A. Aircraft Maintenance Configuration
 (1)
 Energize the aircraft electrical circuits
 (Ref. TASK 24-41-00-861-002)

 (2)
 Make sure that at least one cabin door is open.

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 B. Make sure that this(these) circuit breaker(s) is(are) closed:
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------
49VU COM/CIDS/DEU A ESS/LINE 2 49VU COM/CIDS/DEU A ESS/LINE 1 49VU COM/CIDS/DEU B/ESS  155RH 154RH 153RH  G05G04G03 
R  **ON A/C 001-049, 051-099, 101-105, 201-299,
 49VU COM/CIDS/DIR 1 AND 2/ESS  150RH  G02
 **ON A/C 151-199,
 49VU COM DIR ESS/2 49VU COM DIR ESS/1  157RH 150RH  G02G01 
R  **ON A/C 001-049, 051-061, 101-105, 201-203,
 121VU COM NAV/CIDS/FWD ATTND/PNL  170RH  M14 
R  **ON A/C 001-049, 051-099, 101-105, 201-299,
 121VU COM NAV/CIDS/DEU A NORM/R AFT 121VU COM NAV/CIDS/DEU A NORM/L AFT 121VU COM NAV/CIDS/DEU A NORM/R MID 121VU COM NAV/CIDS/DEU A NORM/L MID 121VU COM NAV/CIDS/DEU A NORM/R FWD 121VU COM NAV/CIDS/DEU A NORM/L FWD 121VU COM NAV/CIDS/DEU B/NORM 121VU COM NAV/CIDS/PROG AND TST PNL  168RH 167RH 166RH 165RH 164RH 163RH 162RH 161RH  M13M12M11M10M09M08M07M06 
R  **ON A/C 001-049, 051-099, 101-105, 151-199, 201-299,
 121VU COM NAV/CIDS/DIR 1 AND 2/NORM  151RH  M05 

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 -------------------------------------------------------------------------------
R  PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------**ON A/C 062-099, 204-299, 
R R  121VU COM NAV/CIDS/FWD ATTND/PNL  170RH  Q14 
R  **ON A/C 151-199, 
R R R R R R R R R R  121VU COM NAV/CIDS/DEU A NORM/R AFT 121VU COM NAV/CIDS/DEU A NORM/L AFT 121VU COM NAV/CIDS/DEU A NORM/R MID 121VU COM NAV/CIDS/DEU A NORM/L MID 121VU COM NAV/CIDS/DEU A NORM/R FWD 121VU COM NAV/CIDS/DEU A NORM/L FWD 121VU COM NAV/CIDS/DEU B/NORM 121VU COM NAV/CIDS/PROG &/TST PNL 121VU COM NAV/CIDS/DIR NORM/2 121VU COM /CIDS/FLT ATTND/PNL  168RH 167RH 166RH 165RH 164RH 163RH 162RH 161RH 156RH 170RH  M14 M13 M12 M11 M10 M09 M08 M07 M06 Q14 
R  **ON A/C 001-049, 051-099, 101-105, 151-199, 201-299,
 4. Procedure_________ 
R  **ON A/C 001-049, 051-099, 101-105, 201-299,
 Subtask 23-73-00-710-051
 A. Do this test.
 -------------------------------------------------------------------------------ACTION RESULT -------------------------------------------------------------------------------
1. On the C/B Panel 49VU:
 - open the C/B DIR 1 AND 2/ESS 150RH.
 2. On the Overhead Panel 25VU:  In the cabin: 

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 -------------------------------------------------------------------------------
ACTION RESULT -------------------------------------------------------------------------------
- set the SIGN SEAT BELT switch  - all FASTEN SEAT BELT (FSB) signs come
 191RH to the ON position.  on.
 3. On the C/B Panel 49VU:
 - close the C/B DIR 1 AND 2/ESS
 150RH.
 4. On the C/B Panel 121VU:
 - open the C/B DIR 1 AND 2/NORM
 151RH.
 5. On the C/B Panel 121VU:
 - open the C/Bs DEU A/NORM 163RH  - all FSB signs go off.
 to 168RH.
 6. In the cabin at the FWD ATTND  In the cabin and the lavatories through
 Station:  the loudspeakers:
 - remove the handset from the
 cradle,
 - push the PA ALL pushbutton,
 - push the PTT and do an  - the announcement is heard.
 announcement.
 7. At the FWD ATTND Station:
 - release the PTT.
 - put the handset back into its
 cradle.
 8. On the Overhead Panel 25VU:
 - set the SIGN SEAT BELT switch
 191RH to the OFF position.
 9. On the C/B Panel 121VU: 

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