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Crack-inspecting drone crashes outside sinking Millennium Tower

SF Gate logo SF Gate 9/10/2018 By Michael Cabanatuan
a person standing in front of a window: Officials with the City and County of San Francisco Department of Building Inspection are requiring Millennium Tower building engineers to evaluate the extent of repairs needed to fix the crack and investigate the condition of the glass panel and adjacent curtain wall system by Friday, Sept. 7, 2018. © Provided by Hearst Communications, Inc Officials with the City and County of San Francisco Department of Building Inspection are requiring Millennium Tower building engineers to evaluate the extent of repairs needed to fix the crack and investigate the condition of the glass panel and adjacent curtain wall system by Friday, Sept. 7, 2018.

A drone being used to inspect a cracked window in the famously sinking Millennium Tower crashed Saturday, according to a report, adding to the building’s notoriety.

a large body of water with a city in the background: The Millennium Tower building rises between Salesforce Tower and 181 Fremont in San Francisco, Calif. on Tuesday, March 27, 2018. Engineers may begin preliminary work soon to stabilize the sinking and leaning Millennium Tower. © Provided by Hearst Communications, Inc The Millennium Tower building rises between Salesforce Tower and 181 Fremont in San Francisco, Calif. on Tuesday, March 27, 2018. Engineers may begin preliminary work soon to stabilize the sinking and leaning Millennium Tower. a large red building with a window: Cracked glass in the Millennium Tower. © Provided by Hearst Communications, Inc Cracked glass in the Millennium Tower.

KPIX-TV reported that a drone deployed to photograph and inspect the crack in the glass on the 36th floor of the building lost its signal and crashed to the street after capturing footage of the crack.

a tall glass building next to a window: Cracked glass in the Millennium Tower.

Cracked glass in the Millennium Tower.
© Provided by Hearst Communications, Inc

No one was injured, according to the TV report, but a young boy was quoted as saying he was nearly hit.

a tall building: The Millennium Tower is seen in front of Salesforce Tower in San Francisco, Calif. on Tuesday, March 27, 2018. Engineers may begin preliminary work soon to stabilize the sinking and leaning Millennium Tower. © Provided by Hearst Communications, Inc The Millennium Tower is seen in front of Salesforce Tower in San Francisco, Calif. on Tuesday, March 27, 2018. Engineers may begin preliminary work soon to stabilize the sinking and leaning Millennium Tower. Salesforce Tower (left) and the Millennium Tower, Friday, Jan. 5, 2018, in San Francisco, Calif. © Provided by Hearst Communications, Inc Salesforce Tower (left) and the Millennium Tower, Friday, Jan. 5, 2018, in San Francisco, Calif.

The crack, discovered last week, could be an isolated break or a sign of a more serious problem caused by the sinking and tilting of the 58-story building, an architectural engineering firm told city officials Friday.

a close up of a door: The Millenium Tower is visible out the windows at the Salesforce Tower in San Francisco, Calif., Thursday, November 2, 2017.

The Millenium Tower is visible out the windows at the Salesforce Tower in San Francisco, Calif., Thursday, November 2, 2017.
© Provided by Hearst Communications, Inc

Since opening in 2009, the Millennium Tower has sunk by around 18 inches and tilted to one side, prompting serious concerns about the building’s structural integrity.

the tower of the city: From left, Millennium Tower, 181 Fremont and Salesforce Tower are seen from Mission Street in San Francisco, Calif. on Tuesday, March 27, 2018. Engineers may begin preliminary work soon to stabilize the sinking and leaning Millennium Tower.

From left, Millennium Tower, 181 Fremont and Salesforce Tower are seen from Mission Street in San Francisco, Calif. on Tuesday, March 27, 2018. Engineers may begin preliminary work soon to stabilize the sinking and leaning Millennium Tower.
© Provided by Hearst Communications, Inc

A report from engineering firm Allana Buick & Bers was filed late Friday with the city’s Department of Building Inspection. It says someone will rappel down the building early next week to photograph the crack from the outside and to tape up the glass as a safety precaution.

Michael Cabanatuan is a San Francisco Chronicle staff writer. Email: mcabanatuan@sfchronicle.com Twitter: @ctuan

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