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Oct 31/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
UF94200
EFFECTIVITY Page 61
ALL
AFS MAINTENANCE SYSTEM
GENERAL
The Auto Flight System (AFS) is a type 1 system, able
to maintain a two-way communication with the
Centralized Fault Display Interface Unit (CFDIU).
The line maintenance of the AFS is based on the use
of the Fault Isolation and Detection System (FIDS)
active in the FAC 1 and of the Built In Test Equipment
(BITEs) located in the various AFS computers.
Access to the fault data is made through the MCDUs via
the CFDIU.
Like for other systems, the CFDIU works in NORMAL mode
and MENU mode (See ATA 31-CFDS).
FIDS
The FIDS is a card physically located in each FAC.
Both FACs are interchangeable, but only the FAC 1 FIDS
is active due to the side 1 signal.
The FIDS is used as a system BITE to concentrate
maintenance information.
The FIDS is linked in acquisition and reception to the
CFDIU and is connected to the BITEs of the various AFS
computers.It receives commands from the CFDIU,
interprets these commands and transfers them, if
applicable, to the various BITEs concerned.
It receives malfunction reports from the BITEs, manages
these reports, and, if applicable, consolidates the
BITE diagnosis (Occurence, correlation,...) and
generates a fault message which is sent to the CFDIU.
NOTE: If the FIDS fails, the BITEs continue to work
and the results can be read in the shop or after
FAC 1 change.
The NORMAL mode function is the same as in other
systems.
In addition to the usual system report functions, the
MENU mode enables access to GROUND SCAN, AFS TEST and
LAND TEST.
TMUFACK01-T01 LEVEL 1
EFFECTIVITY 22-00-00 Page 2
Oct 31/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
UF94200
EFFECTIVITY Page 62
ALL
AFS MAINTENANCE SYSTEM - GENERAL & FIDS
TMUFACK01-P01 LEVEL 1
EFFECTIVITY 22-00-00 Page 3
Oct 31/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
UF94200
EFFECTIVITY Page 63
ALL
AFS MAINTENANCE SYSTEM
BITEs
According to its internal architecture, each AFS Line
Replaceable Unit has one or several BITEs.
The basic purpose of a BITE is to detect, isolate,
memorize failures (FCU and MCDU BITEs only perform the
detection task).
The failure detection is triggered by specific events
listed in the maintenance manual.
Example of FG CMD triggering event: ILS own fail.
The failure localization corresponds to an analysis
processed to identify the origin of the failure.
FAC/FM/FG BITE
As the FAC and FG have a BITE in the command (CMD) and
the monitor (MON) sides, the fault analysis is
generally made in each side and a synthesis is made
in the command side.
Each BITE memorizes the result of the analysis, the
failure context, the flight leg number, the time and
date of each given failure.
Then the BITE sends the result of the analysis, with
a maximum of two suspected Line Replaceable Units in
order of probability, to the FIDS.
FCU BITE
Each FCU BITE computes the maintenance status of its
related part and permanently sends this maintenance
data to the FG command part.
TMUFACK01-T02 LEVEL 1
EFFECTIVITY 22-00-00 Page 4
Oct 31/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
UF94200
EFFECTIVITY Page 64
ALL
AFS MAINTENANCE SYSTEM - BITEs, FAC/FM/FG BITE & FCU BITE
TMUFACK01-P02 LEVEL 1
EFFECTIVITY 22-00-00 Page 5
Oct 31/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
UF94200
EFFECTIVITY Page 65
ALL
AFS MAINTENANCE SYSTEM
MCDU BITE
The MCDU performs tests on its processor, memory and
display unit.
If a failure is found by the MCDU BITE:
- the FAIL annunciator comes on and the display
is blank,
- the MCDU FAIL output discrete is set and
sent to FG 1 and FG 2 command parts.
TMUFACK01-T03 LEVEL 1
EFFECTIVITY 22-00-00 Page 6
Oct 31/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
UF94200
EFFECTIVITY Page 66
ALL
AFS MAINTENANCE SYSTEM - MCDU BITE
TMUFACK01-P03 LEVEL 1
EFFECTIVITY 22-00-00 Page 7
Oct 31/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
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ATA 22 AUTO FLIGHT SYSTEM(14)
