Service difficulty report · Flange · Boeing 7377CT

Difficulty date
September 29, 2021
Submitted
October 28, 2021
Operation
Air carrier
Aircraft
N7831B
Make and model
Boeing 7377CT
Aircraft serial
32752
Aircraft time
58,334 hours, 29,483 cycles
Part
Flange
Condition
Corroded
Location
Fuselage
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

RT ECS EXHAUST O/B FLANGE HAS FRETTING CORROSION. BLENDED OUT CORROSION AND MEASURED MINIMUM THICKNESS REMAINING. FOUND OUT OF LIMITS IAW SRM 53-40-71-1A-1, FIG 103, DETAIL C; VIEW A-A. ORIGINAL THICKNESS 0.100'; REMOVED 0.019'; REMAINING 0.081'. REMOVED RT ECS EXHAUST PANEL AND WTB PANEL 192JR FOR ACCESS IAW AMM 53-51-21-000-802. REMOVED CORRODED SUPPORT ANGLE IAW SRM 51-40-02-0G-0. LOCATED & DRILLED FASTENER HOLES IAW SRM 51-40-05-0G-0. TREATED & PRIMED NEW SUPPORT ANGLE IAW AMM 51-21-41-370-801 & 51-21-72-370-804. INSTALLED. NEW SUPPORT REMOVED EN SPTET 2 IAW SRM 51-40-02. INSTALLED PANEL 192JR REMOVED STEP 2 IAW SRM. 51-40-02-0G-0. INSTALLED RT ECS EXHAUST PANEL & PANEL192JR IAW SRM 51-40-02-0G-0.

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