Fallback:
Step 1: In effect daily from I believe 0800 to 2300 - no response to ERS boxes were there is no contact made.
Step 2: In addition to Step 1, only 1 engine is sent out on a mechanical pull box. Other street box assignments may also be adjusted accordingly. I have never heard Fallback 2 being implemented.
Step 3: In addition to Step 2, only minimum response of 1 engine, 1 truck, and 1 battalion on a reported structural box with single source. Additional companies may be assigned on the discretion of the dispatcher or requested by the battalion chief should additional information be received. Usually implemented when a borough is experiencing a shortage of available companies and multiple open response areas.