Service difficulty report · Spar Cap · Cessna 402C

Difficulty date
January 3, 2019
Submitted
January 4, 2019
Operation
Air carrier
Aircraft
N409BK
Make and model
Cessna 402C
Aircraft serial
402C0651
Aircraft time
27,433 hours, 17,751 cycles
System (JASC)
5711 · Wing Spar
Part
Spar Cap
Part number
52111781
Condition
Cracked
Location
Wing
Part time
27,433 hours
Stage of operation
IN
How discovered
U
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

A CRACK WAS IDENTIFIED AT THE LT SIDE OF LWR FWD CARRYTHROUGH SPAR CAP, IB MOST AFT FASTENER HOLE WHILE PERFORMING NDT PROCEDURE AS AMOC FOR AD2018-03-03R1. THE CRACK WAS CONFIRMED WITH BOLT HOLE EDDY CURRENT AFTER THE FASTENER WAS REMOVED. WE BELIEVE THIS SPAR CAP/WING JOINT FITTING ASSEMBLY TO BE UNTOUCHED SINCE ORIGINAL ASSEMBLY BASED ON THE FASTENER STYLE INSTALLED, AFTT, AND RECORDS REVIEW. THE CRACK IS NOT DETECTABLE WITH MAGNIFIED VISUAL INSPECTION. THE SPAR CAP WILL BE REPLACED.

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