Service difficulty report · Spar · Boeing 7377H4

Difficulty date
August 27, 2019
Submitted
March 18, 2022
Operation
Air carrier
Aircraft
N420WN
Make and model
Boeing 7377H4
Aircraft serial
29825
Aircraft time
61,359 hours, 36,009 cycles
System (JASC)
5711 · Wing Spar
Part
Spar
Condition
Corroded
Location
Left 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

LEFT WING REAR SPAR BOOST PUMP TANK 1 AFT HAS CORROSION AT LOWER BONDING JUMPER IFSS 145 8.5' FROM LOWER CHORD / REMOVED CORROSION ON L/H WING REAR SPAR BOOST PUMP AT LOWER BONDING JUMPER ATTACH POINT IFSS 145 IAW SRM 51-10-02-0G-0. VERFIED ALLOWBLE LIMITS; ORIGINAL .685' LOSS .112' REMAINING .573' OUT OF LIMITS IAW SRM 57-20-10-1A-3. REPAIRED REAR SPAR WEB AT BOOST PUMP BONDING JUMPER ATTACH POINT IAW AAR EA 190735 IR AND SWA EA 1-757-16540 REV IR.

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