(2)
One in the flight deck.

 (3)
One in the upper deck.

 (4)
One in the crew rest area.

 B.  Each sensor assembly has these items:
 (1)
A single phase 115-volt ac motor driven blower.

 (2)
A temperature sensor.

 (3)
A temperature bulb in a housing.

 C.  You must do a test of the sensor after you install it.
 TASK 21-61-03-004-001
 2.  Zone Temperature Sensor Assembly Removal (Fig. 401)
________________________________________
 A.  References
 (1)
AIPC 21-61-03, Fig. 4

 (2)
AIPC 21-61-03, Fig. 10

 (3)
AMM 25-22-03/401, Upper Deck Ceiling Panels

 (4)
AMM 25-59-01/401, Main Deck Cargo Lining Panels

 (5)
WDM 21-61-11, WDM 21-61-21, WDM 21-61-35, WDM 21-61-45

 (6)
SSM 21-61-01, SSM 21-61-02, SSM 21-61-15, SSM 21-61-16

 B.  Access
 (1)  Location Zones 220 Control Compartment and Upper Deck Compartment Body Sta 240 to 632 230 Main Deck Compartment Body Sta 488 to 854 and Area Aft of Crew Rest 240 Main Deck Body Sta 854 to 1319 and Upper Area Above Ceiling Body Sta 860 to 1319 250 Main Deck Body Sta 1319 to 1720 and Upper Area above ceiling Body Sta 1319 to 1720
 260  Main Deck Body Sta 1720 to 2040 and Upper Area Above ceiling Body Sta 1720 to 2040
 C.  Prepare for the Removal
 S 864-005
 (1) Open these circuit breakers and attach DO-NOT-CLOSE identifiers:
 (a) Main Power Distribution Panel, P6:
 1)  For all the zone temperature sensors: a) 6F28, ZONE TEMP CONT AC b) 6F29, ZONE TEMP CONT DC
 2)  For the applicable zone temperature sensor: a) 6G28, ZONE TEMP SENSOR FLT DK b) 6G29, ZONE TEMP SENSOR UPR DK & CREW REST
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 21-61-03
 ALL  ú ú 01F Page 401 ú Feb 15/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400
MAINTENANCE MANUAL

FLIGHT DECK  UPPER DECK 
TEMPERATURE SENSOR  TEMPERATURE SENSOR  AFT MAIN DECK 1 
SEE  A  SEE  B  TEMPERATURE SENSOR 
SEE  D 

AFT MAIN DECK 2 TEMPERATURE SENSOR
FORWARD MAIN DECK 1 TEMPERATURE SENSOR SEE D
FORWARD MAIN DECK 2
TEMPERATURE SENSOR

SEE D
SEE D
CREW REST AREA
TEMPERATURE SENSOR

SEE C  TEMPERATURE
ZONE BULB CONNECTOR
TEMPERATURE
SENSOR ASSEMBLY

TEMPERATURE
SENSOR
CONNECTOR
NUT WASHER SPONGE RUBBER WASHER
STUD
GASKET PLATE
FILTER COVERPANEL FAN MOTOR FILTER
CONNECTOR FWD
A
SCREW, NUT, WASHER
(3 LOCATIONS)
GASKET FAN MOTOR CONNECTOR
TEMPERATURE SENSOR CONNECTOR
ZONE TEMPERATURE SENSOR ASSEMBLY
TEMPERATURE CREW REST AREA BULB CONNECTOR CEILING PANEL
B
Zone Temperature Sensor Assembly Installation
Figure 401 (Sheet 1)

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 21-61-03
 ALL  ú ú 01F Page 402 ú Oct 10/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
C78977
A
747-400
MAINTENANCE MANUAL

GASKET
FAN MOTOR 
CONNECTOR 
TEMPERATURE SENSOR 
CONNECTOR 
SCREW, NUT, WASHER 
(3 LOCATIONS) 
UPPER DECK 
CEILING PANEL 
ZONE TEMPERATURE 
SENSOR ASSEMBLY 
TEMPERATURE BULB 
CONNECTOR 

C

ZONE TEMPERATURE  TEMPERATURE 
SENSOR ASSEMBLY  BULB CONNECTOR 
TEMPERATURE 
SENSOR CONNECTOR 

MAIN DECK CARGOSCREW, WASHER COMPARTMENT CEILING
(10 LOCATIONS) FAN MOTOR
BOLT, WASHER, NUT
CONNECTOR

(3 LOCATIONS) GASKET
COVERPLATE D Zone Temperature Sensor Assembly Installation Figure 401 (Sheet 2)
 C79093
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