Commonwealth legislation

AD/ERJ-190/4 - Inertial Reference Unit and Primary Flight Displays

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Commonwealth

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legislative instrument

Plain English Summary

3/10 complexity

This directive requires operators of all Embraer ERJ‑190 aeroplanes to remove wiring connections from pins 51 and 52 on both inertial reference units, following Embraer Service Bulletin 190‑34‑0009 (or later ANAC‑approved revision), to stop erroneous flight‑path‑angle displays. The modification must be done before 27 February 2009. The cost, labour and downtime fall to aircraft operators, and compliance depends on following the service bulletin and any ANAC‑approved revisions (Applicability; Requirement; Compliance).

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Current sections

Direct links to the current provisions in AD/ERJ-190/4 - Inertial Reference Unit and Primary Flight Displays.

Embraer ERJ-190 Series Aeroplanes

AD/ERJ-190/4	Inertial Reference Unit andPrimary Flight Displays	5/2008

Applicability:	All ERJ-190 aircraft models.
Requirement:	If not previously accomplished, remove the wiring connections from pins 51 and 52 in the electrical connectors of both Inertial Reference Units (IRU) in accordance with the procedures in Embraer Service Bulletin 190-34-0009 original issue dated 26 February 2007, or later revision approved by the Brazilian Agência Nacional de Aviação Civil (ANAC).
	Note: ANAC AD 2007-08-04 refers.
Compliance:	Before 27 February 2009.
	This Airworthiness Directive becomes effective on 8 May 2008.
Background:	The ANAC has advised of reports of IRU failures which lead to an erroneous flight path angle (FPA) indication on both primary flight displays, with no alert to this condition to the crew. On ERJ-190 aircraft, FPA is considered as important as pitch and bank angle for piloting purposes.
	Since this condition affects flight safety, this Directive requires wiring changes which will improve IRU functionality.

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David Punshon
Delegate of the Civil Aviation Safety Authority

13 March 2008

AD/ERJ-190/4

Inertial Reference Unit andPrimary Fligh

Inertial Reference Unit andPrimary Flight Displays

Inertial Reference Unit and

Primary Flight Displays

5/2008

Source text

Sourced from the Federal Register of Legislation (legislation.gov.au), CC BY 4.0.

Embraer ERJ-190 Series Aeroplanes Embraer ERJ-190 Series Aeroplanes

Embraer ERJ-190 Series Aeroplanes

AD/ERJ-190/4	Inertial Reference Unit andPrimary Flight Displays	5/2008

Applicability:	All ERJ-190 aircraft models.
Requirement:	If not previously accomplished, remove the wiring connections from pins 51 and 52 in the electrical connectors of both Inertial Reference Units (IRU) in accordance with the procedures in Embraer Service Bulletin 190-34-0009 original issue dated 26 February 2007, or later revision approved by the Brazilian Agência Nacional de Aviação Civil (ANAC).
	Note: ANAC AD 2007-08-04 refers.
Compliance:	Before 27 February 2009.
	This Airworthiness Directive becomes effective on 8 May 2008.
Background:	The ANAC has advised of reports of IRU failures which lead to an erroneous flight path angle (FPA) indication on both primary flight displays, with no alert to this condition to the crew. On ERJ-190 aircraft, FPA is considered as important as pitch and bank angle for piloting purposes.
	Since this condition affects flight safety, this Directive requires wiring changes which will improve IRU functionality.

David Punshon
Delegate of the Civil Aviation Safety Authority

13 March 2008

AD/ERJ-190/4 AD/ERJ-190/4

AD/ERJ-190/4

Inertial Reference Unit andPrimary Fligh Inertial Reference Unit andPrimary Flight Displays

Inertial Reference Unit and

Primary Flight Displays

Deep dive

Current sections

Embraer ERJ-190 Series Aeroplanes

Embraer ERJ-190 Series Aeroplanes

AD/ERJ-190/4

AD/ERJ-190/4

Inertial Reference Unit andPrimary Flight Displays

Inertial Reference Unit and

5/2008

5/2008

Source text

Embraer ERJ-190 Series Aeroplanes Embraer ERJ-190 Series Aeroplanes

Embraer ERJ-190 Series Aeroplanes

AD/ERJ-190/4 AD/ERJ-190/4

AD/ERJ-190/4

Inertial Reference Unit andPrimary Fligh Inertial Reference Unit andPrimary Flight Displays

Inertial Reference Unit and

5/2008 5/2008

5/2008