S 865-092
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747-400 MAINTENANCE MANUAL
 S 715-102
 (17)
 Pressurize hydraulic system No. 1 and 4 (AMM 29-11-00/201).

 S 715-093

 (18)
 Make sure that these EICAS advisory messages show:

 HEAT R TAT HEAT L TAT
 S 715-103
 (19)
 Remove pressure from hydraulic system No. 1 and 4 if it is not necessary (AMM 29-11-00/201).

 S 865-095

 (20)
 Remove the actuators from switches S800 and S801.

 S 445-056

 (21)
 Do this task:  "Put Safety-Sensitive Systems Back to the Condition before Air Mode Simulation" (AMM 32-09-02/201).

 S 415-013

 (22)
 Install covers on probes after they become cool.

 S 865-061

 (23)
 Set the FUEL CONTROL 1, switch on the P8 control stand to CUTOFF.

 S 865-060

 (24)
 Close the following circuit breakers on the P6, Main Power Distribution Panel:

 (a)  
6F1, IGN 1 ENG 1

 (b)  
6K19, IGN 2 ENG 1

 (c)  
6G19, STBY IGN ENG 1

 S 865-014
 (25) Remove electrical power (AMM 24-22-00/201).
 TASK 30-31-00-715-083
 3. Ground Test - Pitot-Static/TAT/AOA Anti-Ice System
__________________________________________________
 A. General
 (1)  
This test does a check of the air mode operation of the probe heaters only.

 (2)  
This test does not do a check of the ground mode operation of the probe heaters.

 B. 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 heat diode assembly.
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MAINTENANCE MANUAL

 C. References
 (1)  AMM 24-22-00/201, Manual Control
 D. Access
 (1)  Location Zone
 221, 222 Control Cabin

 E. Preconditions
 S 865-098
 (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).

 F. Prepare for the Test
 S 865-084
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 865-086

 (2)  
Set the GND TEST switch on the P461, Overhead Maintenance Panel to ENABLE.

 S 865-087

 (3)  
Prepare the CDU for the test:

 (a)  
Push the MENU key on the CDU to show the MENU.

 (b)  
Push the line-select key (LSK) that is adjacent to <CMC to show the CMC MENU.

 (c)  
If <RETURN shows after you push the LSK, push the LSK that is adjacent to <RETURN until you see the CMC MENU.

 (d)  
Push the LSK that is adjacent to <GROUND TESTS to show the GROUND TESTS menu.

 (e)  
Push the NEXT PAGE key until you find <30 ICE AND RAIN.

 (f)  
Push the LSK that is adjacent to <30 ICE AND RAIN to show the GROUND TESTS menu for the ice and rain system.

 NOTE: If INHIBITED shows above the applicable prompt (<PROBE
____ HEAT L or <PROBE HEAT R), the test will not operate.
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