Jet2 B738 at Ibiza on Jul 21st 2011, engine shut down in flight
Last Update: November 6, 2012 / 17:16:47 GMT/Zulu time
Incident Facts
Date of incident
Jul 21, 2011
Classification
Incident
Airline
Jet2.com
Aircraft Type
Boeing 737-800
ICAO Type Designator
B738
the failure of the #4 bearing, which in turn failed due to spalling, or flaking of the material on the outer raceway and on the rollers. The engine manufacturer is aware of this failure mode. It happens relatively infrequently and its occurrence is actively tracked. Spalling is the subject of a few prevention campaigns.
The aircraft departed Ibiza's runway 06 with the first officer (28, ATPL, 3,086 hours total, 687 hours on type) being pilot flying, when a few seconds after the main wheels lifted off the runway a series of "detonations" were heard inside and outside the aircraft originating from the right hand engine. Ibiza tower observed streaks of flames from the right hand engine exhaust. The crew initially thought they had blown a tyre and delayed gear retraction until they realised 26 seconds later the right hand engine had failed. They then retracted the gear, declared Mayday and continued the climb with both engines operating. About 50 seconds later, with the vibrations from the right hand engine increasing and EGT beginning to exceed limits, the crew initiated the engine shut down. After reaching acceleration altitude (1000 feet) the crew accelerated the aircraft retracting the flaps and continued the climb to 3000 feet. Upon reaching 3000 feet the crew reported there was no (engine) fire and requested to enter a hold to run the checklists. The aircraft was handed off to Palma Mallorca Approach to facilitate the hold. The captain (42, ATPL, 10,900 hours total, 250 hours on type) subsequently decided to divert to Palma Mallorca although the "Engine Severe Damage or Separation" checklist required landing at the nearest airport. The captain reasoned to keep the aircraft away from built up areas, the facilities available in Palma included two parallel runways at Palma, and they were at a position nearly equidistant to Ibiza and Palma. The crew subsequently confirmed their roles with the first officer being pilot flying and the captain being pilot monitoring, briefed the approach and go-around for Palma and landed safely on Palma Mallorca's runway 24L about 40 minutes after becoming airborne.
The #4 bearing, located at the high pressure turbine supporting the high pressure spool shaft, is mainly exposed to radial loads as result of aerodynamic loads of the turbine as well as relatively high temperatures. Since introduction of the engine type several failures of the bearing had thus occurred, mainly caused by the "spalling" flaking or chipping off the surface of the rollers contacting the outer race of the bearing. Between 1998 and 2010 the manufacturer had changed the specifications of the materials a number of times resulting in a reduction of the shut down rate of 4 shut downs per one million flights in the beginning to 0.52 shut downs per million flights in the end. The manufacturer stated that in 30% of these cases errors in the production/assembly of the bearings led to the failure, while 3% of the cases were attributed to pollution during handling and 17% to quality control issues. The remaining 50% of cases could not be attributed.
The failure of bearing #4 led to slight blade damage in the high pressure compressor and substantial blade damage in the high pressure turbine. Analysis of the #4 bearing confirmed the bearing and its materials matched required specifications.
The CIAIAC analysed that the "detonations" heard were in fact compressor stalls as result of the blade tip damage and slightly reduced rpms following the #4 bearing failure resulting in air flow disruption throughout the engine making flames of the engine's combustion visible at the engine outlet as streaks of flame.
Laboratory examination showed outer race and rollers in an angular sector of about 90 degrees had suffered surface damage causing an imbalance. However, none of the engine monitoring sensors had recorded anything out of the normal prior to the incident flight, there had been no anomaly with the engine's chip detector or engine vibrations. The laboratory tests were not able to identify the location where spalling began.
No safety recommendation was released as result of the investigation.
Incident Facts
Date of incident
Jul 21, 2011
Classification
Incident
Airline
Jet2.com
Aircraft Type
Boeing 737-800
ICAO Type Designator
B738
This article is published under license from Avherald.com. © of text by Avherald.com.
Article source
You can read 2 more free articles without a subscription.
Subscribe now and continue reading without any limits!
Read unlimited articles and receive our daily update briefing. Gain better insights into what is happening in commercial aviation safety.
Send tip
Support AeroInside by sending a small tip amount.
Related articles
Financial Safety Nets: Lessons from Personal Finance for Airline Fiscal Management
In both personal finance and corporate financial strategy, building a safety net is essential. For individuals, it provides security during uncertain…
Sustainable Aviation: How Green Technologies Are Shaping the Future of Air Travel
Transport category airplanes use jet fuel which releases carbon dioxide into the atmosphere and contributes to climate change. But things are…
Extended Layovers: How to Enjoy Your Airport Time
Most of us dread layovers, especially the extended ones, but sometimes they are simply unavoidable. Whether your flight was delayed or you simply…
AeroInside Monthly Aviation Safety Review November 2024
November 2024 was a busy month in aviation safety. Please find our summary below.All in all, 77 new articles have been published during last month.…
Cybersecurity in Aviation: Best Practices to Protect Data and Communication Channels
The cybersecurity landscape in aviation is in a state of continuous flux, with emerging threats posing substantial risks to data security and…
Newest articles
Financial Safety Nets: Lessons from Personal Finance for Airline Fiscal Management
In both personal finance and corporate financial strategy, building a safety net is essential. For individuals, it provides security during uncertain…
Fleet type match
VivaAerobus A320 near Zacatecas on Dec 11th 2024, smoke and smell
A VivaAerobus Airbus A320-200, registration 9H-SWI performing flight VB-1000 from Mexico City to Ciudad Juarez (Mexico), was enroute at FL340 about…
Subscribe today
Are you researching aviation incidents? Get access to AeroInside Insights, unlimited read access and receive the daily newsletter.
Pick your plan and subscribePartner
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.
SafetyScan Pro provides streamlined access to thousands of aviation accident reports. Tailored for your safety management efforts. Book your demo today
AeroInside Blog
Popular aircraft
Airbus A320Boeing 737-800
Boeing 737-800 MAX
Popular airlines
American AirlinesUnited
Delta
Air Canada
Lufthansa
British Airways