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B.  The system is used to signal crewmembers in the flight or passenger compartments or ground maintenance personnel to use the service interphone system to communicate with the person initiating the call.
C.  When the GRD CALL switch on the forward overhead panel is pressed, 28-volt dc power is applied to the call horn causing it to sound. This gains the attention of personnel outside the airplane.
D.  When the PILOT CALL switch on the external power receptacle panel or the CAPTAIN CALL switch on an attendant's panel is pressed, 28 -volt dc power is applied to the hi-tone chime causing it to sound. This gains the attention of personnel in the flight compartment. When either switch is pressed, the blue call light on the passenger signs panel comes on to provide an additional call indication in the flight compartment.
E.  When the ATTEND call switch is pressed in the flight compartment or an ATTENDANT call switch is pressed on an attendants' panel, 28-volt dc power is applied to the forward and aft pink master call lights causing them to come on and to the hi-lo chime in the PA amplifier causing the tones to be broadcast over the PA system. In addition, electrical power is applied to the crew call relay in the forward attendant's panel causing it to energize and keep power applied to the lights after the call switch has been released.
F.  When the RESET switch on either attendants' panel is pressed, electrical power is removed from the crew call relay causing it to de-energize and turn off the forward and aft master call lights.
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FLIGHT AND GROUND CREW CALL SYSTEMS - TROUBLE SHOOTING
1. General
A.  Failure of the ground crew call horn or call button is immediately apparent if the call button on pilot's overhead panel P5 fails to operate the horn. Replacing the call button usually will correct the problem; if not, replace the horn.
B.  The captain's call chime is operated from external ground power panel P19 and the forward and aft attendants' panels. Failure of the chime to operate when all the captain call buttons are pressed requires that the aural warning devices box be replaced. If the chime fails to operate when keyed from just one station, replacing the call button will usually correct the problem.
C.  Failure of the attendants' call chime circuits in the PA amplifier is immediately apparent if the chime will not sound when keyed from several stations. Replacement of the PA amplifier will usually correct the problem. If the chime fails to operate when keyed from just one station, replace the call button. If both pink master call lights fail to remain illuminated when an attendant call button is pressed, the call relay or one of the reset buttons is probably faulty. On all passenger airplanes, the call relay is located in the forward attendant's panel. On all passenger/cargo convertible airplanes, the call relay is located in the aft attendant's panel. If replacement of the call relay fails to correct the problem, check for continuity through both reset buttons and replace the faulty reset button.
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May 01/74  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  23-43-0 Page 101 

FLIGHT AND GROUND CREW CALL SYSTEM - ADJUSTMENT/TEST
1.  Flight and Ground Crew Call SystemTest
A.  Prepare to test flight and ground crew call system.
(1)  
Provide electrical power.

(2)  
Check that PASS AND CREW CALL and PASSENGER ADDRESS circuit breakers on P18 panel are closed.

(3)  
Check that AURAL WARNING circuit breaker on P6-2 panel is closed.

B.  Test flight and ground crew call system.
(1)  
Press GRD CALL switch on overhead panel P5 and check that ground crew call horn sounds. Release switch and check that sound stops.

(2)  
Press PILOT CALL switch on external ground power panel P19 and check that:

(a)  
CALL light on overhead panel P5 comes on.

(b)  
Hi-tone chime sounds once in flight compartment.

(c)  
CALL light goes off when PILOT CALL switch is released.

 

(3)  
Press CAPTAIN call switch on forward attendant's panel and check that:

(a)  
CALL light on overhead panel P5 comes on.

(b)  
Hi-tone chime sounds once in flight compartment.

(c)  
CALL light goes off when CAPTAIN switch is released.

 

(4)  
Repeat step 1.B.(3) at aft attendant's panel.

(5)  
Press ATTEND call switch on overhead panel P5 and check that:

(a)  
Forward and aft pink master call lights come on.

(b)  
Hi-lo tone chime sounds once over PA speakers.
　
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