R R R  D. Integrated Escape Slide Lights The escape slide lights are integrated in the escape slides. They come on when the escape slides are deployed. 
R  **ON A/C 051-099, 210-228, 301-399, 
R  Post SB  33-1041 For A/C 051-099,
 A. Emergency Power Supply Units (EPSU) The EPSUs control and monitor the emergency lighting system. They are installed in the ceiling of the passenger compartment.
 B. Cabin Emergency Lights The ceiling emergency lights are installed to give sufficient illumination in an emergency condition. The lights are installed in the ceiling panels of the aisles, cross-aisles and exit areas. The exit marking signs are installed to show the position of the exits. The lights are installed near each passenger/crew door and emergency exit. The exit location signs are installed to show the position of the exit areas. The lights are installed in the aisles.
 C. FPEEPMS The FPEEPMS is installed on the floor or on the seats (as applicable) at the aisle and the emergency-exit area. The system provides floor-level illumination of the passenger aisles and escape routes in the event that smoke obscures normal emergency lighting.
 D. Integrated Escape Slide Lights The escape slide lights are integrated in the escape slides. They come on when the escape slides are deployed.
 **ON A/C ALL
 3. System Description__________________
 A. General The cabin emergency-lighting system is supplied with power, when the AC normal busbar and the DC essential busbar are energized and the circuit breakers are closed. You can control the cabin emergency-lighting system with the control switch EMER EXIT LT, installed in the cockpit. The pushbutton EMERG ON, installed on the FAP, is connected in parallel to the control switch EMER EXIT LT. The control switch EMER EXIT LT 4 WL has these three positions: - OFF - ARM

 -ON Each of the set positions cause the cabin emergency-lighting system to operate in a different way.
 (1)
 OFF Position
 The cabin emergency lighting system is disarmed.

 (2)
 ARM Position The cabin emergency lighting system is set to the Automatic Mode. All cabin emergency lights are off as long as no failure in the aircraft power supply system occurs.

 (3)
 ON Position The cabin emergency lighting system is activated; all cabin emergency lights are on. The lights are supplied by the DC essential busbar or, in case of a DC essential busbar failure, by the EPSU batteries.

 4.
 Power Supply

____________ The emergency lighting system is supplied with 115 V AC from the normal busbar 103XP-B and with 28 V DC from the essential busbar 801PP. The circuit breakers 1WL and 2WL are installed on the circuit breaker panel 49VU. The circuit breaker 3WL is installed on circuit breaker panel 122VU. When the DC essential aircraft power supply is not available, the integrated batteries of the EPSUs supply the cabin emergency lighting system. They can supply the system for a least 10 minutes.

 5.
 BITE Test

_________

R **ON A/C 001-049, 051-099, 101-105, 151-199, 201-299,
 A. General
 Each EPSU has two different integrated BITE functions:

 -
A system test

 -
A battery capacity test The EPSUs have an interface to the CIDS to read the BITE results of a system test and a battery capacity test.

 (1) System Test
 The system test monitors the subsequent functions:

 -
The aircraft AC power supply

 -
The aircraft DC power supply

 -A short circuit on each output
 -An overvoltage on each output
 -
The output voltage of the battery pack

 -
The battery heating device

 -
The proper function of the EPSU logic and switching circuits

 -If the connected loads are in the pre-determined values

 The system test has a limit of 20 seconds to prevent discharge of the

 battery pack.
 (2) Battery Capacity Test
 The battery capacity test monitors:

 -
If the capacity of each EPSU battery is sufficient enough to supply its emergency lights for at least 10 minutes

 -
If the loss of the capacity of each battery, between two

 consecutive battery capacity tests, is smaller than 0.40 Ah It can take up to three hours to complete the battery capacity test.

R **ON A/C 106-149, 301-399, 401-499,
 A. General
 Each EPSU has two different integrated BITE functions:

 -
A system test

 -
　
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