Engineering:UTVA 75

UTVA 75
Serbian Air Force Utva 75
Role	Military trainer/general aviation
National origin	Yugoslavia
Manufacturer	UTVA
First flight	19 May 1976
Introduction	1978
Retired	1995 Slovenian Air Force and Air Defence , North Macedonia 2003 Air Force and Anti-Aircraft Defence of Bosnia and Herzegovina , 2007 Croatian Air Force 2012 Montenegrin Air Force
Status	Retired
Primary user	Yugoslav Air Force
Produced	1978–1985
Number built	136

Slovenian Utva-75

Bosnian Utva-75

Utva-75 Serbian air force

Utva-75 Serbian RViPVO

Montenegrin Air Force Utva 75

Montenegrin Utva-75

Utva Sova - further development of the aircraft

The sole SAFAT 03, developed from the UTVA 75.

The UTVA 75 is a compact, low-wing monoplane, piston-engine aircraft manufactured by UTVA. It was mainly used as a military basic trainer and sporting aircraft. Utva 75 aircraft were involved in more than 40 accidents due to various defects. Today, most of the aircraft are decommissioned.

Development

The Utva 75 made its maiden flight in 1976. Between 1978 and 1985, a total of 136 Utva 75s were produced for the former Yugoslav Air Force. Following the breakup of Yugoslavia, many were passed on to successor states.

Design

Designed in 1975 to replace the UTVA Aero 3 as the primary basic trainer in the Yugoslav Air Force . Utva 75 is a low-wing all-metal utility airplane. Wings are cantilever, rectangular with main and auxiliary wing spar and the integral fuel cells located between them. Dihedral is 6 degrees, NACA65 415 wing section.There is one underwing hardpoint on each wing for drop tanks carriage or additional weapon stores. Landing gear is non-retractable with oleo-pneumatic shock-absorbers. It features upward opening gull-wing type access doors to the two-seat side-by-side cockpit. Another characteristic is a row of air scoops, presumably for cockpit ventilation, in the central front frame of the cockpit. The positions of the throttle and RPM levers are changed, which is leading to confusion, in all western aircraft there is a throttle on the left, and RPM on the right on Utva 75 it is exactly the opposite. The cabin doors have a poorly designed closing system, resulting in many doors shattering due to inadvertent opening in the air. However, the aircraft has one of the better suspension systems and even hard landings will turn out soft.

Operational history

The aircraft was operated in the Yugoslav Air force as a basic trainer and it was given in parallel operational use by aeroclubs for the needs of basic training of reserve officers, maintenance of pilot training in the army reserve, air pick-up of mail with anchor, towing gliders and general aeroclub use. The aircraft has proven to be robust but economically very inefficient, maintenance is very expensive for a two-seater aircraft and also fuel consumption is high. It is estimated that the long-term costs are 150% higher than on the Cessna 152. The aircraft flies very slowly, around 160 km/h with a fuel consumption of around 45 liters per hour. When towing gliders, fuel consumption reaches 55-60 liters per hour.

Accidents

Utva 75 aircraft were involved in more than 40 accidents in the territory of Yugoslavia, outside of Yugoslavia the number is even higher.

• 1989 Montenegro, Ivangrad, instructor and student skidded the plane at too low an altitude and died
• 1989 Slovenia, Divača, the pilot overturned the plane at a low altitude and entered a spin
• 1990 Serbia, Kragujevac, plane crashed with fatal outcome
• 1998 Serbia, Crkvine, the pilot overturned the plane at a low altitude and entered a spin, both people on board died
• 1998 Montenegro, Kolasin, the plane crashed, both people died
• 2000 Serbia, the pilot overturned the plane at a low altitude and died
• 2003 Serbia, Kraljevo, the pilot received fatal burns due to a fire on a plane
• 2009 Slovenia, Izlake, the pilot entered a low-altitude vortex, and the pilot and passenger died

Variants

UTVA 75A11

Single-seat agricultural aircraft, largely using the Utva 75 airframe.

UTVA-75A21

Two-seater with dual controls and provisions for blind instrument flying.

UTVA-75A41

Four-seater with advanced avionics, first flown in 1986.

SAFAT 03

A development of the UTVA 75 from the SAFAT Aviation Complex at Khartoum, Sudan, with a modified fuselage and tail fin. To confuse matters the Sudanese Government marked up a standard UTVA 75 as a SAFAT 03. One example known, which was displayed at the Dubai Air Show in 2011.

Operators

Sudan

• Sudanese Air Force

Former operators

Yugoslavia

• Yugoslav Air Force → partially handed over for use to aeroclubs

Slovenia

• Slovenian Air Force and Air Defence → handed over entirely to aeroclubs for use
• Letalski center Maribor Civil operator (1989-2022)

Croatia

• Croatian Air Force

Template:BiH

• Air Force and Anti-Aircraft Defence of Bosnia and Herzegovina

Serbia

• Serbian Air Force and Air Defence

Montenegro

• Montenegrin Air Force

North Macedonia

• North Macedonia Air Brigade

Specifications (UTVA 75A21)

Data from Jane's All the World's Aircraft 1988-89

General characteristics

• Crew: 2
• Capacity: 210 kg (460 lb) max
• Length: 7.11 m (23 ft 4 in)
• Wingspan: 9.73 m (31 ft 11 in)
• Height: 3.15 m (10 ft 4 in)
• Wing area: 14.63 m² (157.5 sq ft)
• Aspect ratio: 6.5
• Empty weight: 685 kg (1,510 lb) equipped
• Max takeoff weight: 960 kg (2,116 lb)
• Fuel capacity: standard:160 L (42 US gal; 35 imp gal): with drop tanks 360 L (95 US gal; 79 imp gal)
• Powerplant: 1 × Lycoming IO-360-B1F 4-cyl. air-cooled horizontally-opposed piston engine, 134 kW (180 hp)
• Propellers: 2-bladed Hartzell HC-C2YK-1BF/F7666A variable-pitch metal propeller

Performance

• Maximum speed: 215 km/h (134 mph, 116 kn)
• Cruise speed: 165 km/h (103 mph, 89 kn)
• Stall speed: 95 km/h (59 mph, 51 kn) flaps up at idle

82 km/h (51 mph; 44 kn) 25° flap at idle

• Never exceed speed: 270 km/h (168 mph, 146 kn)
• Range: 800 km (500 mi, 430 nmi)
• Ferry range: 2,000 km (1,200 mi, 1,100 nmi)
• Service ceiling: 4,000 m (13,000 ft)
• g limits: +4.4 -2.2
• Rate of climb: 4.5 m/s (890 ft/min)
• Takeoff distance to 50 ft (15 m): 501 m grass at Sea Level
• Landing distance from 50 ft (15 m): 450 m grass at Sea Level

Armament

• Hardpoints: 2 with a capacity of 150 kg (330 lb) each,with provisions to carry combinations of:
  • Rockets: 2x RL 128-02 128 mm (HVAR-5) or 2x rocket launcher with 12 rockets 57 mm
  • Bombs: 2x 120 kg bombs or 4x 50 kg bombs
  • Other: 2x MAC-AA-52 container with 7,62 mm or 2x cargo container 100 kg capacity or 2x drop tanks

' Avionics

• standard (model 75) KING KR85 ADF and KING KY 195B
  
• optional (model 75A catalog only) KING KR87 ADF, RNAV KING KNS81 VOR/LOC: KING KN 53, KING KY 197 Indicators: HSI KING KI 525A, and RMI KING KI 229, DME:KING KN 62A, Transponder: KING KT 79, Audio panel: KING KMA 24

See also

• Utva 66

Aircraft of comparable role, configuration and era

• Zlin Z 142