The test Testing supervisor then failed to follow procedure , creating Creating unstable operating Being_in_operation conditions that , combined Cause_to_amalgamate with inherent RBMK reactor design flaws and the intentional disabling Destroying of several nuclear reactor safety systems , resulted in Causation an uncontrolled nuclear chain reaction .

Control Control of the aircraft was subsequently lost Earnings_and_losses , resulting in Causation a stall and uncontrolled descent into the sea .

according to the official air force report , the aircraft experienced Change_sentiment an uncontrolled decompression that required Preventing_or_letting it to descend to in order to lower the cabin altitude .

The plane ran out of Expend_resource fuel over South Dakota and crashed Catastrophe into a field near Aberdeen after an uncontrolled descent .