Get our runways running- Hindustan Times
The Delhi airport handles more than 700 flights a day. A big number, you might think, considering the nagging delays and other problems that frequent flyers complain they encounter regularly.
But compare the figure with those of airports in the US and it loses its bite.
The Atlanta International airport, for instance, handles 2,680 flights every day, Chicago’s O’Hare International Airport 2,415.
Compared to the three functional runways of Delhi’s Indira Gandhi International Airport (IGIA), Atlanta has five and the Chicago airport seven.
How do you think Uncle Sam’s airports handle the congestion so well?
The experts we talked to pointed at the cutting edge navigational systems they employ.
Air congestion has been well accounted for at IGIA since the third runway was opened last year. The separation between landing aircraft has been reduced from 5 nautical miles to 3 nautical miles.
But the airport has still been unable to handle the growing number of flights seamlessly.
In September last year, the Airports Authority of India (AAI) that handles air traffic at all civil airports in the country introduced a satellite-based Performance Based Navigation System (PBNS) in Delhi and Mumbai airports.
The new system was expected to enhance the flight handling capacity of IGIA from 40 flight movements per hour (the current figure) to 50-60 movements. The system is yet to function properly in Delhi.
PBNS can automatically determine an aircraft's path that makes its approach and landing more precise and faster. The aircraft, however, must be equipped with the system too.
To be on time
“Only about 45 per cent of aircraft operating from IGIA had the system on board," said a senior air traffic controller (ATC), who didn't wish to be identified.
“While most aircraft of scheduled airlines have the system, the same is not true of the small aircraft and chartered flights. As a result, we had to constantly shuttle between the old ground-based system and PBNS. This only caused more delays.”
An AAI spokesman confirmed the system had been “pushed back” in Delhi.
“In Delhi, we had been working in different modes for some time and all runways were not always available,” the spokesman said.
“By using the (satellite-based) system, we will be able to precisely monitor an aircraft....”
Only a shift from the present ground based navigation system to one based on satellite, senior ATCs said, can solve the problem of air traffic congestion for good.
Isro help
This is where the AAI’s ambitious GPS-aided Geo Augmented Navigation (GAGAN), jointly developed by the Indian Space Research Organisation, comes into play. It will allow for better precision with the GPS-based aircraft position and will allow closer routes and enhanced capacity.
“GAGAN is in the final operation phase and requires some certifications,” he said. "We will also need to connect all ground stations before it can be launched.”