REAR SPAR FIXED T/E LOWER SUPPORT ANGLE BETWEEN FLAP TRACKS #1 - 2 IN REF B737-700 SRM 51-10-05-0G-0;[06] LATE ENTRY :<BR>REMOVED L/W REAR SPAR FIXED T/E LOWER SUPPORT ANGLE BETWEEN FLAP TRACKS #1 - 2 IN REF B737-700 SRM 51-40-02-0G-0;[07] VERIFIED STEPS 5 AND 6. OK TO TREAT AND PRIME AS REQUIRED.;[08] TREATED AND PRIME NEW HOLES AT SUPPORT ANGLE ASPER B 737-700 SRM 51-20-01-0G-0;[09] VERIFIED STEP 8. OK TO INSTALL NEW SUPPORT ANGLE.;[10] INSTALLED NEW SUPPORT ON L/H WING REAR SPAR FIXED LOWER T/E SUPPORT BETWEEN FLAP TRACKS #1 AND #2; PER REF 737-700 SRM 51-40-02-0G-0 AND DRAWING 115A3758;[11] VERIFIED STEP 10.;[12] INSTALLED NEW SUPPORT ON L/H WING REAR SPAR FIXED LOWER T/E SUPPORT BETWEEN FLAP TRACKS #1 AND #2; PER REF 737-700 SRM 51-40-02-0G-0 AND DRAWING 115A3758;[13] VERIFIED STEP 12.

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