AD/B767/243 Engine Indication and Crew Alerting System (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.

Boeing 767 Series Aeroplanes

AD/B767/243 Engine Indication and Crew Alerting System 8/2008 DM

Applicability:

All Model 767-200, 767-300 and 767-300F series aeroplanes.

Requirement:

Revise the Limitations Section of the applicable Aircraft Flight Manual (AFM) to include the following statement.  This may be accomplished done by inserting a copy of this Directive into the AFM.

If the STATUS cue shows while on the ground after engine start or during flight, select the status page on the secondary EICAS display, and verify the "L ENG FUEL FILT'' message is not shown.  If the "L ENG FUEL FILT'' message is not shown on the status page, the secondary engine parameters may be reselected on the secondary EICAS display, or the display may be blanked.  If the "L ENG FUEL FILT'' message is shown on the status display, accomplish the ENGINE FUEL FILTER non-normal checklist as published in the Boeing Quick Reference Handbook.  If on the ground, check the Dispatch Deviations Guide (DDG), or operator equivalent.

In the event that the status level "L ENG FUEL FILT'' and advisory level "R ENG FUEL FILT'' messages are simultaneously shown, an impending fuel filter bypass condition exists on both engines.  With both messages shown, aeroplane fuel system contamination may be present and may result in erratic engine operation or flameout.

Further flight crew action in response to either or both the "L ENG FUEL FILT'' status-level message and the "R ENG FUEL FILT'' advisory level messages being shown are not established by Boeing or the FAA.  Any further flight crew action should be determined by individual operator policy.

Boeing policy on flight crew use of status-level messages has not changed. After engine start, any condition having an adverse effect on safe continuation of the flight appears as an EICAS alert message (Warning, Caution, or Advisory).  If other status-level messages are shown as a consequence of complying with these temporary operating instructions, the flight crew should respond in accordance with the appropriate operator policy.

Dispatch of the aeroplane with an inoperative EICAS display unit is prohibited.

If all affected aeroplanes in an operator's fleet have been verified by the operator to have EICAS computer part number S242N701-1001 and only engine indication and crew alerting system (EICAS) operating program software (OPS) versions other than Version 6 software that are FAA approved for that aeroplane, then accomplishment of the AFM revision is not required.

Note:  FAA AD 2008-09-07 Amdt 39-15488 refers.

Compliance:

Within 30 days after the effective date of this Directive.

This Airworthiness Directive becomes effective on 20 June 2008.

Background:

This Directive was prompted by an error in the EICAS OPS.  The error prevents the display of an advisory message to the flight crew of a left engine fuel filter contamination and imminent bypass condition, which may indicate an imminent multiple engine thrust loss or engine malfunction event due to fuel contamination.

The Directive is issued to prevent malfunction and thrust loss on both engines, which could result in a forced off- airport landing.

James Coyne
Delegate of the Civil Aviation Safety Authority

13 June 2008