http://www.dsti.net/Information/News/81862
美國陸軍OH-58F直升機首飛
2013-05-06
[據英國《飛行國際》網站2013年4月30日報導]美國陸軍的OH-58F“基奧瓦”直升機於4月26日在美國阿拉巴馬州的紅石兵工廠進行了首飛,據悉該機由美國陸軍自行設計並製造,並將在4月30日做正式首飛。
美國陸軍武裝偵察直升機項目負責人Robert Grigsby上校透露,該型號直升機已經進行了數周的結構測試,但其上沒有安裝航電設備。
陸軍的“基奧瓦”項目負責人Matt Hannah上校透露說,新型的“基奧瓦”直升機比以往的OH-58直升機減重73千克(160磅),從而提升了直升機的飛行性能。但是,現代化改型的OH-58直升機在35℃時的無地效懸停高度無法達到使用方需求的6000英尺(1830米)高度。
儘管升級後的OH-58沒有克服其在高溫高海拔下的性能缺陷,但設計方實質性地提升了直升機駕駛艙和感測器的性能。OH-58F的引入了安裝在機頭部位的雷神AAS-53光電/紅外攝像機,提升了駕駛艙的控制系統的硬體和軟體。此外還引入了全色多功能顯示器、數位通信設備,直升機的耐受性實施已進行了升級,佈線系統也進行了重新設計。未來該型直升機將引入雙餘度發動機數位控制系統和洛克西德馬丁公司的數位式AGM-114“地獄火”空對地/艦導彈。
當前陸軍已經製造了兩架OH-58F和一架結構試驗樣機。第一架生產型也正在阿拉巴馬州生產,並將把該生產線在今年秋季轉移至德克薩斯州的Corpus Christi。之後陸軍將開始製造三架生產樣機以檢驗生產能力。2014年11月將開始有限的用戶試用,預計在2015年3月達到“里程碑C”決定,並開始小批量試生產。預計在2016年底交付部隊使用。
該型號直升機預計將生產368架。首批小批量試生產週期內將生產27架,第二個小批量試生產週期內將生產32架。預計在2017年將開始全速生產並將持續生產至2025年。
儘管美軍最初計畫在2025年左右將OH-58F退役,但是美國國防部當前的財政預算情況可能會使OH-58F繼續服役至2035年左右,一旦這種情況發生,美陸軍將繼續對OH-58F進行結構升級。
此外,儘管OH-58F 60%的部件是新的,另外40%的部件是40多年前的產物。Hannah透露駕駛艙和感測器升級項目並不是延長服役期項目,因為之前服役的OH-58直升機上沒有這些新設備。(中國航空工業發展研究中心 黃宇新)
http://www.flightglobal.com/news/articles/us-army-oh-58f-makes-first-flight-385319/
US Army OH-58F makes first flight
PrintBy: Dave Majumdar Washington DC 01:33 30 Apr 2013 Source:
The US Army's OH-58F Kiowa Warrior made its first flight on 26 April at the Redstone Arsenal in Alabama. The helicopter, which was designed and built by the army itself, will make a formal debut on 30 April.
"What you're going to see is the ceremonial first flight of this aircraft," says Col Robert Grigsby, the army's project manager for armed scout helicopters. "The aircraft actually flew on Friday for the first time."
Grigsby notes that a "structural test" airframe has already been flying for a few weeks, but that it does not have the avionics found on the F-model aircraft.
Lt Col Matt Hannah, the army's product manager for the Kiowa Warrior, says that the new variant reduces the weight of the Bell OH-58 by 73kg (160lb), which improves the aircraft's performance. But the modernised F-model does not meet the service's requirement to hover out of ground effect at 6,000ft (1,830m) pressure altitude at temperatures of 35˚C (95˚F).
While the upgrade does not rectify the Kiowa's shortcomings in the hot and high environment, it does substantially improve the helicopter's cockpit and sensors. The OH-58F adds a new nose-mounted Raytheon AAS-53 electro-optical/infrared camera, improved cockpit control hardware and software for enhanced situational awareness, Hannah says. It also adds three full-colour multifunction displays, digital inter-cockpit communications, aircraft survivability equipment upgrades and a redesigned aircraft wiring harness.
In the future, the aircraft is expected to receive dual-redundant digital engine controls and digital capability for the Lockheed Martin AGM-114 Hellfire air-to-surface missile, Hannah says.
Right now, the army has completed two true OH-58Fs and one structural test vehicle, Hannah says. The service's prototype integration facility is building the first production representative aircraft in Alabama, and production will transition to Corpus Christi, Texas, "in the fall", he says.
When that happens, the army depot at Corpus Christi will build three production representative aircraft to qualify the facility to produce the upgraded machines. Limited user trials will start in November 2014, while a "Milestone C" decision to start low-rate initial production (LRIP) is expected in March 2015, Hannah says. The first operational unit should be equipped with the new variant by late 2016.
Total production is expected to consist of 368 aircraft. LRIP 1 will include 27 aircraft, while Lot 2 is expected to consist of 32. Full-rate production should start in 2017, with the activity to run though 2025.
While the army originally intended for the OH-58F to leave service around 2025, the US Department of Defense's current budgetary situation may require the Kiowa to remain in the inventory into the mid-2030s, Grigsby says. If that is to happen, there will need to be additional structural upgrades to the aircraft.
While 60% of the OH-58F is new, 40% of the aircraft consists of original components dating back more than 40 years, Hannah says. "The CASUP [cockpit and sensor upgrade] programme is not a service life extension programme, and does not zero time the aircraft," he notes.