MANUFACTURER: Learjet Inc. Model 45
Airplanes SUBJECT: Airworthiness Directive 2011-13-10
SUMMARY: The FAA Is superseding an existing
airworthiness directive (AD) for the products listed above. That AD
currently requires, for certain airplanes, repetitive inspections
for chafing and other damage of the case drain tube from the
hydraulic pump case installed on the left-hand engine, and
corrective action if necessary. That AD also requires, for all
airplanes, repetitive inspections for discrepancies of the left
engine's nacelle tubing, repetitive inspections for evidence of
fluid leakage within the left engine accessory compartment, and
corrective actions if necessary.
This new AD also requires replacing the left engine fuel and
hydraulic tubing and installing a tubing support channel, which
terminates the repetitive inspections required in the existing AD.
This new AD also removes airplanes from the applicability. This AD
was prompted by reports of chafed hydraulic tubes in the left-hand
engine. The FAA Is issuing this AD to prevent chafed hydraulic
tubes in the left-hand engine and consequent hydraulic tube failure
and uncontrolled loss of flammable fluid within the engine cowling,
which could result in a fire in the engine nacelle and loss of
control of the airplane.