(f)
 Reed contact When the handset is not in its cradle, the reed contact connects electrical power to the handset.

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 Q. Cockpit handset
 (Ref. Fig. 025)

 (1)
 General The cockpit crew uses the handset for PA announcements and interphone communication.

 (2)
 Architecture
 The handset has these components:

 -'Push To Talk' button,
 -Microphone,
 -Earphone,
 -Reed contact,

 (3)
 Functions The functions of the different components are the same as those of the components of the cabin handsets.

 7. Operation/Control and Indicating
________________________________
 A. CIDS energization The CIDS is energized when the essential busbars or the service busbars are energized and the CIDS-related circuit breakers are closed.
 (1)
 Service busbars When the service busbars supply 28VDC to the CIDS, the system operates with full capability. The BITE test function is only active if the essential busbar is also available. To energize all CIDS components, the 601PP service busbar has to be energized. For the CIDS-SDF, the 204PP (Ref. 26-16-00) service busbar has to be energized.

 (2)
 Essential busbars The essential busbars supply power to the CIDS if the service busbars are not available. When only essential power is available, the system is in emergency mode and operates with the minimum functions. These functions are:

 -Passenger Address,

 -Cabin Interphone,

 -Smoke detection and indication (except cabin indications).

 -EVAC,
 To supply all CIDS components with essential electrical power the
 401PP essential busbar has to be energized.
 For the CIDS-SDF, the 801PP (Ref. 26-16-00) busbar has to be
 energized.

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 Cockpit handset
 Figure 025

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 (3) Power Supply To supply power to the CIDS components these circuit breakers have to be closed:
 (a)
 Director power

 -150RH DIR 1 ESS,
 -157RH DIR 2 ESS,
 -151RH DIR 1 NORM,
 -156RH DIR 2 NORM.

 (b)
 FAP power

 -171RH FAP 1 ESS,
 -170RH FAP 1 NORM.

R **ON A/C 106-149, 401-499,
 (c)
 DEUs type A power

 -158RH DEU A ESS FWD R,
 -159RH DEU A ESS FWD L,
 -172RH DEU A ESS AFT R,
 -179RH DEU A ESS AFT L,
 -163RH DEU A NORM L FWD,
 -164RH DEU A NORM R FWD,
 -167RH DEU A NORM L AFT,
 -168RH DEU A NORM R AFT.

 (d)
 DEUs type B power

 -153RH DEU B ESS,
 -162RH DEU B NORM.
 **ON A/C 301-399,
 (c) DEUs type A power
 -158RH DEU A ESS FWD R,
 -159RH DEU A ESS FWD L,
 -172RH DEU A ESS AFT R,
 -179RH DEU A ESS AFT L,
 -195RH DEU A ESS MID L,
 -196RH DEU A ESS MID R,
 -163RH DEU A NORM L FWD,
 -164RH DEU A NORM R FWD,
 -173RH DEU A NORM L AFT,
 -174RH DEU A NORM R AFT,
 -197RH DEU A NORM L MID,
 -198RH DEU A NORM R MID.
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 (d) DEUs type B power
 -153RH DEU B ESS,
 -193RH DEU B NORM FWD,
 -194RH DEU B NORM AFT. R **ON A/C 106-149, 301-399, 401-499,
 B. Handling of Flight Attendant Panel (FAP)
 (1) General R **ON A/C 106-149, 401-499,
 (Ref. Fig. 026)
 **ON A/C 301-399,

 (Ref. Fig. 027) R **ON A/C 106-149, 301-399, 401-499,
 The FAP is divided into two main areas, the touchscreen and the sub panel.
 (a) Touchscreen
 The touchscreen has these components:

 -
a Heading row,

 -
a Display area,

 -System and function keys,
 1 Heading row

_ The heading row shows the title of every selected page.
 2 Display area
_ The display area shows every selected page.
 3 System and function keys
_ The system and function keys are used to select system pages.
 (b) Sub panel The sub panel is used for major functions operate independently from the FAP touchscreen.
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