AD NUMBER: 2006-09-13
MANUFACTURER: Honeywell
SUBJECT: Airworthiness Directive 2006-09-13 SUMMARY: The FAA is
superseding an existing airworthiness directive (AD) for Honeywell
International Inc. ALF502L series and ALF502R series turbofan
engines. That AD currently establishes stress rupture retirement
life limits for certain third stage turbine discs used in
conjunction with certain third stage turbine nozzles. This AD
brings requirements forward and unchanged, from the previous AD for
ALF502R series turbofan engines. Also, this AD establishes new
reduced stress rupture retirement life limits for certain part
numbers (P/Ns) of third stage turbine disc and shaft assemblies
installed in ALF502L series turbofan engines. This AD also requires
removing those same parts from service using a drawdown schedule.
This AD results from a report of failure of a third stage turbine
disc and shaft assembly, leading to turbine blade release and
separation of the exhaust nozzle. We are issuing this AD to prevent
total loss of engine power, in-flight engine shutdown, release of
turbine blades, separation of the exhaust nozzle, and possible
damage to the airplane.The FAA is superseding an existing
airworthiness directive (AD) for Honeywell International
Inc.ALF502L series and ALF502R series turbofan engines. That AD
currently establishes stress rupture retirement life limits for
certain third stage turbine discs used in conjunction with certain
third stage turbine nozzles. This AD brings requirements forward
and unchanged, from the previous AD for ALF502R series turbofan
engines. Also, this AD establishes new reduced stress rupture
retirement life limits for certain part numbers (P/Ns) of third
stage turbine disc and shaft assemblies installed in ALF502L series
turbofan engines. This AD also requires removing those same parts
from service using a drawdown schedule. This AD results from a
report of failure of a third stage turbine disc and shaft assembly,
leading to turbine blade release and separation of the exhaust
nozzle. We are issuing this AD to prevent total loss of engine
power, in-flight engine shutdown, release of turbine blades,
separation of the exhaust nozzle, and possible damage to the
airplane.
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