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 rectified) to supply the AUTO LAND, MASTER WARNING and CAUTION lights and
 Audio Control Panels (ACP).
 The secondary winding of each transformer has:
 - 7x5VAC outputs mounted in parallel; each one is protected by a delayed
 action fuse set at 4A,
 - 2x6.3V outputs protected by the same type of fuse.
 The primary winding of each transformer has two inputs to get the correct
 dimming level (DIM position).
 If the 115V supply is switched over to either input we obtain at the
 secondary winding:
 - the 5VAC (BRT position),
 - the 3VAC (DIM position),
 - the 6.3VAC (BRT position) or 4.3VAC for rectified voltages (DIM
 position). The transformers 36LP and 37LP are housed in the panel 120VU
 and transformers 31LP and 35LP are mounted on the overhead panel.
 B. Five Circuit Breakers
 - busbar 103XP (AC1) supplies transformer 37LP through the circuit
 breaker 26LP located on the circuit breaker panel 122VU,
 - busbar 202XP (AC2) supplies transformer 36LP through the circuit
 breaker 27LP located on the circuit breaker panel 122VU,
 - busbar 801XP supplies transformer 31LP through the circuit breaker 29LP
 located on the overhead panel 49VU,
 - busbar 801XP supplies transformer 35LP through the circuit breaker 29LP
 and the busbar 901XP provides emergency supply through the circuit
 breaker 28LP located on the circuit breaker panel 122VU,

 

 - busbar 206PP supplies the annunciator light test relay coils.
 C. Switch 33LP
 A switch with 3 positions: DIM, BRT, TEST is located on the overhead
 control and indicating panel 25VU.
 D. Fourteen Annunciator Light Test and Interface Boards
 They are located in the avionics compartment in the annunciator light
 test unit 70VU:
 - 4 are associated with the annunciator lights supplied by the AC1
 system.
 They are identified by FINs 1LP to 4LP.
 - seven are associated with the annunciator lights supplied by the
 essential generation. They are identified by FINs 5LP to 11LP.
 Three are associated with the annunciator lights supplied by the AC2
 generation.
 They are identified by FINs 18LP to 20LP.
 Each board comprises:
 - 2 relays supplied by busbar 206PP with 28VDC through circuit breaker
 30LP located on the rear circuit breaker panel 122VU.
 These 2 relays serve for the annunciator light tests when the switch
 33LP is in the TEST position.
 - 10 relays supplied by the various A/C systems with 28VDC. They supply
 the annunciator light with 5VAC whereas the system data are supplied
 with 28VDC.
 E. Four-Stage Relays
 They are located in the relay box 103VU. They all are identified with a
 TEST placard. They serve for the test of the equipment annunciator lights
 (high intensity) or of other annunciator lights (ON - OFF).
 The busbar 206PP supplies 28VDC to the coil of these relays through the
 circuit breaker 30LP located on the rear circuit breaker panel 122VU.
 4. Operational/Control and Indicating__________________________________ 
R 
R  (Ref. Fig. 004) 
R  A. Annunciator Light Test for the External Power Panel 108VU 
R  The LIGHT TEST pushbutton switch 34LP on the panel 108VU serves to test 
R  the EXT PWR/NOT IN USE, EXT PWR/AVAIL, COCKPIT CALL, APU FIRE and ADIRU & 
R  AVNCS VENT indicator lights. 
R  The ADIRU & AVNCS VENT caution light is supplied from the 28VDC HOT BUS 
R  704PP through the circuit breaker 6FP1 located on the circuit breaker 
R  panel 105VU. 
R  The EXT PWR/NOT IN USE, EXT PWR/AVAIL, COCKPIT CALL and APU FIRE 
R  indicator lights are supplied from the 28VDC BUSBAR 1IWPP through the 
R  circuit breaker 4XG located on the circuit breaker panel 122VU.

 

 Annunciator Light Test and Dimming - Principle Diagram Figure 003 (SHEET 1)
 1EFF : ALL 1 33-14-00Page 6 1 1 May 01/05R 1 1 1CES 1

 Annunciator Light Test and Dimming - Principle Diagram Figure 003 (SHEET 2)
 1EFF : ALL 1 33-14-00Page 7 1 1 May 01/05R 1 1 1CES 1

 Control and Indicating-Panel 108VU
 Figure 004
 1EFF :  ALL  1  33-14-00 Page 8 
1  1  Feb 01/98
 1  1
 1CES  1

 

R  If ground power is not available, only the ADIRU & AVNCS VENT caution 
　
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