Civil aviation regulator DGCA asked IndiGo not to use such A320 Neo planes which are fitted with PW engines already used for over 3,000 hours. 16 aircrafts in IndiGo's fleet in which both the Pratt and Whitney (PW) engines have been used for more than 2,900 hours. DGCA asked Indigo that all such 16 aircraft have to be fitted with at least one modified LPT engine within next 15 days. In case Indigo fails to do so, these aircrafts will be grounded. Indigo has reported three in-flight engine shutdowns in October on the A320 (Neo) fitted with PW engines. "A meeting was chaired by DGCA later in the day with senior Indigo team members including COO, safety and maintenance heads. Subsequent to the discussions, Indigo has been instructed to ensure that no such Neo aircraft should be operated which has two Pratt and Whitney 1100 series engine of more than 3000 hour's engine life each. Indigo has been given a fortnight to comply with the instructions," a DGCA official said.