ALL OPERATORS’ WIRE
Date: 21 May 2010
To: GE Aviation Customers
Subject: Operations in European Volcanic Ash Advisory Area
In response to the exceptional operational circumstances being experienced due to volcanic ash, the CAA has continued discussions with regulators, airframe and engine manufacturers, operators, research centers, air traffic control service providers and meteorological agencies with a view to further refining the airworthiness safeguards applicable to operations in affected airspace.
The purpose of this All Operators Wire is to reinforce recommendations for GE engine operations in predicted volcanic ash concentration zones. This communication is in addition to the most recent revisions of GE All Operators Wires:
CT7-2-2010-02(Issued May 18, 2010)
CT7-6-2010-02(Issued May 18, 2010)
1. Visual management in terms of ash cloud encounter avoidance remains the prime means to ensure continued safe operation. Visible ash cloud is usually defined as 2x10-3 g/m3. The aviation industry has a good safety record of dealing with the volcanic ash hazard by avoiding visible ash.
2. In order to ensure that flight in visual ash conditions is avoided, maximum use will be made of in-flight pilot reports (PIREPs) to aid in the dissemination of information about suspected ash locations and vertical extent.
3. To date, there have been no reported borescope inspection findings of engine distress related to volcanic ash from Iceland since April 2010.
4. The UK MET model predicted densities appears to be conservative based on flight test sampling and operator experience.
5. Flight into UK Met model predicted densities higher than 2x10-3 g/m3 may be undertaken at operator’s discretion provided flight into visible ash clouds is avoided; however, GE recommends the operator visually inspect the engine inlet and exhaust areas for unusual damage or evidence of volcanic ash. Report findings of unusual damage or evidence of volcanic ash to GE and follow applicable service documents for continued operation.
6. Operators need to monitor the position of the visible ash cloud and forecast movement to allow night/IMC operations.
If you have any questions, please contact your Field Service Representative, Project Engineer or Product Support Engineer.
Marc Joslow John Hassett
Director, Product Support Director, Project Engineering
Turboshaft Turboprop Department Lynn Turbofan / Turboject Dept.
Phone : +1-781 594-1259 Phone : +1-781 594-3379
Email : [email protected] Email : [email protected]