The Lady Has No Convictions by Carter Brown

Whitney Kent is the main character in this Carter Brown novel. His father owns Kent Aircraft. They manufacture a jet for the airforce called the F-92X. There is a slight problem with the aircraft, it goes up just fine but comes down even faster. Whitney was set to find out what is wrong with the F-92X. Seems he crashed the prototype while not sober, and was blamed for it.  So there are three choices: sabotage, bugs, or Whitney is a jinx. The Lady Has No Convictions was published in 1956 by Horwitz Publications and was Number 20 in the Numbered Series.