AD/ERJ-190/15 Low Pressure Check Valves (Cth)

AIRWORTHINESS DIRECTIVE

For the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.001(1) of CASR 1998.  The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.

Embraer ERJ-190 Series Aeroplanes

AD/ERJ-190/15 Low Pressure Check Valves 9/2008

Applicability:

Embraer ERJ-190 aircraft fitted with low pressure check valves (LPCV) Hamilton Sundstrand part number (P/N) 1001447-3.

Requirement:

1.    Replace the LPCV P/N 1001447-3 by a new one of same P/N.

2.    Repeat the replacement of the LPCV P/N 1001447-3 as detailed in Requirement 1 of this AD.

3.    Do not install any LPCV P/N 1001447-3 that has accumulated more than 1500 FH on models ERJ-190, or that have accumulated a total of FH equivalent to 1500FH considering its utilization on models ERJ-170 and ERJ-190.

To calculate the equivalent number of FH for a LPCV P/N 1001447-3 to be installed on aircraft models ERJ-190, the FH accumulated in operation on aircraft models ERJ-170 must be multiplied by a factor of 0.5 (50%).

4.    Revise the approved maintenance plan to include the maintenance task No.
36-11-02-002 (Functional Check - Low Stage Bleed Check Valve, Category 8), according to the Maintenance Review Board Report (MRBR) Revision 4 dated 31 May 2007, with the intervals established in that document, or later revisions approved by ANAC.

Terminating Action

Replacement of LPCV P/N 1001447-3 by a new LPCV bearing P/N 1001447-4 is considered a terminating action for the repetitive replacements required by this AD.

The detailed instructions and procedures to accomplish this AD are detailed in Embraer Service Bulletins Nos. 190-36-0004 original issue, or 190-36-0006 original issue, as applicable or respective further revisions approved by the ANAC.

Note:  AGÊNCIA NACIONAL DE AVIAÇÃO CIVIL – BRAZIL AD 2006-11-01R2 refers.

Compliance:

For Requirement 1 - Within 100 Flight Hours (FH) after the effective date of this AD, on aircraft logging 1500 FH or above, unless previously accomplished.

For Requirement 2 - At intervals not to exceed 1500 FH.

For Requirement 3 - After the effective date of this AD.

For Requirement 4 - Within the next 180 days after the accomplishment of the Terminating action above, or before any LPCV P/N 1001447-4 installed reaches 1500 FH, whichever occurs first.

This Airworthiness Directive becomes effective on 28 August 2008.

Background:

There has been an occurrence of an engine in-flight shutdown caused by the LPCV failing to close due to excessive wear.  Due to the fact that such a fault could occur on both engines of the same aircraft the actions detailed in this AD are intended to prevent a dual engine in-flight shut-down.

James Coyne
Delegate of the Civil Aviation Safety Authority

17 July 2008