MD Helicopters MD 500 / Hughes 500

Updated: October 2026 – A small helicopter darts low over an airfield, nose down, the rotor turning in a strikingly small circle, and the fuselage looks like an egg with a tail: that is very likely an MD 500. Known under many names – Hughes 369, OH-6 Cayuse, Hughes 500, Little Bird – it is one of the most distinctive light helicopters of all. Here you will learn how the type came about, how to tell the versions apart and where you can meet it today.

What is the MD 500?

The MD 500 is a single-engine light helicopter with a turboshaft engine, skid landing gear and room for up to five people including the pilot. Its trademark is the compact, egg-shaped fuselage pod from which a short, slim tail boom projects. The main rotor is small compared with other types but has four to six narrow blades. This combination makes the helicopter exceptionally agile and compact – which is exactly why police forces, special forces, film crews and aerial work operators value it.

The family has grown over six decades. The most important lines at a glance:

• OH-6A Cayuse – the original military version of the US Army, nicknamed “Loach”
• Hughes 500 / 500C – the first civilian production version with a four-blade rotor
• 500D and 500E – more powerful, with a five-blade rotor and T-tail, the 500E with a pointed nose
• 530F – the most powerful version for high altitudes and heat
• 520N and 530N – NOTAR versions with no tail rotor at all
• MH-6 and AH-6 Little Bird – versions for US special forces
• MD 500 Defender – armed export versions for armed forces
• MD 564 – the latest development stage with a six-blade rotor

In trackers, the classic versions with a tail rotor run under the ICAO code H500. Behind the type originally stood Hughes Helicopters, the helicopter company of the industrialist Howard Hughes. In 1984, McDonnell Douglas took over the company, and after the merger with Boeing, the civilian helicopter lines went in 1999 to the independent company MD Helicopters, based in Mesa, Arizona. If you are interested in the second famous Hughes project, read on in the article Hughes H-4 Spruce Goose.

From the Army competition to record-setting helicopter

The story begins in 1960. The US Army was looking for a successor to the piston-engine Bell H-13 Sioux helicopter – the military version of the Bell 47 – and announced a competition for a Light Observation Helicopter, LOH for short. The requirement was a light, fast observation helicopter with a turbine. About a dozen companies applied, and the shortlist finally included Bell, Fairchild-Hiller and Hughes.

Hughes bet on a radically compact concept: the Model 369 packed crew, turbine and fuel into a small, teardrop-shaped pod. The prototype flew on February 27, 1963. In May 1965, Hughes received the production order, and in 1966 the OH-6A Cayuse joined the troops. The program abbreviation LOH quickly became “Loach” in soldier slang – a nickname that clings to the type to this day. About 1,420 OH-6As were built.

Still in the year of entry into service, the OH-6 showed what it was made of: in 1966 it set 23 world records for helicopters. Two of them still stood even decades later.

The success had a catch, though: when the Army reopened the procurement in 1967, Bell undercut with the OH-58 Kiowa, a military version of the Bell 206 JetRanger. Of all types, the one that had lost the first competition got the follow-on order.

Hughes 500: the leap into the civilian world

In parallel with the military version, Hughes developed a civilian variant. The Hughes 500 received its certification in 1966 and was delivered from 1967. The widespread 500C flew with an Allison 250-C18B with about 317 shp and, with its turbine, was better suited to hot regions and high altitudes than many piston helicopters of its time.

Over the years, ever more powerful versions were added:

• 500D (from 1976): more powerful turbine with about 420 shp, new five-blade main rotor and T-tail; a four-blade tail rotor as an option
• 500E (from 1982): successor to the 500D with a tapering pointed nose and more head and leg room in the cabin
• 530F (certified 1984): “hot and high” version with about 650 shp and a slightly larger rotor

After McDonnell Douglas took over Hughes Helicopters in January 1984, the models were renamed MD 500. License production took place at Kawasaki in Japan, among others, where 387 aircraft were built for military and civilian customers, and at Breda Nardi in Italy, whose NH-500s served with the Guardia di Finanza, among others.

NOTAR: the helicopter without a tail rotor

The probably most unusual members of the family are the NOTAR versions. NOTAR stands for “No Tail Rotor”. Instead of a tail rotor, a fan in the fuselage creates an airflow through the tail boom. Slots in the boom and a rotating nozzle at the end provide the side force that counteracts the torque of the main rotor and with which the pilot steers the helicopter around the vertical axis.

The MD 520N first flew on May 1, 1990, and was certified on September 13, 1991. The 530N later followed as the NOTAR version of the 530F. Advantages of the system: no open tail rotor that can endanger people on the ground, and a clearly quieter presence – one reason some US police agencies went for it.

For you as a spotter, the NOTAR version is a stroke of luck: it is recognizable at a glance. The tail boom is thicker, and at the end instead of a rotor sits a cylindrical nozzle, flanked by two small end fins. How to gauge the rarity of such a sighting is explained in the article How rare is my sighting?.

Little Bird: the special forces version

After the failed attempt to free the US hostages in Iran in 1980, Operation Eagle Claw, the US Army built up specialized helicopter forces. For covert operations in cities, it needed something small, fast and agile – and turned to the OH-6A. This produced the MH-6 as a transport, in which soldiers ride on bench seats on the outside of the fuselage, and the AH-6 as a lightly armed support version. Together they are called the Little Bird.

The operator is the 160th Special Operations Aviation Regiment of the US Army. Over the years, the Little Birds were modernized several times, among other things with a newer cockpit and a more powerful turbine.

For armed forces of other countries, Hughes and later MD offered the armed export versions under the name MD 500 Defender. Military versions of the 500 family flew and fly in Latin America, Asia and Africa, among other places, such as in Kenya, the Philippines and El Salvador. In Finland, the Utti Jaeger Regiment uses helicopters of this family. How to follow military helicopters online is covered in the guide Tracking military aircraft; the serial numbers of US aircraft are explained in the article US military serials.

The three features that are enough to identify it

The MD 500 is one of those helicopters you recognize from the silhouette alone, even from a great distance. Three looks usually suffice.

For the version, it is worth looking at the details. A round nose points to the OH-6, 500C or 500D, a pointed nose to the 500E, 530F and later models. The T-tail only exists from the 500D. The final certainty comes from the registration. Many MD 500s carry US N-numbers, whose system is broken down in the article US N-numbers explained.

MD 500, Bell 206, H120 or Robinson?

In the segment of small skid helicopters, some types look alike at first glance. The finder helps you narrow it down.

For more depth, the pages on the Bell 206 JetRanger, the Airbus H120, the Airbus H125 and on the Robinson R44 and Robinson R66 are worthwhile. The guide Recognizing helicopter types gives you an overview of all common rotorcraft.

Aerobatics, airshows and the Flying Bulls

Thanks to its short rotor and short tail, the MD 500 is considered particularly agile. At airshows, you therefore like to see it in dynamic demonstrations by military and police teams, in the US also as the Little Bird in armed forces demonstrations.

Many fans, by contrast, associate real helicopter aerobatics with loops and rolls with the Flying Bulls of Salzburg. A close look is worthwhile here so you log the sighting correctly: according to the official Flying Bulls fleet list, their aerobatic displays are flown with the Bo 105, which is considered a helicopter civilly certified for aerobatics. An MD 500 is not part of the current fleet. Alongside it in Salzburg stand a Bell AH-1 Cobra and a Bell 47, among others. You can visit the collection at Hangar-7 Salzburg, and you will find the matching location for photos under Hangar-7 at Salzburg Airport.

An overview of the continent’s display teams is given in the article Europe’s aerobatic teams, and how to get displays well into the frame is covered in the guide Photographing airshows.

Where you will find the MD 500 today

Most of the roughly 4,700 aircraft built are registered in North America. There, police and sheriff agencies, aerial work operators, film and photo companies and private owners use the type. In central Europe, the MD 500 is clearly rarer than the Écureuil, the JetRanger or the Airbus twins – so every sighting here is a small catch.

USA: At heliports, small airfields and with police units, especially in the South and West. The special forces’ Little Birds show up occasionally at airshows and exercises.

Italy: Through the license production at Breda Nardi, NH-500s went to agencies like the Guardia di Finanza. Whether and where they still fly is best checked before a visit using current sighting reports.

Germany, Austria, Switzerland: Sporadically with private operators and aerial work companies, occasionally at fly-ins and air days.

Place	Chance of a sighting	Why
Heliports and police units in the US	high	Large civilian and agency fleet
Italian agency bases	low to medium	License-built NH-500, fleet in flux
Airshows with military participation	medium	Defender and Little Bird in displays
Large commercial airports in central Europe	low	Only ferry flights or aerial work

Many MD 500s transmit ADS-B data, but reception is often patchy at low altitude. Tips on how to find helicopters on the tracker anyway are collected in the article Tracking helicopters on flight trackers.

Photo tips especially for the MD 500

The small rotor disc with many blades turns fast. That is good for you: even at moderate shutter speeds, the rotor disc visibly blurs. Still, as with any helicopter, shutter speeds that are too short freeze the blades and make the aircraft look like a model.

The technique is similar to that for propeller aircraft; you will find details in the guide Photographing propellers: the right shutter speed. In Planetrack, the sun position planner for your spot shows you when the light is right. General tips on rotorcraft are collected in the article Helicopter spotting.

The MD 500 in the context of the Hughes family

Hughes Helicopters left two big legacies. One is the 500 family, the other the AH-64 Apache attack helicopter, which Hughes developed for the US Army and which was built on after the takeover at McDonnell Douglas and later Boeing. The 500s are powered by turbines of the Allison 250 line, which today belongs to Rolls-Royce – the same engine family is also in the Bell 206.

If you want to see helicopter history up close, the Helicopter Museum Bückeburg offers a broad cross-section of rotorcraft development. As a small contrast program in the light class, a look at France’s Guimbal Cabri G2, a piston-engine two-seater with a fenestron, is worthwhile.

Common mix-ups and how to rule them out

Conclusion

The MD 500 is proof that a helicopter does not have to be big to make history. From the Army competition of the early 1960s came a record holder, a civilian classic, a special forces tool and, with the NOTAR version, even a technical detour. Egg shape, short boom and a small multi-blade rotor make it unmistakable – and because it is rare in central Europe, every spotter here is happy about a sighting. If you are just getting started, the guide Plane spotting for beginners will get you on course quickly.