Throttle problem suspected in jet crash
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Indonesian investigators say that a malfunction of the auto-throttle system, which controls the thrust of a plane’s engines, may have led to the crash of a Sriwijaya Air jet
on Jan 9 that killed all 62 people on board
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Data shows left engine’s throttle lever moved backwards on its own while autopilot was engaged
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INDONESIA
JAVA SEA
Boeing 737-500
14.40: Contact lost
6km 3.5 miles

JAKARTA

14:36
Departs from
Soekarno-Hatta International Airport
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12,000
10,000
8,000
6,000
4,000
2,000
0 
Time: 14:35 14.36 :14:37 14:38 14:39 14:40 14:41

600
500
400
300
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FINAL MOMENTS OF FLIGHT SJ182

114.36: Plane takes off

14.39 (10,600ft): Air traffic control instructs pilot to climb to 13,000 feet in last recorded radio transmission

14.38 (8,150ft): Left throttle lever moves backward, reducing thrust in left engine. Right engine’s throttle remains unchanged. Plane starts rolling to left as pilot fights to regain control

Altitude
Speed

414.40 (10,900ft): 200 Auto-throttle disengaged.

Jet rolls to left more than 100 45 degrees as it starts diving

Both engines appear to have been functioning prior to crash 0

All times local (GMT+7)
Altitude (feet)
Speed (knots)
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Picture: Getty Images Sources: Indonesia’s National Transportation Safety Committee (KNKT), FlightRadar24 © GRAPHIC NEWS