AD NUMBER: 2004-21-05 MANUFACTURER: Heaters SUBJECT: Airworthiness Directive 2004-21-05 SUMMARY: The FAA is superseding Airworthiness
Directive (AD) 96-20-07, which applies to certain B-Series
Combustion Heaters Models B1500, B2030, B3040, and B4050 that are
installed on airplanes. AD 96-20-07 currently requires you to
repetitively test (pressure decay) the combustion tube and overhaul
any heater that does not pass any test. AD 96-20-07 also requires
you to repetitively test the operation of the combustion air
pressure switch and replace any combustion pressure switch that
does not pass one of the tests. As a terminating action for the
repetitive test requirements of AD 96-20-07, you could install a
new ceramic-coated combustion tube and an improved design
combustion air pressure switch. This AD is the result of reports
that the new ceramic-coated combustion tubes are subject to the
same distress as the non-ceramic coated combustion tubes.
Consequently, this AD retains the repetitive testing requirements
of AD 96-20-07, removes the terminating action for the combustion
tube, and adds Models B2500, B3500, and B4500 to the applicability
section. We are issuing this AD to prevent combustion by-products
(carbon-monoxide exhaust) and fuel leakage from the combustion
heaters caused by failure of the combustion heater system. This
failure could result in fire or explosion in the airplane and
possible carbon monoxide poisoning of the crew and passengers in
the cabin.
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