AD NUMBER: 2007-12-21
MANUFACTURER: Hawker Beechcraft Corporation
SUBJECT: Airworthiness Directive 2007-12-21 SUMMARY: The FAA is
adopting a new airworthiness directive (AD) to supersede AD
2006-26-08, which applies to all Hawker Beechcraft Corporation
(HBC) Model 390 airplanes. AD 2006-26-08 currently requires you to
repetitively inspect the hydraulic pump outlet tube on both engines
and immediately replace the tube if damage is found. AD 2006-26-08
also requires you to incorporate an airplane flight manual (AFM)
change that limits operation of an engine with its associated
firewall hydraulic shutoff valve closed. If an engine is operated
with its firewall hydraulic shutoff valve closed, you must replace
the hydraulic pump outlet tube. We issued AD 2006-26-08 as an
interim action while we worked with the type certificate holder to
develop a design change. HBC has now developed kits that
incorporate design changes for the hydraulic pump outlet tubes and
dampener supports so this AD retains the actions of AD 2006-26-08
until the new modification kits required by this AD are installed.
We continued to receive additional reports of failures of the
hydraulic pump outlet tube. We are issuing this AD to prevent
failure of the hydraulic pump outlet tube and consequent leaking of
hydraulic fluid. Such leakage could result in a fire. There is also
arisk of loss of hydraulic system functions including normal gear
extensions, speed brakes, roll spoilers, lift dump, and normal
brakes.
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