Investigation Summary
The flight was at the edge of the DC-9-33CF's range for a non-stop New York to St. Maarten route. During the cruise, the crew descended to lower altitudes to avoid thunderstorms, which increased fuel consumption. Upon arrival, the weather was initially below landing minima, prompting a brief diversion toward San Juan before the crew was told conditions had improved. The captain then attempted three separate approaches to Runway 09 at Princess Juliana International Airport. The first two failed due to poor alignment in rain, and the third was aborted because the aircraft was too high. By the time the crew elected to divert to St. Thomas (later changing to the closer St. Croix), the fuel state was critical. Fuel gauges were reported as erratic; after observing a low reading of 850 pounds, the crew concluded it was an instrument error based on their previous calculations. When the low-pressure lights flickered, the captain realized ditching was inevitable. The ditching was performed with the landing gear retracted and 15 degrees of flaps, but the cabin was not properly prepared. The public address system was inoperative, and many passengers were not braced or buckled when the aircraft struck the water. The aircraft sank in 5,000 feet of water and was never recovered.
Final Conclusions
The NTSB determined the probable cause was fuel exhaustion resulting from continued, unsuccessful attempts to land at St. Maarten until insufficient fuel remained to reach an alternate airport. Contributing factors included reduced visibility in the approach zone due to unreported rain showers and a lack of crew coordination during the ditching phase. The investigation highlighted that survival rates would have been higher if the cabin had been properly warned and if the emergency life rafts had not been blocked by shifting galley equipment or inflated prematurely inside the cabin.
Video Analysis
A Desperate Crew and Their Awful Decisions - The Extraordinary Tale of ALM Flight 980 — A detailed look at the fuel management errors and weather challenges that led to the ditching of ALM Flight 980 in the Caribbean Sea.
If playback is blocked, the owner has disabled embedding — use the link above.
Airframe & Maintenance
Crew Experience
Captain
Balsey DeWitt, age 37.
First Officer
Harry Evans II, age 25.
Navigator
Hugh Hart, age 35.
Systems & Failure Modes
Fuel Totalizer
The crew noted the fuel gauges and totalizer became erratic during the final climb, leading them to initially doubt the low fuel state.
Public Address System
The system was inoperable, which the NTSB cited as a major safety deficiency, as it prevented the crew from giving a 'brace' command.
Seat Belts
The investigation found the metal-to-fabric seat belt design was prone to slipping under high impact forces, leading to a recommendation for metal-to-metal buckles.
Interesting Facts
- 01The aircraft was a Douglas DC-9-33CF leased by ALM from Overseas National Airways (ONA).
- 02The public address system was inoperative, preventing the pilots from effectively warning the passengers to brace.
- 03A 25-man life raft inflated inside the galley after impact, pinning the First Officer and blocking an exit.
- 04The aircraft sank in approximately 5,000 feet of water and was never recovered.
- 05Captain DeWitt was fired six weeks after the accident and never flew commercially again.
- 06Flight attendant Margareth Abraham was the only crew fatality and was posthumously honored by the naming of a plaza at Curacao International Airport.
Safety Actions & Advisories
Emergency Checklist Revision
The NTSB recommended adding 'warn passengers' as a specific item on emergency ditching checklists.
PA System Requirements
Recommended that passenger flights not be dispatched without a working public address system.
Seat Belt Design
Phased out metal-to-fabric seat belt designs in favor of more secure metal-to-metal assemblies.