NTSB issues safety recommendations following Beech 1900 nosegear fatigue incidents

Published on : Saturday, February 16, 2013

NTSB logoSeveral recent incidents involving nose landing gear (NLG) cracks and leaks
on Beechcraft 1900D airplanes prompted the NTSB to issue three safety
recommendations.

On May 17, 2011, a Beechcraft 1900D, N218YV, sustained minor damage when
the left main landing gear (MLG) collapsed during the landing roll on runway 35L
at Denver International Airport (DEN), Denver, Colorado. There were no injuries.

The NTSB determined that the probable cause of the incident was the fatigue
failure of the NLG end cap, which resulted in insufficient hydraulic pressure to
secure the left MLG into the down-and-locked position.

During the investigation, the NTSB learned of five previous NLG end cap failures.
Although the maintenance manual was changed, two additional instances of fatigue
cracks of NLG end caps on Beechcraft 1900D airplanes had occurred.

The NTSB concludes that the repetitive inspections using the current Hawker
Beechcraft-developed and -approved method are not capable of detecting
subcritical fatigue cracks in the NLG end caps. Without an effective inspection
method, the 1,200-cycle inspection interval is not adequate to ensure that cracks
are detected before failure occurs in service. Therefore, the NTSB recommends
that Hawker Beechcraft Corporation revise the Beechcraft 1900D NLG end cap
repetitive inspection procedure and time interval to ensure that fatigue cracks are
detected prior to failure and issue updated guidance to operators regarding the
inspections.

Therefore, the National Transportation Safety Board makes the following
recommendations to Hawker Beechcraft Corporation:

• Determine the fatigue life (life limit) of the Beechcraft 1900D nose landing
gear (NLG) end cap with the longitudinal grain direction both aligned and
not aligned with the longitudinal axis of the NLG. (A-13-04)

• Develop and implement a replacement program for all Beechcraft 1900D
nose landing gear end caps based on the fatigue life determined in Safety
Recommendation A-13-04. (A-13-05)

• Revise the Beechcraft 1900D nose landing gear end cap repetitive inspection
procedure and time interval to ensure that fatigue cracks are detected prior
to failure and issue updated guidance to operators regarding the inspections.
(A-13-06)

Source: Aviation Safety Network

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