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Thermocouple Trim Box (Fig. 1)
_____________________
 A.  The T6 trim unit incorporates a number of resistors and jumpers. The APU controller reads the resistance and calculates the appropriate trim. There are 32 trim steps available. The trim unit is mounted on the aft face of the inlet plenum.
Air Temperature Sensors (Fig. 1)
_______________________
 A.  There are three air temperature sensors (T1, T12 and T13) mounted on the APU. The inlet temperature (T1) sensor and thermocouple cold junction assembly is mounted on the intake plenum. The T1 sensor is a three-wire type platinum RTD sensor and is sheathed. The thermocouple cold junctions are mounted alongside the T1 sensor inside the same sheath. The copper wires provide a T6-T2 signal to the APU controller and the thermocouple wires are connected to the T6 busbars. The load compressor inlet temperature (T12) sensor is a two-wire, nickel element RTD type sensor. The T12 sensor is mounted in the bottom of the inlet plenum. The load compressor air delivery temperature (T13) sensor is mounted in the air delivery duct. The T13 sensor is a three-wire platinum RTD sensor. It is used to monitor load compressor discharge temperature to ensure that safe operation levels are not exceeded.
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A
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MAINTENANCE MANUAL

T1 SENSOR SEE A
THERMOCOUPLE TRIM BOX, IDENTIFICATION UNIT FOR THE SERIAL NUMBER, P1 SENSOR
SEE B T1 SENSOR
AIR INLET PLENUM (REF)
FWD
T1 SENSOR A
AIR
INLET
PLENUM
(REF)

P1 SENSOR
THERMOCOUPLE
TRIM BOX

IDENTIFICATION UNIT FOR THE SERIAL NUMBER
FWD
THERMOCOUPLE TRIM BOX, IDENTIFICATION UNIT FOR THE SERIAL NUMBER, P1 SENSOR
B
APU Engine Mounted Controls - Component Location
Figure 1 (Sheet 1)

F58244
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A

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MAINTENANCE MANUAL

CSEE SENSOR N2 SPEED 
A 
A 
N2 SPEED SENSOR  (REF) GEARBOX ACCESSORY 
FWD  (REF) AIR DUCT DIVERTER 
C N2 SPEED SENSOR 
THERMOCOUPLES EXHAUST GAS (6 LOCATIONS) 

A-A

APU Engine Mounted Controls - Component Location
Figure 1 (Sheet 2)

F58245
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MAINTENANCE MANUAL

T13 
SENSOR 
SEE  D  INLET DUCT 
FOR THE 
COOLING FAN  T13 
(REF)  SENSOR 
N1 SPEED 
SENSOR 
SEE  E 
OUTLET DUCT 
FOR THE LOAD 
T12  COMPRESSOR 
SENSOR  (REF) 
SEE  F 
FWD 
T13 SENSOR 
D 
T12 
SENSOR  STARTER 
(REF) 
LOAD 
GEARBOX 
(REF) 
N1 SPEED  FWD 
SENSOR  FWD 
LOAD 
GEARBOX 
(REF) 
N1 SPEED SENSOR  T12 SENSOR 
E  F 

APU Engine Mounted Controls - Component Location
Figure 1 (Sheet 3)

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F59064
A
　
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