Part catalog
To prevent fatigue cracks in certain vertical beam webs (AD paragraph i). OPEN CSN Replace the Vertical Beams at BL 5,7 & BL 17,0 of BS 178. x 50000 CSN 20522 AD Status is OPEN, must be performed the Terminating Preventive Modification i/a/w SB B737-53A1225 R
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