Mystery of Crash at Bajpe International Airport, India
Mystery of Crash at Bajpe International Airport, India
By Suhas Dighe
22nd May 2010, 0605 hr. An Air India Express Flight IX812 arrived Bajpe International Airport near the Southern City of Mangalore, India. The aircraft (Twin engine Boeing 737-800) had taken off from Dubai about three and half hours earlier and had an uneventful journey over the Arabian Sea. The flight was carrying 166 souls including the crew. The weather at Bajpe was an overcast sky but no rain, visibility a good 6 Kilometers. The aircraft approached runway 24 and was cleared to land.
Something went terribly wrong with that landing. The information about that landing is confusing but it appears that the aircraft overshot the touchdown point by 2000 feet and tried to go around. The runway has a length of 8000 feet and an overshoot area of 90 meters after which there is nothing. The runway is on top of a plateau at 300 feet above sea level and there are gorges 200 to 300 feet totally surrounding it, hence called a tabletop runway. At the end of the overshoot area is an array of antennas [8 of them] which constitute the localizer component of the Instrument Landing System. after the array, right on the edge is short boundary wall. The aircraft hit the leftmost localizer antenna, then the boundary wall and dropped into the valley. It broke up on the way down and exploded into huge ball of fire. It is not yet known, if the aircraft was already airborne at this spot. There were only 8 survivors who had a miraculous escape, some of them were thrown out before fire and others managed to exit after the aircraft finally stopped. The Cockpit Voice Recorder and the Flight Data Recorder have been recovered but the information in it is still not processed.
While the TV channels were covering the site round the clock after the crash and were busy interviewing many, aviation experts, officials of the DGCA (Director General of Civil Aviation), pilots among them. Many a graphic simulations were presented but only added to confusion (wrong runway shown; conversation between the aircraft and the Air Traffic Control using non standard terminology which indicated that the information was hearsay).
Some of the facts are as under:
- The aircraft was new with the state of the art technology.
- The pilots were quite experienced, including experience to land a 737 on the marginal runway.
- They were well rested before the flight.
- 8000 feet is considered quite adequate to operate a 737 on this runway.
- Runway slopes downwards from the beginning to end of the runway by about 20 feet.
- Runway was dry.
- Weather conditions were not critical (visibility, cloud ceiling and the wind velocity).
- Decision Height on a Category I ILS approach is 200 feet.
- A 737 can not abort landing and go around below 300 feet above ground level. It is then committed to land. This is as per an experienced pilot interviewed.
What is yet to be ascertained and may have a bearing on the accident is:
- Was ILS serviceable?
- When was it last calibrated in other words how reliable it was?
- Was the approach made with the help of ILS?
- An ILS assisted approach should have brought the aircraft 200 feet from the beginning of the runway and not 2000 feet ahead of touch down point as is alleged. So what happened if ILS assisted approach was made?
- Were the recommended approach speeds maintained?
- Did aircraft attempt overshoot and if so at what height the overshoot procedure was initiated?
Some answers will come from the CVR and the FDR. Readings of power settings as read from FDR, can tell if the aircraft was in a landing configuration or was going around. This will take weeks since FDR decoding is being done in the USA. Tapes of dialogue between the aircraft and the Air Traffic Control will be immensely useful too.
There was a PIL [Public Interest Litigation] that was filed by a Non Government Organization called ESG. This petition had objected strongly the new runway project and had feared fetal accidents because of the table top nature of the terrain if undertaken. Ironically this accident is like a textbook accident exactly as predicted in this petition. This petition was dismissed by all successive courts including the Supreme Court on assurances by the authorities [DGCA] that all the risks and possible fallouts have been taken into account while sanctioning the project.
However hue and cry about the runways not having adequate overshoot/undershoot areas is rather misplaced. There are so many airfields around the world which have marginal parameters in terms of runway length and clearances around. Old Hong Long airport, Gibraltar, Port Blair, Kulu, Leh, Silchar to name few. At Port Blair a hill blocks pilot’s view of the runway on the finals. He has to pull up to negotiate the hill and dive immediately thereafter to see the runway and adjust power settings. Silchar runway is short and has hills before and after the runway, Leh has only one approach direction for landing and take off. But still they are in use. Kulu airfield is a table top runway like one at Bajpe airport. Long runways on a flat terrain, with adequate overshoot, undershoot areas and state of the art electronic aids etc is desirable but when such things are not available then our flying techniques have to be smart with carefully assessed risk factors that will determine what type of aircraft can operate on a particular airfield and with what limitations and precautions. A procedure called screening of a pilot whenever he is landing for the first time on airfields like Bajpe by an experienced pilot who demonstrates the new pilot all the peculiarities of the airfield is followed all over the world.
So, operations will go on not withstanding the tragic events. Any lessons? The enquiry must establish what went wrong and then make recommendations.
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