Well, the TNI did deploy the KRI U.H., the official reason being that the ship has capabilities for searching for the QZ8501.
Mindef issued a statement on KRI Usman Harun’s deployment:
"Singapore offered its help for this humanitarian effort arising from a tragic accident of AirAsia flight QZ8501 which has befallen our Indonesian neighbour. We offer our deepest condolences to the bereaved families of the passengers and crew. The SAF will continue to assist in this search effort professionally.”MINDEF studiously avoided mentioning the KRI U.H. name. Merely stated our continued participation professionally. Perhaps implying the Indonesians are lacking?