HAL HTT 40 Gets Engine Supply Boost Ahead of IAF Delivery

Hindustan Aeronautics Limited is preparing to hand over the first batch of three HTT 40 basic trainer aircraft to the Indian Air Force, with engine supplies from US based Honeywell helping the programme move forward. Two of the aircraft have been built in Bengaluru and one at HAL's Nashik facility.

The HTT 40 programme had faced delays because of the late supply of its TPE331 12B turboprop engines. The first batch of engines has now reached India, allowing HAL to plan a faster production schedule. The government has approved the purchase of 70 HTT 40 aircraft for ₹6,838 crore.

HTT 40 to strengthen pilot training

The HTT 40 is designed for the initial flying training of IAF pilots. Its induction will give the Air Force a domestic option alongside the Pilatus PC 7 MkII aircraft currently used for basic training.

The 70 aircraft order was approved around three years ago. HAL had initially planned to deliver 12 aircraft during FY26, but engine availability affected the production schedule. With the supply issue easing, the company is now preparing to increase output.

Honeywell engine supply resumes

The TPE331 12B turboprop engine has been one of the main factors affecting the HTT 40 production timeline. HAL and Honeywell had entered into an agreement worth around $100 million for the supply and production arrangement covering 88 engines and related equipment.

Under the arrangement, Honeywell was to directly supply 16 engines, while the remaining engines were planned for production in India through technology transfer. The first engine deliveries were earlier expected in September 2025 but were delayed due to global supply chain issues.

The arrival of the first batch gives HAL a clearer path to increase aircraft production.

HTT 40 production in Bengaluru and Nashik

HAL is using both its Bengaluru and Nashik facilities for the HTT 40 programme. The Nashik division has become an important part of the company's aircraft manufacturing plans alongside its existing Bengaluru operations.

A dedicated production line for the HTT 40 and LCA Mk1A was inaugurated at Nashik last year. With both facilities involved, HAL has developed the capacity to produce around 20 HTT 40 aircraft each year.

Regular engine supplies will now be important for HAL to maintain this production rate and speed up deliveries to the Air Force.

What makes the HTT 40 important?

The HTT 40 is a two seat turboprop trainer designed for basic flight training. It has a modern glass cockpit and zero zero ejection seats for the instructor and trainee pilot.

The aircraft can reach a maximum speed of around 450 kilometres per hour and has been certified for aerobatic flying and instrument based training. This allows trainee pilots to gain experience before moving to more advanced aircraft.

How HTT 40 fits into IAF pilot training

Pilot training in the Indian Air Force takes place in stages. Candidates first undergo basic flying training before moving towards fighter aircraft, transport aircraft or helicopters.

For fighter pilots, training progresses through aircraft such as the PC 7 MkII and Kiran Mk1A before they move to the Hawk Advanced Jet Trainer. The HTT 40 is intended to strengthen the basic training stage of this pipeline.

For HAL, the programme also expands domestic aircraft production capacity. For the IAF, the regular availability of HTT 40 aircraft could help strengthen its initial pilot training infrastructure while reducing dependence on imported basic trainers.