PASSENGER CALL SYSTEM - DESCRIPTION AND OPERATION
EFFECTIVITY
Wide-Body Look and Carry-All Compartment Interior
1. General
A. The attendant call system enables individual passengers to signal attendants for assistance. ATTENDANT CALL buttons are located on each passenger service unit in the passenger cabin and in each lavatory. Pressing a call button sounds a high-tone chime over the passenger address system and turns on lights to identify source of call (Fig. 1).
B. The 28-volt dc bus No. 1 supplies system electrical power from the passenger and crew call circuit breaker on the P18 panel. The passenger call circuit is electrically connected to the passenger address system high-tone chime sound input (Ref 23-31-0, Passenger Address System).
2. Passenger Seat Calls
A. A push-on, push-off, ATTENDANT CALL switch is located on each passenger service unit. Pressing the attendant call switch provides 28 volts dc to the switch light on the PSU and a blue master call light on the lowered ceiling, and momentarily provides 28 volts dc to the passenger address amplifier high-tone chime input. This sounds a single high-tone chime over the PA speakers and turns the row number and master call lights on. Again pressing the attendant call switch on the PSU turns the switch and master call lights off (Fig. 2).
B. The passenger seat master call lights are located on the forward and the aft lowered ceilings. The forward master call light will come on for calls originating in the forward attendant's service area. The aft master call lights will come on for calls from the aft attendant's service area.
3. Passenger Lavatory Calls
A. A push-on, pull-off ATTENDANT CALL pushbutton switch is located in each lavatory. Pressing the attendant call switch provides 28 volts dc momentarily to the passenger address amplifier high-tone chime input and to two amber lights in the applicable master call module as long as the switch is left in the pushed position. This sounds a high-tone chime over the PA speakers and causes the amber master call light on the adjacent lowered ceiling to come on. Pulling the attendant call switch in the lavatory turns the amber call lights off and returns the circuit to ready condition (Fig. 2).
Nov 15/78 33-25-01 Page 1
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Passenger Call System Component Location 515
33-25-01 Figure 1 Aug 15/78
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
F68141
501 Passenger Call Simplified Schematic
Jan 20/82 Figure 2 33-25-01
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
PASSENGER CALL SYSTEM – TROUBLE SHOOTING
EFFECTIVITY
ALL EXCEPT ATI Interior PASSENGER AND LAVATORY CALL LIGHTS - DESCRIPTION AND OPERATION
TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
Chime does not sound when call switch activated. Other indications normal Call switch light on PSU does not come on when switch is activated. Other indications normal Master call light on lowered ceiling (forward or aft) does not come on when call light Call switch PA amplifier Switch lamp or switch Call switch Master call light Activate another call switch. If chime sounds – If chime fails to sound ------Activate another call switch. If light comes on – If light remains off - Replace switch Trouble shoot PA amplifier (Ref Chapter 23) Relamp. If not OK, replace switch Replace call switch Replace master call light
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EFFECTIVITY
ATI INTERIOR
1. General (Fig. 1)
A. A lavatory call switch is located in each lavatory. The lavatory call lights are on exit locator signs near the forward and aft entry doors. Passenger call switches are on PSU's at each seating group. The passenger call lights are also on the exit locators. The lights are illuminated and a high tone chime is sounded when a call switch is pressed within a lavatory or at a PSU.
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