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 (7) With the passenger/crew doors or the emergency exit doors open and the escape slides armed, independent of switch positions, the integral lights in the respective escape slides come on.
 **ON A/C ALL
 (8) With the essential busbar 401PP energized and the circuit breaker 79WL closed, a 28VDC auxiliary light comes on in each lavatory.

R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
 (9) In the event of excessive cabin depressurization, the exit marking signs, the exit location signs and the emergency-escape hatch-handle lights automatically come on.
 **ON A/C 301-399,
 (9) In the event of excessive cabin depressurization, the exit marking signs and the exit location signs automatically come on.
 **ON A/C ALL
 7. BITE TEST
_________
 **ON A/C 001-049, 051-099, 101-105, 151-199, 201-299,
 A. Emergency Lighting System An electronic test circuit energizes when the TEST EMER LIGHT SYS membrane switch on the programming and test panel 110RH (CIDS) is pushed. The test circuit supplies the ground for the emergency power-supply units control line TEST and, at the same time, the circuit for the SYS OK annunciator light.
 The emergency power-supply units 10WL thru 13WL start the following tests:
 -internal logic circuits,
 -battery charging and monitoring circuits,
 -28VDC power supply,
 -115VAC power supply,
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 -external loads and
 -internal loads.
 If there are no failures, the emergency power-supply unit completes the test signal loop. When the test loops of all emergency power-supply units are complete, the test circuit is complete and the SYS OK annunciator light comes on.

R **ON A/C 106-149, 301-399, 401-499,
 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:

 -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 pre-determined resistance values are used as reference values.
 The referenced values are stored in a memory of the EPSU electronic
 and monitoring circuits during a load programming (TEACH-IN)
 procedure. The procedure is accomplished as follows:

 -disconnect EPSU from 28 V DC aircraft power supply,

 -remove EPSU battery,

 -re-connect EPSU to 28 V DC aircraft power supply,

 -install EPSU battery.
 During the system test each EPSU measure the resistance values of its
 connected loads. These measured values are compared with the
 reference values.
 The system test has a limit of 60 seconds to prevent discharge of the
 battery pack.

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 **ON A/C 001-049, 051-099, 101-105, 151-199, 201-299,

 The test signal loop of the emergency power-supply unit is not complete if there is a defect found during the tests. If the test circuit is not complete, the SYS OK annunciator light does not come on. The display of the programming and test panel 110RH (CIDS) shows the messages:
 -
EPSU UNIT,

 -
EPSU BATTERY,

 -
EPSU 28 VDC,

 -
EPSU 115 VAC,

 -
EPSU EXT LOAD,

 -
EPSU INT LOAD.

 The EPSU UNIT message is shown when there is a failure in the internal logic circuits. The EPSU BATTERY message is shown when there is a failure in the battery charging and monitoring circuits. The EPSU 28 VDC or the EPSU 115 VAC messages are shown when there is a failure in the related power supply. The EPSU EXT LOAD or the EPSU INT LOAD messages are shown when there are failures in the external and the internal loads. A failure is found when the resistance values of these loads are not in their given limits. During the tests of the external and the internal loads and a load programming (TEACH-IN) procedure the emergency power-supply units switch on these loads. This tests and the TEACH-IN measure the resistance values of the loads. The TEACH-IN calculates the resistance limits of the loads and stores their values in the memories of the emergency power-supply units. Each emergency power-supply unit compares the measured values of the test with the stored limits of the TEACH-IN.
　
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