(a) Remove the DO-NOT-OPERATE tag from the BAT switch.
 S 724-025-C00
 (15) Do the leak check for idle power that is shown in the Power Plant Test Reference Table (AMM 71-00-00/501).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 73-21-02
 ALL  ú ú C03 Page 410 ú Jul 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
COMPRESSOR INLET TEMPERATURE SENSOR - INSPECTION/CHECK
______________________________________________________
 1.  General
_______
 A.  This procedure gives the data for the two inspections as follows:
 (1)  
The check for a CIT sensor that has an internal failure.

 (2)  
The external check of the sensor after you remove it from the engine.

 B.  To do the internal inspection of the CIT sensor, it is not necessary to remove the sensor.
 TASK 73-21-02-206-001-C00
 2.  CIT Sensor Inspection
_____________________
 A.  Equipment
 (1)  
Container - 1 gallon (4 liter) capacity,
 suitable for fuel, local purchase

 (2)  
Brush - soft bristle, local purchase

 B.  Consumable Materials
 (1)  Solvent - Stoddard (CP2011) (AMM 70-10-01/201)
 C.  References
 (1)  
AMM 71-11-02/201, Fan Cowl Panel

 (2)  
AMM 73-21-02/401, Compressor Inlet Temperature Sensor

 (3)  
AMM 78-31-00/201, Thrust Reverser System

 D.  Access
 (1)  Location Zones
 502/602 Fan Cowl Panels, Left
 504/604 Thrust Reverser, Left
 506 No. 1 Engine
 606 No. 2 Engine

 E.  Prepare for the CIT Sensor Inspections
 S 036-002-C00
 (1)  Open the left fan cowl panel (AMM 71-11-02/201).
 S 036-003-C00
 WARNING: OBEY THE INSTRUCTIONS IN THE PROCEDURE TO OPEN THE THRUST
_______ REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS WHEN YOU OPEN THE THRUST REVERSERS, INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
 (2)  Open the left thrust reverser (AMM 78-31-00/201).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 73-21-02
 ALL  ú ú C01 Page 601 ú Mar 15/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
F. Check for Internal Failure of the CIT sensor
 S 036-004-C00
 (1)  
Remove the clamps from the bracket that is installed above and aft of the MEC.

 S 866-005-C00

 (2)  
Put the container below the aft end of the MEC.

 S 036-006-C00

 (3)  
Remove the CIT sensor supply (P6) and return (PB) lines from the MEC.

 (a)  Let the fuel drain into the container.
 S 286-008-C00
 WARNING: DO NOT PUT YOUR MOUTH DIRECTLY ON THE CIT SENSOR PORT WHEN YOU
_______ BLOW INTO IT. MAKE SURE THE FUEL DOES NOT GET INTO YOUR FACE OR ON YOUR CLOTHING. INJURIES TO PERSONS CAN OCCUR.
 CAUTION: DO NOT USE A PRESSURE SOURCE THAT IS HIGHER THAN YOUR LUNG
_______ PRESSURE. A HIGHER PRESSURE SOURCE CAN CAUSE DAMAGE TO A GOOD SENSOR.
 (4)  Use the air from your lungs to blow into the sensor return (PB) line (the longest line).
 (a)  Make sure the fuel or air does not come out from the supply (P6) line.
 NOTE: You can use clean plastic or rubber tubing to blow into the
____
 sensor line.

 S 036-010-C00
 (5)  Do these steps to remove the CIT sensor if you can see the fuel or air flow come out from the P6 line (AMM 73-21-02/401):
 (a)  Drain the remaining fuel from the sensor.
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