be flying blind

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be flying blind

1. To be flying an airplane without the ability to see, relying on the plane's instruments instead. After the volcano sent that huge plume of ash into the air, the pilots were flying blind for nearly an hour.
2. By extension, to be doing something based on guesswork, intuition, or without any help or instructions. As this is our first attempt at building an app, we'll be flying blind as we figure out how to get things working correctly. I've never filed my own taxes before, so I'm sort of flying blind.
See also: blind, flying
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

be flying blind

If someone is flying blind, they do not have any knowledge to help or guide them in a particular situation. We will be flying blind into a world we don't know anything about. Without this information, the company is flying blind and likely to crash. Note: A pilot is flying blind when they are piloting an aircraft without using visual navigation, but relying solely on their instruments.
See also: blind, flying
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012
See also:
References in periodicals archive ?
Preliminary reports from flight recorder data indicate that smoke in the cockpit obscured the visibility of pilots who were overheard to be flying blind; the aircraft eventually crashed killing both pilots.