If you are terminating these LOCs due to delinquency or default on the account you do not need to send an AAN. See the definition of adverse action at 202.2(c).
However, if you are denying a request to renew the LOCs then the AAN requirements of 202.9 apply. They would also apply if you are reviewing the LOCs for renewal and are denying the renewal based on some other adverse reason.
The opinions expressed are mine and they are not to be taken as legal advice.