B.  
Access

 (1)  
Location Zone 118 Forward (Main) and Center Electronic Bay Access Doors 211 Main Deck, Nose to First Door, LH 224 Upper Deck Crew Rest, RH 271 Main Deck, STA 2040 To STA 2360, LH

 (2)  
Access Panel
 117A Door - Electronics Compartment Access
 125B Door - Electronics Access
 831L Door - No. 1 Main Entry, LH
 835L Door - No. 5 Main Entry, LH
 849R Door - Upper Deck Crew Service

 C.  
Procedure

 S 865-020
 (1)  
Make sure these doors are closed and latched:

 (a)  
The main entry doors

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747-400 MAINTENANCE MANUAL
 (b)  
The crew service door

 (c)  
The overhead hatch

 (d)  
The access doors for the electronic compartments.

 S 865-021
 (2)  
Supply electrical power (AMM 24-22-00/201).

 S 715-022

 (3)  
Do a test of the warning system on left main entry doors No. 1 and No. 5 as follows:

 (a)  
Close and latch both main entry doors.

 (b)  
Make sure no entry door EICAS message shows.

 (c)  
Open the left main entry door No. 1.

 (d)  
Make sure the EICAS message DOOR ENTRY L1 shows.

 (e)  
Close the left main entry door No. 1.

 (f)  
Make sure the EICAS message ENTRY DOOR L1 does not show.

 (g)  
Open the left main entry door No. 5.

 (h)  
Make sure the EICAS message DOOR ENTRY L5 shows.

 (i)  
Close the left main entry door No. 5.

 (j)  
Make sure the EICAS message DOOR ENTRY L5 does not show.

 S 715-023
 (4)  
Do a test of the warning system on the crew service door as follows:

 (a)  
Close and latch the crew service door.

 (b)  
Make sure the EICAS message DOOR R UPPER DK does not show.

 (c)  
Open the crew service door.

 (d)  
Make sure the message DOOR R UPPER DK shows on the EICAS display.

 (e)  
Close the upper deck crew service door.

 (f)  
Make sure the message DOOR R UPPER DK does not show on the EICAS display.

 S 715-074
 (5)  Do a test of the warning system for the external access doors for the electronic equipment compartments.
 NOTE: This test refers to the electronic equipment compartments
____
 as "compartments".

 (a)  
Open the access door on the forward compartment.

 (b)  
Make sure that the EICAS message DOOR ELEC MAIN shows

 (c)  
Open the access door on the center compartment.

 (d)  
Make sure EICAS message DOORS ELEC shows.

 (e)  
Close the access door on the forward compartment.

 (f)  
Close the access door on the forward compartment.

 (g)  
Make sure the EICAS message DOOR ELEC CTR shows.

 (h)  
Make sure EICAS message DOORS ELEC does not show.

 (i)  
Close the access door on the center compartment.

 (j)  
Make sure the EICAS message DOOR ELEC CTR does not show.

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 S 715-075
 (6)  
Do a test of the warning switch on the overhead hatch.

 (a)  
Open the overhead hatch.

 (b)  
Make sure the DOOR F/D OVHD shows on EICAS.

 (c)  
Close the overhead hatch.

 (d)  
　
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