Incident Overview

Date: Wednesday 19 October 1988
Aircraft Type: Fokker F-27 Friendship 100
Owner/operator: Vayudoot
Registration Number: VT-DMC
Location: 19 km from Gauhati-Borjhar Airport (GAU) – ÿ India
Phase of Flight: Approach
Status: Destroyed, written off
Casualties: Fatalities: 34 / Occupants: 34
Component Affected: Pilot-in-command, ILS procedure, Glide Slope, Locators, ClearancePilot-in-command, ILS procedure, Glide Slope, Locators, Clearance
Category: Accident
A Vayudoot flight 703, departing from runway 06 in Silchar, India at 08:10, encountered difficulties during its outbound leg. The crew failed to receive the glide slope signal, leading to a deviation from the ILS procedure. Subsequently, the aircraft reported an Outer Marker inbound, and lost contact with the controller. The flight ended with a crash due to a pilot error ? failing to properly monitor the middle and outer locators, resulting in a descent below 2750 feet without intercepting the localiser and glide slope. This error was compounded by incorrect ATC clearance, leading to a misinterpretation of the situation.A Vayudoot flight 703, departing from runway 06 in Silchar, India at 08:10, encountered difficulties during its outbound leg. The crew failed to receive the glide slope signal, leading to a deviation from the ILS procedure. Subsequently, the aircraft reported an Outer Marker inbound, and lost contact with the controller. The flight ended with a crash due to a pilot error ? failing to properly monitor the middle and outer locators, resulting in a descent below 2750 feet without intercepting the localiser and glide slope. This error was compounded by incorrect ATC clearance, leading to a misinterpretation of the situation.

Description

Vayudoot flight 703 took off from runway 06 at Silchar, India at 08:10 hours with destination Guwahati. At 08:39 the flight contacted the Guwahati Tower controller, reporting passing FL55 to FL40. At 08:46 the aircraft commenced the procedure turn towards Guwahati but the crew were not getting the glide slope signal. One minute later the flight reported Outer Marker inbound. Last radio contact with the flight was at 08:53. Shortly afterwards the aircraft impacted a hill and caught fire. PROBABLE CAUSE: “An error on the part of the pilot-in-command in obeying the localiser bar on the outbound leg when it is supposed to be disobeyed and which has resulted in disorientation of the pilot resultant effect of which is total non-adherence of the ILS let down procedure at Guwahati viz. failure to monitor the middle and outer locators, allowing the aircraft to descend below 2750 feet without intercepting the localiser and glide slope. The wrong clearance by ATC in asking the aircraft to report outer marker inbound when Captain-in-command reported non-availability of the Glide slope has misled the captain and as such has contributed to the accident. The possibility of sabotage or the aircraft outliving its age has been ruled out.”

Primary Cause

Pilot-in-command error regarding ILS procedure, resulting in disorientation and failure to monitor the middle and outer locators.Pilot-in-command error regarding ILS procedure, resulting in disorientation and failure to monitor the middle and outer locators.

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