Showing posts with label Dhruv Helicopter. Show all posts
Showing posts with label Dhruv Helicopter. Show all posts

31 Jul 2014

Ill-fated IAF chopper was serviced a few days before crash

Hemanth CS.

The Indian Air Force's (IAF) ill-fated Advanced Light Helicopter (ALH) Dhruv, which crashed last week in Uttar Pradesh, is said to be repaired and serviced a few days before the incident.
Ministry of Defence sources told dna that the ill-fated chopper is said to have clocked more than 500 flying hours and that it was serviced only a few days before the crash, leaving seven people on-board dead.

The Hindustan Aeronautics Limited (HAL), the manufactures of the 5.5 tonne, have meanwhile retrieved the flight data recorder of the crashed chopper. Though initial reports suggest that the crash could have occurred due to a snag in the engine, a court of inquiry has been ordered to ascertain the exact reason for the crash.

A HAL official said the flight data recorder has been brought to Bangalore, to probe what led to the crash.

"The data from the flight data recorder and the cock pit voice recorder would retrieved and analysed to find out what led to the crash. The finding would be submitted to the court which is carrying out the inquiry," said the official.

The IAF has said that the pilots of the helicopter which was airborne from Bareilly to Allahabad, had given a 'May-Day' (emergency) call. Thereafter, the IAF lost contact with the helicopter on radar and radio. This is the seventh time when an ALH Dhruv has crashed, and the second crash to have occurred this year. In February, an ALH Dhruv chopper which was exported to Ecuador had crashed in the South American country killing three people on board.

The HAL official said that the inquiry into the Ecuadoran crash is on, and that the preliminarily findings have hinted that it could be due to an error by the pilot. He also added that the inquiry report would be submitted directly to Ecuador and not made public due to non-disclosure agreement between HAL and South America.

via Daily News & Analysis

27 Jul 2014

Why Air Force’s Dhruv Helicopters Crash Often?

In a vast country like Inida, on an average one chopper or helicopter crashes in a week and often they belong to the Indian Air Force or the army.

Not surprisingly, today, Friday’s chopper crash in Sitapur, Uttatar Pradesh that went down engulfed in fire with seven IAF personnel including two officers, was an ALH Dhruv helicopter. It was flying from Bareilly to Allahabad.

Why is it that only military helicopters crash in India?

The HAL Dhruv, manufactured by India’s Hindustan Aeronautics Limited (HAL), was designed with assistance from MBB in Germany. As of October 2013, more than 150 HAL Dhruv have been produced for different customers.

In 2005, following a crash landing of a Dhruv, the entire fleet was grounded when it was discovered to have been caused by excessive vibration in the area of the tail rotor. It forced a redesign of the tail rotor, which incorporated new materials in addition to changes in design methodology. After recertification, it was returned to service shortly after March 2006.

In September 2010, it was reported that the Dhruv’s Integrated Dynamic System (IDS), which transfers power from the Shakti engines to the helicopter rotors, was not performing optimally. HAL engineers said it had reduced speed, high-altitude capability, and the life of the IDS, requiring frequent replacement. This has affected the cruising speed which has been restricted to 250 km/h and reduced high-altitude performance. With the Italian aerospace firm Avio’s help, the problem was fixed.

India’s army and air force — strapped for helicopters — have no choice but to accept and fly Dhruvs, even though they are performing below par and metal keeps chipping off inside the IDS. HAL has itself implemented six changes inside the IDS so far.

Another report alleged the Dhruv has been “rushed” through the test-phase. A report in Business standard in September 2010 said the HAL developed the Dhruv in haste and introduced it into operational service without adequate testing.

Quoting a Ministry of Defence official, the report said: “The IAF asked for about 75 design changes while HAL was developing the Dhruv. This prevented a coherent and systematic design process. And, thereafter, HAL was too eager to introduce the Dhruv into service. It has now emerged that it was unwise of HAL, and of the IAF, to operationalise the Dhruv before the design was fully stabilised.” There it is!

via Microfinance Monitor