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Oil temperature and pressure
35. It is essential for correct and safe operation of the engine that accurate indication is obtained of both the temperature and pressure of the oil. Temperature and pressure transmitters and indicators are illustrated in fig 12-9.
36. Oil temperature is sensed by a
temperature- sensitive element fitted in the oil system. A change
in temperature causes a change in the resistance value and,
consequently, a corresponding change in the current flow at the
indicator. The indicator pointer is deflected by an amount
equivalent to the temperature change and this is recorded on
the gauge in degrees centigrade.
37. Oil pressure is electrically transmitted to an indicator on the instrument panel. Some installations use a flag-type indicator, which indicates if the pressure is high, normal or low; others use a dial- type gauge calibrated in pounds per square inch (p.s.i.).
38. Electrical operation of each type is similar; oil pressure, acting on the transmitter, causes a change in the electric current supplied to the indicator. The amount of change is proportional to the pressure applied at the transmitter.
39. The transmitter may be of either the direct or the differential pressure type. The latter senses the pressure difference between engine feed and return oil pressures, the return oil being pressurized by cooling and sealing air (Part 9) from the bearings.
40. In addition to a pressure gauge operated by a transmitter, an oil low pressure warning switch may be provided to indicate that a minimum pressure is available for continued safe running of the engine. The switch is connected to a warning lamp in the flight compartment and the lamp illuminates if the pressure falls below an acceptable minimum.
Oil temperature and pressure
35. It is essential for correct and safe operation of the engine that accurate indication is obtained of both the temperature and pressure of the oil. Temperature and pressure transmitters and indicators are illustrated in fig 12-9.
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| Fig. 12-9 Oil temperature and pressure transmitters and indicators. |
37. Oil pressure is electrically transmitted to an indicator on the instrument panel. Some installations use a flag-type indicator, which indicates if the pressure is high, normal or low; others use a dial- type gauge calibrated in pounds per square inch (p.s.i.).
38. Electrical operation of each type is similar; oil pressure, acting on the transmitter, causes a change in the electric current supplied to the indicator. The amount of change is proportional to the pressure applied at the transmitter.
39. The transmitter may be of either the direct or the differential pressure type. The latter senses the pressure difference between engine feed and return oil pressures, the return oil being pressurized by cooling and sealing air (Part 9) from the bearings.
40. In addition to a pressure gauge operated by a transmitter, an oil low pressure warning switch may be provided to indicate that a minimum pressure is available for continued safe running of the engine. The switch is connected to a warning lamp in the flight compartment and the lamp illuminates if the pressure falls below an acceptable minimum.
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