Memo, 1 Nov. 68a, 4-5. “Mayday Squawk” refers to the activation of the SIF/IFF transponder’s "ident" button, which results in the aircraft's blip "blossoming" on the controller’s radarscope. In this instance, the ident feature was used to determine if the radio failure was only one way, and whether the pilot could still receive. The accident Werlich refers to occurred on 4 Oct. involving a B-52H that had lost radio contact during approach.  Due to engine failure, the aircraft spun out of control and crashed killing four crewmembers. The “USAF Accident Report” is included in the Archive section.