20020118001289A

(-23) Preliminary investigation indicates aircraft lifted off 12th story helipad at 0024. A/c started a right turn in gusty wing conditons and struck the building between the 13th and 14th floor. At this point it appears one tail rotor blade sheared off and one main rotor blade sheared off causing loss of control. It also appears the tail boom separated due to contact with the building. The a/c then continued into the side of another part of the building and fell to the ground. The aircraft exploded on impact and was destroyed. (.4) history of flight: on January 18, 2002, at 0024 eastern standard time, an mbb (Eurocopter) bk 117 A-3 helicopter, N626MB, operated by cj systems aviation group, was destroyed when it collided with a brick facade during a take-off from a roof-top helipad at the university hospitals of Cleveland, Cleveland, Ohio. The certificated commercial pilot and the flight nurse were fatally injured, and the paramedic was seriously injured. Night visual meteorological conditions prevailed, and no flight plan was filed for the medevac flight conducted under 14 CFR part 91. At 0017, the medevac crew was notified of an emergency patient pick-up at the lake west hospital, eastlake, Ohio. According to the paramedic, he and the flight nurse gathered their medical equipment and walked out to the helicopter, which was on the primary (eastern most) helipad, facing southwest. They stowed their equipment onboard while the pilot conducted a pre-flight inspection of the helicopter. After he stowed his medical equipment, the paramedic conducted his own pre-flight inspection of the helicopter, then sat in the left front pilot seat for departure. With the crew onboard and the engines started, the pilot positioned the power levers for flight. As the helicopter ascended vertically, the pilot turned the nose of the helicopter to the right (northwest), so it faced a wall that extended 10-feet above the height of the helipads. The paramedic contacted dispatch and the pilot contacted burke lakefront airport control tower. When the helicopter was approximately 20-feet above the helipad, while the paramedic was programming the panel mounted GPS, he felt a "sudden gust" of wind push the helicopter from directly behind. He was not alerted by the wind gust, since it was normal to encounter them when departing from this heliport. The paramedic said he was not aware of anything unusual with the flight until he looked up, and noticed the helicopter's close proximity to a 16-floor brick building, which was located at the northern corner of the heliport and extended above the height of the helipad by 4 floors. He said the nose of the helicopter was also positioned further to the right than before. The paramedic yelled, "building, building, building!" To alert the pilot. The pilot then made a rapid right cyclic input, which caused the helicopter to make a "hard nose over to the right." The paramedic said there was not enough room for the helicopter to complete the approximately 180-degree turn and clear the 16-floor building. The main rotor blades struck the 16-floor building first, followed by the left side of the helicopter. Then, the helicopter fell about 13 floors to a circular driveway at ground level. Additionally, the paramedic did not see or hear any warning lights, warning horns, or unusual noises, and was not aware of any mechanical problems with the helicopter. He also said that the pilot did not report any problems during the flight. A trooper with the Ohio state highway patrol (oshp) interviewed the paramedic on January 22, 2002. During the interview, the paramedic stated: "everything was normal and [the pilot] pulled pitch and we started to lift off. We were maybe about 20 feet off the pad when I felt a slight nudge. Almost instantly the tail started pulling left, the nose pulled right and went down in an arc motion. I started yelling, 'building, building', and we went into the building. I could see that [the pilot] was fighting to control it." When asked if there were any weather concerns on the night of the accident, the paramedic stated that it was, "... Clear as a bell. There was some wind gusts but it was cold as heck." An officer with the Cleveland police aviation unit stated that he flew two missions on the evening of January 17, 2002. He reported that when the flight ended around midnight, the ceilings, visibility, and flight conditions were good. The winds at the surface were at least 15 knots from the southwest throughout the evening, but were gusting to approximately 25 knots during the first flight. The surface winds calmed down during the second flight; however, the winds at 500 feet above ground level (AGL) remained brisk throughout theevening. The wind speed was at least 25 knots and gusty. The officer also stated that he encountered light "mechanical turbulence" during the flights, which was due to the south/southwesterly winds and the high ground that surrounded the Cleveland metro area. Additionally, the officer stood on the heliport about 0300 on the morning of the accident and noted that it was still very windy from the west/southwest and the "mechanical turbulence from the building was evident." A federal aviation administration (FAA) inspector also examined the heliport about 0300 on the morning of the accident. According to the inspector, the winds were out of the southwest, and were gusting between 20 and 30 knots. He said that as he walked around the edge of the heliport, he caught himself several times backing away from the edge due to the wind gusts. The inspector also stated that the wind seemed to swirl around the heliport. According to the operator's dispatch records, the helicopter lifted off the helipad at 0024. Review of air traffic control communications revealed that the helicopter contacted the burke lakefront control tower at 0024. The tower responded seven seconds after the initial call and attempted to contact the pilot, but there was no response. There were no distress or emergency calls made from the crew of the helicopter. The accident occurred during the hours of darkness, approximately 41 degrees, 03 minutes north latitude, and 081 degrees, 36 minutes west longitude.