2:26 PM, the pilot contacted Jakarta Approach controller
and requested for descent to 6,000 feet and subsequently
requested to make a right turn was approved by Jakarta
At 2:32 PM the aircraft
impacted a ridge of Mount Salak on 28 NM HLM VOR on
radial 198 at approximately 6,000 feet ASL. 38 seconds
prior to impact, the Terrain Awareness Warning System
(TAWS) audio warning “TERRAIN AHEAD, PULL UP” activated
once and “AVOID TERRAIN” activated 6 times.
The PIC inhibited the TAWS system assuming that the
warning was a problem on the database. Seven seconds
prior to impact, the flight warning system “LANDING GEAR
NOT DOWN” activated.
At 2:50 PM the Jakarta
Approach controller on duty noticed that the flight
target disappeared on the radar monitor. There was no
alert on the Jakarta Radar system prior to the
disappearance of the target.
May 10, 2012, the location of the aircraft was
identified by the Search and Rescue helicopter pilot.
All occupants were fatally injured and aircraft was
destroyed. The Cockpit Voice Recorder (CVR) was found on
May 15, 2012. The memory module was in good condition
and contained 2 hours of good quality recording.
The Flight Data Recorder (FDR) was found on May 31,
2012. It contained 471 parameters of 150 hours recording
time. Both recorders were downloaded in the NTSC
facility by the NTSC experts and were assisted by the
Russian experts. A simulation test suggested that a
recovery action might have avoided the collision with
terrain up to 24 seconds after the first TAWS warning.
Jakarta Radar Services had not established a minimum
altitude for vectoring aircraft for certain areas and
the Minimum Safe Altitude Warning (MSAW) did not provide
warnings to the Jakarta Approach controller before the
concluded that the factors contributing to this accident
were the crew was not aware of the mountainous area
surrounding the flight path due to various factors
resulting in disregarding the TAWS warning. The Jakarta
Radar service had not established the minimum vectoring
altitudes and the system was not equipped with
functioning MSAW for the particular area surrounding
Distraction to the flight crew from prolonged
conversation not related to the progress of the flight
resulted in the pilot flying did not continue to change
the aircraft heading while in orbit. Consequently, the
aircraft unintentionally exited the orbit.
NTSC issued Immediate Recommendation and several Safety
Recommendations to the Indonesia Directorate General of
Civil Aviation (DGCA), Soekarno Hatta International
Airport International Airport, Department of Aviation
Industry the Ministry of Trade and Industry of Russia
and Sukhoi Civil Aircraft Company of Russian Federation.