-
the position of the flap surfaces
-
the direction and limit of the flap surface movement
-
when the flap locking function is engaged
-
when the flap auto-command function is engaged
-
when a system failure has occurred.
R **ON A/C ALL
4. Power Supply____________
(Ref. Fig. 003)
The 431XP ESS BUS and the 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. 27-51-00).
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 flaps move, the upper 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 flap position by green triangles
-
the new flap position by blue triangles.
When the flaps 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 flap position go out of view.
If the flaps do not move freely, the FLAP indication changes from cyan to amber.
A. Flap Protection
(1) Flap Lock
If the Wing Tip Brakes (WTB) lock the flap transmission system (e.g. in an asymmetry condition (Ref. 27-51-00)):
-
the white F indication changes to amber
-
the flap index changes to amber
-an amber F-LOCKED message comes on above the set position indication.
(2) System Failure
If the SFCCs send a failure message to the EIS, or the System Data Acquisition Concentrators (SDAC1, SDAC2) (Ref. 31-54-00) send a SFCC failure message:
-
the white F indication changes to amber
-
the green flap index changes to amber.
B. No Data at the Data Management Computer (DMC) Input
(1) No Position Data
When no valid position data is available for the flaps at the DMC input:
-the green index of the flap system goes out
-two amber crosses come on at the flap side of the display
-
the cyan lever position indication comes on
-
the cyan dot which indicates the lever configuration comes on.
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