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Tag Archives: error

DGCA: Disappoints even when reporting data

14 Friday Nov 2014

Posted by theflyingengineer in Airline

≈ Leave a comment

Tags

data, DGCA, error

DGCA Data Error

The DGCA’s capabilities (or the lack of it) have come under question both before and after the FAA downgrade. What is further disappointing is that the data published by the DGCA is not accurate enough to be used for serious academic or analytical purposes. When thumbing through the data for Jet Airways, it was brought to light that the data reported by the DGCA in its Traffic Reports and Traffic Data differ, and both differ from the data reported by the airline.

Interestingly, the errors reported in the ‘Traffic Data’ for Jet Airways as published on its site are at places huge. The ‘Traffic Reports’, released around the 15th of every month, are more accurate, but lack sufficient data for an analysis. Certain data with have an error less than 1% may be ignored on a case basis. But the question still lingers: how two publications from the DGCA can have largely differing data between them – an error that may not be attributed to rounding-off-error.

This discrepancy was brought to light only through Jet Airways’ published data. Since other airlines do not publish such data, the extent of errors and deviations are uncertain.

Further, in the month of November, two airlines, both flying with red colours, have had numerous cancellations and delays. Delays and cancellations are reported by airports. In the case of Bangalore’s Kempegowda International Airport, the airport has been using the term ‘rescheduled’ for one particular carrier (and interestingly not for any other carrier), which effectively masks both delays and cancellations. In such a case, a delayed flight, operating ‘on time’ in accordance with a ‘rescheduled’ departure timing will prevent true OTP data (though the DGCA does not yet list the OTP for the airline in question) and ‘Cancellation Rate’ from being published in Traffic Reports, making comparisons between airlines both difficult and unfair.

Improper Modification Proves Costly

04 Wednesday Dec 2013

Posted by theflyingengineer in General Aviation Interest

≈ 1 Comment

Tags

Air, Airbus, costly, Cross, error, Lufthansa, Maintenance, Southwest, Tran, Wire

717_AirtranImproper aircraft modifications have proven to be fatal, in the past, taking the lives, innocent or not, of the men and women on board. Aircraft modifications are the responsibility of maintenance personnel, who ensure that the modification is done right, and checked before releasing the aircraft.

On December 3rd, 2013, the U.S. Department of Transportation’s Federal Aviation Administration (FAA) proposed a $325,000 penalty against Dallas-based Southwest Airlines for allegedly operating an aircraft that had been improperly modified, violating Federal Aviation Regulations. The aircraft is a Boeing 717, operating for US based low cost carrier AirTran Airways, which is in the process of merging with Southwest.

On Aug. 29, 2011, maintenance personnel improperly installed a switch that enables flight crews to test the windshield heating system on a Boeing 717. The Boeing 717, unlike most other Western airplanes in operation, has 7 cockpit glass panels (excluding the eyebrows). Of these, three (left, center and right) are the front facing windshields, and the rest windows.

Proper installation of the switch would have allowed personnel to isolate the windshield anti-ice system that was causing a warning that the windshield heater was failing. Instead, the center and left windshield warning systems were reversed. The right windshield warning system continued to operate properly. The aircraft was operated on 1,140 passenger flights before the problem was corrected.

Southwest spokeswoman Brandy King said that the installation error didn’t compromise safety as it was an extra system. The primary system for alerting crews to a potential window-heater malfunction was still working.

On the 20th of March, 2001, a Lufthansa Airbus A320 almost crashed when the captain’s sidestick was cross-wired in error by maintenance personnel. Although the captain commanded a right roll input, the airplane rolled left. Following the brief confusion, when the left wing-tip was around 2ft from the ground, the first officer, whose controls operated normally, took over by overriding the captain’s side stick input.

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