Air India Flight 855: 1978 Boeing 747 Crash into the Arabian Sea

Flight and aircraft details

The flight departed at night, and the crew encountered an unusual flight instrument indication soon after climbout. Contemporary reports and the official inquiry describe a sudden loss of reliable attitude information for the captain. The airplane entered an unrecognized descent and impacted the sea a few minutes later.

Investigation and causes

Investigators examined cockpit instruments, crew actions and maintenance records. The formal findings attributed the accident chiefly to spatial disorientation and pilot error after a primary attitude indicator malfunction, compounded by insufficient cross‑checking of instruments by the flight crew. Weather and air traffic control were not identified as primary causes.

Consequences and legacy

The accident prompted recommendations to improve instrument maintenance, pilot training in instrument failures and procedures for cross‑checking flight instruments. It also highlighted the dangers of spatial disorientation at night over water and contributed to broader emphasis on crew coordination and instrument redundancy in long‑range jet operations.

Notable facts

• The flight is frequently cited in discussions of attitude indicator failures and human factors in aviation safety.
• It underscores the importance of instrument scan discipline and immediate verification when warnings or abnormal indications occur.