Unlawful Interference Boeing 737-2A8 VT-ECR, Thursday 26 April 1979
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Date:Thursday 26 April 1979
Time:11:59
Type:Silhouette image of generic B732 model; specific model in this crash may look slightly different    
Boeing 737-2A8
Owner/operator:Indian Airlines
Registration: VT-ECR
MSN: 20962/380
Year of manufacture:1974
Engine model:Pratt & Whitney JT8D-9A
Fatalities:Fatalities: 0 / Occupants: 67
Other fatalities:0
Aircraft damage: Destroyed, written off
Category:Unlawful Interference
Location:Madras Airport (MAA) -   India
Phase: Landing
Nature:Passenger - Scheduled
Departure airport:Trivandrum Airport (TRV/VOTV)
Destination airport:Madras Airport (MAA/VOMM)
Confidence Rating: Accident investigation report completed and information captured
Narrative:
On its way from Trivandrum to Madras, the aircraft was cleared to descent from FL270. Shortly afterwards an explosion took place in the forward lavatory, causing a complete instrument and electrical failure.
The Boeing had to make a flapless landing at Madras (now Chennai). The aircraft touched down 2500 feet past the runway 25 threshold and overran. The right side of the plane caught fire.

PROBABLE CAUSE: "Detonation of an explosive device in the forward lavatory of the aircraft. The aircraft overshot the runway due to high speed of touchdown, non-availability of reverse thrust and anti-skid system due to systems failure consequent on explosion."

Sources:

Aircraft hijackings and other criminal acts against civil aviation : statistics and narrative reports / FAA
Civil aircraft accidents 1979 / Ministry of Tourism and Civil Aviation, CAD, ASD

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