헬리콥터 헬리콥터의 저시정 환경하 착함보조장치 아스가르드 (ASGaRD)

[위종민]

https://news.usni.org/2022/07/12/usni-news-video-new-navy-helo-tech-taking-danger-out-low-visibility-flying

https://papago.naver.net/website?source=en&target=ko&url=https%3A%2F%2Fnews.usni.org%2F2022%2F07%2F12%2Fusni-news-video-new-navy-helo-tech-taking-danger-out-low-visibility-flying (파파고 번역) 

미해군과 해병대는 지난 10년 동안 저시정 환경에서 15건의 헬기 사고로 36명이 사망했었습니다. 이런 위험한 저시정하 헬기 착함을 보조하기 위해 미해군 NAWCAD는 적응형 함상 유도 및 회복 디스플레이(ASGaRD; Adaptive Shipboard Guidance and Recovery Display )와 저속정밀제어(Low Speed Precision Control)라고 불리는 착함보조장비를 개발중입니다. 

함상 헬기갑판은 매우 좁고 위아래로 움직이기 때문에 저시정 환경 하에서 착함하는 것은 매우 어려운 작업입니다. 

MH-60이 착함할 수 있는 모든 배에서 사용 가능한 아스가르드는 배의 움직임을 모니터링해 조종사에 안전한 착함 시점을 지시할 수 있습니다. 그리고 저시정이나 악조건 상황 하에서 거리에 기반해 파일럿들에게 안전한 착륙 여부를 표시해줄 수 있습니다. 

그러나 비행제어장치와는 연동돼 있지 않아 조종은 파일럿이 100% 담당하고 있습니다. 

아스가르드가 없다면 야간에 헬기를 착륙시키는 데엔 승무원 3명이 필요하다고 합니다. 한 명은 조종하고, 한 명은 함정을 찾고 고도에 집중하며, 한 명은 속도를 제어한다고 합니다. 

아스가르드는 많은 시각적 신호를 제공해 필요한 대화의 양을 줄이고 파일럿이 어떻게 비행하고 있는지 더 나은 환경감각을 갖게 해 줍니다. 

또한 LSPS는 먼지구름 등의 앞을 보기 어려운 환경에서 조종사들이 지상기반 착륙을 할 수 있도록 도와줍니다. 이는 아스가르드와 달리 조종석의 제어장치와 결합되는 모듈식 시스템이라고 합니다. 

현재 이 시스템들은 시뮬레이터 단계이며 실제 운용되기까지는 3, 4년 가량 걸릴 것 같다고 합니다. 

USNI News Video: New Navy Helo Tech Taking Danger Out of Low Visibility Flying

View all posts by Heather Mongilio →

9-11 minutes

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Marines with Battalion Landing Team 3rd Battalion, 6th Marine Regiment, 24th Marine Expeditionary Unit, walk through a rotor wash ‘brown out’ after exiting a CH-53E Super Stallion in Djibouti, Feb. 24, 2015. US Marine Corps Photo

NAVAL AIR STATION PATUXENT RIVER, Md. – Lt. McMillan Hastings and Lt. Ethan Hahn attempted a near-impossible feat of flying – landing their MH-60R Seahawk on a moving destroyer in a fog that brought visibility down to practically zero.

Compared to the acres of deck on an aircraft carrier, the flight deck of an Arleigh Burke-class guided-missile destroyer is only slightly larger than the circumference of a Sea Hawk’s rotor blades and margins are tight. When adding low visibility and a pitching deck, safely landing on a destroyer is among the hardest jobs for a helicopter crew. The conditions for the landing would make it a “suicide mission,” the pilots said.

But the pair calmly landed on the flight deck as easily as on solid ground, as the superstructure of the destroyer emerged just feet in front of the helicopter. Then, they left the simulator.

The difference for Hastings and Hahn was they were using Adaptive Shipboard Guidance and Recovery Display (ASGaRD) – one of two prototype landing aids for low-visibility landings under development at Naval Air Warfare Center Aircraft Division.

In the last decade, the Navy and Marine Corps have had 15 Class A helicopter accidents in low visibility, resulting in 36 deaths.

The new systems – ASGaRD and Low Speed Precision Control – would not only make landing a helicopter safer, but it might also allow pilots to make landings they could not previously do.

Landing a helicopter on a ship in such low visibility settings, as demonstrated by test pilots Hastings and Hahn, is a flight that pilots would not undertake currently because of the risk, they commented.

“I find that landing in low visibility environments to cruiser or destroyer at night are probably the hardest thing that [I] could ever do in an aircraft, and this system allow[s] me to do that easier, faster, and from my perspective, safer than I could ever hope for, with how I would do this in the fleet,” Hastings with the “Blackjacks” of Air Test and Eval‎uation Squadron (HX) 21 told USNI News.

ASGaRD is focused on landing helicopters on ships and uses cockpit displays to provide pilots with visual cues to assist with landing, although it does not interfere with the pilot’s flight, according to NAWCAD.

A helicopter has a more dynamic system than a fixed-wing aircraft, and landing one on a ship is completely different than landing a plane on a runway, he said.

“What I like about it is it really brings a lot of additional capability to shipboard landings, especially currently, there’s just not a whole lot of instruments, landing systems that are capable of getting a helicopter onto the deck of a smaller ship,” Hahn, ​​a rotary-wing aviator with Air Test and Eval‎uation Squadron (VX) 1, said.

Although ASGaRD is not yet ready to be installed in helicopters, ideally it would allow pilots to better land helicopters on ships, said aerospace engineer Jacques Hoffler. It can be used with any ship on which an MH-60 Romeo can land.

U.S. Marines with 1st Marine Division (MARDIV), 1st Marine Expeditionary Force and Marine Heavy Helicopter Squadron (HMH) 465, Marine Aircraft Group 16, 3rd Marine Aircraft Wing, conduct a Tactical Recovery of Aircraft and Personnel (TRAP) mission during exercise Desert Scimitar 2014. US Marine Corps Photo

ASGaRD adjusts for two difficulties pilots encounter. One is ship motion, Hoffler said. The system can give pilots an indication as to when it’s safe to land based on the ship’s movement.

The other is low visibility or a degraded environment. A ship is hard to see about a mile-and-a-half out, so ASGaRD would again tell pilots when it is safe to land-based on distance, Hoffler said.

“It does not touch the flight controls or the aircraft flying characteristics in any way,” Hoffler said. “That is still completely left up to the pilot. What it does is provide guidance and cues to the pilot on how to control the aircraft, but the pilot is still 100 percent in control of the aircraft at all times.”

Without the ASGaRD system, it takes a crew of three people to make the helicopter landings at night, Hastings said. One person to fly, one to find the ship and focus on altitude, and one to direct speed.

Naval Safety Command Data

With ASGaRD, the system provides a lot of the visual cues, requiring less conversation. It also helps give the pilot a better sense of the environment so they can better feel how they are flying.

“That’s going to help you with decelerating the aircraft from higher speed to getting yourself into hover over the ship, as well as coming down from altitude to right over that ship flight deck in a safe way that isn’t going to cause somebody to potentially get hung up or get any type of vertigo condition,” Hastings said.

Hastings compared it to driving at night where people tend to speed or drive slower than they would in the daytime because they cannot see as well in the dark.

The other system also in testing phase is Low-Speed Precision Control, which is meant to assist pilots in making land-based landings in hard-to-see environments, such as dust clouds. Unlike ASGaRD, Low-Speed Precision Control is a modular system that is bolted to the existing controls in the cockpit in order to give pilots flight control and stability modification while landing, according to the NAWCAD news release.

Boatswain’s Mate 2nd Class David Miller, from Chicago, Ill., guides an MH-60S Sea Hawk, assigned to the Wildcards of Helicopter Sea Combat Squadron (HSC) 23 onto the flight deck of the Independence-variant littoral combat ship USS Jackson (LCS-6). US Navy Photo

Helicopter pilots can fly into brownout situations where a dust cloud comes up, making it difficult for the pilot, said Matt Rhinehart, an air mechanic senior engineer.

“And so it either prevents them from doing their mission and in the worst cases, it can cause a mishap and cause a crash,” Rhinehart said. “And so what we really want to focus on is making them able to complete their mission and do it safely.”

Brownouts make flying difficult, Rhinehart said. They take out the horizon references pilots need to fly, and the swirling dust makes a person feel like they are moving, even when they are not.

Without LPSC, a legacy CH-53E Super Stallion needs a crew of five to land, especially in the case of a brownout, Rhinehart said. Everyone is talking to each other to make sure the landing is successful.

“That’s why it’s so dangerous,” Rhinehart said. “Because it’s just so difficult to do, but the Marines have to do it to do their mission.”

Of the 11 Class A Mishaps with low-visibility, eight of them involved brownout, according to the Naval Safety Command statistics.

Like with ASGaRD, LPSC will take the brunt of the responsibility, giving the pilots necessary cues so it does not require as many people to make a landing.

While ASGaRD focuses on helping a pilot with situational awareness, LPSC helps the pilot control the helicopter.

Rhinehart and other engineers at Naval Air Warfare Center Aircraft Division could see there was a problem with helicopters and low visibility, so LPSC is their solution to tackle it.

It was a problem already fixed in more modern rotary aircraft, but the majority of the fleet is older, Rhinehart said. So LPSC brings the modern approach to legacy aircraft. That means when it is installed in older helicopters, there will need to be more hardware installed than just a system upgrade.

An MH-60S Seahawk helicopter from the Red Lions of Helicopter Sea Combat Squadron (HSC) 15 flies as the Nimitz-class aircraft carrier USS Carl Vinson (CVN-70) conducts flight operations in the U.S. 5th Fleet area of operations supporting Operation Inherent Resolve. US Navy Photo

“So I’m excited just number one, because we know it’s a problem the fleet has, and that’s what we do around here,” Rhinehart said. “We solve their problems, we try to solve their problems, so that’s exciting. But from an engineering standpoint, I’m just excited because it’s a challenge. It’s really hard to get these old rotorcraft to do all this cool and modern stuff.”

Right now, the system is still in the preliminary design review phase, where the engineers are confident that it solves the problem, but they need to figure out the transition platform.

Pilots are currently testing the two systems. The systems need to work for the pilots, and the pilots out in the fleet need to know they can trust the systems, Rhinehart said. If they don’t, pilots won’t use it.

Similar systems have already been implemented in fixed-wing aircraft, Hahn said.

For now, ASGaRD and LPSC only exist in simulators at Patuxent River. Rhinehart predicts that it could be out to the fleet in three to four years.