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A
747-400 MAINTENANCE MANUAL
 G.  Probe Heat System Ground Test
 S 745-088
 (1)  Push the LSK that is adjacent to the applicable prompt (<PROBE HEAT L or <PROBE HEAT R).
 NOTE: IN PROGRESS will show during the test.
____
 S 745-089
 (2)  When IN PROGRESS goes out of view, look for PASS or FAIL> adjacent to the applicable prompt (<PROBE HEAT L or <PROBE HEAT R).
 NOTE: If a PASS indication shows, no failures occurred during the
____ test. Make sure there is continuity through the diode for the left and right of the pitot and AUX probe heat.
 (a)  If PASS> shows, do these steps to check for continuity through the diode:
 1)  Make sure that these circuit breakers on the P6, Main Power Distribution Panel are closed: a) 6D30, PROBE HEAT PITOT L b) 6D31, PROBE HEAT PITOT R c) 6D32, PROBE HEAT AUX PITOT L d) 6D33, PROBE HEAT AUX PITOT R e) 6D34, PROBE HEAT IND L f) 6D35, PROBE HEAT IND R
 2)  On the YMLA001 ENG 1 N2 speed card in the forward electrical system card file , set the S1 switch to (hold the S2 switch in) the TEST position.
 3) Measure the voltage at Pin C1 and Pin B1 of the left (right) Relay socket DR7425 (DR7426). 4) Make sure the voltage measurement is from 55 to 65 volts, with a digital multimeter on the AC scale.
 5)  If the voltage measurement is not from 55 to 65 volts, replace the appropriate Diode Assembly (M3412 (M3415) for left (right) PITOT probe heat and M3413 (M3416) for left (right) AUX PITOT probe heat).
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747-400
MAINTENANCE MANUAL

 (b)  If FAIL> shows, look for probe heat system CMCS messages: 1) Push the LSK that is adjacent to FAIL> to see the GROUND TEST MSG pages for the failure. 2) Push the NEXT PAGE key until you find all the GROUND TEST MSG pages. 3) Make a list of all CMCS messages, CMCS message numbers, and ATA numbers that show on the GROUND TEST MSG pages.
 4)  Go to the CMCS Message Index of the Fault Isolation Manual (FIM) to find the corrective action for each CMCS message.
 H.  Put the Airplane in Its Usual Condition
 S 865-090
 (1)  
Set the GND TEST switch to NORM.

 S 865-091

 (2)  
Remove electrical power (AMM 24-22-00/201).

 TASK 30-31-00-735-015
 4.  System Test - Pitot-Static/TAT/AOA Anti-Ice System
__________________________________________________
 A.  Equipment
 (1)  Digital Multimeter, Fluke Model 77 or equivalent
 NOTE: This is used for alternative voltage measurements when you do
____ a check of the probe heater operation.
 B.  References
 (1)  
AMM 24-22-00/201 Manual Control

 (2)  
AMM 31-61-00/201, Integrated Display System

 (3)  
AMM 32-09-02/201, Air/Ground Relay System

 (4)  
SSM 30-31-01, SSM 30-32-01, SSM 30-33-01

 (5)  
WDM 30-31-11, WDM 30-31-21, WDM 30-31-32

 C.  Access
 (1)  Location Zone 221 Control Cabin, LH 222 Control Cabin, RH 211 Passenger Cabin, Nose to First Door - Upper Left P/S
 Probe and Left TAT Probe 212 Passenger Cabin, Nose to First Door - Upper Right P/S Probe and Right TAT Probe 115 Area between Nose Gear Well and Fuselage - Lower Left P/S Probe and Left AOA Sensor Vane 116 Area between Nose Gear Well and Fuselage - Lower Right P/S Probe and Right AOA Sensor Vane 117 Electrical and Electronics Compartment - P414 Main Power Distribution Panel 118 Electrical and Electronics Compartment - P415 Main Power Distribution Panel
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747-400 MAINTENANCE MANUAL
 D. Preconditions
 S 865-099
 (1)  These conditions are necessary for this task:
 (a)  
Electrical power on (AMM 24-22-00/201).

 (b)  
Integrated Display System (IDS) is serviceable (AMM 31-61-00/501).
　
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