Nagpur

The cause of the accident has been attributed as the commander while landing during bad weather had descended at a very fast rate and subsequently could not arrest the sink rate while approaching close to the runway due to improper handling of engine controls. Non-availability of deteriorating visibility conditions to the flight crew at the time of landing is a contributory factor.

The accident is attributable to a sudden and strong cross wind gust in heavy rain experienced during the landing.

The cause of the accident could not be established. Although there is little substantial evidence to support the assumption, it is possible that a sudden malfunctioning of the auto-pilot and/or a sudden failure of the electrical power may have created conditions which made it impossible for the crew to retain control of the aircraft, thus causing it to lose height rapidly and crash to the ground.

Engine problems in flight.

The aircraft crashed as a result of slipping into the ground in the course of a badly executed steep turn to port carried out at night at a low altitude. No importance need be attached to the fact that the captain took a turn to the left instead of to the right, as is generally done by most of the pilots when taking off for Delhi from Runway 27. We find from the record that it was not unusual for the pilot in question to take a turn to the left but the mistake lay in badly executing a turn. The reason for such a steep turn is not easy to ascertain. It is possible that the pilot may have done so in order to get on course quickly. It is also possible that he relied on visual reference instead of flying entirely on instruments as he should have done, thereby going into a turn steeper than intended, or it may be that he was misled by the instruments.

Loss of critical height during a steep left hand turn, with the undercarriage down, executed by the pilot at an unsafe altitude in an attempt to return to the aerodrome, after experiencing a temporary loss of power of the left engine soon after getting airborne. A false right engine fire warning precipitated the attempt at a forced landing. The following findings were reported by the Calcutta High Court:
- The port engine of the plane lost power after getting air-borne causing a swing and that it was due to defective supervision and check up,
- The swing corrected itself when the port engine revived again,
- In spite of failure of the port engine and/or correction thereof, the Captain and/or Pilots in charge did not follow the ordinary and usual procedure under such circumstances, namely, did not throttle back the engine and land straight ahead though there was sufficient length of runway available in front, to land and pull up even with the wheels down and certainly with the wheels up,
- Even though the engine revived, the fact that the gear was down was overlooked by both the pilots,
- A false starboard engine fire warning precipitated the attempt at forced landing obviously on account of defective supervision and check up,
- The lack of sufficient intensive checks for emergency procedures during the past twelve months preceding the accident which it is alleged, if carried out, might have given the pilot confidence, apart from practice enabling him to deal coolly with an emergency of this nature.

Wrong approach configuration on part of the flying crew who decided to pass below the glide and continue the approach at an insufficient height. A wrong altimeter setting was considered as a contributory factor, the crew continued the approach in QNH mode instead of QFE.