 John Lehman, Secretary of the Navy in the 1980s, told the U.S. Congress that the TF30/F-14 combination was "probably the worst engine/airframe mismatch we have had in years" and that the TF30 was "a terrible engine"; 28% of all F-14 accidents were attributed to the engine.A high frequency of turbine blade failures led to the reinforcement of the entire engine bay to limit damage from such failures.The engines also had proved to be extremely prone to compressor stalls, which could easily result in loss of control, severe yaw oscillations, and could lead to an unrecoverable flat spin.