R **ON A/C ALL

 4. Power Supply____________
 (Ref. Fig. 003)
 431XP ESS BUS and 231XP BUS 2 supply 26V AC:
 -431XP ESS BUS supplies circuit breaker 1CN
 -231XP BUS 2 supplies circuit breaker 2CN
 -1CN supplies 26V AC to IPPU connector A
 -2CN supplies 26V AC to IPPU connector B.
 5. Interface_________
 Not Applicable
 6. Component Description_____________________
 A. Instrumentation Position Pickoff-Unit (IPPU)
 The IPPU has:
 -
a splined input shaft

 -
a spring-loaded locking plate

 -reduction gears
 -a reduction gear housing
 -two synchro transmitters which operate independently
 -a synchro cover
 -an electrical connector assembly
 -a cover plate.
 When the IPPU is removed, the spring-loaded locking plate holds the splined input shaft from the removed IPPU. When the IPPU is installed, the mount of the IPPU pushes the locking plate away from the shaft splines. The input shaft moves the reduction gears which are in the reduction gear housing. The reduction gears turn the two synchro transmitters which are below the synchro cover.
 The electrical connector assembly is installed on the reduction gear housing. The electrical connector assembly has two connectors, one for each synchro transmitter. The connectors are identified as A and B. The cover plate is installed over an opening in the reduction gear housing. There is a window in the cover plate to monitor adjustment of the IPPU to zero.
 The IPPU is the same as the Feedback Position Pick-Off Unit (FPPU) and a full description is given in (Ref. 27-81-00).

 Slat Position Indicating - Schematic Figure 003
 1EFF : 1 1R 1CES  ALL  1 11 1 27-85-00 Page 7 Feb 01/05

 7. Operation/Control and Indicating
________________________________
 **ON A/C 001-049, 051-099, 101-105, 151-199, 201-299, 301-302,
 (Ref. Fig. 002)

R **ON A/C 106-149, 303-399, 401-499,
 (Ref. Fig. 002A)
 **ON A/C ALL
 (Ref. Fig. 003)
 **ON A/C 001-049, 051-099, 101-105, 151-199, 201-299, 301-302,
 When the slats move, the upper ECAM display unit (Ref. 31-66-00) shows:
 -
the FLAP indication in cyan

 -
the position indication of the flap and slat control lever as 0, 1 (1 + F when the flap auto-command function is engaged), 2, 3 or FULL in cyan

 -
the correct slat position by green triangles

 -
the new slat position by blue triangles.

 When the slats reach their new position:

 -
the FLAP indication changes from cyan to white.

 -
the position indication of the flap and slat control lever changes from cyan to green.

 -
the blue triangles of the slat position go out of view.

 If the slats/flaps do not move freely, the FLAP indication changes from cyan to amber.
 A. Slat Protection
 (1) Slat Lock
 If the Wing Tip Brakes (WTB) lock the slat transmission systems (for example in an asymmetry condition (Ref. 27-81-00)):
 -
the white S indication changes to amber

 -
the slat index changes to amber

 -an amber S-LOCKED message comes on above the set position indication.

 (2) Alpha-Lock/Speed Baulk
 The Alpha-Lock/Speed Baulk function prevents the retraction of the slats when the aircraft is operating outside specified flight parameters (Ref. 27-81-00). If the flap and slat position lever is moved to the 0 position and the function operates (for example if the Corrected Angle of Attack (CAoA) is too large or the Computed Air Speed (CAS) is too low):
 -
the flap index stays green and moves to the retracted position if it is not already in this position

 -
the cyan selected position point on the flap side of the wing display goes off if it is on

 -
the green slat index stays at position 1 and flashes, the cyan position selected point stays on

 -
the cyan 0 set position indication under the grey wing center-section stays on

 -a green flashing A-LOCK message comes on at the slat side of the indication.
 (3) System Failure
 If the SFCCs send a failure message to the EIS, or the System Data Acquisition Concentrators (SDAC1 and SDAC2) (Ref. 31-54-00) send a SFCC failure message:
 -
the white S indication changes to amber

 -
the green slat index changes to amber.

 B. No Data at the Data Management Computer (DMC) Input
 (1) No Position Data
 When no valid positional data is available for the slats at the DMC input:
　
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