After back-to-back incidents on IndiGo’s Airbus 320 (neos), operated by Pratt & Whitney engines, the Directorate General of Civil Aviation ( DGCA ) has asked IndiGo to replace older PW engines in all its 97 aircraft by the end of January.“As you are aware, last one week has witnessed four air turn back/Inflight Shut down and has caused serious concern and resultant disruption. This situation cannot be allowed to go on indefinitely. Therefore, after considerable deliberations, it has been decided that all aircraft in your fleet numbering 97 as on date, need to be placed with modified Low pressure Turbine (LPT) for both the Engines,” said DGCA DG Arun Kumar.“It has been further decided that the operator must ensure that all these Aircraft are provided with modified LPT by 31/1/2020 at all costs. In case, it is not done, such aircraft shall not be allowed to fly with unmodified Engines. You may like to stagger or defer your future induction plan and procure sufficient number of modified Engines to keep the existing fleet in operation,” Kumar further added.These orders are, however, applicable only to IndiGo and not to GoAir, for now.This order for IndiGo is a follow-up of the earlier DGCA order, which had asked bot IndiGo and GoAir – both operates Airbus 320 (neo) with PW engines – to change engines in 16 and 13 of their aircraft, respectively by November 12, 2019.The DGCA has also asked IndiGo to put at least one engine of the aircraft with a newer engine on seven more aircraft.“In continuation of our earlier communication laying down the placement of at least one LPT modified engine on each of the 16 Aircraft (the both engines of which have done more than 2900 FH) in the next 15 days, i.e. by 12th of November 2019, it has been noted that seven more aircraft fall in the similar category and therefore, this be extended to those Aircraft also and to accomplish this, an additional 7 days are allowed. So, the completion of this task is to be achieved latest by 19th of November, 2019,” said Kumar.It added that none of these 23 aircraft, which does not have at least one LPT modified engine on its wings, shall be allowed for commercial operation and their schedule will suitably be curtailed till this is accomplished.