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 **ON A/C 301-302,

 B. Exit Signs
 The exit signs consist of a plastic case housing, a lens and a number of LED connected in parallel. There are different types:
 (1)
 The ceiling-mounted exit location signs 50WL and 52WL, single-sided, one for the forward and one for the aft passenger/crew doors.

 (2)
 The ceiling-mounted exit location signs 51WL, 53WL, 54WL and 55WL, single-sided, two for each pair of the emergency exit doors.

 (3)
 The exit marking signs 40WL thru 47WL, single-sided, one for each passenger/crew door and one for each emergency exit door.

 C. Cabin Emergency Lights
 (1) The cabin-emergency light units 20WL, 21WL, 32WL thru 37WL and 200WL thru 210WL consist of a housing, a lens and a number of LED connected in parallel.
 D. External Lights
 (1) The escape slide lights, integrated in the escape slides, consist of a number of 6VDC lamps.
 E. Floor Proximity Lights
 (1)
 The floor-mounted floor-proximity emergency escape-path marking-lights consist of flexible 115VAC light strips installed in plastic case housings along the aisle.

 (2)
 The wall-mounted emergency exit-markers 90WL1 thru 90WL8, single sided, one for each passenger/crew door and one for each emergency exit door, contain a 115VAC luminescent light.

 F. System Control
 (1) The EMER EXIT LT switch 4WL on the overhead panel 25VU is a 3-position double-pole toggle switch. It is used to switch the emergency lighting system on (ON position) and off (OFF position). The emergency lighting comes on automatically when the toggle switch is selected to ARM, if the battery busbar power fails. The toggle switch must be pulled to make a selection. This prevents accidental system selection.
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 (2)
 The emergency lighting system comes on when the LIGHT EMER pushbutton on the forward attendant panel 120RH is pushed. The pushbutton contains an integral light.

 (3)
 The NO SMOKING switch 190RH on the overhead panel 25VU controls the relay 8WL in the relay box 103VU. The relay 8WL switches the exit signs on or off.

 **ON A/C 303-399,
 B. Cabin Emergency Lights
 (1) The cabin-emergency lights 20WL, 21WL, 32WL thru 37WL and 200WL thru 210WL consist of a housing, a lens and a number of LED connected in parallel.
 C. Exit Signs
 (1) The exit signs consist of a plastic case housing, a lens and a number of LED connected in parallel. There are different types:
 (a)
 The ceiling-mounted exit-location signs 50WL and 52WL, single-sided, one for the forward and one for the aft passenger/crew doors.

 (b)
 The ceiling-mounted exit-location signs 51WL, 53WL, 54WL and 55WL, single-sided, two for each pair of emergency exit doors.

 (c)
 The exit marking signs 40WL thru 47WL, single-sided, one for each passenger/crew door and one for each emergency exit door.

 D. External Lights
 (1) The escape slide lights are integrated in the escape slides and consist of a number of 6VDC lamps connected in parallel.
 E. Wall-Mounted Exit-Marking Signs
 (1) The wall-mounted exit-marking signs 90WL1 thru 90WL8, single sided, one for each passenger/crew door and one for each emergency exit door, contain an 6VDC inverter and a luminescent light.
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 F. System Control
 (1) The EMER EXIT LT switch 4WL on the overhead panel 25VU is a 3-position double-pole toggle switch. The positions are ON, OFF and ARM. It is used to switch the emergency lighting system on or off. The emergency lighting comes on automatically when the toggle switch is selected to ARM, if the battery busbar power fails. The toggle switch must be pulled to make a selection. This prevents accidental system selection.
 (2) The emergency lighting system comes on when the LIGHT EMER pushbutton switch on the forward attendant panel 120RH is pushed. The pushbutton switch contains an integral light.
 (3) The NO SMOKING switch 190RH on the overhead panel 25VU controls the relay 8WL in the relay box 103VU. The relay 8WL switches the exit signs on or off. 
R  **ON A/C 401-499, 
R  B. Cabin Emergency Lights 
R R R  (1) The cabin emergency lights 20WL, 21WL, 32WL, 33WL and 200WL thru 206WL consist of a housing, a lens and a number of LED connected in parallel. 
R  C. Exit Signs 
R R  (1) The exit signs consist of a plastic case housing, a lens and a number of LED connected in parallel. There are different types: 
　
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