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Status:Schlussbericht
Datum:Donnerstag 29 März 2007
Zeit:16:16
Flugzeugtyp:Silhouette image of generic MD83 model; specific model in this crash may look slightly different
McDonnell Douglas DC-9-83 (MD-83)
Fluggesellschaft:Allegiant Air
Kennzeichen: N877GA
Werknummer: 53467/2102
Baujahr: 1994
Betriebsstunden:22139
Triebwerk: 2 Pratt & Whitney JT8D-217C
Besatzung:Todesopfer: 0 / Insassen: 5
Fluggäste:Todesopfer: 0 / Insassen: 152
Gesamt:Todesopfer: 0 / Insassen: 157
Sachschaden: schwer beschädigt
Konsequenzen: Repaired
Unfallort:Sanford, FL (   USA)
Flugphase: Landung (LDG)
Betriebsart:Inländischer planmäßiger Passagierflug
Flug von:Portsmouth Regional Airport, OH (PMH/KPMH), USA
Flug nach:Orlando-Central Florida Regional Airport, FL (SFB/KSFB), USA
Flugnummer:758
Unfallbericht:
A McDonnell Douglas DC-9-83 (MD-83), operated by Allegiant Air as flight 758, landed with the nose landing gear (NLG) retracted at the Orlando Sanford International Airport (SFB), Florida. The airplane received substantial damage. One passenger received minor injuries.
The flight originated from Portsmouth, New Hampshire, at 12:55.
The flight crew was in cruise flight when a master caution light illuminated indicating a loss of the right hydraulic system pressure and hydraulic fluid. The crew used the checklist to trouble shoot the system and attempted to manually extend the main and nose landing gear (NLG) using the alternate extension control lever. Both main gear extended and locked into place; however the NLG did not extend. The airplane was landed with the NLG in the retracted position. Initial inspection of the airplane revealed that a B-nut to the check valve on the rudder power hydraulic shut off valve, was separated from the valve resulting in a total loss of right hydraulic quantity and pressure. Examination of the hydraulic tube, including the B-nut and check valve, did not reveal any abnormalities. Examination of the cockpit revealed the landing gear handle was in the stowed position. A placard on the alternate landing gear extension lever stated, "Pull up forcibly Full Stroke." The airplane was placed on jacks and maintenance personnel successfully extended the nose landing gear. The alternate gear extension control system was also inspected and no defects were noted.

Probable Cause:

The flight crew's failure to complete the checklist and adhere to airplane placards. Contributing to the accident was a separation of a B-nut on the rudder power hydraulic shut off valve for undetermined reasons.

Accident investigation:
cover
Investigating agency: NTSB
Status: Investigation completed
Duration: 1 year and 6 months
Accident number: MIA07LA068
Download report: Summary report
Language: English

Informationsquelle:
» NTSB


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This map shows the airport of departure and the intended destination of the flight. The line between the airports does not display the exact flight path.
Distance from Portsmouth Regional Airport, OH to Orlando-Central Florida Regional Airport, FL as the crow flies is 1121 km (701 miles).

This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.
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