Honeywell Delivers First TPE331-12B Engines to HAL for HTT-40

Honeywell Aerospace Technologies delivered the first three TPE331-12B turboprop engines to Hindustan Aeronautics Limited (HAL) in Bengaluru, India, on June 11, 2026, advancing the Indian Air Force’s HTT-40 basic trainer program after previous supply chain delays.

The handover marks a critical milestone for a $100 million engine contract signed in July 2022. The HTT-40 aircraft is designed to replace the Indian Air Force’s aging Kiran trainer fleet and address pilot training squadron shortages under the Indian government’s ‘Aatmanirbhar Bharat’ (Self-Reliant India) initiative.

Phased delivery and domestic assembly

According to a Honeywell press release, the company will supply a total of 16 engines directly to HAL. Following this initial batch, HAL will assume responsibility for the local assembly of the remaining powerplants, with more than 80 engines planned to support the HTT-40 program over the coming years.

Thandava Edara, Vice President of Engineering and Head of Aerospace Engineering for India at Honeywell Technology Solutions, stated that the collaboration underscores a shared commitment to strengthening local manufacturing, assembly, and long-term support capabilities in India.

The TPE331-12B features a single-shaft design that provides the immediate throttle response required for military pilot training. The broader TPE engine family encompasses 18 models and 106 configurations, accumulating over 122 million flight hours across more than 13,000 global deliveries.

Supply chain recovery and production targets

The June 11, 2026, delivery arrives after persistent supply chain bottlenecks impacted the program’s timeline. Reporting by Defence News India indicates that Honeywell missed an initial September 2025 deadline for the first engine delivery, pushing the timeline into mid-2026.

As a result of the delay, HAL revised its HTT-40 delivery targets in December 2025. The manufacturer reduced its projected output for the 2025-2026 financial year from 12 aircraft down to three units. India’s Ministry of Defence had previously signed a contract with HAL in March 2023 for the procurement of 70 HTT-40 aircraft.

With the first engines now on site, HAL Chairman and Managing Director Ravi K expressed optimism regarding the production schedule. In the Honeywell release, he noted that the deliveries mark a significant milestone for the program and stated confidence that future engine shipments will continue on schedule.

AirPro News analysis

The arrival of the first TPE331-12B engines in Bengaluru provides HAL with the necessary hardware to meet its revised 2025-2026 financial year target of three HTT-40 aircraft. While the initial supply chain delays highlight the vulnerability of domestic aerospace programs to global component shortages, the structured transition toward local engine assembly mitigates long-term risk. We view the successful transfer of assembly capabilities to HAL as the true test of this partnership. If Honeywell can maintain the delivery schedule for the remaining 13 direct-supply engines, HAL will be well-positioned to stabilize the HTT-40 production line and begin fulfilling the Indian Air Force’s critical training requirements.

Sources: Honeywell Aerospace Technologies