Industri Pesawat Terbang Nusantara (IPTN) N-250

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Industri Pesawat Terbang Nusantara (IPTN) N-250 (Indonesia)

The IPTN N-250 was a regional aircraft commuter turboprop. It was an original design by the Indonesian firm IPTN (now Indonesian Aerospace - IAe), N letter stood for Nurtanio (Nurtanio Pringgoadisuryo, one of the first aviation pioneers in Indonesia ) and the 250 denoted twin engine aircraft with 50 passengers capacity. The driving force behind the project was politician B.J. Habibie who was to become a director of IPTN.

This aircraft was IPTN's effort to win the market share of 50-70 class passengers with advantages in its class (when it was launched in 1995) and was seen as a rival to the Fokker 50.

The N250 was first introduced in 1986 at the Indonesian Air Show in 1986. A revised N-250 project was announced by PT IPTN (now PT Dirgantara Indonesia,Indonesian Aerospace) at the Paris Air Show in 1989.

The aircraft prototype would be flown with the latest technology including fly-by-wire. The first prototype (c/n PA 1) flew on August 10, 1995. The second prototype (c/n PA 2) was planned to have a first flight at May 1996, but because of problems, the PA-2 was first flown on December 19,1996 in the 70-seat configuration. The third prototype and fourth prototype was planned to fly in July 1996 and September 1996.

The first 50-seat prototype was named "Gatotkaca" after a character from "Mahābhārata" (one of the two major Sanskrit epics of ancient India). The Second Prototype was named "Krincing Wesi". Third and Fourth prototype was planned to use the "Putut Guritno" and "Koco Negoro" names. Despite being exhibited at the 1996 Indonesian Air Show in Cengkareng and some local South-East Asia commercial interest shown, the entire project was cancelled after the Asian financial crisis of 1997 with only the first two examples being constructed.

After over a dozen years, the N-250 program was being considered to be rebuilt by B.J. Habibie (by now no longer a director of IPTN) after getting approval from the President Susilo Bambang Yudhoyono. However, to reduce production costs and improve price competitiveness in international markets, changes were made which would have reduced the performance such as a reduction in engine capacity, and removal of the fly-by-wire system. However, in August 2012, both parties Erry Firmansyah, PT Eagle Cap and both sons of Habibie from PT il Thabie announced an agreement to finance N-250 production.

The aircraft used a pair of 2,439 Kw Allison AE 2100C turboprop engines. With 6 bladed-propellers, it was able to fly with maximum speed of 610 km/h (330 m/ph) and an economic speed of 555 km/h which was, at the time of initial development, the highest speed in the 50 passenger turboprop class.

It had an operating altitude of 25,000 feet (7620 meters) with a cruising range 1480 km.

This aircraft planned to be available in two versions:

- N250-50 with 50 passengers capacity. This was the configuration of the N-250 first prototype c/n PA-1 (PK-XNG) . First flight 10th August 1995.

- N250-100 with 70 passengers capacity. This second example was previously named in the press as the N-270. Represented as N-250 second prototype c/n PA-2 (PK-XNK). This was the version that would became the variant that would be launched to market. First flight 19th December 1996.

There was a Janes all the Worlds Aircraft entry in 1995-1996.

An associated offering from IPTN was the IPTN-2130 jet airliner which flew in 1995 (see http://www.secretprojects.co.uk/forum/index.php/topic,4405.msg34938.html#msg34938).

Has anyone any ides whether the plans to restart the N-250 project has come to anything?

Images:

First example layout
Second Example layout
Second prototype take off.

Sources:
Flight International 19-25 June 1994-1998
Jane's All The World's Aircraft 1995-96
Various IPTN press releases
 

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Stargazer2006

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Still have the whole press kit from way back then. I guess there must have been too many similar aircraft types on the market already, the ATR family being the one that comes to mind at the moment.
 

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