India's government is considering whether to ground the planes, and said it is investigating all possible causes.

Indian aviation accident authorities are set to release a preliminary report this week into the Air India Ltd. plane that crashed almost a month ago, a person familiar with the plan said.

While the report from Indian investigators could be made public on Friday, the sources with knowledge of the matter cautioned that plans could change and there was no clarity on how much information would be available in the document,