T12 Temperature Sensor
Figure 021
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boundary layer. The housing is made to minimize turbulence in the gas stream and also to operate over a limited range of angle of attack.
(2) T25 Sensor
(a) General The T25 sensor is located at 4:30 o'clock upstream of variable bleed (VBV) in fan frame. The sensor measures the air temperature downstream of the booster (or HP compressor inlet). This dual sensor is of the resistor probe type (platinum).
(b) Description
R (Ref. Fig. 022) The T25 sensor is composed of the following elements:
1 One sensitive tube-shaped part (to be dipped in the engine
_ flow path) composed of the following items:
a One elbow to orientate the airflow onto the sensitive
_ elements of the sensor.
b Five holes located on the trailing edge to prevent dust
_ accumulation in the sensor that could cause airflow modification.
c One slot located on the trailing edge to ensure a regular
_ airflow on the sensitive elements of the sensor.
d One tube with holes placed radially in sensor inlet to
_
avoid vortex.
e Two probes. Each probe has one resistor and its
_ corresponding electrical line.
2 One body composed of the following items:
_ a One integral metal box that ensures connection between
_ lines and receptacles.
b One flange with 4 captive bolts and a locating pin for
_ sensor attachment to the engine.
c Two receptacles that ensure interface between sensor and
_ HCJ12R harness for channel B and HCJ11R for channel A.
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T25 Sensor
Figure 022
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(c) Operation The operating principle of the sensor is based on the properties inherent to metals (in this case platinum), being that their resistance varies in relation to temperature. A current generated by the ECU supplied to the probe resistor has its signal modified by the temperature surrounding the probe.
(3) T495 Thermocouple Harness
The T495 thermocouple harness (Ref. 77-20-00).
(4) N1 Speed Sensor
The N1 sensor (Ref. 77-10-00).
(5) N2 Speed Sensor
The N2 sensor (Ref. 77-10-00).
(6) Oil Temperature Sensor
(a) General The oil temperature sensor is installed on the No. 1 and 2 bearing oil return tube and is located at 9 o'clock ahead of fan frame, in front of the engine mount The sensor is a dual type thermocouple (Chromel/Alumel).
(b) Description
R (Ref. Fig. 023) The oil temperature sensor is composed of the following:
- A metal body including: A fixed connector. A shoulder which ensures seating of attachment nut. A cylindrical part provided with a groove which accommodates a seal for sensor tightness. A cylindrical boss in which are inserted the 2 hot junctions of thermocouples.
- A nut to secure sensor on oil tube.
(c) Operation
R (Ref. Fig. 023) Each thermocouple inserted in the sensor generates an electromotive force proportional to the surrounding temperature (oil temperature) of the hot junctions. Both signals (channel A and B) are routed to the ECU through the connector and the HJ13 electrical harness.
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Oil Temperature Sensor
Figure 023
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L. Permanent Magnetic Alternator (control alternator)
(1) General The control alternator is a high speed bearingless device that generates 3-phase electrical power for use by the engine control system. The output is sufficient for ECU needs above 15 percent N2.
R (Ref. Fig. 024) The alternator is located on the left forward side of the accessory gearbox. It consists of a separate interchangeable rotor and a separate interchangeable stator. The rotor contains permanent magnets and is piloted on the accessory shaft which has 3 equally-spaced drive flats. The rotor is retained by a nut. The stator has dual 3-phase windings and is bolted to the accessory pad. Sealing is provided by an O-ring.
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