Investigation Summary
The accident occurred during a night approach in low visibility and fog. The primary Instrument Landing System (ILS) for runway 16 was out of service for reconstruction, forcing the crew to perform a non-precision ASR (Airport Surveillance Radar) approach to runway 25. The approach was destabilized from the start when the radar controller turned the aircraft onto the final approach vector only 4.5 nautical miles from the runway, significantly closer than the recommended 8 nautical miles. This compressed the time available for the crew to configure the aircraft and perform necessary checks. During the descent, the First Officer failed to make required altitude callouts, relying on an internal sense of timing that was inaccurate due to the steep descent. When the GPWS 'whooper' alarm sounded, the First Officer misread his altimeter as 1,500 feet when the aircraft was actually at 500 feet. Based on this misidentification, the Flight Engineer physically silenced the alarm using the override switch. The crew continued the descent until impacting the bay. The aircraft came to rest in approximately 12 feet of water. The evacuation was hampered by the fact that the flight was not classified as an 'extended overwater flight,' meaning passengers had not been briefed on the location or use of life vests, and the seat cushions were not designed for flotation. Survival for many was credited to the immediate assistance of the tugboat 'Baycon' and its barge, which were operating nearby and rescued survivors from the water.
Final Conclusions
The NTSB determined the probable cause was the flight crew's unprofessionally conducted non-precision instrument approach. The crew failed to monitor descent rate and altitude, and the First Officer failed to provide required callouts. A critical factor was the Captain's failure to respond to the GPWS warning and the Flight Engineer's action of silencing the warning without the Captain's consent. The radar controller's failure to provide adequate advance notice of the descent point was cited as a contributing factor, as it accelerated the pace of cockpit activities and led to a rushed environment.
Photographic Evidence (1)
Video Analysis
Deadly Rush | National Airlines Flight 193 — An analysis of the 1978 crash of National Airlines Flight 193 into Escambia Bay, focusing on the crew's loss of situational awareness and the failure of CRM during a rushed approach.
If playback is blocked, the owner has disabled embedding — use the link above.
Airframe & Maintenance
Crew Experience
Captain
Age 55, with National Airlines since 1956.
First Officer
Age 31, with National Airlines since 1976.
Flight Engineer
Age 47, with National Airlines since 1969.
Systems & Failure Modes
GPWS
The Ground Proximity Warning System provided an auditory warning that was silenced by the Flight Engineer after the First Officer misread the altimeter as 1,500 feet.
ASR Approach
A non-precision radar approach where the controller provides lateral guidance, but the pilot is responsible for maintaining vertical clearance.
Flotation Equipment
The aircraft lacked approved flotation-type seat cushions; many passengers attempted to use standard cushions which failed to provide buoyancy.
Interesting Facts
- 01The aircraft was a Boeing 727-235 named 'Donna'.
- 02Three passengers drowned while attempting to evacuate the partially submerged aircraft.
- 03The flight was not required to carry life rafts or flotation seat cushions because it was not an extended overwater flight.
- 04The ILS for the primary runway was out of service, necessitating a non-precision approach.
- 05The aircraft was written off due to extensive seawater corrosion despite remaining structurally intact.
Safety Actions & Advisories
Flotation Equipment Regulations
Regulations regarding the requirement for flotation devices and passenger briefings were subsequently changed to ensure better preparedness for water landings, even on non-extended overwater routes.