Even in this high-tech age, the search for missing Malaysia Airlines flight MH370 may rely on good luck and the oldest of sensors: the human eye.
After a futile search in the Andaman Sea that produced 400 radar contacts and no sign of aircraft debris or other clues, the U.S. Navy has sent its most advanced surveillance plane, a P8-A Poseidon, to join planes from Australia and New Zealand in scanning 600,000 square kilometers (230,000 square miles) off the southern Indian Ocean.
While Navy surveillance planes are equipped with radar, cameras and electro-optical sensors, searching for objects on open water is an arduous task, with sailors at every window looking with binoculars and the plane diving to identify targets visually, said Michael Boston, a retired U.S. Navy chief petty officer who’s served as an electronic warfare specialist on P3-C Orion surveillance plane.
With few clues to the location of the jetliner missing since March 8, the vastness of the Indian Ocean and the limitations of the P-8 and the older P-3 in finding anything beneath the water’s surface, “it’s a daunting challenge,” said Richard Burgess, a retired P3-C mission commander.
A successful search would require finding objects such as life rafts, seat cushions, evacuation chutes, luggage and possibly bodies floating in the water, said Burgess, managing editor of Seapower Magazine, a publication of the Navy League, based in Arlington, Virginia.
"Low Altitude"
The P8’s crew will fly at an altitude of about 5,000 feet (1.52 kilometers), dropping at times to 1,000 feet to eyeball objects picked out by radar in a stretch of ocean 1 1/2 times the size of California more than 3,000 kilometers (1,865 miles) south-southwest of Perth.
Much of the area is within the Roaring Forties, a region between the 40th and 50th degrees of latitude south known for strong winds and wave conditions, according to charts provided by the Australian Maritime Safety Authority.
Investigators have determined the Beijing-bound flight from Kuala Lumpur was deliberately steered off course to the west. Whoever was piloting the jetliner turned off the plane’s transponder, which helps radar pinpoint location, and a text-to- ground messaging system.
The search area for Flight 370 is based on what was described by U.S. authorities as its most likely last-known position based on satellite transmissions, adjusted to reflect water movement and weather since March 8 and assumptions about aircraft speed, John Young, the Australian authority’s general manager for emergency response, said at a briefing yesterday.
"Currents, Waves"
“While the process may seem simple, factors such as the number of ships or objects in the area, sea state, drift rate, and visibility can affect how much area we’re able to cover,” Lieutenant Joshua Mize, a tactical coordinator aboard the U.S. P8-A search plane, said in a statement distributed by the Navy.
An earlier search by the P8-A in the seas north of the Strait of Malacca yielded 400 radar contacts, the Navy’s 7th Fleet said in a statement. “Unfortunately, none were associated with aircraft debris or wreckage,” the Navy said.
Now the P8-A, a heavily modified version of Chicago-based Boeing Co.’s 737 commercial airliner, is joining two Royal Australian Air Force AP-3C Orion surveillance aircraft to hunt for Flight 370 in an area of the open ocean where the crew will confront sea currents and high winds.
The P8-A is the Navy’s newest surveillance plane. The P-3C Orion is a four-engine turboprop built by Lockheed Martin Corp., based in Bethesda, Maryland, and has been in service in the Navy since the 1960s.
"Modified 737"
Flying at 288-311 miles per hour (250-270 knots), the Poseidon can search for as long as nine hours, “depending on the transit distance some flights may only have two-three hours of search time” Mize said.
Surveillance planes use different search patterns depending on the object being tracked and other details about the target, said Boston, now based in Troy, Virginia.
“If the exact last position is known, the Navy will typically assign an expanding circle” from that starting point, known as the datum, which expands at the rate a submarine or target is known to be moving, he said.
In the search for the missing airliner, the Navy is more likely to use a ladder pattern, starting from a map coordinate with a series of parallel flight legs connected by turns in an expanding search square, said Lieutenant Commander Katie Cerezo, a Navy spokeswoman.
Depending on the mission, commanders have to make a series of calculations on how high to fly, the length of a single track and the spacing between tracks to mount an effective search, Boston said.
"Oil Drum"
To make visual contact with objects detected by radar while flying at a higher altitude, the plane has to descend, and that could add time, he said. “At 24,000 feet if you detect with radar, you can’t see it visually. It takes as much as 15 minutes to descend, and by that time the object could submerge and resurface 20 minutes later.”
Once while flying on a surveillance mission in the north Arabian Sea in the early 1990s, Boston said, his P3-C Orion’s radar spotted an object about 3 feet tall and 2 feet wide on the water that looked like a submarine’s periscope. “So we descended right on top of it, to about 200 feet,” only to discover it was a discarded oil drum.
If the crew detects anything or is given more precise search locations, they could drop sonobuoys -- launched from the plane’s belly -- that act like underwater microphones to listen for any “pings” from the missing plane’s black boxes, Burgess said. The pingers are supposed to emit signals for 30 days after becoming immersed in water.
"Underwater Microphones"
Yet those buoys may be of little use without a clue to the missing plane’s location. “It would be a big waste of money to drop them randomly,” he said.
While the black boxes are designed to withstand depths of 20,000 feet (3.8 miles) and may work in even deeper water, the range of the pings is a mile, according to manuals from Honeywell International Inc., the maker of the equipment. That may make the signals difficult to pick up even if an underwater microphone is over the correct location.
It can be difficult to hear the pingers if they are blocked by undersea mountains, said Dave Gallo, director of special projects at the Woods Hole Oceanographic Institution in Massachusetts, in an interview. Layers of water with different temperatures can also block sounds, he said.
The emergency locator transmitters on a 777 are designed for land and don’t work underwater, nor do the satellite transmissions that investigators have used to triangulate the likely last-known location.
“I just don’t have a lot of hope for success in this effort because of the distance the plane could have gone,” Burgess said.
“At some point, you have to decide whether it’s worth it or not anymore,” he said. “Your hope of finding something goes down as time goes on. I would call it off in three or four days” if nothing is found.
Bloomberg
Wed Mar 19 2014
Nahas helikopter Lumut: Hina anggota TLDM terkorban, polis siasat Saifuddin Shafik
Polis menyiasat pemilik akaun, Saifuddin Shafik yang dipercayai memuat naik hantaran jelik berkaitan insiden kemalangan melibatkan helikopter TLDM.
Kes model sambilan bunuh teman lelaki: Tarikh baharu sebutan ditetap 28 Mei
Mahkamah Majistret menetapkan 28 Mei ini sebagai tarikh baharu sebutan kes seorang model sambilan wanita yang didakwa membunuh teman lelakinya.
Pantau Agenda Reformasi: Misi Break The Siege: Freedom Flotilla to Gaza
Pantau Agenda Reformasi hari ini membawakan Profesor Hubungan Antarabangsa di Fakulti Undang-Undang dan Hubungan Antarabangsa di UNISZA, Prof Dr Mohd Afandi Salleh, yang juga merupakan bekas peserta misi Flotilla ke Gaza pada 2018, berkongsi pengalamannya ketika ditahan pihak rejim Israel sewaktu misi tersebut. Antara lain perbincangan tertumpu ke arah aspek hubungan antarabangsa serta undang-undang di perairan antarabangsa.
Nahas helikopter Lumut: Mindef pertimbang keperluan teliti SOP latihan udara - Mohamed Khaled
Mindef akan mempertimbangkan keperluan untuk meneliti semula SOP latihan udara membentuk formasi penerbangan lintas hormat bagi mengelak tragedi.
Keselamatan siber: Keterangkuman, kepelbagaian perkasa sumbangan wanita
Wanita harus mula memberi fokus dan penekanan terhadap keterangkuman dan kepelbagaian perspektif bagi membolehkan mereka menangani cabaran industri dengan berkesan.
Penyerang Kamal Adli dijatuhkan hukuman lebih 2 tahun oleh mahkamah Singapura
Lelaki yang menyerang pelakon Malaysia, Kamal Adli menggunakan belantan tahun lepas, dijatuhkan hukuman penjara dua tahun, empat bulan dan dua minggu.
Peruntukan pembangkang: Terserah Muhyiddin untuk persoal keikhlasan kerajaan - Fadillah
Beliau enggan melayani sindiran bekas Perdana Menteri yang juga Pengerusi Perikatan Nasional, Tan Sri Muhyiddin Yassin tentang isu tersebut.
SPRM jangka ada beberapa tangkapan isu tuntutan palsu anak menteri besar - Azam
SPRM akan membuat beberapa tangkapan lagi, berhubung kes melibatkan anak seorang menteri besar bagi membantu siasatan kes tuntutan palsu berjumlah RM600,000.
SPRM akan panggil beberapa lagi individu bantu siasatan
Suruhanjaya Pencegahan Rasuah Malaysia (SPRM) akan memanggil beberapa lagi individu bagi membantu siasatan dakwaan pemalsuan dokumen tuntutan berjumlah RM600,000 melibatkan lima individu termasuk anak seorang Menteri Besar.
Pak Lah stabil, masih perlukan rehat secukupnya
Mantan Perdana Menteri, Tun Abdullah Ahmad Badawi dimasukkan ke Institut Jantung Negara (IJN), di sini, pada Rabu setelah mengalami small spontaneous pneumothorax.
Buat masa ini, keadaan beliau dilaporkan stabil dan masih dirawat di Unit Penjagaan Koronari (Coronary Care Unit).
Buat masa ini, keadaan beliau dilaporkan stabil dan masih dirawat di Unit Penjagaan Koronari (Coronary Care Unit).