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Aircraft in the affected range may have had an under-torqued oil tank quick drain valve from production. The drain valve is safety wired; however, the under-torqued condition could lead to oil leakage, and if left un-checked over time, could lead to engine seizure.

https://www.iconaircraft.com/wp-cont...dc5jul2022.pdf

DATE ISSUED: 04/02/22
DATE EFFECTIVE: 04/02/22
S/N: 126-132, 134, 135, 139, 141, 142
TIME OF COMPLIANCE: Before further flight if there is evidence of oil leaking from the subject drain valve as described in the inspection below. Otherwise, within 5 flight hours as required to ferry the aircraft to an approved maintenance facility for corrective action.