The engine AFES is designed to activate automatically when the thermal
detection system detects an engine fire.
To perform this function, the
engine AFES has an arrangement of sensing devices (fire wire) located
throughout the engine compartment, status lights, switches, electronic
circuitry, and TEST/ALARM (T/A) panels. A description and illustration of
the engine AFES components are provided below.
Engine Test and Alarm Panel.
The engine test and alarm panel
provides status lights and switches and the necessary circuitry to
automatically monitor the engine AFES.
The engine AFES T/A panel
(Figure 3) is located in the driver's compartment and monitors the
thermal sensing elements (fire wires) (Figure 4) mounted throughout
the engine compartment.
Should fire occur in the engine
compartment, the sensing element sends a signal to the T/A panel and
one of the two engine fire extinguishers is automatically activated.
The red FIRE ALARM indicator on the T/A panel in the drivers
compartment and the red ENGINE FIRE indicator on the remote status
indicator (RSI) (Figure 4), located in the crew compartment, will
driver and crew.
Built-in test equipment (BITE) is incorporated
into the engine AFES and automatically monitors the status of AFES
components and allows for a test to determine the status of AFES
components for normal operation.
A two-position MANUAL DISCHARGE
toggle switch, covered by a red guard, is mounted on the engine T/A
panel. This switch permits manual discharge of the AUTO engine fire
Thermal Detection System (see Figure 4).
This component of the
engine AFES is made up of fire sensing elements and couplings
located throughout the engine compartment.
The fire sensing
elements will detect engine overheat conditions and fires. When an
engine overheat condition exists, the engine T/A panel FIRE ALARM
and the RSI lamps will flash to warn both driver and crew of the
Remote Status Indicator. The remote status indicator is a red light
that warns personnel in the crew compartment of an engine fire or
The RSI ENGINE FIRE warning and the red FIRE
ALARM lamp on the engine T/A panel operate in unison to warn of
engine fire or overheat condition (see Figure 5).