| B737-700 motorhaveri i Usa |
Kommer bli mkt extra inspektioner på B737-700 motorer
Pga haveri3t i Usa Southwest nyligen... |
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Jimbo
2018-05-06 13:59:18
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SV: B737-700 motorhaveri i Usa
Ny AD på CFM56-7B motorer:
http://avherald.com/h?article=4b798bcf&opt=0
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CFIT
2018-04-22 03:05:02
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SV: B737-700 motorhaveri i Usa
Ja?!
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Jimbo
2018-04-21 08:26:47
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SV: B737-700 motorhaveri i Usa
FAA issues Emergency AD on CFM56-7B engines
By Simon Hradecky, created Saturday, Apr 21st 2018 04:46Z, last updated Saturday, Apr 21st 2018 04:46Z
The FAA have released Emergency Airworthiness Directive (EAD) 2018-09-51 concerning all CFM56-7B engines with 30,000 or more flight cycles (estimated 352 engines within the USA and 681 engines globally). The FAA reasons:
This emergency AD was prompted by a recent event in which a Boeing Model 737-700 airplane powered by CFM56-7B model engines experienced an engine failure due to a fractured fan blade, resulting in the engine inlet cowl disintegrating. Debris penetrated the fuselage causing a loss of pressurization and prompting an emergency descent. Although the airplane landed safely, there was one passenger fatality. Fan blade failure due to cracking, if not addressed, could result in an engine in-flight shutdown (IFSD), uncontained release of debris, damage to the engine, damage to the airplane, and possible airplane decompression.
See Accident: Southwest B737 near Philadelphia on Apr 17th 2018, uncontained engine failure takes out passenger window for details of the accident referenced by the EAD.
The FAA reports that CFM Service Bulletin CFM56-7B S/B 72-1033 dated April 20 (SB) 2018 provides action for engines with fewer than 30,000 flight cycles, however, the EAD affects engines with 30,000 or more flight cycles only. In addition the SB requires reporting of the inspection results, the EAD does not require reporting. Otherwise there is no difference between the SB and the EAD.
The EAD requires all 24 fan blade dovetail concave and convex sides of CFM56-7B engines to undergo ultrasonic inspection to detect cracking within 20 days. If any unservicable fan blades are being found, they are to be removed from service before further flight.
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