Incident Overview
During a departure, the flight crew observed a nose gear disagreement light after retracting the landing gear. The flight proceeded to Anchorage, where the crew attempted to lower the nose gear using both normal and manual extension methods, but were unsuccessful.
Landing and Examination
The aircraft landed with the main landing gear extended and the nose gear retracted. Subsequent examination of the nose gear mechanisms identified that the two links responsible for exercising the pawl block locks had failed. This failure allowed the nose gear to remain in the fully retracted and locked position.
Findings
The investigation determined that the failed links prevented the nose gear from extending. The specific design and operational details of the links and pawl block locks were not disclosed in the available information.
Conclusion
The incident concluded with the aircraft safely on the ground, and the cause of the malfunction was traced to the structural failure of the two links in the nose gear locking mechanism.