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Statuts:Enquête Officielle
Date:jeudi 29 mars 2007
Type/Sous-type:Silhouette image of generic MD83 model; specific model in this crash may look slightly different
McDonnell Douglas DC-9-83 (MD-83)
Compagnie:Allegiant Air
Immatriculation: N877GA
Numéro de série: 53467/2102
Année de Fabrication: 1994
Heures de vol:22139
Moteurs: 2 Pratt & Whitney JT8D-217C
Equipage:victimes: 0 / à bord: 5
Passagers:victimes: 0 / à bord: 152
Total:victimes: 0 / à bord: 157
Dégats de l'appareil: Substantiels
Conséquences: Repaired
Lieu de l'accident:Sanford, FL (   Etats-Unis d'Amérique)
Phase de vol: A l'atterrissage (LDG)
Nature:Transport de Passagers Nat.
Aéroport de départ:Portsmouth Regional Airport, OH (PMH/KPMH), Etats-Unis d'Amérique
Aéroport de destination:Orlando-Central Florida Regional Airport, FL (SFB/KSFB), Etats-Unis d'Amérique
Numéro de vol:758
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:
Investigating agency: NTSB
Status: Investigation completed
Duration: 1 year and 6 months
Accident number: MIA07LA068
Download report: Summary report
Language: English



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Ce plan montre l'aéroport de départ ainsi que la supposée destination du vol. La ligne fixe reliant les deux aéroports n'est pas le plan de vol exact.
La distance entre Portsmouth Regional Airport, OH et Orlando-Central Florida Regional Airport, FL est de 1121 km (701 miles).

Les informations ci-dessus ne représentent pas l'opinion de la 'Flight Safety Foundation' ou de 'Aviation Safety Network' sur les causes de l'accident. Ces informations prélimimaires sont basées sur les faits tel qu'ils sont connus à ce jour.
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