Narrative:

Prior to boarding; we were under maintenance due to a possible hydraulic leak. The mechanics noticed the fluid on the ground; had the flight deck run pressure checks and then later gave us clearance to operate within 15 minutes. Myself; nor the B & C fas felt safe operating the flight with knowing that there was a (major) hydraulic leak. The captain said that maintenance gave the ok saying we were good to go. I was worried that the AC wasn't properly evaluated while under maintenance and that if the flight deck spoke up more; this incident could've possibly been prevented. Just as the captain announced: flight attendant (flight attendant) prepare for take-off; there was a loud shrieking noise followed by a very strong fume odor. I notified the flight deck and made an announcement to the passengers. The captain initiated an evacuation of the aircraft. At that point; it was too late to do a full cycle of evacuation commands because the passengers were already in the galley ready to exit the aircraft. I used my hand to hold them back and commenced with come this way; leave everything.as a suggestion; I would recommend that the commands be amended to incorporate the old commands of stand back until the slides fully deploy.I also don't know the recommendation for this; but we need to be sure that passengers are willing to stay at the bottom of the slide to help people off and away from the aircraft. The majority of passengers ran away in fear. At least; two times I found myself asking more people to help at the bottom.

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Original NASA ASRS Text

Title: A320 cabin crew reported a failure in the hydraulic system while taxiing resulted in smoke in the cabin and a subsequent call by the Captain to evacuate.

Narrative: Prior to boarding; we were under maintenance due to a possible hydraulic leak. The mechanics noticed the fluid on the ground; had the flight deck run pressure checks and then later gave us clearance to operate within 15 minutes. Myself; nor the B & C FAs felt safe operating the flight with knowing that there was a (major) hydraulic leak. The captain said that maintenance gave the ok saying we were good to go. I was worried that the AC wasn't properly evaluated while under maintenance and that if the flight deck spoke up more; this incident could've possibly been prevented. Just as the captain announced: Flight Attendant (FA) prepare for take-off; there was a LOUD shrieking noise followed by a very strong fume odor. I notified the flight deck and made an announcement to the passengers. The captain initiated an evacuation of the aircraft. At that point; it was too late to do a full cycle of evacuation commands because the passengers were already in the galley ready to exit the aircraft. I used my hand to hold them back and commenced with come this way; leave everything.As a suggestion; I would recommend that the commands be amended to incorporate the old commands of stand back until the slides fully deploy.I also don't know the recommendation for this; but we need to be sure that passengers are willing to stay at the bottom of the slide to help people off and away from the aircraft. The majority of passengers ran away in fear. At least; two times I found myself asking more people to help at the bottom.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.