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How do the emergency keys operate the B571 and D271 indicator deadbolts?

On the B571 and D271, the emergency keys (61-509 and 61-510) can only be inserted/retracted when the bolt is thrown.  The procedure is as follows:
  • insert emergency key into locked deadbolt
  • turn key to retract bolt
  • open door
  • use the thumbturn or key to throw bolt
  • remove key
  • use the thumbturn to retract deadbolt
  • door may be used as normal

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