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Mon, Nov 01, 2010

AD: Airbus

AD NUMBER: 2010-22-06

MANUFACTURER: Airbus Model A330-201, -202, -203, - 223, and -243 Airplanes, and Model A330-300 Series Airplanes
SUBJECT: Airworthiness Directive 2010-2206

SUMMARY: This AD results from mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as:

An A330 experienced an uncommanded engine 1 in flight spool down, which occurred while applying fuel gravity feed procedure, in response to low pressure indications from all fuel boost pumps, in both left and right wings.

The investigations revealed that the wing tank pressure switches P/N (part number) HTE69000-1 had frozen due to water accumulated in their external part, causing spurious low pressure indications.

As per procedure, the main pumps are then switched off, increasing the level of unavailable fuel. This, in combination with very low fuel quantities or another independent trapped fuel failure scenarios, can lead to fuel starvation on the affected engine(s).

FMI: http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgAD.nsf/0/61D26B9DA4DB05EE862577CB004E7B3E?OpenDocument

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