India's aviation regulator has fined Indigo Airlines 3 million rupees ($36,475) after a special audit found deficiencies following a series of tail strike incidents on A321 aircraft this year, the country's civil aviation ministry said on Friday. ($1 = 82.2489 Indian rupees) (Reporting by Sethuraman NR in Bengaluru; Editing by Savio D'Souza)