Service History
Since entering serial production in 2013, the G-120TP has carved out a significant niche in military pilot training across four continents. Over 100 aircraft have been delivered to seven global customers, establishing the type as a preferred choice for air forces seeking modern turboprop trainers. The Indonesian Air Force became the launch customer in September 2011, ordering 18 aircraft with the first entering service in April 2017. Argentina followed as the second operator, taking delivery of their first four aircraft in June 2013 as part of a 10-aircraft order.
The most substantial recent order came from the Bangladesh Air Force, which contracted for 24 aircraft in June 2021. The first dozen arrived on 15 December 2021, with complete delivery accomplished by 2022, including establishment of local repair workshops. Sweden's selection of the G-120TP as their SK 40 basic trainer in 2021 represented a significant European endorsement, with 10 aircraft ordered initially and three additional units contracted in October 2024.
The Manufacturer
Grob Aircraft traces its origins to 1971 when it was founded in Tussenhausen-Mattsies, Bavaria. The company pioneered all-composite aircraft construction, becoming the first manufacturer worldwide to produce entirely composite airframes. By the time of the G-120TP's development, Grob had delivered over 4,500 aircraft that accumulated more than seven million flight hours, initially focusing on gliders before expanding into powered aircraft and trainers.
The company weathered significant challenges in the 2000s, including the fatal crash of their G180 SPn prototype on 29 November 2006, which killed chief test pilot Gérard Guillaumaud. Financial difficulties led to creditor intervention in 2007 and the transfer of some program rights to Allied Aviation Technologies by 2009. However, Grob Aircraft reemerged with renewed focus on military trainers, introducing the G-120TP concept in 2010. Today the company operates as Grob Aircraft SE, continuing production from their original Bavarian facility.
Engine & Technical Innovation
The heart of the G-120TP's performance lies in its Rolls-Royce M250-B17F turboprop engine, delivering 340 kW (456 shp) at takeoff and 283 kW (380 shp) for maximum cruise power. This powerplant drives a five-blade Mühlbauer MT5 composite propeller, providing the thrust necessary for the aircraft's demanding aerobatic training mission. The engine selection reflects decades of M250 series reliability, with thousands of these turboprops serving across various aircraft types since the 1960s.
Grob's engineering team developed the G-120TP by combining the proven G 120A fuselage with lessons learned from their abandoned four-seat G140TP project. The design incorporates retractable tricycle landing gear, a low-mounted tailplane, and movable seats with adjustable rudder pedals to accommodate helmeted military students. Air conditioning and dual thrust levers enhance the training environment, while the carbon fiber reinforced plastic construction provides exceptional strength-to-weight ratio.
Development & Testing
The G-120TP development program began with a proof-of-concept aircraft based on a modified G 115TA airframe, which achieved first flight on 25 May 2010 from Mattsies airfield. This initial flight validated the basic design concepts before construction of the first true prototype, which flew on 1 August 2012. The 20-month gap between proof-of-concept and prototype flights reflected extensive engineering refinement to meet the demanding military training requirements.
EASA certification under CS-23 standards was achieved in May 2013, clearing the way for serial production to commence the same year. The certification process validated the aircraft's +6/-4g load capability and 15,000+ flight hour service life, essential parameters for intensive military training operations.
Training Capabilities
The G-120TP was specifically engineered to expand military pilot training syllabi by combining basic instruction with aerobatic capability in a single platform. This design philosophy allows air forces to conduct complete primary training programs without requiring separate aircraft types for different phases. The tandem seating arrangement places the instructor pilot in the rear position with full flight controls, maintaining visual contact with the student while providing comprehensive oversight.
The aircraft's 360-liter fuel capacity supports extended training sorties, while the robust composite airframe withstands the repeated stress cycles inherent in military pilot training. The turboprop powerplant provides jet-like operating procedures and performance characteristics, better preparing students for transition to advanced trainers and operational aircraft.
Current Operations & Legacy
As of 2024, production continues at the Grob facility in Bavaria, with recent deliveries including the first three Swedish Air Force aircraft in April 2023. The ongoing production run and expanding customer base demonstrate the G-120TP's success in meeting modern military training requirements. With over 100 aircraft delivered and multiple operators conducting daily training flights, the type has established a strong safety record while advancing composite construction techniques in the trainer category.
The G-120TP represents the evolution of military pilot training toward more capable, durable platforms that can handle complete training programs from basic flight instruction through advanced aerobatic maneuvers, setting new standards for single-engine turboprop trainers in the 21st century.