J'ouvre finalement ce fil
Les boites noires ont été identifiées
Indonesian investigators have determined that the captain of a Sukhoi Superjet 100 inhibited the terrain-collision system, believing its alerts to be erroneous.
terrain-awareness system initially sounded 38s before the aircraft
struck the slope of Mount Salak on 9 May this year, killing all 45
occupants who were participating in a demonstration flight.
from the National Transportation Safety Committee found the crew had
requested a descent to 6,000ft and to fly a right-hand orbit. This was
"approved" by Jakarta air traffic control.
But the crew was
distracted by "prolonged conversation" which was unrelated to the
flight, says the NTSC, and the captain - who was flying - did not
continue to change the Superjet's heading during the orbit.
"Consequently, the aircraft unintentionally exited the orbit," it adds.
aircraft's terrain-awareness system started called "terrain ahead, pull
up" about 38s before the crash, while the alert "avoid terrain" sounded
But the NTSC says: "The [captain] inhibited the
[terrain-warning] system assuming that the warning was a problem on the
Seven seconds before the impact with the mountain the
aircraft's warning systems also alerted the pilot to the landing-gear
not being deployed.
Analysis by the NTSC suggests the aircraft might have been able to avoid the impact up to 24s after the initial terrain warning.
Superjet had been taking part in an Asian tour for potential customers,
and a customer representative had been seated in the cockpit with the
The aircraft departed Jakarta's Halim Perdanakusuma
airport at 14:20 local time, turning right to intercept radial 200 from
the airport's VOR beacon.
It climbed to 10,000ft en route for a
demonstration flight planned over Bogor but the NTSC points out that
available charts on board the aircraft "did not contain" information
relating to the Bogor area and the surrounding terrain.
investigators says the descent request to 6,000ft was transmitted about
6min after departure and the aircraft struck Mount Salak, at a height of
6,000ft, some 6min later.
Jakarta's radar service has not
established a minimum altitude for vectoring aircraft in certain areas,
says the inquiry, and its system was not equipped with functioning
minimum safe altitude warnings for the area surrounding Mount Salak.
adds: "The crew were not aware of the mountainous area surrounding the
flight path due to various factors, resulting in disregarding the