NTSB Identification: DEN07FA008.
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Scheduled 14 CFR Delta Air Lines, Inc.
Accident occurred Wednesday, October 11, 2006 in Denver, CO
Probable Cause Approval Date: 04/25/2007
Aircraft: McDonnell Douglas MD-90-30, registration: N906DA
Injuries: 155 Uninjured.

NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.

When the landing gear was extended on final approach, the nose gear UNSAFE light illuminated. A low fly-by was made, and control tower personnel confirmed that the nose gear appeared to be retracted. After consulting with the company's maintenance department, unsuccessful attempts were made to lower the nose gear, and a nose gear-up landing was made. Postaccident examination revealed that the nose landing gear center spray deflector had fractured and rotated, preventing gear extension. The spray deflector is designed to deflect water and other runway material kicked up by the nose wheel away from the rear-mounted engines which could cause flameouts and engine damage. About one-third of the spray deflector was broken off. Laboratory examination of the deflector revealed the fracture was typical of overstress. The nose gear doors were scraped, and the aluminum skin just aft of the nose wheel well was scraped through, exposing 5 longerons and 6 stringers, compromising the pressure vessel.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

A fractured nose gear assembly spray deflector that blocked the nose gear from extending during landing, and resulted in an intentional nose gear up landing.

Full narrative available

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