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 E.  The ground crew call horn will also sound when the equipment cooling system fails, or when an inertial reference unit (IRU) is left to operate on dc battery power.
Component Details (Fig. 1)
_________________
 A.  Ground Call Switch__________________
 (1)  The GND CALL switch is on the pilots' call panel, which is on overhead panel P5. The call horn operates as long as the pilot pushes the switch. Inside the GND CALL switch, a lamp comes on when ground crew pushes the FLIGHT DECK CALL SW button at the nose wheel.
 B.  Flight Deck Call Switch_______________________
 (1)  
The FLIGHT DECK CALL SW button is on the P62 CONTROL PANEL. To call the flight compartment from the nose wheel, ground crew personnel push the button. This step makes the GND CALL light come on at the pilots' call panel and sounds the chime in the flight compartment. A related circuit keeps the light on for 30 seconds.

 (2)  
The chime sound comes from the bell chime module, M1000. It is in the warning electronics unit P51, which is located in the main equipment center. The bell chime module has a chime generator and amplifiers to energize the aural warning loudspeakers.

 C.  Ground Crew Call Horn_____________________
 (1)  The attention of personnel outside the airplane is gained by pressing the GND CALL switch. The ground crew call horn in the nose wheel well, will sound when the GND CALL switch is pressed. The crew call horn produces a continuous tone, and operates at 28v dc.
Operation (Fig. 2)
_________
 A.  Functional Description______________________
 (1)  The GND CALL circuit breaker on overhead panel P11 controls power to the system. Power from the circuit breaker is routed to the ground crew call relay located in the pilots' call panel and to the FLIGHT DECK CALL SW and GND CALL switches.
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A

757
MAINTENANCE MANUAL

PILOTS' CALL
PANEL

P5 PANEL SEE A P11 PANEL
GROUND CREW CALL HORN
SEE B
NOSE GEAR WHEEL WELL
SELCAL
L-VHF-R L-HF-R
FLIGHT COMPARTMENT  B B B B
CABIN CALL
GND FWD MID AFT ALERT CALL
ALERT BBBAB
PILOTS' CALL PANEL
A
P62
CONTROL
PANEL

SEE C
MOM ON
S10035 EMER LT TEST SW
OFF
DOO425 SERVICE INTERPHONE
DOO435
 FLIGHT
INTERPHONE

NOSE LANDING GEAR
FLIGHT DECK S00426CALL SW
FIGHT DECK CALL SW
GROUND CREW CALL HORN  P62 CONTROL PANEL
B C
Ground Crew Call System Component Location
Figure 1

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A
757
MAINTENANCE MANUAL

PILOTS CALL PANEL (P5)
Ground Crew Call System Schematic

Figure 2

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757
MAINTENANCE MANUAL

 (2)  
Flight compartment calling from the P62 CONTROL PANEL is controlled by the FLIGHT DECK CALL SW button and the ground crew call relay. When the FLIGHT DECK CALL SW button is pressed, a hold-in circuit keeps the ground crew call relay energized for 30 seconds. The ground crew call relay, when energized, lights the pilots' call panel GND CALL light and generates a single chime over the aural warning speakers.

 (3)  
When the GND CALL switch is pressed, power is applied to the ground crew call horn through the de-energized contact of the IRS warning relay. The ground crew call horn will sound for as long as the GND CALL switch is pressed.

 (4)  
The IRS warning relay can be energized by a control signal from the equipment cooling system (Ref 21-58-00/001). The ground crew call horn will sound to indicate equipment cooling failures.
　
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