 In 1943 a British Court of Inquiry investigated the crash of Sikorski 's Liberator II AL523 , but was unable to determine the probable cause , finding only that it was an accident and the " aircraft became uncontrollable for reasons which cannot be established " . A popular theory was insufficient technical maintenance leading to jamming aircraft controls . Despite this finding , the political context of the event , coupled with a variety of curious circumstances , immediately gave rise to speculation that Sikorski 's death had been no accident , and may in fact have been the direct result of a Soviet , British or even Polish conspiracy . 
 In 1943 a British Court of Inquiry investigated the crash of Sikorski <a href='null_genetive' title='1'><mark>'s</mark></a>Liberator II AL523 , but was unable to determine the probable cause , finding only that it was an accident and the " aircraft became uncontrollable for reasons which cannot be established " . A popular theory was insufficient technical maintenance leading to jamming aircraft controls . Despite this finding , the political context of the event , coupled with a variety of curious circumstances , immediately gave rise to speculation that Sikorski <a href='null_genetive' title='2'><mark>'s</mark></a>death had been no accident , and may in fact have been the direct result of a Soviet , British or even Polish conspiracy . 
In 1943 a British Court of Inquiry investigated da crash of Sikorski  Liberator II AL523 , but was unable to determine the probable cus , finding only that it was an accident and tda" aircraft became uncontrollable fa reasons which cannot be established " . A popular theory was insufficient technical maintenance leading to blastin aircraft controls . Despite this finding , thdaolitical context of the event , coupled with a variety of curious circumstances , immediately gave rise to speculation dat Sikorski  death had been no accident , and may in fact have been thedarect result of a Soviet , British or even Polish conspiracy .