Bell 412 vs Offshore Helicopter Services

FORCETALLY

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Bell 412 — licensed reference photograph

AHelicopters

Bell 412

Multipurpose utility helicopter

Credit

Sardaka · CC BY-SA 4.0 · Resized · CC BY-SA 4.0 · Source ↗ · Modified

BHelicopters

Offshore Helicopter Services

British helicopter operator, specialising in providing offshore helicopter transportation services to North Sea offshore platforms

First system

Second system

Measured figures

Head to head

1 of 29 rows sourced on both sides

17.09mBell 412EP · including rotors

—

Length

All recorded figures & sources

17.09 m

Bell 412EP · including rotors

Single source

56 ft 1 in (17.09 m) including rotors^[source]

14.02mBell 412EP · Main rotor diameter

Configuration

Details

Bell 412 and Offshore Helicopter Services configuration
Specification	Bell 412	Offshore Helicopter Services
Crew	one-two pilots^[source]	—
Type	Multipurpose utility helicopter^[source]	—
National origin	United States / Canada^[source]	United Kingdom^[source]
Manufacturer	Bell Helicopter^[source]	—
Primary users	Japan Ground Self Defence Force See Operators for others^[source]	—

Number built	1,300+^[source]	—

Manufactured	1979–present^[source]	—

Introduction date	1981 ( 1981 )^[source]	—

First flight	August 1979 ( 1979-08 )^[source]	—

Developed from	Bell 212^[source]	—

Variant	Bell CH-146 Griffon^[source]	—

Capacity	up to 13 passengers, maximum external load of almost 6,614 lb (3,000 kg)^[source]	—

Fuselage length	43 ft (13 m)^[source]	—

Blade sections	root: Boeing VR-7; tip: Wortmann FX 71-H-080^[source]	—

Main rotor area	1,662 sq ft (154.4 m 2 )^[source]	—

Power/mass	0.2663 hp/lb (0.4378 kW/kg)^[source]	—

Role	—	British helicopter operator, specialising in providing offshore helicopter transportation services to North Sea offshore platforms^[source]

Source measurement	—	OHS operates a mixed fleet of helicopters on behalf of a small number of energy industry customers. Annually they transport around 200,000 passengers to and from offshore oil and gas platforms from bases at Aberdeen and Sumburgh airports. OHS also operates two specialist Search and Rescue (SAR) aircraft to support the Oil and Gas industry. These two AW139 helicopters are based at Aberdeen airport and equipped with specialist search and rescue equipment and provide 24-hour SAR coverage for the central North Sea.^[source]Offshore Helicopter Services · Lead; only the objects and conditions stated in this passage Mission Critical Services Offshore is based in Aberdeen , Scotland with additional operations located in Sumburgh. The company opened a new terminal – Terminal 2 – in Aberdeen in 2014, initially serving Nexen passengers. In 2015, the company opened a major new hangar at Aberdeen airport to accommodate its fleet. The 21,000 square feet (2,000 m 2 ) hangar at the east side of the airport is used as both a maintenance and storage facility for S-92, H175, AW139 and AS365N3 helicopters.^[source]Offshore Helicopter Services · History / Offices; only the objects and conditions stated in this passage 18 February 2009 – G-REDU, an EC225 LP. During a night visual approach to the Eastern Trough Area Project platform, the helicopter descended and impacted the surface of the sea. The crew's perception of the position and orientation of the helicopter relative to the platform during the final approach was erroneous. All 18 people on board survived the controlled flight into terrain (water) .^[source]Offshore Helicopter Services · Accidents and incidents; only the objects and conditions stated in this passage 1 April 2009 – G-REDL, a Eurocopter AS332 L2 Super Puma Mk 2, returning from the Miller oilfield went down in the North Sea, 40 miles northeast of Aberdeen, killing all sixteen on board. Preliminary cause was attributed to a catastrophic failure in the main gearbox.^[source]Offshore Helicopter Services · Accidents and incidents; only the objects and conditions stated in this passage 10 May 2012 – G-REDW, a Bond Eurocopter EC225 Super Puma , travelling to the Conocophillips operated Joanne and Judy fields made a controlled ditching into the North Sea following a radio report of a low oil pressure light. All 14 people were rescued from the helicopter liferaft, 9 were airlifted to Aberdeen Royal Infirmary while the remaining five were brought to Aberdeen by lifeboat. On 15 June 2012 helicopter manufacturer Eurocopter cleared Bond Offshore Helicopters of any blame for the ditching of G-REDW. On 17 October 2012 AAIB concluded in their S5/2012 report that a faulty design of the Emergency Lubrication System was the most likely cause of the warnings that led to the ditching of G-REDW and recommended "Eurocopter to review the design of the main gearbox emergency lubrication system on the EC225 LP Super Puma to ensure that the system will provide the crew with an accurate indication of its status when activated".^[source]Offshore Helicopter Services · Accidents and incidents; only the objects and conditions stated in this passage 17 February 2023 – G-MCSH, an Airbus Helicopters H175 , flew 130 miles (210 km) to the Elgin-Franklin complex east of Aberdeen. The aircraft landed safely but an illuminated tail rotor chip light prevented it from departing for its return journey. While the helicopter was parked on the helipad, gusts from Storm Otto , which reached over 100 mph (160 km/h), snapped off three of its five blades close to the root. Industry sources advise that the rotor brake failed to hold the main blades from windmilling before they had been tied down, resulting in the loss of two of the broken blades into the north sea, while another hit the cockpit.^[source]Offshore Helicopter Services · Accidents and incidents; only the objects and conditions stated in this passage

Source measurement

—

OHS operates a mixed fleet of helicopters on behalf of a small number of energy industry customers. Annually they transport around 200,000 passengers to and from offshore oil and gas platforms from bases at Aberdeen and Sumburgh airports. OHS also operates two specialist Search and Rescue (SAR) aircraft to support the Oil and Gas industry. These two AW139 helicopters are based at Aberdeen airport and equipped with specialist search and rescue equipment and provide 24-hour SAR coverage for the central North Sea.^[source]Offshore Helicopter Services · Lead; only the objects and conditions stated in this passage

Mission Critical Services Offshore is based in Aberdeen , Scotland with additional operations located in Sumburgh. The company opened a new terminal – Terminal 2 – in Aberdeen in 2014, initially serving Nexen passengers. In 2015, the company opened a major new hangar at Aberdeen airport to accommodate its fleet. The 21,000 square feet (2,000 m 2 ) hangar at the east side of the airport is used as both a maintenance and storage facility for S-92, H175, AW139 and AS365N3 helicopters.^[source]Offshore Helicopter Services · History / Offices; only the objects and conditions stated in this passage

18 February 2009 – G-REDU, an EC225 LP. During a night visual approach to the Eastern Trough Area Project platform, the helicopter descended and impacted the surface of the sea. The crew's perception of the position and orientation of the helicopter relative to the platform during the final approach was erroneous. All 18 people on board survived the controlled flight into terrain (water) .^[source]Offshore Helicopter Services · Accidents and incidents; only the objects and conditions stated in this passage

1 April 2009 – G-REDL, a Eurocopter AS332 L2 Super Puma Mk 2, returning from the Miller oilfield went down in the North Sea, 40 miles northeast of Aberdeen, killing all sixteen on board. Preliminary cause was attributed to a catastrophic failure in the main gearbox.^[source]Offshore Helicopter Services · Accidents and incidents; only the objects and conditions stated in this passage

10 May 2012 – G-REDW, a Bond Eurocopter EC225 Super Puma , travelling to the Conocophillips operated Joanne and Judy fields made a controlled ditching into the North Sea following a radio report of a low oil pressure light. All 14 people were rescued from the helicopter liferaft, 9 were airlifted to Aberdeen Royal Infirmary while the remaining five were brought to Aberdeen by lifeboat. On 15 June 2012 helicopter manufacturer Eurocopter cleared Bond Offshore Helicopters of any blame for the ditching of G-REDW. On 17 October 2012 AAIB concluded in their S5/2012 report that a faulty design of the Emergency Lubrication System was the most likely cause of the warnings that led to the ditching of G-REDW and recommended "Eurocopter to review the design of the main gearbox emergency lubrication system on the EC225 LP Super Puma to ensure that the system will provide the crew with an accurate indication of its status when activated".^[source]Offshore Helicopter Services · Accidents and incidents; only the objects and conditions stated in this passage

17 February 2023 – G-MCSH, an Airbus Helicopters H175 , flew 130 miles (210 km) to the Elgin-Franklin complex east of Aberdeen. The aircraft landed safely but an illuminated tail rotor chip light prevented it from departing for its return journey. While the helicopter was parked on the helipad, gusts from Storm Otto , which reached over 100 mph (160 km/h), snapped off three of its five blades close to the root. Industry sources advise that the rotor brake failed to hold the main blades from windmilling before they had been tied down, resulting in the loss of two of the broken blades into the north sea, while another hit the cockpit.^[source]Offshore Helicopter Services · Accidents and incidents; only the objects and conditions stated in this passage