Knowledge (XXG)

2007 Bombardier Dash 8 landing gear accidents

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element migrated into the hydraulic line. ... the rogue O-ring was transferred from the SSV side of the hydraulic line to the Actuator side of the hydraulic line while trapped inside a Union ... It was the opinion of the mechanic that if an O-ring was hidden inside one of the Unions, it would have been observed. ... However, it was not observed that the O-ring was trapped inside the Union. The AIB can not exclude that a thorough inspection of the Unions according to a defined inspection procedure might have led to a finding of the rogue O-ring. But any inspection done by humans is related to human factors and not a guarantee of any findings. It was proven that the O-ring could be trapped inside the Unions, and it was difficult to observe that fact. Furthermore there was no reason for the mechanic to anticipate that a foreign object was present in the Unions because was not mentally prepared to find anything. Furthermore, the mechanic was told to do the reconfiguration and was not involved in the trouble shooting on the MLG. Probably, the conception of the work was that it was routine work and for that reason, a foreign object present in any of the Unions was not anticipated.
665:, Norway to Copenhagen, Denmark with 40 passengers and 4 crew members when problems with the main landing gear were discovered. After waiting about two hours in the air to burn fuel and troubleshoot, the pilots attempted a prepared emergency landing. The pilots were forced to land the aircraft with the right main landing gear up. The right engine was shut down prior to the landing, because in the previous landings the propeller had hit the ground and shards of it ripped into the fuselage. This was not on the emergency checklist, rather it was the pilots making a safety-based decision. The aircraft stopped on the runway at 16:53 local time with the right wing touching the surface. It did not catch fire and the passengers and the crew were evacuated quickly. There were no serious injuries. The aircraft in question was one of six that had been cleared to fly just a month before, following the grounding of the entire Scandinavian Airlines Q400 fleet due to similar landing gear issues. The entire fleet was grounded again following the accident. 375: 206: 37: 623:
landing.) The outcome of the investigation was that the cause was not a lack of maintenance but over-cleaning of the landing gear, with pressure washers being used that washed out the corrosion preventative coatings between the eyebolt and the actuator rod end. The airline reportedly made 2,300 flights in which safety equipment was not up to standard, although the airline denied this.
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When the handle for lowering the landing gear was activated, the indicator showed two green and one red light. The red light indicated that the right main gear was not locked in position. The landing was aborted. Attempts at lowering the gear manually were also unsuccessful. An investigation into the
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It is evident that the corrosion had attacked the piston rod threads that were in direct engagement with the rod end threads whereas the corrosion attacked in the key way area and in the non-engaged threads was less severe. This suggested that galvanic action between the nobler martensitic stainless
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Prior to landing, the right main landing gear failed to lock and the crew circled for an hour while trying to fix the problem then preparing for an emergency landing. After the aircraft touched down, the right landing gear collapsed, the right wing hit the ground, and a fire broke out. The fire went
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The Solenoid Sequence Valve (SSV) down port and up port filter elements may not withstand normal Landing Gear hydraulic operational pressure fluctuations and may collapse. At a given time prior to the accident, the SSV down port filter element collapsed and the O-ring located adjacent to the filter
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when landing gear problems were discovered before landing. Again, the right landing gear collapsed immediately after the aircraft touched down. All passengers and crew were evacuated safely. The local officials at Vilnius International Airport noted that this was the most serious accident in recent
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On 10 March 2008, a multi-party agreement was announced, attempting to finalize the roles of maintenance and manufacture in causing the SAS accidents; as settlement the airline and its partners ordered a replacement set of short-haul aircraft from Bombardier, and in turn received a US$ 164 million
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Previous maintenance procedures mandated checking this component after 15,000 landings. The new maintenance schedule affected about 85 of the 165 Q400 aircraft worldwide. Some operators found that spare parts for this unexpected actuator replacement program were not available, grounding their
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began an investigation of the accident, it brought renewed focus on SAS maintenance procedures. (Only two weeks previously, Swedish authorities had levelled a scathing critique at the airline after an aircraft of the same model nearly crashed because its engine accelerated unexpectedly during
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On 14 September 2007, Bombardier issued an All-Operators Message (AOM) recommending new procedures concerning the landing gear inspection for all aircraft with more than 8,000 flights. Bombardier acknowledged the likelihood of corrosion developing inside the
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recommended that all Q400 aircraft with more than 10,000 flights stay grounded until further notice, affecting about 60 of the 160 Q400 aircraft then in service worldwide. As a result, several hundred flights were cancelled around the world.
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applicable to Bombardier Q400 turboprop aircraft instructing all Q400 aircraft operators to conduct a general visual inspection of the left and right main landing gear systems and main landing gear retract actuator
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Investigators detected corrosion inside actuators on 25 of 27 aircraft they checked. Accordingly, SAS decided to continue the grounding of its Q400 fleet until all the affected parts were replaced.
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out before the aircraft came to rest and all passengers and crew were evacuated. Five people had minor injuries, some from parts of the propeller entering the cabin and others from the evacuation.
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The preliminary Danish investigation determined this latest Q400 accident was unrelated to the airline's earlier corrosion problems; in this particular case being caused by a misplaced
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of the threads on both the inside threads of the piston rod and the outside threads of the rod end, leading to reduced mechanical strength of the actuator and eventual failure.
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On 28 October 2007, SAS announced that it would retire its entire fleet of Q400 aircraft after a third accident involving the landing gear occurred the day prior.
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announced that "...the Scandinavian airworthiness authorities will reissue the Certificates of Airworthiness relevant to this aircraft type in the coming days".
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AIB Denmark (Havarikommissionen) noted that the use of different alloys in the bolt and surrounding construction was most probably a contributing factor:
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After the second accident in Vilnius, SAS grounded its entire Q400 fleet consisting of 27 aircraft, and a few hours later the manufacturer
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In September 2007, two separate accidents due to similar landing gear failures occurred within three days of each other on
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It has been speculated that a November 2007 shakeup of Bombardier management was spurred by the Q400 landing gear issues.
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Havarikommissionen (Danish Accident Investigation Board) report on the accident of the aircraft LN-RDI
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Havarikommissionen (Danish Accident Investigation Board) report on the accident of the aircraft LN-RDK
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System (SAS) was accused of cutting corners in the maintenance of its Q400 aircraft. As the
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Aviation accidents and incidents in Metropolitan Denmark, the Faroe Islands, and Greenland
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years. This accident was also caused by corroded threads in the piston rod and rod end.
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eyebolt had broken away from the actuator. A further analysis of the actuator showed
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On 27 October 2007, a Q400 registered as LN-RDI was operating SAS Flight 2867 from
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found blocking the orifice in a hydraulic restrictor valve. Accordingly, the
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steel and the less noble 4340 steel material had enhanced corrosion.
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cause of the failure to deploy revealed that the right main gear
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Accidents and incidents involving the De Havilland Canada Dash 8
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A second accident occurred when a Bombardier Q400, operating as
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LN-RDK was the first SAS aircraft to have a landing gear failure
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Airliner accidents and incidents caused by mechanical failure
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commenced a preliminary investigation regarding suspicion of
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EMERGENCY AIRWORTHINESS DIRECTIVE AD No : 2007-0252-E
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The aftermath of LN-RDS after landing at Vilnius airport
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LN-RDI, the aircraft involved in the accident, in 2003.
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Archived from 898:"Vilniuje avariniu bĹ«du nusileido SAS lÄ—ktuvas" 872:"Regarding Scandinavian Airlines flight SK2748" 681: 628: 2314:Scandinavian Airlines accidents and incidents 2309:Aviation accidents and incidents in Lithuania 2117: 1729: 1376: 18:2007 Bombardier Dash 8 landing gear incidents 8: 367: 198: 29: 2304:Aviation accidents and incidents in Denmark 1325:Video of the SAS Dash8-Q400 accident at AAL 2124: 2110: 2102: 1736: 1722: 1714: 1383: 1369: 1361: 373: 366: 204: 197: 35: 28: 1028:"Airworthiness review meeting DASH 8-400" 2299:Aviation accidents and incidents in 2007 2259:Bombardier Dash 8 landing gear incidents 1667:Scandinavian Airlines System Flight 2867 1627:Scandinavian Airlines System Flight 2748 1617:Scandinavian Airlines System Flight 1209 657:Scandinavian Airlines System Flight 2867 642:Scandinavian Airlines System Flight 2748 636:Scandinavian Airlines System Flight 2748 554:Scandinavian Airlines System Flight 1209 549:Scandinavian Airlines System Flight 1209 368:Scandinavian Airlines System Flight 2867 199:Scandinavian Airlines System Flight 2748 30:Scandinavian Airlines System Flight 1209 2224:Icelandair FlugfĂ©lag Islands Flight 704 1022: 1020: 825:"Plane crash disaster narrowly avoided" 769:. Havarikommissionen. 13 September 2007 755: 1285:"Bombardier names Pierre Beaudoin CEO" 1149: 1147: 702:grounded nineteen of its aircraft and 1005:. Havarikommissionen. 3 November 2007 620:Swedish Civil Aviation Administration 7: 2162:KLM Douglas DC-3 Copenhagen disaster 1537:San Francisco Int'l runway incursion 1295:from the original on 19 January 2015 1547:Paramount Airlines helicopter crash 831:. 10 September 2007. Archived from 798:. 19 September 2007. Archived from 1181:"Widerøe bytter ut viktig fly-del" 25: 2091:List of airline holding companies 1984:Swedish Intercontinental Airlines 1587:Phoenix news helicopter collision 1084:"Planes grounded after 2nd crash" 1060:12 September 2007. Archived from 920:"Dash 8-fly forulykket i Kastrup" 648:, Lithuania, but was diverted to 2014:1948 Northwood mid-air collision 1507:Blue Angels South Carolina crash 1393:Aviation accidents and incidents 2319:September 2007 events in Europe 2078:SAS Frösundavik Office Building 1497:Mogadishu TransAVIAexport crash 674:European Aviation Safety Agency 1657:Philippine Airlines Flight 475 1647:Africa One Antonov An-26 crash 1637:One-Two-Go Airlines Flight 269 1: 2324:October 2007 events in Europe 2197:Godthab (Nuuk) Catalina crash 2061:Dash 8 landing gear incidents 1904:British Midland International 1467:Zell am See mid-air collision 1000:"LN-RDI – Preliminary Report" 764:"LN-RDK – Preliminary report" 650:Vilnius International Airport 312:Palanga International Airport 248:Vilnius International Airport 543:Scandinavian Airlines System 453:Scandinavian Airlines System 433:Bombardier Dash 8-400 (Q400) 284:Scandinavian Airlines System 264:Bombardier Dash 8-400 (Q400) 95:Bombardier Dash 8-400 (Q400) 1477:Garuda Indonesia Flight 200 483:Copenhagen Airport, Denmark 224:12 September 2007 115:Scandinavian Airlines (SAS) 2350: 2154:Ă…lvand RAF Lancaster crash 1357:even though it says Danish 1289:United Press International 605:endangering another person 595:On 19 September 2007, the 55:9 September 2007 2329:2007 disasters in Denmark 2269: 2205:Thule Air Base B-52 crash 2189:Danish football air crash 2086: 1696: 1607:China Airlines Flight 120 1557:Free Airlines L-410 crash 1408: 679:The final report stated: 563:as LN-RDK, took off from 393:27 October 2007 372: 203: 34: 1577:TAM Airlines Flight 3054 1527:Kenya Airways Flight 507 1427:Aerian-TurM An-26 crash 855:"Report HCLJ510-000433" 734:aircraft indefinitely. 715:Airworthiness Directive 1874:AerolĂ­neas de Baleares 1597:Air Moorea Flight 1121 709:On 13 September 2007, 686: 633: 611:Maintenance procedures 558:Bombardier Dash 8 Q400 539:Bombardier Dash 8 Q400 1879:AerolĂ­neas Argentinas 1801:Scandinavian Airlines 1785:Scandinavian Airlines 1759:Scandinavian Airlines 876:Scandinavian Airlines 796:Scandinavian Airlines 616:Scandinavian Airlines 541:aircraft operated by 2039:(New York City 1984) 1914:Continental Airlines 1677:Atlasjet Flight 4203 1447:RĂ©gional Flight 7775 1317:VG Newspaper article 1291:. 28 November 2007. 1265:. CBC. 10 March 2008 695:Bombardier Aerospace 408:Landing gear failure 239:Landing gear failure 70:Landing gear failure 2251:Partnair Flight 394 1949:Rezidor Hotel Group 1944:Norwegian Air Lines 1822:SAS Ground Handling 1752:Subsidiary airlines 1705:►   2008 1699:2006   ◄ 1457:Adam Air Flight 172 1437:Air West Flight 612 1417:Adam Air Flight 574 1213:on 21 November 2007 1187:. 17 September 2007 1114:on 14 February 2012 1096:on 27 January 2013. 1064:on 18 November 2007 1034:on 21 February 2009 900:. 12 September 2007 878:. 12 September 2007 835:on 18 November 2007 829:The Copenhagen Post 369: 200: 31: 2226:(September 1970**) 2027:(Los Angeles 1969) 1702:    1350:2015-09-24 at the 1335:2015-09-24 at the 1243:on 2 November 2014 1138:2007-10-31 at the 955:on 31 October 2007 586:hydraulic actuator 565:Copenhagen Airport 439:Aircraft name 429:Aircraft type 417:Copenhagen Airport 303:Copenhagen Airport 270:Aircraft name 260:Aircraft type 135:Copenhagen Airport 101:Aircraft name 91:Aircraft type 2276: 2275: 2099: 2098: 1711: 1710: 1687:TAROM Flight 3107 1567:PMTair Flight 241 1517:Shatoy Mi-8 crash 1161:14 September 2007 1157:(Press release). 1089:Los Angeles Times 704:Austrian Airlines 535: 534: 365: 364: 196: 195: 16:(Redirected from 2341: 2262: 2261:(September 2007) 2254: 2253:(September 1989) 2235: 2232:MalĂ©v Flight 731 2227: 2208: 2200: 2192: 2173: 2172:(February 1947*) 2165: 2157: 2149: 2126: 2119: 2112: 2103: 1924:Danish Air Lines 1869:AB Aerotransport 1738: 1731: 1724: 1715: 1703: 1487:UTair Flight 471 1403: 1402: 1400: 1385: 1378: 1371: 1362: 1356: 1341: 1321: 1305: 1304: 1302: 1300: 1281: 1275: 1274: 1272: 1270: 1259: 1253: 1252: 1250: 1248: 1239:. 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1989:Thai Airways 1959:SAS Commuter 1929:Estonian Air 1848:WOW Alliance 1778:Destinations 1355:(in English) 1340:(in English) 1297:. 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Index

2007 Bombardier Dash 8 landing gear incidents

Aalborg Airport
Bombardier Dash 8-400 (Q400)
Scandinavian Airlines (SAS)
Registration
Copenhagen Airport

Vilnius International Airport
Bombardier Dash 8-400 (Q400)
Scandinavian Airlines System
Registration
Palanga International Airport

Copenhagen Airport
Bombardier Dash 8-400 (Q400)
Scandinavian Airlines System
Registration
Bergen Airport
Bombardier Dash 8 Q400
Scandinavian Airlines System
Bombardier Dash 8 Q400
registered
Copenhagen Airport
Aalborg Airport
hydraulic actuator
corrosion
prosecutor
Stockholm
Scandinavian Airlines

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