HAL HTT-40
| File:HAL Logo.svg Logo of Hindustan Aeronautics Limited | |
| Company type | Public sector undertaking |
|---|---|
| Industry | Aerospace and defense |
| Founded | December 23, 1940 in Bangalore, India |
| Headquarters | Bangalore , India |
| Products | Aircraft, Helicopters, Aerospace components |
| Owner | Government of India (Ministry of Defence) |
| Website | hal-india |
The HAL HTT-40 (Hindustan Turbo Trainer-40) is a training aircraft developed and manufactured in India by Hindustan Aeronautics Limited (HAL). It has been designed to serve as the primary basic trainer, replacing the retired HPT-32 Deepak in service with the Indian Air Force.
Design and development
The HTT-40 features a tandem seating arrangement and is powered by a turboprop engine. Initially, in early 2012, HAL projected production of 106 units.
However, by mid-2012, the Indian Air Force (IAF) placed an order for 75 Pilatus PC-7 Mk II aircraft to fulfill the training role originally intended for the HTT-40. In September 2012, the IAF officially declined the HTT-40, citing that its unit cost was twice that of the well-established PC-7 Mk II, which was already operational worldwide. A Ministry of Defence (MoD) official acknowledged a readiness to invest more for indigenous development but questioned whether producing a basic trainer domestically was strategically essential.
At that point, HAL neither confirmed nor denied the IAF's decision and did not clarify whether development would proceed. A company spokesperson highlighted that project details are confidential and driven by national interest, with timelines subject to change.
The program formally commenced in 2013 with internal funding from HAL. It took approximately five years for prototypes to undergo spin testing.
Following initial test flights, the IAF chief publicly announced intentions to induct large numbers of HTT-40 trainers.
On 28 February 2015, the MoD approved procurement of 68 HAL HTT-40 aircraft alongside 38 Pilatus trainers as replacements for the existing fleet, citing commercial feasibility.
On 21 June 2015, HAL selected the Honeywell Garrett TPE331-12B turboprop engine for powering the trainer. The contract, finalized on 27 July 2022, includes provision of 88 engines, spare kits, maintenance services, and support valued at over $100 million. Honeywell will partner with HAL to facilitate export opportunities.
The first prototype was unveiled on 2 February 2016 and completed its maiden flight on 31 May 2016.
The HTT-40 made its public flight debut on 17 June 2016 in the presence of Defence Minister Manohar Parrikar. Its second prototype took flight on 19 May 2017.
By July 2019, initial operational clearance was anticipated by year-end, with first deliveries to the IAF expected within a year after order placement. The aircraft successfully passed critical six-turn spin tests and met all Air Staff Qualitative Requirements (ASQRs). Procurement aligns with the "Indian Designed, Developed and Manufactured" (IDDM) framework under the Defence Procurement Policy (2016).
By August 2021, spin certification flight trials had been completed. The platform received a provisional certificate of airworthiness from the Centre for Military Airworthiness and Certification (CEMILAC) on 6 June 2022.
Production
In January 2020, HAL announced plans for limited series production during 2020–21. On 11 August 2020, the Defence Acquisition Council approved acquisition of 106 HTT-40 units for the Indian Air Force. At Aero India 2021, HAL received a request for proposal from IAF seeking 70 HTT-40 aircraft with an option for an additional 38 units to be manufactured at facilities in Bangalore and Nashik.
During DefExpo 2022, HAL and IAF finalized a ₹6,800 crore contract covering procurement of 70 HTT-40 trainers; remaining 36 will be acquired after operational induction along with a potential follow-on order for another 38 units. On 28 July 2022, HAL signed a $100 million agreement with Honeywell Aerospace for supply of 88 TPE331-12B engines and support kits. Thirty-two engines will be delivered directly by Honeywell while the remainder will be produced by HAL under technology transfer arrangements along with manufacturing and repair licenses.
On 6 March 2023, a contract was inked to deliver HTT-40 aircraft and associated equipment to IAF starting September 2025 through March 2029. The first year’s delivery schedule includes twelve aircraft (ten from Nashik and two from Bangalore), followed by annual deliveries of twenty units thereafter (fifteen from Nashik and five from Bangalore). Nashik is emerging as an important production center alongside Bangalore.
A prototype took part in Aero India’s inaugural flypast in 2025. As of September that year, HAL readied for maiden flight of a serial production HTT-40 equipped with a Category B engine due to delayed Honeywell deliveries caused by supply chain challenges. The first engine delivery is anticipated in November with six more expected before fiscal year-end. HAL targets first aircraft delivery by January 2026 followed by eleven additional units by March. Indigenous content begins at approximately 56%, aiming to exceed 60% later.
On 17 October 2025, Defence Minister Rajnath Singh inaugurated HAL’s second HTT-40 production line along with a third Tejas Mk1A line at Nashik; existing lines remain at Bengaluru. The event featured a flying formation including Tejas, Su-30MKI, and HTT-40 aircraft.
The inaugural flight of the first serial production HTT-40 (tail number TH-4001) was successfully completed on 24 October 2025 from HAL Airport in Bengaluru.
Operators
- Indian Air Force — 70 units commissioned