C. Install the Sensor
S 214-030
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.
(1) Make sure the blades of the sensor are not bent, broken, or twisted.
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747-400 MAINTENANCE MANUAL
S 434-020
(2)
Put a new gasket on the sensor.
S 424-008
(3)
Put the sensor in its position in the duct.
S 434-021
(4)
Install the bolts and the washers to hold the sensor to the duct.
S 434-009
(5)
Connect the electrical connector to the sensor:
-DT423 for the pack 1 airflow sensor
-DT424 for the pack 2 airflow sensor
-DT425 for the pack 3 airflow sensor
D. Do the Installation Test for the Sensor
S 864-010
(1)
Supply electrical power (AMM 24-22-00/201).
S 864-011
(2)
Push the PACK RST switch, on the P5 panel.
S 864-019
(3)
Remove the DO-NOT-OPERATE tag from the applicable PACKS selector, on the P5 panel.
S 864-012
(4)
Operate the applicable air cooling pack (AMM 21-00-00/201).
S 714-013
(5)
Get access to the ECS EICAS maintenance page (AMM 45-10-00/201).
S 714-018
(6)
Make sure the PACK FLOW is between 1100 CFM (31MM) and 2900 CFM (83CMM).
S 794-024
(7)
Feel for leaks around the sensor.
(a)
Small leaks are permitted.
(b)
You must repair a large leak.
E. Put the airplane to its usual condition
S 094-025
(1)
Remove the locks from the body and wing gear doors.
S 864-014
(2)
Do the procedure to stop the applicable air cooling pack
(AMM 21-00-00/201).
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S 864-016
(3) Remove the electrical power, if it is not necessary (AMM 24-22-00/201).
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AIRFLOW SIGNAL CONDITIONER - REMOVAL/INSTALLATION
_________________________________________________
1. General_______
A. This procedure has instructions to remove and install the airflow signal conditioner. The signal conditioner is installed in the right wing gear wheel well.
TASK 21-51-17-004-001
2. Airflow Signal Conditioner Removal (Fig. 401)__________________________________
A. References
(1)
32-00-30/201, Landing Gear Door Locks
(2)
IPC 21-53-51 Fig. 2
(3)
SSM 21-53-01
(4)
WDM 21-53-11
B. Access
(1) Location Zone
136 Wing Landing Gear Well, RH
C. Prepare for the Removal
S 864-002
(1) Make sure all the PACKS selectors, on the overhead panel, P5, are in the OFF position.
(a) Put the DO-NOT-OPERATE tags on the selectors.
S 864-003
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