After losing both engines and all electrical power in a violent storm, the pilots of Garuda Indonesia Flight 421 manage a remarkable emergency landing.
Garuda Indonesia Flight 421 was a scheduled domestic flight operated by Indonesian flag carrier Garuda Indonesia travelling about 625 km (388 mi; 337 nmi) from Ampenan to Yogyakarta. On January 16, 2002, the flight encountered severe thunderstorm activity during approach to its destination, suffered flameout in both engines, and ditched in a shallow river, resulting in one fatality and several injuries.
Garuda Indonesia Flight 421 was a scheduled domestic flight operated by Indonesian flag carrier Garuda Indonesia travelling about 625 km (388 mi; 337 nmi) from Ampenan to Yogyakarta. On January 16, 2002, the flight encountered severe thunderstorm activity during approach to its destination, suffered flameout in both engines, and ditched in a shallow river, resulting in one fatality and several injuries
Accident
As the Boeing 737-300 aircraft was on approach to its destination, the pilots were confronted with substantial thunderstorm activity visible ahead and on their onboard weather radar. They attempted to fly between two intense weather cells visible on their radar. They later entered a thunderstorm containing heavy rain and hail. About 90 seconds later, as the aircraft was descending through 19,000 ft (5,800 m), both CFM International CFM56 engines experienced a flameout, which resulted in the loss of all generated electrical power. Both engines were set at their flight-idle power setting before flameout occurred. The crew tried unsuccessfully to restart the engines two or three times. They then tried but failed to start the auxiliary power unit (APU), at which time total electrical power loss occurred. (During the later investigation, the NiCd battery was found to have been in poor condition due to inadequate maintenance procedures.) First Officer Gunawan attempted to transmit a Mayday call, but was unable to. As the aircraft descended through the lower layer of clouds at approximately 8,000 ft (2,400 m), the pilots saw the Bengawan Solo River and decided to attempt to ditch in the river with the flaps and gear retracted. The ditch procedure was successful, leaving the aircraft settled down on its belly in the shallow water, with the fuselage, wings and control surfaces largely intact. There was no fire.
NTSC investigation and report
The final report of the Indonesian National Transportation Safety Committee (NTSC) notes that pilot training in the interpretation of weather radar images was not formal, being given only during flight training. It is considered possible that the precipitation was so dense that it attenuated the radar signals, reducing the reflections that usually indicate precipitation and making such high density appear to be a clearer path. Had the crew manipulated the radar tilt to sweep the ground during descent, they would have been aware of the risks associated with the chosen flight path. Intense noise audible in data from the cockpit voice recorder as well as damage to the nose radome and engines indicate the presence of hail with the rain. The report concludes that the hail/water density exceeded the engine tolerance at flight idle, resulting in flameout.[
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