Cessna 425 Conquest

The flight was cleared for a night ILS approach and advised that tower at destination had closed. Tower had reported at closing that fog was forming and the flight was advised of the fog. The aircraft was located on a remote part of the airport the next morning. The ELT had activated but the signal was weak due to crash damage. Passenger said they never saw runway lights, only taxi lights, and that pilot attempted to perform a go-around. Gear was retracted and aircraft hit level grassy area in a near level attitude. The pilot was not wearing a shoulder harness. The pax crouched in the aisle next to the pilot, helping him find the runway, not wearing restraining belts. No published approach plate for ILS procedure for that runway was found in aircraft. Toxicological report revealed pilot had 3 mcg/ml dextromethorphan, an ingredient found in over counter cold remedies. According to report, levels of that substance in blood greater than 0.1 mcg/ml was sufficient to cause drowsiness.

The twin engine aircraft was engaged in a charter flight from Bern to Düsseldorf, carrying one pilot and seven employees from the textile industry. Takeoff was completed from runway 32 partially covered with wet snow and after liftoff, the aircraft encountered difficulties to gain height and passed just over trees located from either side of the Aar River. Then the aircraft lost height, initiated a left turn then stalled and crashed in a snow covered field located near a wood, about 1,250 meters northwest of runway 14 threshold and 600 meters to the left of its extended centerline. The aircraft was destroyed and all eight occupants were killed.

During arrival, the pilot advised ARTCC that the destination airport appeared to be covered with fog. She then canceled her IFR flight plan. According to ground witnesses, the aircraft made several passes over the airport. Witnesses also reported that the horizontal visibility was nil, but they could see blue sky directly above. During the last pass, the aircraft crossed over the approach end of the runway with the gear and flaps extended, angling to the left of the runway heading. Moments later, witnesses heard the engines go to full power, then silence followed. The aircraft was found where it impacted rising snow covered terrain approximately 1/8 mile south of the midpoint of the airport. There was evidence that the aircraft was in a steep descending, right wing low attitude when it crashed. No preimpact part failure/malfunction was found. A passenger was seriously injured while five other occupants were killed.

The aircraft involved was experimentally configured with 4-bladed props and was on a test flight to determine handling characteristics following a throttle chop to idle power at 50 feet agl. This maneuver had been accomplished twice on the test flight without incident. On the third landing, the pilot later stated, that he retarded the throttles more briskly than on previous approaches. Observers on the plane and on the ground then saw a yaw and a wing drop. The right gear struck the runway first, followed by the left and nose gears. All three gear then sheared off. The aircraft slid to a stop off the runway 975 feet from initial impact. A postaccident teardown of the props revealed no preexisting misadjustments or abnormalities.

The pilot stated that he was utilizing the autopilot and flight director to execute the ILS approach to runway 32. The autopilot was tracking the localizer while the pilot controlled the rate of descent along the glideslope with pitch command wheel on the autopilot, using the command bars as a steering reference in addition to the raw data glideslope needle on the hsi. All seemed normal, according to the pilot, until the aircraft struck trees about 450 feet above airport elevation two miles short of the runway and came to rest on the localizer centerline. A zero feet ceiling with an eighth mile visibility existed at the airport. During the investigations, it was determined that the 1000 a ifcs will not provide vertical steering commands as operated by the pilot, but is driven by the pitch wheel. This is not specifically stated in the poh. The pilot had flown extensively with the 800 series ifcs which will provide the expected steering commands. Extensive damage precluded a functional test of the raw data glideslope needle. Both occupants were slightly injured.

During arrival, there were indefinite delays at White Plains, NY, so the pilot diverted to Newburgh, NY. He was vectored for an ILS runway 09 approach. While en route, the pilot requested and was given the ILS frequency, minimums for the approach, the airport elevation (491 feet msl), the Newburgh weather and the frequency for the outer compass locator (even tho, current approach charts were on board). He was cleared for the approach, but the aircraft hit trees and crashed, 2.58 miles west of runway 09. Elevation of the crash site was about 580 feet. The minimum descent altitude (MDA) for the approach was 682 feet. An exam of the wreckage revealed no preimpact part malfunction or failure. The pilot was required to wear lenses to correct his vision. The area forecast called for icing, turbulence, low level wind shear, low ceilings, rain, drizzle, fog and a chance of light freezing rain/drizzle. Reportedly the pilot received a full weather briefing, but was not briefed on sigmets Juliett 7 and Lima 4 which called for moderate to severe turbulence and low level wind shear and occasional moderate to severe mixed/clear icing in clouds and precipitations below 8,000 feet.

On approach to Natchez-Hardy Ander Field Airport, the pilot encountered limited visibility due to low ceiling, fog and night. Following an incorrect altimeter setting, the twin engine airplane descended too low until it struck the ground and crashed. The pilot, sole on board, was killed.