FOCUS-Saving the Titanic: India took control of IL&FS to avert "catastrophic" damage - gov't

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* India took rare step of saving IL&FS as it feared contagion

* Nearly two-thirds of IL&FS debt was from public sector banks

* Gov't says it feared damage to economy and financial markets

* Gov't accuses IL&FS's previous board of mismanagement

* IL&FS collapse could have sparked debt market selloff-gov't

By Aditi Shah and Aditya Kalra

NEW DELHI, Oct 5 (Reuters) - The Indian government said it was forced to take control of ailing shadow banking firm Infrastructure Leasing & Financial Services (IL&FS) as it feared its collapse would cause "catastrophic" damage to the financial markets and the economy, a court filing shows.

In the largest intervention of its kind, India this week replaced the board at IL&FS, a construction and infrastructure firm that had defaulted on a series of repayments to creditors as it struggled under a debt pile of more than $12 billion.

The company's downfall has undermined confidence in India's shadow banking sector, triggered declines in the nation's stock and bond markets, and stoked fears of outflows from the mutual fund industry which has a large exposure to such financing companies.

In a 36-page petition filed by India's Corporate Affairs Ministry at the company law tribunal, the government does not pull its punches, referring to IL&FS as a "titanic ship" and accusing its board of mismanagement.

The petition, which sought permission for the board takeover and the right to replace executives and was approved by the tribunal, has not been made public, though some media outlets have quoted from parts of it in recent days. Reuters was able to review the entire petition.

Saving IL&FS was critical as nearly two-thirds of the firm's accumulated debt of 910 billion rupees ($12.36 billion) was from public sector banks. Moreover, IL&FS accounts for 16 percent of the total exposure of banks to India's non-banking financial companies (NBFCs), the government said in the petition.

"The future impact of more defaults in the group may be catastrophic for the (country's) financial stability," it said.

"Any impairment in its ability to finance and support the infrastructure projects would be quite damaging to the overall infrastructure sector, financial markets and the economy," the government added.

CRITICAL TIMING FOR MODI

IL&FS, whose top shareholders are state-run Life Insurance Corporation, the State Bank of India, Japan's Orix Corp and the Abu Dhabi Investment Authority, is one of the largest of thousands of NBFCs which have mushroomed in India in recent years.

The NBFCs, that currently manage an aggregate loan book of nearly $300 billion, have played a key role in lending growth in India as the main banking sector struggled to tackle a bad-debt burden of $150 billion.