Teledyne Continental Motors, Inc.
TM
Engine
Description
IOF-550 Permold Series Engine Maintenance Manual
2-21
1 April 2007
top of the engine. The Engine Low Voltage Harness uses removable, circular connectors
to interface with the MAP Sensors.
2-2.5.10. Manifold Air Temperature Sensor
The FADEC System utilizes two MAT Sensors for measuring intake manifold air
temperature using a thermistor, similar to the CHT Sensor. The sensors are mounted in
the intake plenum using compression fittings. The fitting body threads into bosses on the
intake plenum manifold. The sensors are report intake air temperature to the ECU
through hardwired connections to the Engine Low Voltage Harness.
2-2.5.11. Fuel Pressure Sensors
The FADEC System utilizes two sensors for measuring available engine fuel pressure.
The sensors are self-contained, non-serviceable units, thread-mounted into the fuel
distribution block on top of the engine. The fuel pressure sensors report fuel pressure to
the ECU through removable circular connectors on the Engine Low Voltage harness.
2-2.5.12. Engine Control Indication Options
Multiple indication options are available for crew compartment displays, ranging from
simple lamp driver circuits to multiple line LCD control panels.
2-2.5.12.1. Health Status Annunciator
The two-lamp HSA panel has a red FADEC warning lamp (Figure 2-13) and a yellow
FADEC caution lamp. The warning lamp will illuminate if a malfunction exists with any
combination of non-opposing cylinder pairs. The caution lamp will illuminate if a
malfunction exists with any combination of opposing cylinder pairs. A FADEC caution
will always precede a FADEC warning condition.
FADEC
WARN
FADEC
CAUTION
FADEC
WARN
FADEC
CAUTION
Figure 2-13.
Two-Lamp HSA Panel
The HSA with battery condition monitor panel has a red FADEC Warning lamp (Figure
2-14) and a yellow FADEC Caution lamp.
EBAT
FAIL
FUEL
PUMP
PPWR
FAIL
FADEC
CAUTION
FADEC
WARN
EBAT
FAIL
FUEL
PUMP
PPWR
FAIL
FADEC
CAUTION
FADEC
WARN
Figure 2-14.
HSA with Battery Condition Monitor Panel
Functionality of the HSA with Battery Condition Monitor Panel is the same as the two-
lamp HSA with three additional lamps. The PPWR and EBAT FAIL are power condition
monitors; the fuel pump lamp illuminates when the ECU detects fuel pressure is below an
expected level and commands the aircraft boost pump to increase pressure to compensate.