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segments AA, AB, AD and AE. This meant that in a most confined space approx. 420 assigned
connector pins had to be reconnected. As this repair work would take a longer period of time, the
aeroplane was taken out of flight operations.
BFU German Federal Bureau of Aircraft Accidents Investigation
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The work started without having a Maintenance Job Order which would have been required according
to respective procedural regulations.
Location of the ELAC no. 1 in the Avionic Bay
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Rear of the plug with its four segments
It was decided to apply the “ONE TO ONE“ method, i.e. the wires were disconnected one after the
other from the old plug and immediately connected to the new one. The work started on
19.03.2001 in the morning shift with the replacement of the plug segments AA, AD und AE. The
fourth plug segment AB was replaced in the subsequent late shift. The work was accomplished by
adequately qualified aircraft electronic technicians with company internal ratings, so-called B1 and
B2 qualifications.
The designation of the positions of the individual pins on the plug segments was defined by an alphanumerical
coordinate system. The working basis was the "AIRCRAFT WIRING LIST" (AWL)
91-20-33 and the "AIRCRAFT WIRING MANUAL" (AWM) 27-92-19.
The staff members were not sure which page of the AIRCRAFT WIRING MANUAL was the effective
one, as there were two pages which could be applicable for the aeroplane concerned and
which could only be assigned on the basis of the accomplished SERVICE BULLETINS (SB).
In addition to the serial numbers the aeroplanes are distinguished by the status of their equipment
with the validity of the documents for the individual aeroplanes being shown by a consecutive numbering
in conjunction with the term "EFFECTIVITY".
Page 2 of the AWM 27-92-19, Feb. 01/91 shows an effectivity range of 013 up to 018 (bottom left).
The designation POST SB001012 below the effectivity range 013018 on the bottom left means that
this WD applies only to aeroplanes whose effectivity is within the range of 001 to 012, if the SB27-
BFU German Federal Bureau of Aircraft Accidents Investigation
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1030 has been accomplished; the accomplishment being indicated on the bottom right. The aeroplane
concerned had the effectivity 017 and the SB 27-1030 had not been accomplished, therefore
page 2 was applicable.
This page is applicable to all aeroplanes with an effectivity range of 013 to 018 and 001 to 012,
provided on the latter the SB27-1030 has been accomplished.
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This page is applicable among other things to aeroplanes within an effectivity range POST SB
from 001 to 034, provided the SBs listed on the right-hand side have been accomplished.
Page 4 shows the effectivity range from 001 to 034 following the desgination POST SB, this means
that this range applies only to aeroplanes on which the SBs indicated on this page on the bottom
right have been accomplished. Although the aeroplane concerned was within this range, only the
SB27-1084 had been accomplished, but not the SB27-1030, thus the page was not applcable to
this aeroplane. Erroneously the mechanics thought page 4 to be applicable as the SB 27-1084 had
been accomplished on this aeroplane.
On this aeroplane there was a further particuliarity concerning the wiring between the sidestick plug
and the ELAC. All pairs of wires consist of a red and a blue wire which are twisted round each
other. As can be seen from the AWL the twisted pairs are always assigned in an alphanumerical
sequence of the plug segment coordinates in the order red / blue, except for the twisted pairs 0603
and 0597 which were - opposite to the normal arrangement - assigned to the pins 3C/3D and
15J/15K in the sequence blue / red.
According to an information given by the manufacturer in response to an inquiry, Airbus Industry
intend to achieve a uniform wiring for all “fly by wire“ aeroplanes. From a certain type series,on the
wiring of the A 320 series was planned to be identical with the wiring of the A 330 and A 340 aeroplanes,
an interchange of colours was accepted for a certain transition period. The aeroplane concerned
belonged to the transition series as could be seen from the Aircraft Wiring List.
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This AWL shows the standard assignment of the pins 3C/3D on the plug segment AA in the area with
the dark background. This assignment is applicable to most aeroplanes of the fleet except for the
aeroplanes with an effectivity range from 001 to 018, which would have applied also to the aeroplane
　
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