N950AL

HISTORY OF FLIGHT

On October 28, 2005, at 2324 Pacific daylight time, a twin-engine Agusta A109E helicopter, N950AL, sustained substantial damage after impacting an object and subsequently terrain during takeoff at the Providence St. Peter Hospital, Olympia, Washington. The helicopter was operated by CJ Systems Aviation Group of West Mifflin, Pennsylvania, under contract to Airlift Northwest of Seattle, Washington. The airline transport pilot, one flight nurse, and the patient were not injured. A second flight nurse sustained minor injuries. Visual meteorological conditions prevailed for the air ambulance flight, which was being operated in accordance with 14 CFR Part 135, and a company flight plan was filed. The flight was originating at the time of the accident, with its destination being the Harborview Medical Center, Seattle, Washington.

In telephone conversations with the NTSB investigator-in-charge (IIC), and according to the Pilot/Operator Aircraft Accident/Incident Report (NTSB form 6120.1), the pilot reported that following his preflight activities, and after both engines were online (started) and the avionics were on, "...I turned both engine controls to flight and verified that there were no caution lights, except the parking brake. I set the rotor rpm switch to 102% position and looked for the little yellow band at the top of the rotor rpm indicator. I said 'coming up' and pulled enough collective to bring the aircraft to a hover for just a second while I verified 102% RPM and caution lights out, then started pulling collective for takeoff power and added forward cyclic to start [the] climb-out. Just as I reached the point of no return I heard 'ROTOR LOW' in the headset and the aircraft began to settle. I started to look back inside at the instruments, but realized that the aircraft was settling fast and focused my attention back outside because there was a building in front of me. I reached for the Limit Override button with my thumb but could not find it. Then it was too late. I realized the aircraft was going to impact the building in front of me and there was nothing I could do to prevent it." The pilot stated that the next thing he remembered was the aircraft facing 180 degrees from the takeoff track and rolling over on its right side. The pilot reported that about 5 or 6 seconds after the aircraft had come to a stop he managed to reach the engine control knobs and shut down the engines. The pilot stated that after he confirmed that both flight nurses and the patient were all right, he shut off the electrical power and exited the helicopter. The pilot further stated that the wreckage was contained in a garden space between the main hospital building and an adjoining building. The pilot reported that the space was not more than 40 feet wide and the aircraft had impacted the side of the adjoining building and fallen to the ground beside it facing southwest. There was no post-crash fire. The pilot also reported that prior to the takeoff he had completed the company's' DO/VERIFY checklist procedure.

In a statement submitted to the IIC dated November 28, 2005, one of the two flight nurses on board the helicopter, who was seated in the forward aft facing seat, reported that as she and the other flight nurse were preparing the patient for the flight, the pilot was starting the helicopter's engines. "The helicopter sounded like it usually does during this process. [The pilot] asked if we were ready to depart and each of us responded in the affirmative. As we lifted from the helipad there was a distinct and dramatic reduction in the noise we usually hear, and we immediately seemed to lose our lift. We had moved forward on the helipad and I could see we were partially over the small wall that goes around the perimeter of the helipad. At this point it was clear that we were going to crash. I could see that we were not only losing lift, but we were actually losing what little altitude we had. There was violent shaking and violent noise for several seconds, and then we impacted the ground." The nurse reported that after the helicopter came to rest she assessed that the other nurse and the patient were okay, and that the pilot was talking and shutting the aircraft down.

In a statement submitted to the IIC, dated April 21, 2006, the second flight nurse, who was seated in the aft forward facing seat, stated that she was able to see the monitors and gauges in the front of the aircraft; she noted no anomalies. The nurse reported that the helicopter lifted off approximately 5 to 10 feet and prepared to move forward in a nose down attitude. The nurse stated, "At that point I heard a noise that sounded like powering down. I also heard the verbal warning stating 'rotor low, rotor low', as we began to fall. The aircraft's underside made contact with the side of the helipad structure as we were falling and the aircraft rotated prior to hitting the ground. After the impact we waited until the rotors had stopped turning. I have no recollection of the events that transpired until I was inside the emergency room."

The aircraft was recovered and transported to a secured storage facility for further examination by representatives of the NTSB, Federal Aviation Administration, Pratt and Whitney Canada, CJ Systems Aviation Group, Airlift Northwest, and Agusta Aerospace.

PERSONNEL INFORMATION

The pilot held an airline transport pilot certificate for helicopters, a BV-234 type rating, and commercial privileges for airplane single-engine land, airplane multiengine land, and instrument airplane. The pilot reported a total flight time in all aircraft of 8,014 hours and 6,911 hours total time as pilot-in-command. The pilot also reported 7,923 hours total time in all helicopters, 6,897 hours as pilot-in-command of helicopters, 15 hours total time in make and model, and 1625 hours in the Agusta A109AII helicopter. The pilot reported that he had flown 71 hours in the preceding 90 days, 20 hours in the last 30 days, and 1 hour in the last 24 hours. The pilot was issued a first class medical certificate on August 3, 2005, with a limitation for corrective lenses.

According to records supplied by CJ Systems, the pilot was hired by the company on April 17, 2000. The pilot successfully completed an Airman Competency/Proficiency Check on the Agusta A109AII aircraft on April 26, 2000. The pilot subsequently completed Agusta A109E differences training on July 7, 2005, followed by successfully completing the Agusta A109E Initial Flight Course on August 16, 2005, which consisted of 3.5 hours of flight training and an evaluation of maneuvers.

AIRCRAFT INFORMATION

The red and white helicopter, a 2004-model Agusta A109E aircraft, serial number 11628, was powered by two Pratt & Whitney Canada engines (serial numbers PCE BC 0500 and PCE BC 0501), each rated at 735 horsepower. The aircraft was equipped with a Full Authority Digital Engine Control (FADEC) system. According to the manufacturer the FADEC system ensures accurate control of the engine output speed and fast response changes in power demand. The helicopter was also equipped with a new ergonomic cockpit design, multifunctional liquid crystal display, a four-bladed fully articulated main rotor system, and a retractable landing gear.

According to the manufacturer, the helicopter's FADEC system incorporates all control units and accessories for complete automatic and manual control of the engine. It is comprised of three main components, the Fuel Management Module (FMM), the Electronic Engine Control unit (EEC) and the Permanent Magnet Alternator (PMA).

The FMM is an electro-mechanical unit driven by the accessory gear box, which governs the fuel flow through the entire operational envelope of the engine. It can operate in the automatic mode (fuel flow controlled by the EEC) or in the manual mode mechanical back-up, (fuel flow controlled by the power lever angle of the FMM through the Engine Control Levers in the cockpit overhead panel and/or through the Engine Control Trim Switches on the collective stick). The FMM installed on the accessory gear box incorporates an electrical interface with the EEC, and through the EEC with the Integrated Display System (IDS).

The PMS is an engine driven power unit which provides electrical power to both the EEC and the FMM during normal engine operations. The backup power to the FMM and the EEC is provided by the aircraft's electrical system.

The EEC is a single channel digital electronic control unit, which, in conjunction with the FMM and a network of sensing devices, provides control of the engine over the complete operating range, achieved by modulating the fuel flow for each particular operating condition. The EEC controls the engine gas generator and power turbine speeds in response to the load demanded by the rotorcraft's rotor system. The EEC also controls fuel flow from engine start to full power within the established limits, and also controls the engine for normal flight, with selection provided through the two console mounted three (3) positioned Power Management Switches (PMS). The three modes are: OFF - fuel shutoff by the shutoff solenoid; IDLE - control governs the power turbine (Npt) at a speed of approximately 65 percent Npt; and FLT - control provides power turbine/main rotor speed governing at the nominal governing speed (100 percent or 102 percent). An ENGINE OUT warning is automatically displayed on the #1 Electronic Display Unit together with an Aural Warning and the Master Warning Light anytime an engine out condition exists (N1<50%). The ENGINE OUT warning is suppressed if the related PMS is set to the OFF position.

A one engine inoperative (OEI) advisory mode is also automatically presented on the #1 Electronic Display Unit when an ENGINE OUT condition exists or when one of the two ENG MODE switches is set to OFF. The OEI advisory mode is also prese...