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Evidence from Resource 3 pieces of evidence from this resource.

Ministry of Civil Aviation - India (1990). Report on Accident to Indian Airlines Airbus A-320 Aircraft VT-EPN at Bangalore, February 14, 1990. Ministry of Civil Aviation, Government of India.

  1.  
  2. Evidence Type: Excerpt from Accident Report
    Evidence: "... the Court itself has drawn attention to the most probable cause for the engagement of idle/open descent mode was that instead of selecting a vertical speed of 700 feet per minute at the relevant time i.e. about 35 seconds before the first impact, the pilot CM.2 had inadvertently selected an altitude of 700 feet. The vertical speed and altitude selection knobs of the Flight Control Unit (FCU) are close to each other, and instead of operating the vertical speed knob, the pilot CM. 2 had inadvertently operated the altitude selection knob. The altitude of 700 feet that got selected in this manner was lower than the aircraft altitude at that time and therefore the aircraft had gone into open/idle descent mode. That this is the most probable cause for engagement of idle/open descent mode is recognised by the Court in para 14 at page 310 of the report where it has discussed this matter, and in recommendation N0. 29 where the Court has specifically suggested a design change with respect to the two knobs." (page iv)
    Issue: controls of automation may be poorly designed (Issue #37) See Issue details
    Strength: +5
    Aircraft: A320
    Equipment: autoflight FCU

  3.  
  4. Evidence Type: Excerpt from Accident Report
    Evidence: "3 FINDINGS: ... xxix) The aircraft during approach never went to the speed mode which is the proper mode for landing and one of the Flight Directors remained engaged till the time the aircraft crashed. If Capt. Gopujkar [PF] would have also disengaged his Flight Director when Capt. Fernandez [PNF] disengaged his Flight Director 21 seconds prior to the crash, the speed mode would have been activated and engine power would have started building up from that instant to restore the speed and the accident could have possibly been averted." (page 61)
    Issue: mode selection may be incorrect (Issue #145) See Issue details
    Strength: +2
    Aircraft: A320
    Equipment: autoflight

  5.  
  6. Evidence Type: Excerpt from Accident Report
    Evidence: "3 FINDINGS ... 19. Basically alpha floor functioning is built as a protection against wind shear, but the pilots seem to be under the impression that the protection from this system will be available to increase power of the engines in any emergency without any time delay and a false sense of faith has been reposed on this system." (page 39)
    Issue: pilots may be overconfident in automation (Issue #131) See Issue details
    Strength: +1
    Aircraft: A320
    Equipment: automation
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