(c)
 The exit marking signs 40WL thru 45WL, single-sided, one for each passenger/crew door and one for each pair of emergency exits.

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 (2) The escape hatch-handle lights 70WL1 thru 70WL4 consist of a plastic case housing, a lens and two LED lamps connected in parallel. One escape hatch-handle light is installed in each emergency exit.
 D. External Lights
 (1)
 The overwing emergency lights 60WL thru 63WL consist of a housing, a lens and two 6VDC lamps connected in parallel.

 (2)
 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, contain an 6VDC inverter and a 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. 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.

 **ON A/C 151-158,
 B. Exit Lights
 (1) The exit signs consist of a plastic case housing, a lens and a number of 6VDC lamps 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.
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 (b)
 The ceiling-mounted exit-location signs 51WL and 53WL, single-sided, for the emergency exits.

 (c)
 The exit marking signs 40WL thru 45WL, single-sided, one for each passenger/crew door and one for each emergency exit.

 (2) The escape hatch-handle lights 70WL1 and 70WL2 consist of a plastic case housing, a lens and two 6VDC lamps connected in parallel. One escape hatch-handle light is installed in each emergency exit.
 C. Cabin Emergency Lights
 (1) The cabin emergency lights 20WL, 21WL, 32WL, 33WL and 200WL thru 206WL consist of a housing, a lens and two 6VDC lamps connected in parallel.
 D. External Lights
 (1)
 The overwing emergency lights 60WL thru 63WL consist of a housing, a lens and one 6VDC lamp.

 (2)
 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 a plastic case housing along the aisle.

 (2)
 The wall-mounted emergency exit-marking signs 90WL1 thru 90WL6, single sided, one for each passenger/crew door and one for each emergency exit, 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.

 (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.

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 (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 159-199,
 B. Exit Lights
 (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.
　
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