ATR-42 vs ATR-72

The ATR 42 and ATR 72 occupy separate tiers within military aviation despite their shared civilian commuter origins. While the baseline ATR 42 functions as a light utility transport for smaller air arms, the stretched ATR 72 operates as a dedicated maritime patrol and anti-submarine warfare (ASW) platform for NATO-aligned navies.

Development and Design

Aérospatiale and Aeritalia launched the ATR 42 in 1981, optimizing it for short austere airstrips with high-wing clearance and a proprietary "Hotel Mode" propeller brake that eliminates the requirement for an auxiliary power unit. The ATR 72 emerged in 1986 as a stretched derivative, adding 4.49 meters to the fuselage. In the military domain, this volume increase shifted the airframe's utility. The ATR 42 remains a roll-on/roll-off passenger and light cargo asset. By contrast, the Leonardo-developed ATR 72MP and ASW variants integrate an Airborne Tactical Observation and Surveillance (ATOS) system, AESA multimode radars like the Seaspray 7300, and defensive aids sub-systems (DASS). The larger airframe provides the physical space to install four operator workstations and systems to manage lightweight aerial torpedoes.

Specifications and Performances

The structural stretch gives the ATR 72 a 22,500 kg Maximum Takeoff Weight (MTOW), a 21% increase over the ATR 42's 18,600 kg limit. To compensate for the heavier gross weight, the ATR 72 utilizes Pratt & Whitney Canada PW127F engines outputting 2051 kW, compared to the 1790 kW on the ATR 42's PW127E. The operational tradeoffs define their deployment profiles:

• The ATR 72 achieves a higher cruise speed (565 km/h vs 556 km/h) and a slightly extended range (1404 km vs 1326 km) due to the higher thrust output.
• The ATR 42 requires less runway (1165 m vs 1223 m), retaining an edge for operations on the shortest austere strips.

Deployment and usage

Military employment strictly divides the two types. The ATR 42 operates primarily in austere, low-intensity utility roles. The Nigerian Air Force fields it for localized logistics, while the Colombian Navy uses it for transport. Myanmar and Senegal fly the type for basic troop movement. Conversely, the ATR 72 executes high-end C4ISR and ASW. The Italian Air Force operates the P-72A for Mediterranean maritime patrol and electronic surveillance. Turkey fields the type in both utility (TMUA) and ASW (TMPA) configurations, localized by TAI. However, the platform faces limitations in high-end ASW competition; the ATR 72 lost Germany's P-3 Orion replacement contract to the Boeing P-8A Poseidon, as the turboprop lacks the transit speed and weapon payload of a modified 737 airframe.

Conclusion

The ATR 72 possesses the absolute advantage for structured military acquisition. The fuselage stretch and 3,900 kg payload increase provide the strict volume requirements for modern ASW and C4ISR operator consoles, radar suites, and acoustic processors. The ATR 42 is constrained by its smaller cabin, restricting it to basic troop transport for developing nations on strict procurement budgets. Navies requiring maritime patrol capability will default to the ATR 72, whereas the ATR 42 remains a civilian commuter repurposed out of economic necessity rather than tactical requirement.