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Aerospatiale AS350 Ecureuil
Aerospatiale AS350 Astar
Aerospatiale AS355 Ecureuil 2
Aerospatiale AS355 Twinstar
Aerospatiale AS.550 Fennec
Aerospatiale AS.555 Fennec
Aerospatiale AS.555 Twinstar

 

as350b
AS350B


Aerospatiale flew the first prototype (F-WVKH) of the AS 350 Ecureuil (squirrel) five/six-seat light general purpose helicopter on 24 June 1974 and introduced a new simplified rotor and an all-new streamlined fuselage with room for five or six persons. Built from composites/fibre-glass, the rotor head was designed without the need for conventional mechanical hinging. It used the inherent flexibility of laminated composites for movement. The AS.350 uses many automobile parts such as a cooling fan from a normal Citroen car and an oil radiator by another automobile manufacturer. The cabin is made of thermoformed polycarbonate semi-monocoque sections with ultrasonic welding. The bearings usually found in rotor hubs have been replaced by elastomeric ball joints which need no lubrication. The first prototype was powered by a Lycoming LTS engine, and the second with a Turbomeca Arriel 1A engine. The first flight of the second example (F-WVKI) was on 14 February, 1975.

 

The first production version was the AS 350B powered by 478kW Arriel IB and certified 27 October 1977.

Production of the AS350B started in July 1978 after eight pre-production models had been built. By the end of December of that year, the company had 459 orders.
The AS350 B2 is an uprated Squirrel variant powered by a 732shp Turbomeca Arriel engine. It was being marketing in the USA as the SuperStar to replace the SA315B Lama in the heavy lifting role.


The AS350B3 is equiped with basically a glass cockpit, a six axis auto-pilot, an AS355 swash plate, rotor head and dual hydraulics. This helicopter is IFR certified.
The conversion from a B model to an AS.350BA consists mainly of fitting the AS355 rotor head and blades and replaced the AS 350B during 1992. French VFR certification was received in 1991, UK and US certifications in 1992, and Japanese in 1993. Production of AS 350BA ended in 1998. All AS 350B1, 350BA and 350B versions can be upgraded to 350B2.

 

Delivery of the 2,000th AS 350/550 (F-WWPZ, later ZJ270 of UK Defence Helicopter Flying School) took place in July 1997.

 

The AS350 features Starflex bearingless glass fibre main rotor head with the main rotor turning at 394 rpm, and tail rotor at 2,086 rpm. Flying controls are single fully powered, with accumulators to delay manual reversion following hydraulic failure until airspeed can be reduced, and inverted aerofoil tailplane to adjust pitch attitude in climb, cruise and descent. In the military AS 550versions fuel is held in a self-sealing composites tank with capacity of 540 litres. An option is a 475 litre auxiliary tank in the cabin.


Engines include: AS 350B2 powered by one 546kW Turbomeca Arriel 1D1 with transmission rated at 440kW for T-O; AS 35OB3/AS 550C3 powered by one 632kW Turbomeca Arriel 2B turbine engine controlled by FADEC, with transmission rated at 500kW for T-O; AS 350D powered by AlliedSignal LTS101 sold only in USA.
Soloy offers conversion using Rolls-Royce 250-C30M turboshaft.


Two individual bucket seats in the front and a four-place rear bench are standard,with a large forward-hinged door on each side of versions for civil use. Sliding doors are standard on military the versions. There is a baggage compartment aft of the cabin, with full-width upward-hinged door on the starboard side. The top of the baggage compartment is reinforced to provide a work platform on each side.


Hydraulic system includes four single-body servo units, operating at 40 bar pressure, and accumulators to delay reversion to manual control; electrical system includes a 4.5kW engine-driven starter/ generator, a 24V 16Ah Ni/Cd battery and a ground power receptacle.


Options include A 907kg capacity cargo sling (1,160 kg for AS 350B2/550, 1,400 kg on AS 350B3), AND A 135kg capacity electric hoist (optional 204kg on AS 350B3).
Similar to the AS 350, the AS355/AS555 has the Starflex main rotor with the two engine shafts driving into a combiner gearbox containing freewheels. The main rotor turns at 394 rpm and tail rotor at 2,086 rpm as does the AS350.


Flying controls are powered, with full dual flying controls without manual reversion, trim by adjustable stick friction, and inverted aerofoil tailplane.


Engines are two Turbomeca Arrius 1A turboshafts, each rated at 357kW for take-off and 302kW maximum continuous; 388kW 30 minutes OEI emergency; 407kW 2.5 minutes OEI emergency; full authority digital engine control (FADEC) allows automatic sequenced starting of both engines, autnmatic top temperature and torque limiting and preselection of lower limits for practice OEI operation. Transmission rating 511kW for T-O. Two integral fuel tanks, with total usable capacity of 730 litres, in body structure. Optional 475 litre auxiliary tank in cabin.

 

The Aerospatiale AS.350C AStar six -place helicopter received U.S. certification in 1978. The helicopter is powered by a 615-shp Lycoming LTS101 turbine driving all-fiber-glass rotor blades and sold only in USA.


The AS350D Astar of 1976 differs solely in having an American Lycoming LTS101 engine.

 

as550c-2fennec

AS.550C-2 Fennec

 

The AS.550 Fennec is a military version of the Eurocopter AS.350 Squirrel powered by a single full FADEC controlled Turbomeca Aniel B2 engine, ordered by the French and Danish Armies.
In 1992 the RoSAF took delivery of 10 utility and training AS.550 A2 models and a further ten AS.550 C2 models, which were equipped with a with a roof mounted sight and can be armed with GIAT 20mm cannon pods, BAE Systems CRV-7 unguided rockets and Hughes HeliTOW anti-armour guided missiles. The A2 is a battlefield version, and can carry weapons.

 

as355f1

AS355F1

 

Sales of the single- (AS 350) and twin-engined (AS 355) versions of the Ecureuil (Squirrel) exceeded 1,300 by 1990.


In February 2001, delivery took place of the 3,000th of Ecureuil family (including AS 355/555), which also was first EC 130 upgraded version. There were a total 10,986,000 Ecureuil flying hours by January 2001.


Also built under licence by Helibras in Brazil as the Esquilo.

Development of the twin-engined AS.355 version of the Squirrel started in 1978 and it is essentially similar to earlier models with the added attraction of twin-engined reliability specified by some op-erators in the rescue, police and night flying roles. The first Twin Squirrel (F-WZLA), with 420shp 250-C20F Allison turboshafts and the Starflex rotor system made its maiden flight on 28 September 1979 followed by the second prototype on 13 November. The twin-engined version is known as the Twinstar in the USA and Ecureuil 2 everywhere else.


After 122 hours of flight testing, production went ahead at a rate of between five and seven helicopters a month, rising to 20-24 in 1981.


Production of the AS 355F was superseded by the AS 355F1 in January 1984. Conversion from an AS355F to AS355F1 enables a higher gross weight.


After several modifications the civilian AS.355F2 is fitted with twin Allison turbines developing around 315kW and new wider composite blades and remoulded engine intakes for anti-icing protection. The AS 355F2 was certified 10 December 1985.


Three military versions of the Ecureuil light helicopter; the single-turbine AS.350L-1, the twin-turbine AS.355M for the French Air Force, and the similar AS.355M-2 for export. All have strengthened airframes, reinforced landing gear, and increased instru-mentation. Other armament options include the 20mm GIAT M621 cannon, 7.62mm machine-gun pods, and unguided rockets.


A naval variant, the AS 555MN, is equipped with a chin-mounted radar, but is unarmed.


Powered by two Turbomeca TM 319 Arrius 1A, the AS 355N was certified in France in 1989, UK and USA in 1992, with deliveries of this version began early 1992. The French Air Force operate the AS.355N in the surveillance role and later models are fitted with Turbomeca TM319 turbines.


An enlarged engine casing above and behind the five-seat cabin identifies the twin-engined AS 355/555 version. The AS.555SR engines are 420 shp (313 kW) Allison 250-C20F turboshafts which are replaced in the North American-marketed TwinStar by 450 shp (335.6 kW) Allison units. 1990 military versions were designated AS 555s and users include Brazil (built by Helibras and designated CH-55 and VH-55 for the Brazilian air force) and France. Armament can comprise GIAT 20-mm cannon and HOT or TOW anti-tank missiles. For naval use two torpedoes can be carried.


The MN is a naval version for sea survey, the SN an ASW version. The AN can have axial weapons.


A total 3,028 AS 350s, AS 355s and EC 130s had been ordered by at least 70 countries by January 2001, of which 2,675 were then in service; 1,948 single-engined Ecureuils were in service at May 2000.


Military customers include Singapore armed forces (10 AS 550B2 and 10 AS 550C2); Australia (RAAF 18 for training; RAN six utility); Danish Army (12 AS 550C2 with ESCO HeliTOW system ordered 1987, delivered 1990); French Army ALAT (originally expressed need for up to 100 to replace Alouette III); French CEV (flight test centre), and FBS Ltd, which ordered 38 AS 350BBs, with deliveries beginning November 1996 and service entry in April 1997. Of these, 26 are Squirrel HT. Mk Is with Defence Helicopter Flying School at Shawbury and 12 are NVG-compatible HT. Mk 2s with 670 Squadron, Army Air Corps, at Middle Wallop; by June 2001 the fleet had amassed 100,000 hours. Other orders include 11 for Brazilian Navy fox liaison and patrol work; 30 for Brazilian Air Force for training; 36 for Brazilian Army (16 for liaison and 20 for training and firefighting); six AS 350B3 for Chilean Army; eight for China (see also CHAIC Z-11) and 40 AS 350B2 options for US Customs Service (augmenting five B2s delivered from 21 October 1998 to supplement 19 earlier AStars); six AS 550C3; 13 AS 350B3 ordered by United Arab Emirates in 2000; and four AS 350B3 for the South African Police Air Wing, of which last two delivered in January 2002. Orders in 1997-2002 were 102, 73, 95, 137, 103 and 132. Deliveries in 2002 were 163.
In 2003 an AS 350B3 cost US$1.4 million.


The AS 3555/555 is equipped with two hydraulic pumps, reservoirs and tandem powered flying control units and electric generators, with a 204kg capacity winch available. A cargo hook is optional; capacity 1,134kg.


Customers for the AS355/AS555 totaled 592 twin-engined Ecureuils in service at May 2000. The French Air Force ordered 52 Fennecs, first eight as AS 355F1s powered by Rolls-Royce 250; flown by 67e Escadre d'Helicopteres at Villacoublay and other units for communications and, with side-mounted Giat M61 20mm gun pod, by ETOM 68 in Guyana; delivery of the remaining 44 (AS 555AN powered by Arrius) began 19 January 1990; from 24th onwards, provision for centrally mounted 20mm cannon and T-100 sight, plus Mistral missiles. The French Army ordered 18 AS 555UNs for TFR training (delivery from February 1992). The Brazilian Air Force has 13 AS 555s: 11 with armament, designated CH-55, and two VIP transports, designated VH-55. The Brazilian Navy acquired 11 UH-12Bs; Brazilian AS 555s assembled by Helibras in Brazil; four more navies ordered eight AS 555s in 1992, two in 1993, four in 1994 and one in 1995. Two AS 333F1s, leased from OSS of Hayes, UK, supplied to the RAF's No. 32 (The Royal) Squadron at Northolt on 1 April 1996 for VIP transport; third subsequently added. Total of six AS 3555Ns ordered by Malaysian Navy on 13 October 2001 with deliveries at end 2003. Orders in 1997-2001 totalled nine, 20, 10, 13 and 17.


VERSIONS:

AS 350B2 Ecureuil
Uprated engine and transmission; wide-chord new section main and tail rotor blades originally developed for AS 355 twin; certified 26 April 1989; known as SuperStar in North America; supplied to UK Ministry of Defence as AS 350BB, designated Squirrel HT. Mk 1 with normal instrumentation and Squirrel HT. Mk 2 with provision for pilot's NVGs.

AS 350B3 Ecureuil
632kW Arriel 2B and wide-chord tail rotor; optimised for high-altitude operation; uprated transmission and digital engine control. First flight (F-WWPB) 4 March 1997; French VFR certification December 1997 after 150 hour test programme; first delivery, to Osterman Helicopter, January 1998; Australian and New Zealand certification achieved late 1998. By 1 June 2001, 180 AS 350B3s were in service with 120 customers, in 25 countries; 100th AS 350B3 delivered 14 December 1999 to Japanese customer.

AS 350BA Ecureuil
Powered by 478kW Turbomeca Arriel 1B and fitted with large main rotor blades of AS 350B2; maximum T-O weight increased by 150kg.

AS 350D AStar
Version of 350B for North American market; improved LTS101 engine, with 6% more power, offered early 1999.

AS 350 Firefighter
Conair system able to pick up water load in 30 seconds while hovering over water; demonstrated 1986; Isolair system certified September 1995.

AS 550ÑÇ Fennec
Light anti-tank version armed with four TOW missiles; has same power plant as AS 550A3 and 2 hour 45 minute endurance.

AS 550A3 Fennec
Light attack version of AS 350B2 with 3-hour endurance; powered by 632kW, Arriel 2B; standard features include taller landing gear, sliding doors; NVG-compatible cockpit; reinforced airframe; provision for armoured seats and engine cowlings; can be armed with single 20mm cannon or two rocket launchers.

AS 550U3 Fennec
Military utility version with Arriel 2B power plant; capable of performing observation, commando and transport duties.

AS 355N Ecureuil 2 / Twinstar
Civil production version, adaptable for passengers, cargo, police, ambulance, slung loads, carrying harbour pilots, working on high-tension cables and other missions; Category A OEI performance; known as TwinStar in USA.

AS 555UN Fennec
Military utility version and French Army ALAT IFR pilot trainer.

AS 555AN Fennec
Armed version; later machines adapted for centreline-mounted 20mm gun and pylon-mounted rockets.

AS 555MN Fennec
Naval unarmed version. Can carry a 360 degree chin-mounted radar.

AS 555SN Fennec
Armed naval version for ASW and over-the-horizon targeting, operating from ships of 600 tonnes upwards; armament includes one lightweight homing torpedo or the cannon and rockets of land-based versions; avionics include Honeywell RDR-1500B 360° chin-mounted radar, Thales Nadir 10 navigation system, Thales RDN 85 Doppler and SFIM 85 T31 three-axis autopilot.

Specifications:


AS.350 Ecureuil
Engine: Turboméca Arriel II, 632 shp    
Length: 35.794 ft / 10.91 m
Rotor diameter: 35.072 ft / 10.69 m        
Fuselage length: 10.9m
Height: 3.15m                 
MTOW: 4630.5 lb / 2100.0 kg
Weight empty: 2348.3 lb / 1065.0 kg        
Max. speed: 147 kts / 272 km/h
Cruising speed: 125 kts / 232 km/h        
Initial climb rate: 1555.12 ft/min / 7.9 m/s
Service ceiling: 4750m                 
HIGE: 2500m
H OGE:     1860m                
Range: 378 nm / 700 km    
Crew: 2                 
Payload: 6 pax

AS.350B Ecureuil
Engine: Turbomeca Arriel 1D1, 614 shp    
TBO: 2000 hrs
Main rotor: 35.1 ft                
Seats: 6
Length: 42.6 ft /     12.99 m            
Height: 10.3 ft / 3.5 m
Width: 10.69 m                
Max ramp wt: 4300 lb
MTOW: 4300 lb                
Std empty wt: 2363 lb
Max useful load: 1937 lb                
Max landing wt: 4300 lb
Max sling load: 2000 lb                
Disc loading: 4.4 lb/sq.ft
Power loading: 6.7 lb/hp                
Max usable fuel:    983 lb
Max ROC: 1555 fpm             
Max speed: 147 kts
Service ceiling: 15,600 ft            
HIGE: 9675 ft
HOGE: 7380 ft                
Normal cruise @ 3000 ft: 123 kts
Fuel flow @ normal cruise: 301 pph
Endurance @ normal cruise: 2.9 hr

AS.350B2 / SuperStar
Engine: 1 x Turbomeca Arriel 1D1        
Instant pwr: 545 kW
Rotor dia: 10.7 m                
Length: 12.99 m
Height: 3.5 m                
Width: 10.69 m
MTOW: 2250 kg                
Useful load: 1090 kg
Max cruise: 135 kts                
Max range: 670 km
HOGE: 8350 ft                
Service ceiling: 15,750 ft
Crew: 2                 
Pax: 4
Seats: 6/7

AS.350B3
Engine: 1 x Turbomeca Arriel 2B, 847 shp    
Max cont pwr: 728 shp
Empty wt: 1202 kg                
MAUW: 2250 kg
Height: 3.5 m                
Width: 10.69 m
Length: 12.99 m                
ROC @ 2250 kg:    1979 fpm
Cruise: 120-130 kt            
Max cruise: 147 kt    
Vne: 155 kt                
MAUW external load: 2800 kg

AS.350BA
Engine: 1 x Turbomeca Arriel 1B        
Instant pwr: 475 kW
Rotor dia: 10.7 m                 
Length: 12.99 m
Height: 3.5 m                
Width: 10.69 m
MTOW: 2100 kg                
Useful load: 945 kg
Max cruise: 126 kts                
Max range: 730 km
HOGE: 6500 ft                
Service ceiling: 15,750 ft
Crew: 2                
Pax: 4
Seats: 6/7

AS.350C AStar
Engine: 1 x Lycoming, 615-shp        
Seats: 6

AS.350D AStar
Engine: 1 x Lycoming LTS101-600A2, 615 shp
TBO: 2400 hrs            
Main rotor: 35.1 ft
Seats: 6            
Length: 42.6 ft
Height: 10.3 ft            
Max ramp wt: 4300 lb
MTOW: 4300 lb            
Std empty wt: 2360 lb
Max useful load: 1940 lb            
Max landing wt: 4300 lb
Max sling load: 2000 lbs            
Disc loading: 4.4 lb/sq.ft
Power loading: 9.37 lbs/hp        
Max usable fuel: 938 lb
Max ROC: 1760 fpm        
Service ceiling: 15,000 ft
HIGE: 8800 ft            
HOGE: 5400 ft
Max speed: 147 kts            
Normal cruise @ 3000 ft: 122 kts
Fuel flow @ normal cruise: 293 pph            
Endurance @ cruise: 3 hr

AS.350L Ecureil
Engine: 1 x Turbomeca Arriel    
Installed pwr: 480 kW
Rotor dia: 10.7 m            
Fuselage length: 10.9 m
No. Blades: 3            
Empty wt: 1065 kg
MTOW: 2200 kg            
Payload: 900 kg
Max speed: 270 kph            
ROC: 480 m/min
Ceiling: 4575 m            
HIGE: 2950 m
HOGE: 2250 m            
Fuel cap (+aux): 530 lt (475 lt)
Range: 700 km            
Crew: 1
Pax: 5

AS.355 Ecureuil 2 / Twinstar
Engine: 2 x Allison 250-C20F, 309 shp    
Length: 35.761 ft / 10.9 m
Height: 10.171 ft / 3.15 m            
Rotor diameter: 35.105 ft / 10.69 m
Fuselage length: 10.9m                 
MTOW: 5600.7 lb / 2540.0 kg
Weight empty: 2877.5 lb / 1305.0 kg        
Max. speed: 121 kts / 224 km/h
Cruising speed: 108 kts / 200 km/h        
Initial climb rate:     1279.53 ft/min / 6.5 m/s
Service ceiling: 11155 ft / / 3400 m        
HIGE: 2000m  
HOGE: 1500m                 
Range: 378 nm / 700 km    
Fuel capacity: 193 USG / 730 lt            
Crew: 1     
Payload: 5 pax

AS.355F TwinStar
Engine: 2 x Allison 250-C20F, 420 shp    
TBO: 3500 hrs
Main rotor: 35.1 ft            
Seats: 6
Length: 42.6 ft            
Height: 10.3 ft
Max ramp weight: 5070 lb            
MTOW: 5070 lb
Standard empty weight: 2807 lb            
Max useful load: 2263 lb
Max landing weight: 5070 lb            
Max sling load: 2300 lb
Disc loading: 5.2 lb/sq.ft        
Power loading: 6 lb/hp
Max usable fuel: 1293 lb            
Max rate of climb: 1614 fpm
Service ceiling: 14,800 ft        
Hover in ground effect: 6900 ft
Max speed: 147 kts             
HOGE: 7900 ft    
Normal cruise @ 3000 ft: 128 kts            
Fuel flow @ normal cruise: 435 pph
Endurance @ normal cruise: 2.8 hr

AS.355F1 Ecureuil II
Engine: 2 x Allison 250-C20F

AS.355F2 Ecureuil II
Engine: 2 x Allison 250-C20F    
Instant pwr: 315 kW
Rotor dia: 10.7 m            
MTOW: 2540 kg
Useful load: 1185 kg            
Max cruise: 120 kts
Max range: 705 km            
Seats: 6/7

AS.355N Ecureuil II
Engine: 2 x Turbomeca Arrius 1A    
Instant pwr: 355 kW
Rotor dia: 10.7 m            
MTOW: 2540 kg
Useful load: 1135 kg            
Max cruise: 120 kts
Max range: 720 km            
HIGE: 8530 ft
HOGE: 5085 ft            
Seats: 6/7

AS.550A2/C2 Fennec
Engine: 1 x Turbomeca Arriel 1D1        
Instant pwr: 545 kW
MTOW: 2500 kg                
Payload: 1160 kg
Max speed: 130 kts                
Max range: 654 km
HIGE: 9850 ft                
HOGE: 7850 ft
Crew: 1                
Pax: 5

AS.550U2 Fennec
Engine: 1 x Turbomeca Arriel 1D1        
Instant pwr: 545 kW
MTOW: 2500 kg                
Payload: 1160 kg
Max speed: 130 kts                
Max range: 654 km
HIGE: 9850 ft                
HOGE: 7550 ft
Crew: 1                
Pax: 5

AS.555MN/SN Fennec
Engines: 2 x Turbomeca Arrius TM3191A1    
Instant pwr: 340 kW
MTOW: 2600 kg                
Payload: 1134 kg
Max speed: 121 kts                
Max range: 722 km
HIGE: 8530 ft                
HOGE: 5085 ft
Crew: 1                
Pax: 5

AS.555SR
Engines: 2 x Allison 250-C20F, 420 shp (313 kW)

AS.555AN Fennec
Engine: 2 x Turbomeca Arrius TM3191A1    
Instant pwr: 390 kW
MTOW: 2600 kg                
Payload: 1135 kg
Max speed: 118 kts                
Max range: 659 km
HIGE: 8530 ft                
HOGE: 5080 ft
Crew: 1                
Pax: 5

AS.555UN Fennec
Engine: 2 x Turbomeca Arrius TM3191A1    
Instant pwr: 390 kW
MTOW: 2600 kg                
Payload: 1135 kg
Max speed: 118 kts                
Max range: 695 km
HIGE: 8530 ft                
HOGE: 5080 ft
Crew: 1                
Pax: 5

 

snias-350

AS.350 Squirrel

 

snias-355

AS355

 

snias-555
As555








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