Airbridge Cargo B748 near Hong Kong on Jul 31st 2013, both left hand engines surged at same time, one right hand engine damaged too
Last Update: November 27, 2013 / 16:59:07 GMT/Zulu time
Rosaviatsia reported on Aug 6th 2013 that the aircraft entered a zone of dramatic temperature fluctuations, the temperature changing between -53 and -33 degrees C, when the engines surged, #2 spontaneously shut down and auto-started again without crew intervention. Both engines received damage to high pressure compressor blades.
In a safety message to operators released on Aug 20th 2013 Rosaviatsia rated the occurrence a "very serious incident" reporting that engines 1,2 and 4 were affected. Ice accumulated on unheated parts of the high pressure compressor in unpredictable and poorly understood meteorological conditions leading to the disruption of air flow inside the engine causing surges of the left hand engines. The flight was continued to destination, a post flight examination showed "unacceptable damage" to the high pressure compressor blades of engines 1,2 and 4 (both left and outboard right hand engine). Rosaviatsia is investigating the occurrence together with Boeing and General Electric, the FAA and EASA have been notified about this very serious incident.
On Nov 25th 2013 Boeing confirmed that a Multi-Operator-Message (MOM) has been sent to B747-8 and B787-800 customers, "who operate some GE-powered engines after instances of ice crystal icing that resulted in temporary diminished engine performance. To reduce chances of ice crystal conditions, Boeing also updated its Airplane Flight Manual (AFM) to prohibit flight within 50 nautical miles of large convective weather systems that may contain ice crystals. Boeing is working with its customers and GE to address the icing issue. Only a small number of GEnx engines have experienced the ice crystal icing issue in flight. GE will introduce the improvements necessary to return the engine to expected performance levels. Boeing is disappointed in any impact this situation may have on our customers, as is the GE team. We, like our customers, expect the delivered product to meet all expectations and will work closely with GE to address the subject condition. We regret the business disruption this will cause for our customer and remain ready to provide whatever assistance we can to Japan Airlines."
On Nov 27th 2013 the FAA released Airwirthiness Directive AD-2013-24-01 requiring operators of Boeing 747-8, Boeing 747-8F and Boeing 787-8 aircraft powered by GEnx engines to "revising the airplane flight manual to advise the flight crew of potential ice crystal icing (ICI) conditions at high altitudes, and to prohibit operation in moderate and severe ICI conditions. This AD also requires inspecting the engine after any ICI event is detected by the flight crew." The FAA argues that there had been reports of engine damage and loss of thrust in Ice Crystal Icing (ICI) conditions while flying at high altitudes. This type of icing does not appear on weather radar and thus often remains undetected by flight crew. Flying in these conditions leads to accumulation of ice crystals in the core gas flow of the engine. In events leading to prior airworthiness directives the ice had shed during throttle transients and in the descent phase of flight causing temporary loss of thrust, now newer events have occurred at cruise altitudes at or above FL330 while flying through a mesoscale convective system (continuous cloud larger than 100km/62 nm across). The AD reports that nine events have occurred leading to this AD, in two events two engines on Boeing 747-8 freighters experienced thrust losses, in one event both engines recovered, in the other event one engine remained at idle thrust for the remainder of the flight. In both events the two engines experienced thrust loss showed damage as well as a third engine that did not suffer a loss of thrust. On 4 events uncommanded engine decelerations occurred for about 20 seconds, in three other events on 787-8 aircraft at least one engine showed increased vibration levels until exiting the weather system.
This article is published under license from Avherald.com. © of text by Avherald.com.
Read unlimited articles and receive our daily update briefing. Gain better insights into what is happening in commercial aviation safety.
Support AeroInside by sending a small tip amount.
An AirbridgeCargo Airlines Boeing 747-8, registration VP-BBP performing flight RU-382 from Frankfurt/Main (Germany) to Moscow Sheremetyevo (Russia)…
An Airbridge Cargo Boeing 747-8 freighter, registration VQ-BRJ performing flight RU-558 from Shenzhen (China) to Moscow Domodedovo (Russia), was…
An AirBridgeCargo Boeing 747-400, registration VQ-BJB performing freight flight RU-766 from Frankfurt/Main (Germany) to Moscow Sheremetyevo (Russia),…
A Ryanair Boeing 737-800, registration EI-DYC performing flight FR-9719 from Rome Ciampino (Italy) to Brussels Charleroi (Belgium), landed on…
A LATAM Chile Boeing 787-9, registration CC-BGE performing flight LA-8058 from Sao Paulo Guarulhos,SP (Brazil) to Johannesburg (South Africa), was…
Are you researching aviation incidents? Get access to AeroInside Insights, unlimited read access and receive the daily newsletter.Pick your plan and subscribe
A new way to document and demonstrate airworthiness compliance and aircraft value. Find out more.
ELITE Simulation Solutions is a leading global provider of Flight Simulation Training Devices, IFR training software as well as flight controls and related services. Find out more.
Your regulation partner, specialists in aviation safety and compliance; providing training, auditing, and consultancy services. Find out more.
Popular aircraftAirbus A320
Boeing 737-800 MAX
Popular airlinesAmerican Airlines