AD NUMBER: 2006-10-15
SUBJECT: Airworthiness Directive 2006-10-15 SUMMARY: The FAA is
adopting a new airworthiness directive (AD) for certain Learjet
Model 45 airplanes. This AD requires a review of airplane
maintenance records to determine whether inspections identified by
certain inspection reference numbers (IRNs) have been done. If any
IRN has not been done, this AD requires doing an inspection of the
inside of the wet wing fuel areas and the fuel pump screens for
tape and adhesive tape residue, cleaning the low pressure fuel
filter,determining whether tape or adhesive residue is present,
doing an inspection of the filter for damage before installation,
and applicable corrective actions if necessary. In addition, this
AD requires sending the review and inspection results to the FAA.
This AD results from reports of tape found in the wing fuel tanks.
We are issuing this AD to prevent blocked fuel passages and fuel
pump screens and the inability of the flight crew to transfer fuel
from one wing tank to the other tank due to tape in the wing fuel
tanks, which could result in a fuel imbalance and consequent
failure of an engine; and to prevent contaminated fuel pump
screens, engine fuel controls, and fuel nozzles, due to tape
adhesive dissolving in the fuel, which could result in potential
erroneous readings of the fuel quantity indication system.