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ASN Wikibase Occurrence # 147099
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Type:Silhouette image of generic B732 model; specific model in this crash may look slightly different    
Boeing 737-232
Owner/operator:Delta Air Lines
Registration: N322DL
MSN: 23094/1026
Fatalities:Fatalities: 0 / Occupants: 49
Other fatalities:0
Aircraft damage: Minor
Location:Dallas-Fort Worth, TX -   United States of America
Phase: Take off
Nature:Passenger - Scheduled
Departure airport:Dallas/Fort Worth International Airport, TX (DFW)
Destination airport:Houston-Intercontinental Airport, TX (IAH)
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
The right engine separated from the wing as the airplane was climbing through 200 feet after takeoff. Following the engine separation, the crew continued the climb and were vectored for an uneventful landing without further incident. Engine separation was the result of the failure of the aft cone bolt and the engine secondary support assembly. The aft cone bolt failed as result of a preexisting fatigue crack, while the engine secondary support assembly failed as result of the dynamic loads that exceeded the designed capacity of the mounting bolts. The two forward cone bolts failed in overload as the engine swung forward during the separation sequence. Metallurgical testing revealed that the fatigue of the aft cone bolt was a result of lubricant inadvertently introduced into the conical surface of the cone bolt.
PROBABLE CAUSE: "The failure of the aft cone bolt as result of preexisting fatigue cracking due to improper maintenance, and the failure of the secondary support structure as a result of loads that exceeded the capacity of the attaching hardware and the crushable honeycomb core."




Photo of N322DL courtesy

Anchorage - Ted Stevens Anchorage International (PANC / ANC)
16 May 2019; (c) Ralph M. Pettersen

Revision history:

26-Jul-2012 07:20 harro Added
21-Dec-2016 19:28 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]

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