AD Amdt-39-9773
Unsafe Condition
Failure of the heater combustion tube assembly or combustion air pressure switch can cause an airplane fire or explosion, as evidenced by two occurrences including an explosion that blew off the baggage compartment door and a fire in flight.
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Required Actions
Repetitively test the combustion tube via pressure decay tests and overhaul heaters failing these tests. Additionally, conduct repetitive operational testing of the combustion air pressure switch and replace any failing switches.
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Compliance Time
Before further flight
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Affected Aircraft
JanAero Devices B-Series Combustion Heaters, Models B1500, B2030, B3040, and B4050 installed on aircraft, formerly owned by Janitrol, C&D, FL Aerospace, and Midland-Ross Corporation.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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