30-81-00
 ALL  ú ú 01 Page 503 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (b)  
Wing anti-ice system is serviceable (AMM 30-11-00/501).

 (c)  
Engine anti-ice system is serviceable (AMM 30-21-00/501).

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

 (e)  
Air/ground relay system is serviceable (AMM 32-09-02/201).

 F. Procedure
 NOTE: The engines must not be in operation during this test.
____ S 865-037
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 745-047

 (2)  
Do this task for the left ice detector probe: Ground Test - Ice Detection System.

 S 745-048

 (3)  
Do this task for the right ice detector probe: Ground Test - Ice Detection System.

 S 285-036

 (4)  
Hold your hand adjacent to each ice detector probe to make sure that it is not hot.

 S 865-034

 (5)  
Set the WING ANTI-ICE switch and the NACELLE ANTI-ICE 1, 2, 3, and 4 switches on the anti-ice/rain removal module (P5 panel) to OFF.

 S 045-031
 WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO PREPARE
_______ THE SAFETY-SENSITIVE SYSTEMS FOR THE AIR MODE. FAILURE TO DO THE STEPS CORRECTLY CAN CAUSE THE AUTOMATIC OPERATION OF AIRPLANE SYSTEMS. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (6)  Do this task: "Prepare Safety-Sensitive Systems for Air Mode Simulation" (AMM 32-09-02/201).
 NOTE: The EICAS advisory message ICE DETECTOR and status messages
____ ICE DETECTOR L and ICE DETECTOR R will show when the airplane is in the air mode.
 S 865-023
 (7)  Open these circuit breakers:
 (a)  P7, Overhead Circuit Breaker Panel
 1) 7F23, LANDING GEAR DSP & CONT ALTN
 2) 7H8, GND SAFETY RELAY

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 30-81-00
 ALL  ú ú 03 Page 504 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 S 715-024
 (8)  Do a check of the control of the engine anti-ice systems by the left ice detector:
 NOTE: Use a wet cloth or a piece of ice to cool the probe strut
____ (not the probe tip) while you do this test. This helps to increase the life of the probe.
 WARNING: YOU MUST USE A HEAT-RESISTANT GLOVE WHEN YOU OPERATE THE
_______ ICE DETECTOR. THE ICE DETECTOR QUICKLY BECOMES VERY HOT AND CAN BURN YOU.
 (a)  
Put on a heat-resistant glove.

 (b)  
Apply pressure to the probe tip with your thumb and forefinger for one to two seconds.

 (c)  
Release the probe tip for 10 to 15 seconds.

 (d)  
Apply pressure to the probe tip for one to two seconds.

 (e)  
Release the probe tip.

 (f)  
Make sure that the EICAS caution message >ICING NAC shows for approximately 180 seconds.

 S 715-030
 (9)  Do a check of the control of the engine anti-ice systems by the right ice detector:
 NOTE: Use a wet cloth or a piece of ice to cool the probe strut
____ (not the probe tip) while you do this test. This helps to increase the life of the probe.
 WARNING: YOU MUST USE A HEAT-RESISTANT GLOVE WHEN YOU OPERATE THE
_______ ICE DETECTOR. THE ICE DETECTOR QUICKLY BECOMES VERY HOT AND CAN BURN YOU.
 (a)
With a heat-resistant glove, apply pressure to the probe tip with your thumb and forefinger for one to two seconds.

 (b)  
Release the probe tip for 10 to 15 seconds.

 (c)  
Apply pressure to the probe tip for one to two seconds.

 (d)  
Release the probe tip.

 (e)  
Make sure that the EICAS caution message >ICING NAC shows for approximately 180 seconds.

 S 865-028
 (10) Close these circuit breakers:
 (a)  P7, Overhead Circuit Breaker Panel 1) 7F23, LANDING GEAR DSP & CONT ALTN 2) 7H8, GND SAFETY RELAY
　
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