H-1 upgrade program

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Template:Short description

File:170602-N-RC734-116.jpg
Upgraded H-1 family in flight

The H-1 upgrade program is the United States Marine Corps's program to develop the AH-1Z Viper and UH-1Y Venom military helicopters to replace its aging fleets of AH-1W SuperCobras and UH-1N Twin Hueys. The contract was awarded in 1996 to Bell Helicopter, the original manufacturer of both aircraft, to design the new airframes as modernized attack and utility helicopters with considerable design commonality, to reduce operating costs.

The upgraded type entered service starting in the early 2000s, and have become the dominant type in the USMC as the older models were slowly phased out. The upgraded types have also been exported internationally.

Development

File:UH-1Y lands on HMAS Canberra.jpg
UH-1Y and AH-Z land on ship deck
File:AH-1Z and UH-1Y during trials on USS Bataan (LHD-5) 2005.JPG
An AH-1Z Viper and a Bell UH-1Y Venom during trials aboard the USS Bataan (LHD-5) in 2005

In August 1995, the Secretary of the Navy authorized the Marine Corps to upgrade its utility and attack helicopters as a bridge until the Joint Replacement Aircraft was available in 2020.[1] In 1996, the Marine Corps launched the H-1 upgrade program by signing a contract with Bell for upgrading 180 AH-1Ws into AH-1Zs and upgrading 100 UH-1Ns into UH-1Ys.[2][3] While the original contract called for upgrading existing airframes, it was later modified in 2008 to manufacture completely new aircraft.[2][4][5] The program also includes aircraft simulators.[6] The AH-1Z first flew on 8 December 2000.[7] Three prototype aircraft were delivered to NAVAIR's Naval Air Station Patuxent River in July 2002 for the flight test phase of the program. Low-rate initial production followed beginning in October 2003,[2][8] with deliveries to run through 2018,[9] however, full-rate production was delayed until 2005.[1]

The AH-1Z completed sea-trial flight testing in May 2005.[10] On 15 October 2005, the USMC, through the Naval Air Systems Command, accepted delivery of the first AH-1Z production helicopter to enter the fleet.[11] During the first quarter of 2006, the first production model UH-1Y completed its first flight, and the aircraft were transferred to the Operational Test Unit at the NAS Patuxent River to begin operational evaluation (OPEVAL) testing.[12] In February 2008, Bell received a contract for the last 40 AH-1Zs to be built as new airframes instead of the previously planned rebuild of AH-1Ws.[5] Also that same month, the AH-1Z and UH-1Y began the second and final portion of OPEVAL testing.[13]

Bell delivered three upgraded H-1s to the Marine Corps in February 2008.[14] In September 2008, the NAVAIR proposed adding 46 additional AH-1Zs bringing the total number ordered to 226. The additional aircraft will appear on the 2010 fiscal budget request.[15] The final number of UH-1Y acquisitions was also set at 123.[16] Full-rate production was approved in late 2008.[17]

On September 30, 2008, Bell received a contract for Lot 5 H-1 aircraft. These 15 aircraft in Lot 5 include 11 UH-1Ys and four AH-1Zs, bringing the total contracted number to 49 upgraded H-1 aircraft for the Marine Corps: 37 UH-1Ys and 12 AH-1Zs. At that time, the company had delivered 20 upgraded H-1 helicopters: 14 UH-1Ys and six AH-1Zs.[18][19] On March 27, 2009, the Navy Department ordered 16 Lot 6 H-1 helicopters. The 16 aircraft in Lot 6 include five AH-1Zs and 11 UH-1Ys, bringing the total contract to produce a total of 65 upgraded H-1 aircraft: 17 AH-1Zs and 48 UH-1Ys. At the time, Bell had delivered 23 upgraded H-1 helicopters: six AH-1Zs and 17 UH-1Ys.[20][21]

In May 2009, several helicopters were grounded after a manufacturer's defect was detected in the gearbox.[16] The aircraft deployed with the 13th Marine Expeditionary Unit were not affected.

In September 2009, the UH-1Y entered full rate production, with the Marine Corps expected to receive 21 aircraft by the end of the year.[17] The AH-1Z reached initial operational capability in September 2010,[22] and was approved to begin full-rate production on 10 December 2010.[23][24] The AH-1Z is expected to cost approximately US$Template:Replace each.[25]

Program manager Colonel Harry Hewson expressed interest in exporting the upgraded aircraft via Foreign Military Sales at the 2010 Farnborough Airshow.[26]

Upgrades

File:UH-1Y.jpg
UH-1Y landing on an amphibious assault ship
File:170312-M-MI258-080.jpg
AH-1Z and UH-1Y in Japan

The stated mission of the H-1 upgrade program is to "resolve existing safety deficiencies, significantly improve operational capabilities, and reduce life-cycle costs. Commonality between aircraft will greatly enhance the maintainability and deployability of the systems with the capability to support and operate both aircraft within the same squadron structure."[27] Reduced logistical burden, maintenance costs, and personnel requirements (all of which increase the expeditionary capabilities of the aircraft) are possible by the increased commonality of the two airframes,[25] as well as increased reliability of individual components.[1]

Common Elements

The AH-1Z and UH-1Y share a common tailboom, engines, rotor system, drivetrain, avionics architecture, software, controls and displays for over 84% identical components.[28][29] Both aircraft use twin General Electric T700-GE-401C turboshaft outputting 1,800 shp (1,350 kW) each. Upgrades will also be made to the transmission (rated for Script error: No such module "convert".) and skid landing gear.[27][30]

The existing two-bladed semi-rigid, teetering rotor system is being replaced with a four-bladed, hingeless, bearingless composite rotor system.[25] The improvement in flight characteristics provided by the four-bladed configuration has led to increases in flight envelope, maximum speed, vertical rate-of-climb, payload and reduced rotor vibration.[31]Script error: No such module "Unsubst". The rotor system has 75% fewer parts than that of four-bladed articulated systems, and the improved yokes allow for weight saving with the elimination of all bearings, hinges, and vibration absorbers in the rotor hub.[25] The blades are made of carbon fiber-based composites, which have an increased ballistic survivability, and there is a semiautomatic folding system for stowage aboard Amphibious assault ships.[28] Both helicopters will receive an upgraded, four-blade tail rotor and drive system.[27]

The new integrated avionics system (IAS) has been developed by Northrop Grumman.[27] The system includes two mission computers, an automatic flight control system (reportedly "stops short of a fly-by-wire system"[25]), and a glass cockpit; Bell suggests the system can withstand 23 mm caliber fire.[25] Each crew station has two Script error: No such module "convert". multifunction liquid crystal displays (LCD) and one Script error: No such module "convert". dual function LCD display. The communications suite combines a US Navy RT-1824 integrated radio, UHF/VHF, COMSEC, and modem in a single unit.[6] The navigation suite includes an embedded GPS inertial navigation system (EGI), a digital map system and a low-airspeed air data subsystem, which allows weapons delivery when hovering.[31] The new cockpit systems will increase joint interoperability, now able to transmit and receive data from ground and air systems from other branches.[1][27]

The Lockheed Martin Target Sight System (TSS) incorporates a third-generation FLIR sensor.[27] The TSS provides target sighting in day, night or adverse weather conditions. The system has various view modes and can track with FLIR or by TV.[28] It is also used on the KC-130J Harvest HAWK.[32]

File:AH-1Z pilots with helmet mounted displays.jpg
AH-1Z pilots aboard the Script error: No such module "WPSHIPS utilities". wear helmet-mounted displays

The pilot and copilot are equipped with the Thales "Top Owl" helmet-mounted sight and display system.[29][30] The Top Owl has a 24-hour day/night capability and a binocular display with a 40° field of view. Its visor projection provides forward looking infrared (FLIR) or video imagery. However, the Corps has decided to augment it with existing night vision devices.[25]

AH-1Z

File:AH1Z at the MCAS Miramar Air Show on 3 Oct 2008.JPG
AH-1Z on the tarmac

Its two redesigned wing stubs are longer, with each adding a wingtip station for a missile such as the AIM-9 Sidewinder. Each wing has two other stations for Script error: No such module "convert". Hydra 70 rocket pods, or AGM-114 Hellfire quad missile launchers. The Longbow radar can also be mounted on a wingtip station.[2] It will be able to cruise at approximately Script error: No such module "convert". and sprint at Script error: No such module "convert". before suffering the limits of parasitic drag.[25]

The AH-1Z has survivability equipment including the Hover Infrared Suppression System (HIRSS) to cover engine exhausts, countermeasure dispensers, radar warning, missile warning, and laser warning systems.[28]

UH-1Y

File:Bell UH-1Y Venom (USMC) Pendleton 282.jpg
UH-Y from the rear, showing the distinctive exhaust common to both upgraded types

One of the most critical UH-1Y upgrades is in its powertrain. The UH-1N gradually became burdened with various upgrades: avionics, radios, modern door guns, and safety upgrades; all increasing the UH-1N's empty weight. With a maximum speed of approximately Script error: No such module "convert". and an inability to lift much more than its own crew, fuel and ammunition, the UH-1N became limited in its utility. However, the UH-1Y has upgraded engines and transmission, 170% increased payload, and almost 50% greater range and maximum speed.[29][33] The fuselage has been lengthened by Script error: No such module "convert". just forward of the main door for more capacity.[29]

Exports

In 2013 the upgraded helicopters were being considered by South Korea and Iraq.[34]

AH-1Z Viper

As of 2022, the Viper has been ordered by Royal Bahraini Air Force and the Czech Air Force.[35] Bahrain has ordered 12 and the Czech Republic has ordered 4.

Nigeria has also ordered the AH-1Z, and as of 2024 is planning procure 12.[36]

UH-1Y Venom

The Venom, as of 2022, was ordered by the Czech Air Force, who ordered 8 helicopters.Script error: No such module "Unsubst".

See also

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File:A U.S. Marine Corps UH-1Y Venom helicopter (right) and AH-1W Super Cobra helicopter of Marine Light Attack Helicopter Squadron 369 (HMLA-369) in flight, Forward Operating Base Edinburgh, Helmand Province 111209-M-CL319-101.jpg
AH-1Z Viper (left) and UH-1Y Venom (right)

Related development

Related lists

References

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  1. ↑ a b c d H-1 Upgrade Program on GlobalSecurity.org
  2. ↑ a b c d Donald, David. Modern Battlefield Warplanes. AIRTime Publishing, 2004. Template:ISBN.
  3. ↑ Bishop, Chris. Huey Cobra Gunships. Osprey Publishing, 2006. Template:ISBN.
  4. ↑ Script error: No such module "citation/CS1".
  5. ↑ a b Warwick, Graham. "Bell AH-1Z upgrade to switch to new airframes", Flightglobal.com, 15 February 2008.
  6. ↑ a b USMC H-1 Upgrade Program Script error: No such module "webarchive"., Advanced Simulation Technology, Inc., September 2005
  7. ↑ "AH-1Z completes first flight", Bell Helicopter, 7 December 2000.
  8. ↑ Defense Dept. `Green Lights' Bell's H-1 Upgrade Program Business Wire, October 2003
  9. ↑ "AH-1Z/UH-1Y complete developmental testing", US Navy, 6 March 2006.
  10. ↑ "AH-1Z/UH-1Y complete first sea trials" Script error: No such module "webarchive".. US Navy, 13 June 2005.
  11. ↑ "Bell 449 SuperCobra and KingCobra", Jane's Information Group, 7 December 2005.
  12. ↑ "AH-1Z/UH-1Y Start OPEVAL", US Navy, 6 May 2006.
  13. ↑ Warwick, Graham. "US Marine Corps' Bell AH-1Z and UH-1Y enter final test phase", Flightglobal.com, 20 February 2008.
  14. ↑ "Bell H-1 upgrade program delivers two UH-1Y and one AH-1Z in February" Script error: No such module "webarchive".. Bell Helicopter, 3 March 2008.
  15. ↑ Script error: No such module "citation/CS1".
  16. ↑ a b Script error: No such module "citation/CS1".
  17. ↑ a b Script error: No such module "citation/CS1".
  18. ↑ Script error: No such module "citation/CS1".
  19. ↑ Script error: No such module "citation/CS1".
  20. ↑ Script error: No such module "citation/CS1".
  21. ↑ Script error: No such module "citation/CS1".
  22. ↑ Script error: No such module "citation/CS1".
  23. ↑ Script error: No such module "citation/CS1".
  24. ↑ Script error: No such module "citation/CS1".
  25. ↑ a b c d e f g h "AH-1Z Viper enters production as substantially new aircraft." FlightGlobal, 20 December 2010.
  26. ↑ Script error: No such module "citation/CS1".
  27. ↑ a b c d e f H-1 Upgrade Program (UH-1Y/AH-1Z) Script error: No such module "webarchive"., U.S. Marine Corps, 2007.
  28. ↑ a b c d Bell AH-1Z Pocket Guide Script error: No such module "webarchive"., Bell Helicopter, Retrieved 3 January 2008.
  29. ↑ a b c d Bell UH-1Y pocket guide Script error: No such module "webarchive"., Bell Helicopter, Retrieved 16 August 2008.
  30. ↑ a b Bell AH-1Z page Script error: No such module "webarchive"., Bell Helicopter, Retrieved 3 January 2008.
  31. ↑ a b AH-1W/AH-1Z Super Cobra Attack Helicopter, USA, Airforce-Technology.com. Retrieved: 14 January 2008.
  32. ↑ "From Hueys to Harvest Hawk: Ordnance Marine arms aircraft in Afghanistan" by Cpl. Samantha H. Arrington, DVIDS. 19 May 2011
  33. ↑ Bell UH-1Y page Script error: No such module "webarchive"., Bell Helicopter, Retrieved 3 January 2008.
  34. ↑ "Bell Helicopters' upgraded H-1 generates foreign interest."
  35. ↑ Script error: No such module "citation/CS1".
  36. ↑ Script error: No such module "citation/CS1".

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External links

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