The Electra entered service in early January 1959 with US operator Eastern Airlines.
Unfortunately, three L188s were to crash with loss of life within the first 16 months of the type’s
introduction to service. The cause, called "whirlpool mode", was eventually identified as a weakness
in the engine mountings which produced excessive engine nacelle vibration, leading to wing flexing
and finally wing separation. Electras were still permitted to operate while the crashes were under
investigation, but their cruising speed was reduced to 255 kts/475kmh. After the fault had been
determined, Lockheed recalled all Electras built to that point and, at its own expense, carried out a
number of modifications including engine mount bracing and installation of additional wing
supports. Each aircraft took approximately 20 days to modify, eventually costing Lockheed a total of
some US$25 million.
Reg Ansett had visited Lockheed
			
		
 
	
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