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A 
747-400 
MAINTENANCE MANUAL
 6) 6D31 PROBE HEAT PITOT R
 7) 6D32 PROBE HEAT AUX PITOT L
 8) 6D33 PROBE HEAT AUX PITOT R
 9) 6D34 PROBE HEAT IND L
 10) 6D35 PROBE HEAT IND R
 (d)  Make sure that after 32 seconds there are no equipment cooling
 messages are shown on EICAS.
 (e)  Make sure the ground exhaust is closed.
 (f)  Make sure that after 32 seconds there are no equipment cooling
 messages shown on EICAS.
 (g)  Make sure the ground exhaust valve is open.
 (h)  Make sure that after 32 seconds there are no equipment cooling
 messages shown on EICAS.
 (i)  Make sure the ground exhaust valve is closed.
 (j)  Make sure that after 32 seconds there are no equipment cooling
 messages shown on EICAS.
 (k)  Make sure the ground exhaust valve is open.
 (l)  Make sure that after 32 seconds there are no equipment cooling
 messages shown on EICAS.
 (m)  Make sure the ground exhaust valve is closed.
 (n)  Make sure that after 32 seconds there are no equipment cooling
 messages shown on EICAS.
 (o)  Make sure the ground exhaust valve is open.
 (p)  Apply a ground to diode M4099-C (TD433 pos 108) in the P414
 panel.
 (q)  Make sure the supply fan is on.
 (r)  Make sure the exhaust fan is off.
 (s)  Make sure the inboard supply valve, the inboard exhaust valve,
 and the ground exhaust valve is closed.
 (t)  Make sure the bypass valve and the E6/E9 valve are open.
 (u)  Make sure the 3-way valve is set to C-B (port A closed).
 (v)  Remove the ground from diode M4099-C.
 (w)  Make sure the supply fan and the exhaust fan are on.
 (x)  Make sure the inboard supply valve, the inboard exhaust valve,
 and the E6/E9 valve are open.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (y)  
Make sure the bypass valve and the ground exhaust valve are closed.

 (z)
Make sure the 3-way valve is set to C-B (port A closed). (aa) Apply a ground to the DQ2442 - E1 pin on the E2-4 shelf. (ab) Install a jumper between pins 1 and 2 of the skin temperature

 switch electrical connector (DS1888). (ac) Make sure the ground exhaust valve is closed. (ad) Make sure that after 32 seconds there are no equipment cooling
 messages shown on EICAS. (ae) Remove the jumper from the skin temperature switch electrical
 connector (DS1888). (af) Make sure the ground exhaust valve is open. (ag) Make sure that after 32 seconds there are no equipment cooling
 messages shown on EICAS. (ah) Install the electrical connector DS1888 on the skin temperature
 switch. (ai) Remove the ground from the DQ2442 - E1 pin on the E2-4 shelf. (aj) Close these circuit breakers:
 1) 6C33 AOA HEAT L
 2) 6C34 AOA HEAT R
 3) 6D28 PROBE HEAT TAT L
 4) 6D29 PROBE HEAT TAT R
 5) 6D30 PROBE HEAT PITOT L
 6) 6D31 PROBE HEAT PITOT R
 7) 6D32 PROBE HEAT AUX PITOT L
 8) 6D33 PROBE HEAT AUX PITOT R
 9) 6D34 PROBE HEAT IND L
 10) 6D35 PROBE HEAT IND R

 S 865-037
 WARNING: YOU MUST CAREFULLY FOLLOW THE STEPS IN THE SPECIFIED TASK TO
_______ PUT THE AIR/GROUND RELAY SYSTEM IN THE AIR MODE. FAILURE TO FOLLOW THE STEPS CORRECTLY CAN CAUSE THE AUTOMATIC OPERATION OF THE AIRPLANE SYSTEMS. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (40) Do the "Put the Air/Ground Relay System in the Air Mode" task (Ref 32-09-02/201).
 (a)  Make sure the bypass valve, ground exhaust valve, inboard supply valve, inboard exhaust valve and E6/E9 valve are closed.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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 ALL  ú ú 14 Page 536 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
　
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