Trigana ATR-42 down in Indonesia

[Super VC-10]

Aviation Herald reporting an ATR-42 of Trigana Air Service made a forced landing in Bone, Indonesia following and in-flight engine failure. Aircraft was attempting to divert to Sepinggan Airport.

Accident: Trigana AT42 at Bone on Feb 11th 2010, forced landing on a field (http://avherald.com/h?article=427210a0&opt=0)

[GBV]

Pictures:

Pesawat Trigana Air Mendarat Darurat | KOMPAS images (http://images.kompas.com/photos/view/30200#photos/view/30200)

[aseanaero]

Without getting into the reasons why they had to force land it looks like landing with the gear up was a good decision.

[lomapaseo]

I read elsewhere the second engine also failed for unknown reasons during the divert. But the prop angles in the pictures seem to only show one feathered. ???

[FLEXPWR]

Seems the right engine not feathered...as previously mentioned, but it raises a lot of questions...

The only 2 ways to feather the prop on the ATR are with the fire handle (electric feathering pump) and the Condition Lever (Prop lever, using engine oil pressure) which has to go through the feather position before reaching the Fuel Shut Off position.

So, not drawing conclusions of course, but one option could be that the engine stopped working without any action from the crew, as it would stay in this unfeathered position if fuel were to stop flowing to the engine (acme screw prevents any major change in pitch in case of oil pressure loss).

Now we don't know which engine failed first, but if the right engine failed first and was not feathered, it's obvious the aircraft would not remain airborne for long. The prop in fine pitch will bring the aircraft down even with light weights. If the left engine failed first and was manually feathered by the crew, then they really had a bad day to have the second engine quit...

Anyway, great job in bringing the aircraft in one piece back to earth, and everyone is alive.

[wingview]

For what is worth:

An ATR-42-300 turboprop plane, registered PK-YRP, was damaged in a forced landing in a rice field near Balikpapan-Sepingan Airport (BPN), Indonesia.
The domestic passenger flight from Tanjung Redep/Berau-Kalimaru Airport (BEJ) was approaching Samarinda (SRI) when the nr.1 engine failed. Samrinda air traffic control advised against an emergency landing there because the airport is situated in a residential area. Also, the runway length is just 1160 m (3800 ft)
of the lentgh of the runway and the buildings surrounding the airport. The pilot decided to divert to Balikpapan-Sepingan Airport (BPN) which was 92 km (50 NM) to the South. En route to Balikpapan the nr.2 engine also lost power. The crew carried out a forced landing in a rice field, some five kilometers from the main road from Samarinda to Balikpapan.


How much rwy do they need for an emergency landing? Not sure what to think about diverting to an other field further away due to ATC advisory?

Lucky all to survived it!:ok:

Source: ASN Aircraft accident ATR-42-300 PK-YRP Balikpapan-Sepingan Airport (BPN) (http://aviation-safety.net/database/record.php?id=20100211-0)

[ClimbSequence]

The only 2 ways to feather the prop on the ATR are with the fire handle (electric feathering pump) and the Condition Lever (Prop lever, using engine oil pressure) which has to go through the feather position before reaching the Fuel Shut Off position.

There is another way. During T/O or Go around with the ATPCS armed and the TQ falls below 50 % aproximately on the engine, the propeller will automaticaly feather :)

[FLEXPWR]

Climb Sequence,

You are absolutely right :ok:, I did not mention this possibility since it appears the aircraft was already en route or on approach, i.e. ATPCS not armed.

The ATPCS uses the same electric feathering pump as the fire handle.
ATPCS triggered when TQ drops below 21% on ATR 42-300 (TO & GA only).

Flex

[Super VC-10]

I understand that the decision to divert was partly because of the longer runway, and partly due to the better facilities available.

Accident: Trigana AT42 at Bone on Feb 11th 2010, forced landing on a field, both engines not operating (http://avherald.com/h?article=427210a0&opt=0)