JS-MD 3 RES
Flight Manual Supplement
MD11-AFM-00-002
Issue: 02
Rev. 00
Rev. Date: 24-Mar-23
Page 8
–5
Fire Warning System
The independent system is powered by a 9 V battery in a dedicated
compartment, located at the right side of the binnacle below the
instrument panel. The battery must be replaced every two years (as
part of the documented maintenance) or any time it fails a pre-flight test
- whichever occurs sooner.
The red LED on the panel illuminates and the audible buzzer activates
by one of three methods:
•
Closing the circuit by pressing the TEST momentary push
button located next to the LED on the instrument panel
•
Closing of the temperature switch(es) in the motor
compartment by exposure to heat
•
Closing the circuit via one (or both) of the heat trace cables in
the motor compartment being exposed to enough heat to melt
the separation material within the cable core and allowing the
internal conductor wires to make contact
NOTE:
LED and buzzer activation via the temperature switches
is reversible
– once the switch cools the circuit will simply
re-open and the LED will turn off. During annual
inspection, the function of each switch must be tested via
local warming of each switch using a hair-dryer (or heat
gun on a low setting).
NOTE:
LED and buzzer activation via the heat trace cable(s) is
permanent. Do not apply artificial heat to the cables.
Only the cable connections should be inspected during
annual maintenance. If unintentionally heated, they must
be replaced.
NOTE:
The fire warning system audible buzzer can be silenced
via the dedicated circuit breaker or via removal of the 9 V
battery from its compartment.
