These latter indications along with the discovered positions of the two irreversible-action stabilizer jackscrews reflect that the stabilizer drive unit had been operating in an abnormal condition over a period of time, then failed while being operated in an ANU direction from the full, or near full, AND position.

The Board determines the probable cause of this accident was the degradation of aircraft stability characteristics in turbulence, because of abnormal longitudinal trim component positions. Moderate to severe turbulence existed in the area at the time of the accident.

One of the removed jackscrews had a rusted thread and the lubrication on the bearing was poor. This was done by utilizing a DC-8 flight simulator programmed to duplicate the weight and c. g. N8607 and the takeoff conditions of Moisant Airport at the time of takeoff. ​The data available[8] indicate that for the 2-degree AND condition the stick forces necessary to hold the aircraft in steady-state 1-6 flight range from 33 pounds (PTC retracted) and zero pounds (PTC extended) at 242 knots, to 55 pounds (PTC retracted) and 22 pounds (PTC extended) at 320 knots. In this case the sleeve from which the indicator plunger extends, had been raised to the degree that it was flush with the plunger at the minimum position of the actuator as installed.

GPS based tracking technology of light aircraft, helicopters and gliders. The recovered reverse assemblies indicated use of reverse thrust at impact. He wrote that "It does not center control wheel with gust lock on and feel is not in proportion to other aircraft."

Following a normal U. S. Customs inspection of the aircraft and baggage, all passengers for the continuing flight boarded the aircraft.

The Nos. This search rapidly assumed enormous proportions as additional electronic and sonic underwater detection gear became available.

We use our own cookies to store session and settings data.

The Board discovered a parallel to the above case in the history of N8607. The DC‐8, Flight 304, left New Orleans International Airport for Atlanta at 3:01 A.M., Eastern Standard Time, and disappeared from radar at 3:10. The fact that the engines were being operated in the reverse thrust regime is in itself indicative of an attempt by the crew to recover from a diving upset into a steep dive, attributed to the successful recovery to the use of a previous thrust which, in addition to providing drag forces, produces a noseup pitching moment.

NEW ORLEANS, LOUISIANA If the attitude indicator presents "geared-down" pitch attitude information to the pilot, it likewise presents "geared-down" pitch rate information and could cause a degree of over-control when the pilot attempts to restore the aircraft to normal attitudes. In the work completed it has been shown that the simulator, without any pilot control inputs, can fly through the most severe National Severe Storms Project (NSSP) gust/draft history without excessive g excursions, large airspeed variations or great altitude changes but with, in many cases, large changes in pitch attitude.

1965 →, List of accidents and incidents involving commercial aircraft, "Aircraft Accident Report: Eastern Airlines, Inc., Douglas DC-8, N8607, New Orleans, Louisiana, February 25, 1964", British Eagle International Airlines Flight 802, Airliner accidents and incidents in Louisiana, Airliner accidents and incidents caused by pilot error, Aviation accidents and incidents in the United States in 1964, Eastern Air Lines accidents and incidents, Accidents and incidents involving the Douglas DC-8. His FAA first-class medical certificate was dated August 27, 1963. Calculations based on flight recorder data of the DC-8 turbulence upset which occurred with the same first officer at the controls showed that the aircraft reached a nosedown attitude of about 40 degrees. The pilots quickly found this characteristic could be overcome by smaller corrections.

The circuitry of the autopilot will automatically disengage.

An aircraft's position can be estimated for up to 240 minutes after coverage has been lost.

All times herein are central standard time based on the 24-hour clock.

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A Severe Turbulence Mechanical Check of the aircraft at that time revealed only minor damage. [12] Flight tests have shown that the DC-8 speed stability in the climb configuration approaches neutral at speeds above 300 knots when the PTC fails to extend the programmed amount.

Therefore, it is believed that moderate and probably severe wind shear turbulence was encountered by Flight 304 while in the clouds below 5,000 feet. A Douglas DC-8 of Eastern Air Lines, similar to the aircraft involved in the accident, ✪ Lady Chatterley's Lover: Trailer - BBC One, ✪ Iberia A340-600, PIA/TAM/British Airways 777, Virgin Atlantic A340, Qatar A319 at London Heathrow.

In this instance it dropped 1/4 inch and was operated in this position for an extended period of time. This level of force gradient is extremely light[10] and is to a large extent masked by the friction forces of the system which are about ±5 to 6 pounds.

Tabs misrigged in the opposite direction, or for that matter correctly rigged, would have worsened to control difficulties of the aircraft. Based on the evidence contained in the recovered horizontal stabilizer drive unit, and the tests performed by DACO, the Board concludes that the drive unit was installed by EAL maintenance personnel in September 1963, with the support bushing in the inverted position. In his testimony he described that test, "…we left the PTC extended and that was at approximately 220 knots and I trimmed… two degrees aircraft nosedown. It will enhance any encyclopedic page you visit with the magic of the WIKI 2 technology. main content 国際・中国国内航空券の予約・購入、日本-中国直行便、7x24時間サービス、中国東方航空日本公式サイト The lower support bushing has a flange on its outer circumference and when installed properly (flange up) it overlaps the lower bearing and thus provides the vertical and lateral support for the sprocket shaft assembly. Generalizing from a limited number of cases not fully evaluated or clearly understood is usually a technically unsound approach, yet it is still difficult to escape concluding that the phasing relationship between turbulence-induced aircraft motion with control inputs is at least a factor in these occurrences.".

These latter indications along with the discovered positions of the two irreversible-action stabilizer jackscrews reflect that the stabilizer drive unit had been operating in an abnormal condition over a period of time, then failed while being operated in an ANU direction from the full, or near full, AND position.

The Board determines the probable cause of this accident was the degradation of aircraft stability characteristics in turbulence, because of abnormal longitudinal trim component positions. Moderate to severe turbulence existed in the area at the time of the accident.

One of the removed jackscrews had a rusted thread and the lubrication on the bearing was poor. This was done by utilizing a DC-8 flight simulator programmed to duplicate the weight and c. g. N8607 and the takeoff conditions of Moisant Airport at the time of takeoff. ​The data available[8] indicate that for the 2-degree AND condition the stick forces necessary to hold the aircraft in steady-state 1-6 flight range from 33 pounds (PTC retracted) and zero pounds (PTC extended) at 242 knots, to 55 pounds (PTC retracted) and 22 pounds (PTC extended) at 320 knots. In this case the sleeve from which the indicator plunger extends, had been raised to the degree that it was flush with the plunger at the minimum position of the actuator as installed.

GPS based tracking technology of light aircraft, helicopters and gliders. The recovered reverse assemblies indicated use of reverse thrust at impact. He wrote that "It does not center control wheel with gust lock on and feel is not in proportion to other aircraft."

Following a normal U. S. Customs inspection of the aircraft and baggage, all passengers for the continuing flight boarded the aircraft.

The Nos. This search rapidly assumed enormous proportions as additional electronic and sonic underwater detection gear became available.

We use our own cookies to store session and settings data.

The Board discovered a parallel to the above case in the history of N8607. The DC‐8, Flight 304, left New Orleans International Airport for Atlanta at 3:01 A.M., Eastern Standard Time, and disappeared from radar at 3:10. The fact that the engines were being operated in the reverse thrust regime is in itself indicative of an attempt by the crew to recover from a diving upset into a steep dive, attributed to the successful recovery to the use of a previous thrust which, in addition to providing drag forces, produces a noseup pitching moment.

NEW ORLEANS, LOUISIANA If the attitude indicator presents "geared-down" pitch attitude information to the pilot, it likewise presents "geared-down" pitch rate information and could cause a degree of over-control when the pilot attempts to restore the aircraft to normal attitudes. In the work completed it has been shown that the simulator, without any pilot control inputs, can fly through the most severe National Severe Storms Project (NSSP) gust/draft history without excessive g excursions, large airspeed variations or great altitude changes but with, in many cases, large changes in pitch attitude.

1965 →, List of accidents and incidents involving commercial aircraft, "Aircraft Accident Report: Eastern Airlines, Inc., Douglas DC-8, N8607, New Orleans, Louisiana, February 25, 1964", British Eagle International Airlines Flight 802, Airliner accidents and incidents in Louisiana, Airliner accidents and incidents caused by pilot error, Aviation accidents and incidents in the United States in 1964, Eastern Air Lines accidents and incidents, Accidents and incidents involving the Douglas DC-8. His FAA first-class medical certificate was dated August 27, 1963. Calculations based on flight recorder data of the DC-8 turbulence upset which occurred with the same first officer at the controls showed that the aircraft reached a nosedown attitude of about 40 degrees. The pilots quickly found this characteristic could be overcome by smaller corrections.

The circuitry of the autopilot will automatically disengage.

An aircraft's position can be estimated for up to 240 minutes after coverage has been lost.

All times herein are central standard time based on the 24-hour clock.

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