AD Number:
AD/A320/174 Air Data/Inertial Reference Unit 6/2005 DM
Applicability: Model A318, A319, A320 and A321 series
aeroplanes equipped with at least one Northrop-Grumman (previously
Litton) Air Data/Inertial Reference Unit (ADIRU) (AIRBUS
modification 24852 or 25108 or 25336 or 26002 or 28218). Requirement: Operational dispatch of the aircraft
with one ADIRU inoperative will be authorized under the following
conditions:
Stand-by compass operative
Stand-by attitude indicator operative.
For aircraft equipped with conventional standard instruments,
compliance with A318/319/320/321 Master Minimum Equipment List
(MMEL) Temporary Revision (TR) No 01-34/02Z issue 02 is an
acceptable means of compliance with this Directive. For aircraft
equipped with Integrated Standby Instruments System (ISIS) (AIRBUS
modification 27620/ AIRBUS Service Bulletin A320-34-1261),
compliance with A318/319/320/321 MMEL TR No 01-34/07Z issue 01 is
an acceptable means of compliance with this Directive.
Note: DGAC AD F-2005-029 R1 (EASA approval 2005-2242) refers.
Compliance: Before 11 May 2005.
This Airworthiness Directive becomes effective on 4 May 2005.
Background: The French Direction Generale de
l’Aviation Civile (DGAC) advised that some instances of loss
of inertial references have been reported which could reduce the
control of the aircraft due to the non-availability of some
parameters (attitude, vertical speed, ground speed,…).
Subsequent investigation identified the loss of the parameters as
being caused by the ADIRU striking the bottom of the upper shelf.
AD/A320/138 mandated the modification of the ADIRU shelf supports
in an attempt to prevent contact between the ADIRUs and the upper
shelf. These measures have not proved sufficient. This Directive
introduces revised despatch limitations for the MMEL.
Dave Juwel's Aviation Marketing Stories ITBOA BNITBOB ... what does that mean? It's not gibberish, it's a lengthy acronym for "In The Business Of Aviation ... But Not In The Busine>[...]
The Pilot Attempted Several Times To Restart The Engine And Diverted To Long Beach Airport/Daughtery Field On October 20, 2025, about 1603 Pacific daylight time, an experimental am>[...]
Hazardous Weather Information Summary of significant meteorological information (SIGMET/WS), convective significant meteorological information (convective SIGMET/WST), urgent pilot>[...]
"The latest development underscores the government of Malaysia’s commitment in providing closure to the families affected by this tragedy..." Source: From statements made by >[...]
Also: IAE Acquires Diamond Trainers, Army Drones, FedEx Pilots Warning, DA62 MPP To Dresden Tech Uni The danger to the flight training industry and our future pilots is clear. Dona>[...]
Aero-FAQ: Dave Juwel's Aviation Marketing Stories -- ITBOA BNITBOB
See All