atlantic southeast airlines flight 2311

Commuter planes aren't required to carry flight recorders, so investigators must rely on physical evidence to find the cause of the disaster. It was noted in the bulletin that transfer tubes which had gold colored splines were not acceptable for use.A copy of the alert service bulletin is available at the following link: (As a result of this accident, the FAA conducted a special certification review of the Hamilton Standard 14RF-9 propeller system. The accident site was about ten thousand feet from the threshold of the runway.The aircraft came to rest in an upright position in a densely forested, flat terrain area. 0000016644 00000 n

The aircraft was destroyed by the impact and the post crash fire.The Pratt and Whitney Canada PW-118 is a turbo-propeller engine consisting of two modules, the turbo-machinery module and the reduction gearbox module, joined to form a single unit. 0000024881 00000 n the fire chief replied, "No sir, you tell her that you love her, because I'm getting you out of here."

The propeller pitch continued to decrease and propeller rotational speed continued to increase, resulting in very high asymmetric drag.

The original aircraft for Flight 2311 had mechanical problems and a change was made to use N270AS. The servo-piston responded and drove the ball screw to decrease the speed of the transfer tube and increase propeller pitch. 0000002265 00000 n The disengagement resulted from the harder, rougher surface of the titanium nitrided transfer tube causing abnormal wear on the softer quill spline. Also during the approach, due to the excessive wear on the quill, the quill and transfer tube became disengaged, allowing propeller pitch to further decrease, and causing the propeller rotational speed to increase above 100%. The investigation found that quill wear was not envisioned during the development and certification of the propeller system.As a result of the determination of abnormal wear of the quill, Hamilton Standard issued an alert Service Bulletin that included a description of ranges of acceptable transfer tube surface characteristics which could be identified by surface color. Only one deferred maintenance item was noted in the maintenance l… A copy of the report issued by the special certification review team is available at the following link: (As a result of the SCR recommendations, Hamilton Standard provided a redesign of the propeller system that incorporated fail-safe features. In an ambulance, Warmerdam consoled a paramedic who believed Warmerdam would soon die. 0000003486 00000 n The paramedic had undressed him to cool him down and pinned his badge to his underwear, to help with identification later. Probable Cause. The acme screw positions the pitch change selector valve, which directs oil to the "increase pitch" or "decrease pitch" side of the piston.Mounted to the front of the propeller hub is a pressure cylinder that contains the hydraulic piston which drives an actuator yoke to change the pitch. 0000004273 00000 n The service bulletin is available at the following link: ( Despite his injuries, Warmerdam survived the plane crash.In addition to Captain Gannaway, seven passengers died as a result of the crash and subsequent fire, including three who died within thirty days of the crash, bringing the official death toll to eight.One of the survivors died of a heart attack eight weeks after the crash. They stated that the airplane would have "become very difficult to control after the propeller reached the 22-degree stop. 0000019324 00000 n On April 5, 1991, Atlantic Southeast Airlines Flight 2311 was making a routine landing. The reduction gearbox drives a flanged propeller shaft and also provides accessory drives.The Hamilton Standard 14RF-9 propeller is a flange-mounted, controllable-pitch, dual-acting, full-feathering, reversible, four-blade propeller with composite blades. A surviving passenger later assisted by pulling the axe out of the cockpit through the hole Warmerdam had created and struck the glass from the outside in order to increase the size of the hole and help Warmerdam escape. This aircraft had three previous flights that day with no reported problems. The transfer tube provides the pressurized oil to change pitch and provides the control inputs to port oil to the increase or decrease pitch side of the piston.To change pitch the PCU commands the transfer tube to rotate slightly slower than the propeller in order to increase pitch, and slightly faster in order to decrease pitch.

Atlantic Southeast Airlines, Inc.

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