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AIRCRAFT COMPARATIVE ANALYSIS - GULFSTREAM G100

Gulfstream G100


A look at the $6.3 - $8m pre-owned price range.

In this month’s Aircraft Comparative Analysis- we provide information on a selection of Pre-Owned business jets in the $6.3m-$8m range for the purpose of valuing the pre-owned Gulfstream G100. Here- we’ll discover whether a Gulfstream G100 can successfully compete against aircraft with greater cabin volume.

Below- we will weigh some of the important productivity parameters - including payload/range- speed and cabin size - and cover current and future market values. The field for this study includes Bombardier’s Learjet 60- and Cessna’s Citation VII and Excel aircraft.

BRIEF HISTORY
On May 1- 2001 General Dynamics (GD) announced the acquisition of Galaxy Aerospace Company from Israel Aerospace Industries Ltd. (IAI) which included the type certificates for the entire family of aircraft. When the deal closed- GD placed the entire family of aircraft with Gulfstream- which it had acquired in 1999.

General Dynamics chose to rename the Astra and Galaxy models the Gulfstream G100 and G200 respectively. All pre-owned Westwind and Astra models would be referred to as the Gulfstream Westwind and Astra models. IAI would continue to manufacture the G100 and G200 aircraft in Israel and fly the aircraft for interior completion to Gulfstream in the US.

The 1125 Astra aircraft first flew on March 19- 1984- receiving type design approval on August 29- 1985. From airframe serial number 42- the 1125 Astra took the identity of ‘Astra SP’ - and offered improved range and speed- a new Rockwell Collins autopilot and electronic flight information system (EFIS)- and was powered by two TFE 731-3C-200G turbofan engines.

The 1125 Astra SPX is a continuation of the 1125 Astra SP design with higher-powered engines (TFE 731-40R)- modified wings and winglets- enabling it to fly faster- higher and further than the 1125 Astra SP. Starting with S/N137- aircraft designation is the G100 aircraft. Table A (top left) shows the years of manufacture- total built and total in-operation for each stage of the model’s evolution.

PAYLOAD AND RANGE
The data contained in Table B (left) is published in the Business & Commercial Aviation (B&CA) May 2009 issue- but is also sourced from Conklin & de Decker. As we mentioned in past articles- a potential operator should focus on payload capability as a key factor. The Gulfstream G100 ‘Available payload with Maximum Fuel’ at 920 pounds has the lowest payload capability in this field of study.

CABIN VOLUME
According to Conklin & de Decker- the cabin volume of the Gulfstream G100- at 375 cubic feet- is smaller than all the aircraft in this field of comparison- as shown in Chart A (left). The Cessna Citation Excel has the greatest cabin volume at 461 cubic feet (12.2% more cabin space than the G100).

POWERPLANT DETAILS
As mentioned- the Gulfstream G100 is powered by a pair of Honeywell TFE 731-40R engines each offering 4-250 pounds of thrust. The Learjet 60 - enjoying 4-600 lbst from its P&WC PW305A engines - leads all competitors in this field of comparison. The remaining two aircraft in the field- the Citation VII at 4-080 lbst and the Citation Excel at 3-804 lbst- are each powered with less thrust than the G100.

Using data published in the May 2009 B&CA Planning and Purchasing Handbook- and the August 2009 B&CA Operations Planning Guide we will compare our aircraft operating cost. The nationwide (US) average Jet A fuel cost published in the August 2009 B&CA Operations Planning Guide was $4.25 per gallon- so for the sake of comparison we’ll chart the numbers as published.

COST PER MILE COMPARISONS
Chart B (bottom- left)- which details ‘Cost per Mile’- compares the G100 to its competition factoring direct costs and with all aircraft flying a 1-000nm mission with an 8

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