http://www.dsti.net/Information/News/71947
AH-64D“長弓阿帕奇”Block III開始交付美國陸軍
2011-11-07
【據英國《飛行國際》網站2011年11月3日報導】11月2日,波音公司向美國陸軍交付了其690架訂單中的首批兩架AH-64D“長弓阿帕奇”Block III攻擊直升機。另外,一架該型直升機訓練機也將在2012年中交付給首個出口用戶中國臺灣,並在2013年開始交付其訂購的30架Block III。同時,隨著米-28N推出競爭,AH-64D Block III型也成為目前印度國防部唯一考慮購買的攻擊直升機。而在沙特和韓國等世界各國,該機也備受青睞,接近獲得訂單。這一成績對於自啟動後經歷了至少兩次挫折的AH-64D項目來說並不壞。就性能而言,AH-64D Block III目前在重型武裝直升機市場中已不存在真正的對手。
可以說,Block III是彌補AH-64D作戰部署能力的直接產物。1999年,AH-64D在阿爾巴尼亞實際部署中暴露出巨大的性能缺陷,不能在山區進行全武器負荷飛行。原因很簡單:之前二十年的改裝,包括加裝新感測器、武器和支援設備,已經嚴重侵蝕了“阿帕奇”的載荷和速度能力。為了解決這一問題,波音公司採用一種分離扭距平面齒輪對傳動系統進行了升級,從而允許通用電氣將其T700-701D發動機的推力極限由2830軸馬力提升至3400軸馬力。
四年後,AH-64D再次遭受打擊,這次問題出在防護系統上。2003年對伊拉克的作戰初期,“阿帕奇”機隊表現良好,但在3月24日執行一次預先計畫好的縱深打擊任務時,一隊“阿帕奇”遭到伊拉克民兵的伏擊,一架直升機疑似被步槍子彈擊中後墜落。AH-64專案經理謝恩•歐佩肖上校回憶稱:“那次飛行並不是Block III的決策點,但卻使我們對該型直升機的使用進行了重新審視。”審視的結果是:不應再有大編隊的“阿帕奇”單獨進入敵方縱深區域。為此,最新的Block III標準允許AH-64D控制無人機,代替其飛入敵後方或在編隊前方飛行偵察。AH-64D Block III安裝了用來與無人機通訊的附加天線,但其與美國空軍飛機通訊的能力要等到數年後引入Link 16資料鏈後才能獲得。但未來幾年內不會引入諸如士兵網路信號和多頻網路信號等其他通訊信號。
2004年2月,美國陸軍正式啟動Block III現代化項目。當時的計畫是按照波音公司未來戰鬥系統(FCS)專案將AH-64D發展成戰場網路中的一個中心節點。然而隨著美國陸軍終止了FCS,Block III項目的這一設想也隨之煙消雲散。FCS的終止使Block III進行了徹底改動,服役壽命得到延長,並為保證機隊服役至2040年進行了必要的性能升級。
雖然方案經歷了眾多修正,但“阿帕奇”的Block III升級需求始終沒有動搖。旋翼機一直是美國軍方採辦計畫中的最高優先順序。即便是在預算開始削減時,AH-64D Block III仍然獲得了全額資金,並且在低速生產階段的51架訂單結束後,美國陸軍計畫在2012年8月啟動全速生產。僅剩的問題是美國陸軍將以多快的速度採購新Block III,AH-64D Block III產品經理表示最慢的速度是一年裝備一個由兩個營構成的單一戰鬥航空旅。(中國航空工業發展研究中心 褚世永)
http://www.flightglobal.com/news/articles/from-albania-to-afghanistan-us-army-integrates-lessons-into-latest-apache-364245/
From Albania to Afghanistan, US Army integrates lessons into latest Apache Print
By: Stephen Trimble Washington DC 11:12 3 Nov 2011 Source:
On 2 November, Boeing delivered the first two of 690 AH-64D Apache Longbow Block III attack helicopters to the US Army.
A training aircraft will also be delivered to the first export customer - Taiwan - in mid-2012, with the balance of the nation's order for 30 Block III aircraft to begin delivery a year later.
The Block III version of the AH-64D is also the only aircraft now being considered by the Indian defence ministry for its attack helicopter contest, after the nation eliminated a rival bid from Russia's Mil Mi-28N.
And the US airframer's latest rotorcraft product is close to completing deals all over the world, including in Saudi Arabia and South Korea - not bad for a helicopter programme that survived at least two evolutions of its operational purpose since it was launched.
The AH-64D Block III now has no true competitor that can match its capability in the heavy helicopter gunship market.
The Block III programme was conceived in the immediate aftermath of a notorious operational deployment.
In 1999, Task Force Hawk revealed glaring performance shortfalls in the AH-64D, which Lt Col Dan Bailey - a member of the ill-fated task force, and now AH-64D Block III product manager - said was unable to fly with a full weapons load in the mountains of Albania.
Two decades of added bulk - including new sensors, weapons and support equipment - had eroded the Apache's lift and speed by 1999.
In response, the Block III introduces upgrades to the transmission with a split-torque face gear, allowing US manufacturer General Electric to increase the thrust rating of its T700-701D engines from 2,830shp (2,080kW) to 3,400shp.
Four years later, the AH-64D was again caught off guard. The Apache fleet generally performed well in the second invasion of Iraq in 2003, but a pre-planned deep strike mission on 24 March was a debacle. An Apache force was ambushed by Iraqi villagers and militiamen, and one aircraft was downed - possibly by a mere rifle bullet.
"That specific fight was not a decision point for [Block III]," said Col Shane Openshaw, AH-64 programme manager, adding: "It was an opportunity to re-look at the way we were going to use the aircraft."
Never again would a large formation of Apaches fly deep and alone into enemy territory.
The Block III standard allows the AH-64D to control unmanned air systems (UAS) - so instead of flying deep behind enemy lines alone, UAS could fly ahead of the formation and watch for anything unusual.
Nearly a year after the ambush, the army formally launched the Block III modernisation programme in February 2004. At the time, it planned to make the AH-64D a central node in the battlefield network in development by Boeing's Future Combat System (FCS) programme.
However, that part of the Block III programme's original justification was lost when the army terminated FCS.
The new variant includes additional antennas to communicate with UAS, but the ability to communicate with US Air Force aircraft will not arrive until a Link 16 datalink is added in a few years.
Other communications waveforms, such as the soldier networking waveform and wideband networking waveform, will not be integrated for several years.
In the aftermath of FCS' termination, Block III was re-cast as a service life extension programme and a necessary performance upgrade to keep the AH-64D fleet relevant through to its planned retirement in 2040.
Despite so many concept revisions, the demand for the Block III upgrades for the Apache never wavered. Rotorcraft of all types remain a top priority in the US military's acquisition plans. While budgets are starting to tighten, the AH-64D Block III is still fully-funded - and after orders for 51 aircraft in the low-rate initial production phase, the army is scheduled to make a full-rate production decision in August 2012.
Approval is expected, and the only debate is how fast the service will buy new Block IIIs.
The minimum rate is to deliver enough aircraft to equip a single combat aviation brigade with two battalions a year, Bailey said - and that is not expected to change.