The measure of PFR-193 reliability is expressed in the commonly knowi 

 MTBF (Mean Time Between Failures). The prediction analysis using component 

 failure rates from NAVSHIPS 93820 shows that this instrument has a theo- 

 retical MTBF of 3hOO hours. This number was obtained by identifying all 

 the parts with their respective failure rates, which then were summed for 

 the equation: 



/i. = n 



where 



Qj^ = MTBF in hours 



K. = adjustment factor 



X = reliability of any unit 



Figure Ik shows the breakdown of units within the recorder and their 

 calculated failure rates . 



OTHER APPLICATIONS 



The PFR-193 can easily be modified for application in such areas as: 



ASW Systems - 



- Tracking 



- Detection 



- Classification 



Facsimile - 



- Weather Maps 



- Messages 



- Pictures 



Oceanographic Data Recording - 



- Tenperature 



- Velocity 



- Current 



In fact, this recorder can be adapted to meet many other require- 

 ments where utmost precision is necessary. 



201 



