WARNING:_______DO NOT TOUCH THE PROBE. THE PROBE HEATER CAN BURN YOU.

 (b)  
Hold your hand near the probe and make sure that the probe temperature increases.

 (c)  
Close 7H8, GND SAFETY RELAY circuit breaker on the P7, Overhead Circuit Breaker Panel.

 (d)  
Make sure that the probe temperature does not continue to increase.

 S 715-010
 (4) Do a check of the probe heater operation in the engine-on mode:
 (a)  
Open 6H19, PROBE HEAT ENG 1 circuit breaker on the P6, Main Power Distribution Panel.

 (b)  
Set the S2 switch on the engine 1 N2 speed card YMLA001 (in the forward electrical systems card file M7603) to TEST.

 (c)  
Close 6H19, PROBE HEAT ENG 1 circuit breaker on the P6, Main Power Distribution Panel.

 (d)  
Make sure that the probe temperature increases.

 (e)  
Open 6H19, PROBE HEAT ENG 1 circuit breaker on the P6, Main Power Distribution Panel.

 (f)  
Set the S2 switch on the YMLA001 card to NORMAL.

 F. Engine 2, PT2/TT2 Probe Heat Test
 S 865-011
 (1)  
Close 6H21, PROBE HEAT ENG 2 circuit breaker on the P6, Main Power Distribution Panel.

 S 865-012

 (2)  
Make sure that these circuit breakers on P6, Main Power Distribution Panel are open:

 (a)  
6H19, PROBE HEAT ENG 1

 (b)  
6H23, PROBE HEAT ENG 3

 (c)  
6H25, PROBE HEAT ENG 4

 (3)  
Get access to the engine 2, PT2/TT2 probe.

 (4)  
Do a check of the probe heater operation in the air mode:

 S 015-014
 S 715-015
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 30-34-00
 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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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

 CAUTION: DO NOT OPERATE THE PROBE HEATERS FOR MORE THAN 30 SECONDS.
_______ STOP FOR 5 MINUTES AFTER YOU OPERATE THE PROBE HEATER. YOU WILL DAMAGE THE PROBE IF YOU OPERATE THE PROBE HEATER FOR TOO LONG.
 (a)  
Open 7F23, LANDING GEAR DSP & CONT ALTN circuit breaker on the P7, Overhead Circuit Breaker Panel.

 WARNING:_______DO NOT TOUCH THE PROBE. THE PROBE HEATER CAN BURN YOU.

 (b)  
Hold your hand near the probe and make sure that the probe temperature increases.

 (c)  
Close 7F23, LANDING GEAR DSP & CONT ALTN circuit breaker on the P7, Overhead Circuit Breaker Panel.

 (d)  
Make sure that the probe temperature does not continue to increase.

 S 715-016
 (5) Do a check of the probe heater operation in the engine-on mode:
 (a)  
Open 6H21, PROBE HEAT ENG 2 circuit breaker on the P6, Main Power Distribution Panel.

 (b)  
Set the S2 switch on the engine 2 N2 speed card YMLA003 (in the forward electrical systems card file M7603) to TEST.

 (c)  
Close 6H21, PROBE HEAT ENG 2 circuit breaker on the P6, Main Power Distribution Panel.

 (d)  
Make sure that the probe temperature increases.

 (e)  
Open 6H21, PROBE HEAT ENG 2 circuit breaker on the P6, Main Power Distribution Panel.

 (f)  
Set the S2 switch on the YMLA003 card to NORMAL.

 G. Engine 3, PT2/TT2 Probe Heat Test
 S 865-017
 (1)  
Close 6H23, PROBE HEAT ENG 3 circuit breaker on the P6, Main Power Distribution Panel.

 S 865-018

 (2)  
Make sure that these circuit breakers on the P6, Main Power
 Distribution Panel are open:

 (a)  
6H19, PROBE HEAT ENG 1

 (b)  
6H21, PROBE HEAT ENG 2

 (c)  
6H25, PROBE HEAT ENG 4

 (3)  
Get access to the engine 3, PT2/TT2 probe.

 (4)  
Do a check of the probe heater operation in the air mode:

 S 015-020
 S 715-021
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
　
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