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 (4)  S 864-013Remove the DO-NOT-CLOSE tags and close these circuit breakers: (a) P6, Main Power Distribution Panel 1) 6G33, ZONE TEMP SENSOR LWR CARGO 2) 6F28, ZONE TEMP CONT AC 3) 6F29, ZONE TEMP CONT DC 4) 6F35, PACK TEMP CONT A 5) 6F36, PACK TEMP CONT B (b) P415, Power Distribution Center - Right 1) 415K27, PACK TEMP CONT A 2) 415C38, PACK TEMP CONT B
 (5)  S 864-016Supply electrical power (Ref. 24-22-00/201).
 (6)  S 864-017Supply power to the CMCS.
 (7)  S 714-022Set the menu to the existing faults page for chapter 21 - air conditioning (AMM 45-10-00/201).
 (8)  S 714-018Do a test of the sensor. (a) Push the ZONE RST switch on the P5 overhead panel.

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747-400 MAINTENANCE MANUAL
 (b)  
Push the PACK RST switch on the P5 overhead panel.

 (c)  
Make sure that no messages for the cargo temperature sensors show on the CMC Existing Faults Page.

 (d)  
Make sure that the sensor fan operates.

 S 434-019
 (9)  
Put the coverplate on the sensor assembly.

 S 434-023

 (10)
 Attach the coverplate with the ten screws and washers.

 S 864-020

 (11)
 Remove the electrical power if it is not neccessary (Ref. 24-22-00/201).

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747-400 MAINTENANCE MANUAL
 CARGO COMPARTMENT TEMPERATURE SENSOR ASSEMBLY - CLEANING
________________________________________________________
 1.  General_______
 A.  This subject contains instructions to clean the cargo compartment temperature sensors.
 TASK 21-61-05-107-001
 2.  Cargo Compartment Temperature Sensor Cleaning_____________________________________________
 A.  Standard Tools and Equipment
 (1)  
Cloth - Dry, Lint-Free

 (2)  
Brush - Soft Bristles

 B.  Consumable Materials
 (1)  Use one of these cleaning solutions:
 (a)  
B00039 - Brulin Formula 815 MX (dilute 8 to 1 with water)

 (b)  
B00043 - NRG Plus No. 678 (dilute with water as it is necessary)

 (c)  
B00130 - Isopropyl Alcohol

 C.  References
 (1)  
20-11-28/401, Lockwire

 (2)  
21-61-05/401, Cargo Comartment Temperature Sensor Assembly

 D.  Access
 (1)  Location Zone 121 Forward Cargo Comartment Forward Half, LH 142 Aft Cargo Compartment, RH 145 Bulk Cargo Compartment, LH
 E.  Disassemble the Temperature Sensor Assembly
 S 027-002
 (1)
Remove the temperature sensor assembly (Ref 21-61-05/401).

 S 037-003

 (2)  
Remove the two screws from the temperature sensor flange and remove the temperature sensor from the housing.

 (3)  
Remove the temperature bulb from the housing.

 S 037-004

 (4)  
Remove the sensor fan to get access to the housing internals as follows:

 (a)  
Make a note of the position of the electrical terminal block on the fan in relation to the housing.

 (b)  
Loosen the three screws from the sensor fan clamps until the clamps can be turned.

 (c)  
Hold the fan so that it does not fall and turn the clamps until they are free of the sensor fan flange.

 

 S 037-012
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