AD NUMBER: 2006-26-08
MANUFACTURER: Raytheon
SUBJECT: Airworthiness Directive 2006-26-08 SUMMARY: The FAA is
adopting a new airworthiness directive (AD) to supersede AD
2006-02-51, which applies to certain Raytheon Aircraft Company
Model 390 airplanes. AD 2006-02-51 currently requires you to
inspect the left engine hydraulic pump outlet tube and the clamp;
replace the clamp at each inspection; replace the hydraulic pump
outlet tube immediately if any problem is found; and report the
results of each inspection or replacement to the FAA. This AD is
the result of several hydraulic pump outlet tube failures after
issuance of AD 2006-02-51, including failures on the right engine.
This AD requires you to visually inspect the hydraulic pump outlet
tube on both engines on a recurring basis and immediately replace
the tube if damage is found. This AD also requires incorporation of
an Airplane Flight Manual (AFM) change to not allow operation of an
engine with its associated firewall hydraulic shutoff valve closed.
In addition, this AD requires you to replace the hydraulic pump
outlet tube if an engine is operated with its firewall hydraulic
shutoff valve closed. 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 a risk of
loss of hydraulic system functions including normal gear
extensions, speed brakes, roll spoilers, lift dump, and normal
brakes.
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