NOTE: The cure time decreases if you apply more heat to the
____ sealant. Make sure you do not let the temperature near the sealant be more than 140°F (60°C).
 G. Put the airplane to its usual condition
 S 414-012
 (1)  Do the Fan Diffuser And Inlet Housing Installation
 (Ref 21-51-07/401).

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A
747-400 MAINTENANCE MANUAL
 AIRFLOW SENSOR - REMOVAL/INSTALLATION
_____________________________________
 1.  General_______
 A.  This procedure has instructions to remove and install the airflow sensors. One airflow sensor is installed in each pack inlet duct, in the wing gear wheel well.
 TASK 21-51-16-004-001
 2.  Airflow Sensor Removal (Fig. 401)______________________
 A.  References
 (1)  
AMM 32-00-30/201, Landing Gear Door Locks

 (2)  
AIPC 21-51-16 Fig. 10

 (3)  
SSM 21-53-01

 (4)  
WDM 21-53-11

 B.  Access
 (1)  Location Zone
 135 Wing Landing Gear Well, LH
 136 Wing Landing Gear Well, RH

 C.  Prepare for the Removal
 S 864-002
 (1)  Make sure the applicable (1, 2, or 3) PACKS selector, on the overhead panel, P5, is in the OFF position.
 (a)  Put a DO-NOT-OPERATE tag on the selector.
 S 494-017
 WARNING: MAKE SURE THE DOWNLOCKS ARE INSTALLED ON THE MAIN LANDING
_______ GEAR. IF YOU MOVE THE CONTROL LEVER WITHOUT THE DOWNLOCKS INSTALLED, THE LANDING GEAR CAN RETRACT AND CAUSE INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT.
 (2)  
Make sure the downlocks are installed on the main landing gear (AMM 32-00-30/201).

 (3)  
Install the locks for the body and wing gear door.

 S 494-023
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747-400 MAINTENANCE MANUAL
PACK 1 AND 2 AIRFLOW SENSORS FORWARD
SEE A
WHEELWELL BULKHEAD PACK 3 AIRFLOW SENSOR
SEE B
AIR CONDITIONING EQUIPMENT BAY
ELECTRICAL CONNECTOR
ELECTRICAL
CONNECTOR

BOLT (6 LOCATIONS)
BOLT (6 LOCATIONS)
PACK 3 AIRFLOW SENSOR
B
PACK 1 AND 2 AIRFLOW SENSOR
A
Airflow Sensor Installation
Figure 401

H15249
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747-400 MAINTENANCE MANUAL
 D. Remove the Sensor
 S 034-005
 (1) Disconnect the electrical connector from the sensor:
 -DT423 for the pack 1 airflow sensor
 -DT424 for the pack 2 airflow sensor
 -DT425 for the pack 3 airflow sensor
 S 034-006
 (2) Remove the bolts that hold the sensor to the duct.
 S 424-033
 CAUTION:_______DO NOT HOLD THE AIR FLOW SENSOR BY THE BLADES. IF YOU HOLD THE AIRFLOW SENSOR BY THE BLADES, DAMAGE TO THE THE AIRFLOW SENSOR CAN OCCUR. MAKE SURE YOU KEEP THE AIRFLOW SENSOR IN A PROTECTIVE BOX WHEN IT IS NOT IN USE.
 (3) Remove the sensor.
 TASK 21-51-16-404-007
 3.  Airflow Sensor Installation (Fig. 401)___________________________
 A. References
 (1)
AMM 21-00-00/201, Air Conditioning

 (2)
AMM 24-22-00/201, Manual Control

 (3)
AMM 45-10-00/201, Central Maintenance Computer System

 (4)
AIPC 21-51-16 Fig. 10

 (5)
SSM 21-53-01

 (6)
WDM 21-53-11

 B. Access
　
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