Accident
Last updated: 30 August 2014
Statuts:Enquête Officielle
Date:vendredi 16 août 1991
Heure:12:46
Type/Sous-type:Silhouette image of generic B732 model; specific model in this crash may look slightly different
Boeing 737-2A8
Compagnie:Indian Airlines
Immatriculation: VT-EFL
Numéro de série: 21497/504
Année de Fabrication: 1977-11-17 (13 years 9 months)
Heures de vol:29729
Cycles:33574
Moteurs: 2 Pratt & Whitney JT8D-17A
Equipage:victimes: 6 / à bord: 6
Passagers:victimes: 63 / à bord: 63
Total:victimes: 69 / à bord: 69
Dégats de l'appareil: Détruit
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:38 km (23.8 milles) SW of Imphal Municipal Airport (IMF) (   Inde) show on map
Phase de vol: En approche (APR)
Nature:Transport de Passagers Nat.
Aéroport de départ:Calcutta-Netaji Subhas Chandra Airport (CCU/VECC), Inde
Aéroport de destination:Imphal Municipal Airport (IMF/VEIM), Inde
Numéro de vol: 257
Détails:
Indian Airlines flight IC257 departed Calcutta at 11:54 on a scheduled 60-minute flight to Imphal, India.
The crew contacted Imphal at 12:34. The flight was cleared to descent to from FL290 to 10,000 feet and asked to report overhead the VOR for ILS runway 04.
At 12:39 the crew reported 12 miles inbound at 10,000 feet. The pilot then asked the air traffic controller as to whether they could set course directly outbound for let down. This was approved. Two minutes later the flight reported approaching overhead the VOR, although it was still 14 miles out. The controller then queried: "understand you are proceeding on a radial 217 for ILS". This was confirmed by the crew.
At 12:42 Imphal ATC cleared the flight to proceed outbound for an ILS approach to runway 04 descending to 5,000 feet. At 12:44 the flight reported commencing the procedure turn. This was the last contact with the flight.
The airplane impacted Thangjing Hill, in inclement weather conditions with low clouds and occasional rain.


PROBABLE CAUSE: "The accident occurred by reason of a grave error on the part of the Pilot-in-Command in not adhering to the operational flight plan and ILS let down chart and not realizing that his early descent to 10,000 feet and turning right for outbound leg without reporting overhead VOR would result in loss of time
reference and as such misplace him in the hilly terrain. The Pilot-in-Command's action may have been influenced by his extreme familiarity with the terrain".

Sources:
» Civil aviation aircraft accident summary for the year 1991 (DGAC India)


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Plan
Ce plan montre l'aéroport de départ ainsi que la supposé destination du vol. La ligne fixe reliant les deux aéroports n'est pas le plan de vol exact.
La distance entre Calcutta-Netaji Subhas Chandra Airport et Imphal Municipal Airport est de 599 km (374 miles).

Les informations ci-dessus ne représentent pas l'opinion de la 'Flight Safety Foundation' ou de 'Aviation Safety Network' sur les causes de l'accident. Ces informations prélimimaires sont basées sur les faits tels qui sont connus à ce jour.
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