The airplane's nose dropped below the horizon and the airplane descended into the ground in a nose low attitude.
The flight crew became incapacitated for undetermined reasons and lost control of the airplane.
The flight departed Cleveland-Hopkins International Airport, Ohio, as Night Air 4 at 2200 eastern daylight time.
All three occupants were killed. Performance data indicated more runway surface was required for a safe landing on a wet runway without anti-skid assistance. He saw a white light traveling down the runway followed by an orange fireball and flames. At liftoff, the airplane encountered difficulties to gain height. These illusions, which made the pilot think that he was higher than his true position, were made more acceptable to him because of a strong possibility of an erroneously high indication on his altimeter.
All of the plans requested flight level (FL) 410 as an en route altitude.
N866JS departed Richmond about 2128 with the two pilots aboard, and arrived at Standiford Field in Louisville at 2228 after a routine flight. On May 5, 1980, an unmodified Gates Learjet 23 (N866JS) was operated by Kennedy Flite Center, Richmond, Virginia, on a purported crew training flight.
The second flight plan called for a flight of 1+29 hours from Louisville to Gainesville with the pilot, copilot, and six passengers aboard. Crashed into trees and caught fire short of the runway; illusions produced by the lack of visual cues during a circling approach over unlighted terrain at night to a runway not equipped with approach lights or other visual approach aids. One person said aircraft went out of control before impact; another said it was 'in or on the edge of stalled flight.'
The airplane operated on a flight from Detroit-Metropolitan Wayne County Airport, MI (DTW) to Pellston-Emmet County Airport, MI (PLN). Production ended in 1966 after 101 aircraft had been delivered. There were four passengers and two crew members on board. At liftoff, the airplane encountered difficulties to gain height. He stated that he reached for the crash phone when he saw the wings rocking because he was concerned about the safety of the aircraft. Both pilots were seriously injured and the aircraft was destroyed.
The braking sequence of events described by the pilot resembled dynamic hydroplaning where there was a complete loss of braking effectiveness rather than an anti-skid malfunction. On October 13, 1964, the first production aircraft was delivered. He observed the approach to runway 33 and stated that he thought the aircraft was landing farther down the runway than normal. No preimpact part failure was verified, though impact forces and post-crash fire resulted in extensive damage of the aircraft.
He then saw a ball of fire on runway 33 and immediately sounded the crash alert; the time was 0311:58.
A Learjet 23 plane, registered N235R, was damaged beyond repair in an accident 2,4 km SW of Clarendon, TX, United States of America.
The airplane operated on a flight from Palm Springs Municipal Airport, CA (PSP) to Hollywood-Lockheed Air Terminal, CA (BUR). Both pilots were killed. It was determined that during a test flight, while simulating a failure of the left engine, the crew attempted to takeoff with spoilers extended.
Twenty seven are known to have been lost or damaged beyond repair through accidents, the most recent being in 2008.[4]. The Bureau of Aircraft Accidents Archives (B3A) was established in Geneva in 1990 for the purpose to deal with all information related to aviation accidentology.
About 0311:10, the flightcrew requested that the sequenced flashing approach lights be turned down and the controller asked that the message be repeated. The cause of the uncommanded roll was an asymmetric retraction of the flight spoilers wherein the left spoiler retracted and the right spoiler did not.
As the aircraft turned onto the final approach it rolled inverted and impacted the ground inverted short of runway 32. An uncommanded roll to the right which caused the airplane to roll about 90°and descend into the ground. There were seven people aboard the, PROBABLE CAUSE: "The continued descent below the prescribed approach path profile, for reasons unknown.
The aircraft was equipped with oxygen and pressurization system. On approach to Guatemala City-La Aurora Airport, the crew encountered poor weather conditions and limited visibility. The flightcrew boarded the six passengers, who were friends of the copilot according to the company's flight manager, and the aircraft departed Louisville at 2315. The pilot called the Newport News, Virginia, flight service station (FSS) about 2105 and received a weather briefing for a flight originating in Richmond to Louisville, Kentucky, continuing to Gainesville, Florida, and returning to Richmond. On June 4, 1984, an unmodified Gates Learjet 23A, N101PP, was being operated by Air Continental, Inc., Elyria, Ohio, on a regularly scheduled cargo flight transporting cancelled bank checks under 14 CFR 135. Induced company pressure to deliver the aircraft to its destination is considered to have been a factor in the accident. Out of control, it struck the ground, rolled for several yards and came to rest in flames in a wasteland.
This request was acknowledged, and the approach controller vectored the aircraft to the ILS final approach course, outside of the outer marker, at 2,000 feet. The Bureau of Aircraft Accidents Archives (B3A) was established in Geneva in 1990 for the purpose to deal with all information related to aviation accidentology. He did not hear the aircraft touch down, but did hear a sudden rise of engine noise. Fifteen witnesses, who either heard and/or saw the accident, were interviewed, and with the exception of a few minor points, all of the witnesses described basically the same accident sequence.
A Learjet 23 passenger plane, registered N243F, was damaged beyond repair in an accident 21 km E of Palm Springs Municipal Airport, CA (PSP), United States of America. The Bureau of Aircraft Accidents Archives (B3A) was established in Geneva in 1990 for the purpose to deal with all information related to aviation accidentology. N20EP – on display outside White Industries, Bates City, Missouri. This meant that any Lear Jet 23's without modified Stage 3 noise-compliant engines - or an approved hushkit - were no longer permitted to fly in the contiguous 48 states after that date. At 2341:18, the control tower operator reported to approach control that there had been an accident at the airport. The low-speed/high angle-of attack flight condition precipitated wing rolloff, wingtip strikes, and ultimate loss of aircraft control.
No audible warning was noted on ATC recordings to indicate the cabin altitude had exceeded 10,000 feet, though the aircraft was equipped with such a device.
The first flight took place on 7 October 1963 with test pilots Hank Beaird and Bob Hagen.
The controller cleared the aircraft to land at a March AFB, the nearby airport. It is preliminary and is based on the facts as they are known at this time. The Learjet 23 (originally Lear Jet 23) is an American built six-to-eight-seat (two crew and four to six passengers) twinjet, high-speed business jet manufactured by Lear Jet. On later models (sn: 23-050 and up), p/b needed only to be moved 'off.'
The aircraft was totally destroyed and both pilots were killed. The crew was engaged in a local test flight at Wichita Airport on this first model of the Lear 23. He said that the aircraft was "a bit high" on its approach, but descended to a normal touchdown attitude and altitude with the noise of the engines winding down.
The first flight plan called for a flight of 1+00 hour from Richmond to Louisville with the pilot and copilot aboard. The airplane was on a normal approach to runway 33 with no apparent abnormalities. The controller noted the pilot's speech was slurred and some portions of the conversation were unintelligible.
The flight was operated on behalf of DHL Airways. A lineman noted parking brake (p/b) was set before flight. Approach control identified the airplane, cleared it for a visual approach to runway 33, and at 2336 gave Night Air 4 a turn to position the airplane on final approach at 10 miles from the airport. When the airplane was about 200 feet over the approach lights, an increase in engine thrust was heard and the airplane halted its rate of descent in what two pilot witnesses thought was an apparent attempt to go-around. The Learjet 23 (originally Lear Jet 23) is an American built six-to-eight-seat (two crew and four to six passengers) twinjet, high-speed business jet manufactured by Lear Jet.Introduced in 1964, it was Learjet's first model and created a new market for fast and efficient small business aircraft. After a routine flight, the aircraft arrived at Gainesville Regional Airport at 0044, May 6, 1980, and the passengers deboarded. Inadequate pre-flight preparation and/or planning on part of the flying crew who failed to use or incorrectly used miscellaneous equipment. ", Controlled Flight Into Terrain (CFIT) - Water, NE off Racine-Horlick Airport, WI (RAC) (, THE BOARD, THEREFORE, RECOMMENDED THAT THE FAA INVESTIGATE THE FEASIBILITY OF DESIGNATING A RADIAL OF THE MKE VORTAC AS AN ADDITIONAL METHOD OF IDENTIFYING THE MARION FIX.
Crash of a Learjet 23 in Atlangatepec: 2 killed, Crash of a Learjet 23 in Detroit: 3 killed, Crash of a Learjet 23 in Ansonia: 2 killed, Crash of a Learjet 23 at March AFB: 2 killed, Crash of a Learjet 23A in Guatemala City: 2 killed, Crash of a Learjet 23A in Windsor Locks: 3 killed. The braking systems had evidence that p/b control valve was partially on; brake torque tube contained heat blueing.
Boston Center cleared Night Air 4 to its requested altitude of FL290 and the en route portion of the flight was uneventful. A crew member was rescued while two other occupants were killed. SHOULD THE MKE VORTAC POSSESS THE CAPABILITY OF SUPPORTING THIS REQUIREMENT, THIS RADIAL SHOULD BE MADE A PART OF THE MARION FIX, AND ALL PROCEDURES SHOULD BE MODIFIED ACCORDINGLY. None of the witnesses reported any significant lateral or vertical changes while the aircraft was on short final or during the 90' right turn prior to its descent into the ground. Out of control, it struck the ground, rolled for several yards and came to rest in flames in a wasteland. Ogden, Bob, "Aviation Museums and Collections of North America", 2007, Air-Britain (Historians) Ltd, This page was last edited on 8 October 2020, at 02:48.
Out of control, it struck the ground, rolled for several yards and came to rest in flames in a wasteland.
ntsb probable cause. A Learjet 23 plane, registered N434EJ, was destroyed in an accident 4,4 km SW of Pellston-Emmet County Airport, MI (PLN), United States of America. Therefore, the pilot turned the antiskid system off and continued the rollout with normal braking. Charter Air Center service personnel "topped off" the fuel tanks with 404 gallons of Jet A fuel. The Safety Board could not determine the reason for the right spoiler malfunction.
Examination showed rotational damage occurred in both engines during impact.
On this early model (Learjet 23/sn: 23-45a), p/b had to be released by depressing brake pedals first; pilot handbook did not address this. Introduced in 1964, it was Learjet's first model and created a new market for fast and efficient small business aircraft.