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Accident
Last updated: 22 October 2017
Status:Voorlopig
Datum:woensdag 16 januari 2002
Tijd:16:29
Type:Silhouette image of generic B733 model; specific model in this crash may look slightly different
Boeing 737-3Q8
Luchtvaartmaatschappij:Garuda Indonesia Airways
Registratie: PK-GWA
Constructienummer: 24403/1706
Bouwjaar: 1989-04-07 (12 years 10 months)
Aantal vlieguren:27701
Aantal vluchten:24139
Motoren: 2 CFMI CFM56-3B1
Bemanning:slachtoffers: 1 / inzittenden: 6
Passagiers:slachtoffers: 0 / inzittenden: 54
Totaal:slachtoffers: 1 / inzittenden: 60
Schade: Afgeschreven
Gevolgen: Written off (damaged beyond repair)
Plaats:22,5 km (14.1 mijl) W of Yokyakarta (   IndonesiŽ)
Fase: Nadering (APR)
Soort vlucht:Binnenlandse lijnvlucht
Vliegveld van vertrek:Mataram-Selaparang Airport (AMI/WADA), IndonesiŽ
Vliegveld van aankomst:Yogyakarta-Adisutjipto Airport (JOG/WARJ), IndonesiŽ
Vluchtnummer:GA421
Beschrijving:
Flight 421 departed Mataram around 15:00 and climbed to the cruising altitude of FL310. During the initial descent the crew decided to deviate from the planned route because of thunderstorms along their planned route. At 16:19 the flight encountered an area of severe turbulence and thunderstorm activity with extremely heavy precipitation and hail. The crew attempted to fly towards a gap between two storm cells. About 90 seconds after entering the thunderstorm, as the airplane descended through about FL180 at a flight idle power setting, both engines flamed out. The crew carried out three unsuccessful attempts to restart the engines followed by one unsuccessful attempt to start the auxiliary power unit (APU). The flight crewís reported actions to restart the engines and APU however, were contrary to the procedures contained in the Boeing 737 Operations Manual. For instance, they waited only about 1 minute between each restart attempt instead of three minutes.
As the airplane descended below an overcast cloud layer at about 8,000 feet, the crew observed the Bengawan Solo River and decided to attempt to ditch the airplane into the river with flaps and landing gear in a shallow, 1 metre deep part of the river. One stewardess did not survive the crash.
Similar occurrences (Boeing 737-300 double engine flameout while descending in heavy precipitation with engines at flight idle) happened May 24, 1988 and July 26, 1988. Following these incidents OMB 88-5 and AD 6-14-88 were issued to require minimum rpm of 45% and to restrict the use of autothrust in moderate/heavy precipitation; engine modification was provided for increased capacity of water ingestion.

Bronnen:
» Flight International
» Jakarta Post
» NTSB


Veiligheidsmaatregelen

NTSB issued 2 Safety Recommendations

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Kaart
Deze kaart geeft het vliegveld van vetrek weer en de geplande bestemming van de vlucht. De lijn tussen de vliegvelden geeft niet de exacte vliegroute weer.
De afstand tussen Mataram-Selaparang Airport en Yogyakarta-Adisutjipto Airport bedraagt 626 km (392 miles).
Accident location: Global; accuracy within tens or hundreds of kilometers.

This information is not presented as the Flight Safety Foundation or the Aviation Safety Networkís opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.
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