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R  lavatory. The duct divides into two dropper ducts and follows the 
R  fuselage contour downwards (on each side of a window) to the fan. The 
R  air is then removed overboard through the outflow valve 10HL. The 
R  extraction fan operates continuously during flight and also on the 
R  ground when electrical power is available to the aircraft. 
R  (2) Extraction Ducts 
R  The extraction ducts are made from resin and glassfiber laminate with 
R  metal sleeves bonded to each end for duct interconnection. All ducts 
R  are connected to each other by flexible bellows made of silicone 
R  laminate and glassfiber secured by clamps. Capped branches along the 
R  duct allow the installation of lavatories and galleys at different 
R  locations in the cabin. Flexible hoses from the extraction duct are 
R  connected to cabin temperature sensor-housings (Ref. 21-63-00).

 

 C. System Performance (Flow Rates)
 (1)
 Lavatory
 The total flow rate for each lavatory is 12 l/s.

 (2)
 Cabin Temperature Sensor-Housing The flow rate through each of the two cabin temperature sensor-housings is 3.5 l/s.

 (3)
 Galley Galley sizes are determined by the electrical power (Kw) installed:

 -small galley 0-7.0 Kw flow rate 25 l/s,
 -normal galley 7 to 17.0 Kw flow rate 40 l/s,
 -large galley > 17,0 Kw flow rate 50 l/s. The total flow rate of the defined lavatory and galley extraction system is 143 l/s. This is a mass flow of 170 g/s on ground and 133 g/s in flight. Duct velocities of the system are below 14 m/s in the whole cabin area.
 4.
 Power Supply

____________
 (Ref. Fig. 002)

 5.
 Interface

_________

R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
 The lavatory and galley ventilation system has interfaces with the zone controller 8HK of the cockpit and the cabin temperature control-system (Ref. 21-63-00),

R **ON A/C 401-499,
 The lavatory and galley ventilation system has an interface with the air conditioning system controllers (ACSC) (Ref. 21-61-00).

 Lavatory and Galley Ventilation System - Electrical Schematic Figure 002
 1EFF : ALL 1 21-23-00Page 6 1 1 Feb 01/00R 1 1 1CES 1

 **ON A/C ALL
 6. Component Description
_____________________
 (Ref. Fig. 003)

 A. Extraction Fan The lavatory and galley extraction fan 1HU is installed in line with the extraction duct. It is powered by a three-phase induction motor that drives a fan wheel which has high-efficiency blades. The fan operates continuously at about 11700 rpm. Thermo switches are installed inside the stators of the extraction fan. If the temperature of the stator increases to between 134 DEG.C (273.20 DEG.F) and 146 DEG.C (294.80 DEG.F), the thermo switches isolate the electrical supply to the fan. The lavatory and galley extraction fan is secured by clamps to brackets on the aircraft structure in the rear underfloor area. Arrows on the fan casing show the direction of airflow through the fan and the direction that the impellor rotates.
 7. Operation/Control and Indication
________________________________

R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
 A. Operation of the Lavatory and Galley Extraction Fan The lavatory and galley extraction fan 1HU operates continuously. 28 V DC from normal busbar 101PP through circuit breaker 5HU energizes the power relay 2HU. The power relay energizes the extraction fan with 115 V AC from normal busbar 101XP through circuit breaker 6HU. Thermo switches protect the fan from overheating. If the temperature of the stators increases to between 134 DEG.C (273.20 DEG.F) and 146 DEG.C (294.80 DEG.F), the ground is removed from the power relay.
 B. Control and Indication The lavatory and galley extraction fan 1HU is continuously monitored by the zone controller 8HK of the cabin temperature control-system (Ref 21-63-00). If an overheat of the lavatory and galley extraction fan 1HU occurs, the thermo switches of the fan stop the electrical power supply through the power relay 2HU. The fan stops and the indicating relay 4HU opens. The indicating relay 4HU gives a signal to the zone controller 8HK (Ref. 21-63-00). The zone controller gives a signal to the Electronic Instrument System (EIS) (Ref. 31-60-00) and to the Centralized Fault-Display System (CFDS) (Ref. 31-30-00).

 Extraction Fan (1HU) Figure 003
 1EFF : 1 1R 1CES  ALL  1 11 1 21-23-00 Page 8 Feb 01/05

 

R **ON A/C 401-499,
 A. Operation of the Lavatory and Galley Extraction Fan The lavatory and galley extraction fan 1HU operates continuously. 28 V DC from normal busbar 101PP through circuit breaker 5HU energizes the power relay 2HU. The power relay energizes the extraction fan with 115 V AC from normal busbar 101XP through circuit breaker 6HU. Thermo switches protect the fan from overheating. If the temperature of the stators increases to between 134 DEG.C (273.20 DEG.F) and 146 DEG.C (294.80 DEG.F), the ground is removed from the power relay.
　
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