; and (D) improve timely location of the aircraft, accident site, and survivors. (15) The NTSB safety recommendations do not dictate the technology that must be used to achieve these safety goals but does cite at least two acceptable technologies to meet the requirement, to include automatic deployable flight recorder systems and transmission of flight recorder data systems. (16) Automatic deployable flight recorder systems combine a FDR, CVR, and ELT into one crash-hardened, survivable black box , which releases from the aircraft upon crash impact with land, or water, and in the event of in-air explosion, enabling it to avoid the crash impact site and float indefinitely in overwater accidents. The floating deployable recorder sends a distress alert tracking signal to the free, global constellation of Search and Rescue (SAR) satellite transponders known as COSPAS–SARSAT, immediately providing the position of the downed aircraft at point of impact to assist in the location of survivors and the location of the floating deployable FDR and CVR black box for rapid recovery and analysis. (17) Transmission of flight recorder data involves monitoring aircraft flight parameters and triggering satellite transmission of critical flight data when the parameters deviate from their normal operating envelope and can also assist in identifying the location of a downed aircraft. (18) Use of either the automatic deployable flight recorder or transmission of flight recorder data technologies, when used to supplement the current mandatory onboard fixed FDR and CVR, will provide investigators more timely access to information, offering valuable insight into the circumstances at the end of an accident flight while helping to focus an investigation during the search for survivors, and recovery of traditional fixed recorders and wreckage from underwater crash sites. (19) CVRs provide unique information with which the NTSB can conduct more thorough investigations to target safety recommendations more effectively. The current 2-hour CVR