Accident McDonnell Douglas DC-9-83 (MD-83) N877GA,
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Date:Thursday 29 March 2007
Type:Silhouette image of generic MD83 model; specific model in this crash may look slightly different    
McDonnell Douglas DC-9-83 (MD-83)
Owner/operator:Allegiant Air
Registration: N877GA
MSN: 53467/2102
Year of manufacture:1994
Total airframe hrs:22139 hours
Engine model:Pratt & Whitney JT8D-217C
Fatalities:Fatalities: 0 / Occupants: 157
Aircraft damage: Substantial, repaired
Location:Sanford, FL -   United States of America
Phase: Landing
Nature:Passenger - Scheduled
Departure airport:Portsmouth Regional Airport, OH (PMH/KPMH)
Destination airport:Orlando-Central Florida Regional Airport, FL (SFB/KSFB)
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
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.

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
Report number: MIA07LA068
Status: Investigation completed
Duration: 1 year and 6 months
Download report: Final report



Revision history:


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