TATA-SIA’s A320-232SL (SL=sharklets), was spotted flying for the first time at Toulouse, France yesterday. The aircraft was flown with a test registration F-WWDT, and the airframe is serial number 6223.

The aircraft is to be registered as VT-TTB. The aircraft will next fly to Hamburg where it will have its cabin fitted in accordance with TATA-SIA’s preferences.

The aircraft is expected in Delhi, India by August 15th, but no later than August 20th.

The airline received its no objection certificate (NOC) from the ministry on April 2nd 2014, and applied for an air operator permit (AOP) on 22nd April 2014. On 9th July 2014, the DGCA decided to consider the AOP application of TATA-SIA, after inviting and reviewing objections and suggestions from the public.

Judging by the pace of developments and clearances at the airline, the AOP is expected by the first half of September. Considering that the Delhi High Court today adjourned the hearing of petitions filed by the Federation of Indian Airlines (FIA) and Subramanian Swamy against TATA-SIA and AirAsia India to September 12th, TATA-SIA may secure its AOP before the court hearing.

Once the AOP is secured, the airline may open for sales in September, and begin operations by end September / early October, subject to timely clearance of flight schedules by the DGCA.

Choice of Power.

Although TATAs have a stake in both TATA-SIA and AirAsia India, the engine chosen by the full service airline is the IAE V2527-A5, unlike the CFM56-5B6 flown by AirAsia. This particular IAE engine is similar to what IndiGo uses on its Airbus A320 aircraft, and has a higher thrust but lower bypass ratio when compared to the CFM56-5B6. As a result, the IAE engines are noisier.

Parameter	CFM56-5B6	IAE V2527-A5
Take off Thrust	104.5kN	110.3kN
Bypass Ratio	5.9:1	4.8:1
Noise*	Lower	Baseline

*Based on FAA data. Quantified comparison omitted here as it’s too exhaustive.

Pratt and Whitney holds majority stake in the IAE venture, which was originally formed between Pratt and Whitney, Rolls Royce, MTU Aero Engines and Japanese Aero Engine Corp now has Pratt and Whitney as the major stakeholder when the United Technologies Corporation engine unit bought out Rolls Royce’s stake in October 2011.

TATA-SIA’s choice of engine was very natural. Singapore Airlines flies Boeing 777s, A380s, and A330s-all powered by Rolls Royce Engines. Singapore Airlines’ subsidiary-Silk Air-flies A320 and A319 aircraft fitted with IAE engines. Tigerair, in which Singapore Airlines has a stake, flies A320s and A319s with IAE engines.

AirAsia’s fleet mostly comprises of the A320-216 (CFM56-5B6 powered).

According to Amit Singh, Director Flight Operations at AirAsia India, the low thrust of the 5B6 translates to maintenance savings. Worldwide, CFM engines have a reputation for reliability and robustness, reportedly better than IAE’s. The CFMs are reported to offer better economics on the A320 and A319.

Although CFM has more than 55% of the classic engine market that powers the A320 aircraft, it has a lower market share in Asia Pacific. In India, presently, 93 Airbus A320 family aircraft are powered by IAE Engines, while 66 are powered by CFM engines. Of the 93 IAE powered A320 aircraft, 78 comprise IndiGo’s fleet.

Edit: Thrust ratings changed to reflect take off thrust as published by EASA.