Gaganyaan mission: ISRO conducts important test on main parachutes
Bengaluru (PTI): ISRO on Tuesday said it has successfully conducted an important test on main parachutes for the Gaganyaan Crew Module at the Babina Field Firing Range (BFFR) in Uttar Pradesh's Jhansi on November 3.
The Indian space agency said this test is part of the ongoing series of Integrated Main Parachute Airdrop Tests (IMAT) for the qualification of the parachute system for the Gaganyaan mission.
The Gaganyaan mission is India's first human spaceflight programme, aiming to send a three-member crew on a three-day mission to space and return them safely to Earth.
As part of the mission, ISRO is developing a human-rated launch vehicle, an orbital module, and a crew-escape system. The programme includes prior unmanned missions to test critical systems before the first manned flight.
In a statement, ISRO said that for the Gaganyaan Crew Module, the parachute system comprises a total of 10 parachutes of four types.
It added that the descent sequence begins with two apex cover separation parachutes that remove the protective cover of the parachute compartment, followed by two drogue parachutes (small powerful parachute deployed from a fast moving object to slow it down) that stabilise and decelerate the module.
Upon release of the drogues, three pilot parachutes are deployed to extract three main parachutes, which further slow down the Crew Module to ensure a safe touchdown, ISRO said.
"The system is designed with redundancy—two of the three main parachutes are sufficient to achieve a safe landing. The main parachutes of the Gaganyaan mission deploy in a step-by-step process known as reefed inflation," ISRO said.
In this process, the parachute first opens partially, which is called reefing, and then fully opens after a predetermined period of time, known as disreefing. This process is carried out using pyro device, it explained.
A pyro device, short for pyrotechnic device, is any mechanism that uses controlled combustion or an explosive chemical reaction to perform a specific function, usually to generate gas, pressure, heat, light, or motion.
"In this test, one of the possible extreme scenarios of delay in the disreefing between the two main parachutes was successfully demonstrated validating the main parachutes for the maximum design," ISRO said.
"The test evaluated the system’s structural integrity and load distribution under asymmetric disreefing conditions—one of the most critical load scenarios expected during actual mission descent," the agency said.
A simulated mass equivalent to the Crew Module was dropped from an altitude of 2.5 km using the Indian Air Force’s IL-76 aircraft, it said, adding the parachute system deployed as planned and the sequence was executed flawlessly, and the test article achieved a stable descent and soft landing, validating the robustness of the parachute design.
"The successful completion of this test marks another significant step toward qualifying the parachute system for human spaceflight, with active participation from the Vikram Sarabhai Space Centre (VSSC), ISRO, Aerial Delivery Research and Development Establishment (ADRDE), DRDO, Indian Air Force and the Indian Army," ISRO said.
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Pak, Afghan forces trade fire along Chaman border: Report
Islamabad (PTI): A heavy exchange of fire between Pakistani and Afghan forces was reported from the key Chaman border, according to a media report on Saturday.
Injuries were reported from the district hospital, but no fatalities occurred, the Dawn newspaper reported.
Officials from both sides accused each other of instigating the flare-up late on Friday night across the border in the Balochistan province.
While Pakistani officials said that Afghan forces had fired mortar shells on the Badani area, Afghan Taliban spokesperson Zabihullah Mujahid claimed it was Pakistan that launched an attack on Spin Boldak, alleging that their forces were responding.
Pakistan's official sources told Dawn that Pakistani forces retaliated against the Afghan aggression and returned fire.
There were also reports of fighting on the Chaman-Kandahar highway, but these could not be immediately verified.
A senior official in Quetta confirmed on condition of anonymity that the exchange of fire started around 10 pm and continued until late at night.
The medical superintendent of Chaman district hospital said that three injured, including a woman, were brought to the medical facility.
There was neither any official word from the Inter-Services Public Relations -- Pakistan Army's media wing -- nor from the Foreign Office.
The Chaman border crossing, also known as Friendship Gate, connects Balochistan province to Afghanistan’s Kandahar.
Relations between Pakistan and Afghanistan have deteriorated amidst regular allegations by Pakistan regarding the failure of the Afghan regime to deny safe havens to Tehreek-e-Taliban Pakistan terrorists.
The two countries had agreed on a ceasefire following tensions last month, but the Foreign Office said last month that technically there was no truce as it was contingent on the Afghan Taliban stopping terrorist attacks in Pakistan, which they had failed to do.
