Grumman Mallard

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Grumman Mallard
Grumman G-73 Mallard
Type	Amphibious Airliner
Manufacturer	Grumman
Maiden flight	30 April 1946
Status	In service
Primary user	Chalk's Ocean Airways (4) (Until September 2007)
Produced	1946-1951
Number built	59
Unit cost	$115,000 $4.0 million for turbine powered G-73T

The Grumman G-73 "Mallard" is a large, twin engine amphibious aircraft. Many have been modified by replacing the original Pratt & Whitney Wasp H radial engines with modern turboprop engines. Manufactured from 1946 to 1951, production ended when Grumman's much larger HU-16 Albatross was introduced.

Contents 1 Design and development 2 Operational history 3 Incidents 4 Operators 4.1 Civil operators 4.2 Military operators 5 Specifications (G-73T) 6 See also 7 References 7.1 Notes 7.2 Bibliography 8 External links

[edit] Design and development

Building on the success of the Goose and Widgeon, Grumman Aircraft developed Design 73, the larger "Mallard" for commercial use. Retaining many of the features of the smaller aircraft, such as twin radials, high wings with removable underwing floats, retractable gear and a large straight tail, the company built 59 Mallards between 1946 and 1951. Unlike the smaller aircraft, the Mallard featured tricycle gear, a stressed skin, two step hull and wingtip fuel tanks.

[edit] Operational history

The Mallard prototype first flew on 30 April 1946, with the first production aircraft entering service in September of that year. While the Mallard was designed for regional airline operations with two pilots and ten passengers especially aimed at harbor-based, city-to-city hops on the eastern seaboard, postwar surplus aircraft sales and the availability of smaller airports limited market potential. A number of smaller air carriers did use the Mallard in its intended role, notably Tahiti-Hawaii Airlines and Pacific Western Airlines (Canada). However, most of the 59 Mallards delivered were for corporate use.

The Mallard received a lease in life in the 1970s when a number of airframes were refitted by Frakes Aviation with Pratt & Whitney Canada PT6A-34 turbines and upgraded for 17 passengers, to become "Turbo Mallards." Today, through attrition, only 32 Mallards remain registered in the US. Many of the rest are in use around the globe.

A similar program has been undertaken by Paspaley Pearling in combination with Aero Engineers Australia to re-engine and modernise it's Mallard fleet, which are used to support its pearling operations in Northern Australia. The fleet has been extensively rebuilt and also reengined with P&WC PT6A's and are currently undergoing a life extension program.

[edit] Incidents

The type received much attention after a 1947 Mallard, operating as Chalk's Ocean Airways Flight 101, crashed after takeoff from Miami on 19 December 2005. Eighteen passengers and two crew perished when the right wing separated from the fuselage. The cause of the accident was determined to be cracks and/or corrosion in the wing spar.

Prior to 2005, Chalk's Ocean Airways had an exemplary safety record operating Mallards for many years between Florida and the Bahamas, having never had a passenger fatality since the company began operations in 1917.

[edit] Operators

[edit] Civil operators

 Australia

• Paspaley Pearling Co.

 Canada

• Pacific Western Airlines

 United States

• Antilles Airboats
• Chalk's Ocean Airways
• Virgin Islands Seaplane Shuttle

[edit] Military operators

 Egypt

• Royal Egyptian Air Force

[edit] Specifications (G-73T)

General characteristics

• Crew: two, pilot and co-pilot
• Capacity: Up to 17 passengers, but executive configurations are mostly applied.
• Length: 48 ft 4 in (14.7 m)
• Wingspan: 66 ft 8 in (20.3 m)
• Height: 18 ft 9 in (5.7 m)
• Empty weight: 8300 Jet A Turbine Engines (9200 AvGas Engines)
• Loaded weight: 14000 with Jet A Turbine Engines (12750 with AvGas Engines)
• Useful load: 5,500 lb with Jet A Turbine Engines (3,550 lb with AvGas Engines)
• Max takeoff weight: 14000 with Jet A Turbine Engines (12750 with AvGas Engines)
• Powerplant: 2× , P&W PT6A-34, 715 hp (447 kW) each

Performance

• Never exceed speed: 187 Kts
• Range: 1,120 nautical miles (2,070 km)
• Service ceiling FL245 ()
• Rate of climb: 1350 ft/m ()

[edit] See also

Comparable aircraft

• Consolidated Aircraft PBY Catalina
• Grumman Albatross
  

Related lists

• List of flying boats
  

[edit] References

[edit] Notes

[edit] Bibliography

[edit] External links

• New York Times' article about Chalk's accident
• Aircraft Maintenance Technology article about Chalk's accident
• NTSB preliminary report on Chalk's accident DCA06MA010 of 19 December 2005
• Picture of a Chalk's Mallard in Miami in 1996
• History of Chalk's Ocean Airways at answers.com

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