Fri, Jan 20, 2006
Inspection Of Hydraulic Tube Assembly Necessary
Editor's Note: The FAA has issued an
Emergency AD for the Premier 1 business jet, after the agency
received reports of four failures of a hydraulic tube assembly on
the aircraft's left engine. Each failure resulted in an
in-flight loss of hydraulic fluid.
Below is an edited summary of the FAA's
statements on the AD. ANN strongly encourages our readers affected
by this AD to take the time to read the entire document, accessed
via the FMI link at the bottom of this story.
The FAA received reports of four failures of the part number
(P/N) 390-580035-0001 hydraulic tube assembly located on the left
engine assembly of Raytheon Model 390 airplanes. The failures
resulted in in-flight loss of hydraulic fluid. The tube is
installed between the hydraulic pump and the hydraulic pulsation
damper and carries hydraulic pump output pressure.
The latest failure
occurred on an airplane with 83 hours time-in-service on the
hydraulic tube assembly. Failure of the hydraulic tube assembly and
consequent leaking of hydraulic fluid could result in loss of
hydraulic system functions and risk of fire because of flammable
fluid leakage in the engine nacelle. This failure could lead to
loss of control of the airplane.
We have evaluated all information related to this subject and
identified an unsafe condition that is likely to exist or develop
on other Raytheon Aircraft Company 390 airplanes of the same type
design. Therefore, we are issuing this AD to prevent failure of the
hydraulic tube assembly and consequent leaking of hydraulic fluid.
This failure could result in loss of hydraulic system functions and
risk of fire because of flammable fluid leakage in the engine
nacelle and lead to loss of control of the airplane.
This AD requires operators to:
- inspect the hydraulic tube assembly (P/N 390-580035-0001 or P/N
390-580035-0005) and the clamp (P/N MS21919WCJ6 or P/N MS21919WCJ7)
(or FAA-approved equivalent part numbers), as specified in the
service information.;
- replace the clamp at each inspection;
- replace the hydraulic tube assembly immediately if any of the
problems identified in the service bulletin are found; and
- report the results of each inspection or replacement to the
FAA.
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