A U.S. Navy safety bulletin was issued July 10 to inspect all older-model Navy and Marine Corps F/A-18 Hornet strike aircraft for possible cracks in an internal support fitting after fractures were discovered in horizontal stabilator actuator support fittings known as bootstraps. said  a Navy spokesman. No mishaps had occurred. The Navy issued the inspection bulletin as a precautionary, risk-reduction measure to ensure our aircraft are structurally sound and safe for operational flight. A bootstrap failure could result in loss of control of the horizontal stabilator, which is the primary flight control surface responsible for maneuvering the aircraft. The aircraft affected by the inspection bulletin include 622 F/A-18A, B, C and D models in service with the Navy and Marine Corps. Newer F/A-18E/Fs and EA-18G Growler aircraft are not affected by the safety bulletin.