Incident Overview

Date: Wednesday 10 July 1957
Aircraft Type: Lockheed L-749 Constellation (C-121A)
Owner/operator: Ethiopian Air Lines
Registration Number: ET-T-35
Location: 49 km from Khartoum – ÿ Sudan
Phase of Flight: En route
Status: Destroyed, written off
Casualties: Fatalities: 0 / Occupants: 20
Component Affected: Main landing gear brakesMain landing gear brakes
Category: Accident
An Ethiopian Air Lines Flight 3 experienced a forced landing due to a catastrophic engine fire. The initial engine fire triggered a violent fire and subsequent explosion, resulting in a large skid and a significant wing buffeting. The no. 2 engine dropped clear of the aircraft, causing severe damage to the left wing.An Ethiopian Air Lines Flight 3 experienced a forced landing due to a catastrophic engine fire. The initial engine fire triggered a violent fire and subsequent explosion, resulting in a large skid and a significant wing buffeting. The no. 2 engine dropped clear of the aircraft, causing severe damage to the left wing.

Description

Ethiopian Air Lines Flight 3 departed Athens at 22:36 for a flight to Addis Ababa via Khartoum. The first leg of the flight was uneventful and the flight departed Khartoum at 05:55 GMT. At 06:10 the aircraft was climbing through FL105 to the cruising altitude of FL175 when the no. 2 engine fire warning light for zones 2 and 3 came on and the warning bell rang. The engine was feathered and the CO2 bottle fired. An explosion occurred however, followed by a violent fire, forcing the crew to make a gear-up forced landing on a large flat cultivated area. The aircraft skidded for 1020 feet before coming to rest. Just before the forced landing (at 1000 feet height) the no. 2 engine had dropped clear of the aircraft, causing severe buffeting and sharp lowering of the left wing. PROBABLE CAUSE: “The overheating of the brakes of the main landing gear during the aircraft’s taxiing and take-off run. It was caused by a dragging brake and a leakage of hydraulic oil with resultant fire and tire blow out. The tire blow out resulted in damage to hydraulic oil and fuel lines within the confined area of no.2 engine nacelle, between the rear spar, and between the fuselage and left side of the landing gear wheel well doors.”

Primary Cause

Overheating of the main landing gear brakes during taxiing and takeoff, caused by a dragging brake and hydraulic oil leakage.Overheating of the main landing gear brakes during taxiing and takeoff, caused by a dragging brake and hydraulic oil leakage.

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