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 3.  Attendant's Panel
_________________
 A.  The forward attendant panel (P13) and the aft attendant panel (P14) are located at the lavatories near the entry doors. Each panel contains a CAPTAIN, ATTENDANT, and RESET momentary pushbutton switch. The CAPTAIN call switch is used to call the flight crew, the ATTENDANT call switch calls the attendants, and the RESET switch turns off the attendant call lights.
 4.  Attendant's Call Light
______________________
 A.  The forward and aft attendant call lights are located on the underside of the exit locater signs. The attendant call lights are pink.
 5.  Pilot Call Switch
_________________
 A.  The PILOT CALL momentary pushbutton switch is located in the external power receptacle panel, P19. The PILOT CALL switch is used by the ground crew to call the flight crew.
 6.  Ground Crew Call Horn
_____________________
 A.  The ground crew call horn is an electromechanical device located in the nose wheel well, station 230. The flight crew uses the horn to signal the ground crew to use the interphone.
 B.  The ground crew call horn also serves as an audible warning device for the IRS (inertial reference system). With the air-ground relay set to ground, the horn sounds whenever the IRS is powered by its battery, or whenever the IRS is on and the equipment cooling fan is not operating (Ref 34-28-01 Honeywell IRU or 34-28-02 Litton IRU).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

Figure 2
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 7. Operation (Fig. 2)
_________
 A. Functional Description
 (1)  
The flight and ground crew call system is turned on by closing the PASS & CREW CALL (or PASS & CREW CALL/LAV SMK DET) circuit breaker, as applicable, on load control center panel, P18. Power to the circuit breaker comes from the 28v dc bus No. 1.

 (2)  
The CREW CALL HORN circuit breaker on the P6 panel powers the ground crew horn on the nose wheel well area.

 (3)  
The call system is used to signal the flight crew, attendants, or ground crew to talk on the service interphone system.

 (4)  
Pressing the PILOT CALL switch on the P19 external power receptacle panel, or the CAPTAIN call switch on either attendant panel, applies 28v dc power to the pilots' CALL light and to the aural warning unit. The CALL light comes on and stays on only while the call switch is pressed. The aural warning unit sounds a single chime.

 (5)  
Pressing the ATTEND call switch on the forward overhead panel P5, or the ATTENDANT call switch on either of the attendant panels, applies 28v dc power to the attendant call lights, to the attendant call relay, and to the chime in the PA amplifier. The PA amplifier sounds a chime over the PA system. Also, the attendant call relay holds the call lights on until reset with the RESET switch on either attendant panel.

 (6)  
The RESET switches on the attendant panels are connected in series. Thus, pressing one removes power from the attendant relay and makes the call lights go off.

 (7)  
Pressing the GRD CALL switch on the forward overhead panel P5 applies 28v dc power to the ground crew call horn. The horn will sound as long as the switch is pressed.

 (8)  
The ground crew call horn also serves as an audible warning device for the IRS (inertial reference system). The IRS warning system relay comes on in the flight instrument accessory unit or integrated flight instrument accessory unit, and applies 28v dc power to the ground crew call horn, whenever the IRS is powered by its battery or the IRS is turned on and the equipment cooling fan is not operating. The air-ground relay must be in the ground position before the IRS warning system relay can energize. See Ref 34-28-01 for Honeywell IRU or Ref 34-28-02 for Litton IRU.

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