Fluid mechanics

October 16, 2007 - 6:49am

Emergency AD 2003-08-52 was issued last month for the GE CT7-9B turboprop in response to 12 compressor-stall events in Saab 340Bs over a six-month period. The stalls occurred when pilots throttled back from takeoff power to climb power. Nine of the events involved engines that had the compressor variable geometry (VG) rigged to N1, one of two allowable rigging options that affords slightly higher performance at the expense of stall margin.

October 12, 2007 - 10:40am

Miami-based Quiet Technologies Aerospace in late January received FAA approval of its Stage 3 translating-ejector hush kit for Gulfstream IIs, IIBs and IIIs.

October 3, 2007 - 8:00am

AvAero, a maker of Learjet hush kits, has received an STC for a fuel-saving aerodynamic modification of the Boeing 737-200/300. The company claims the mod will decrease the twinjet’s fuel burn by an average of 4 percent, equating to about a 230-pph fuel-burn reduction. By repositioning the trailing-edge flaps, AvAero said it increases aft wing camber, which lets the airfoil generate the same lift at a lower angle of attack.

September 26, 2007 - 11:15am

Pratt & Whitney Canada’s new PW535E turbofan engine for the Embraer Phenom 300 has reached its full takeoff thrust of 3,360 pounds at the company’s Longueuil, Quebec test facility. Embraer chose the PW535E turbofan in May 2005 to power the Phenom 300.

September 26, 2007 - 10:37am

The FAA has issued an airworthiness directive (AD) for the Eurocopter AS 350B/BA/B1/B2/B3/D and AS 355E Squirrel light helicopters, requiring replacement of the hydraulic fluid at a specified interval when operating in cold weather. The amendment is prompted by reports of ice forming due to condensation in some parts of the hydraulic system.

September 20, 2007 - 10:56am

Despite having lost out to Rolls-Royce in the competition to power Dassault’s still-under-wraps super-midsize Falcon, Snecma is moving ahead with development its Silvercrest engine for business jets. The French manufacturer (Booth No. 824) is here exhibiting a full-size mockup of the 10,000-pound-thrust-class turbofan.

September 18, 2007 - 12:03pm

Snecma plans to unveil a mock-up of its 9,500- to 12,000-pound-thrust Silvercrest engine, as well as divulge more details about the project, at the NBAA Convention in Atlanta next week. The French engine manufacturer also confirmed that it will run a Silvercrest core engine in the fourth quarter.

June 12, 2007 - 7:18am

The Franco-Russian Powerjet SaM146 turbofan engine, which is to power the Sukhoi Superjet 100 regional airliner, is set to fly by the end of this month. The first example of the 14,000- to 17,500-pound-thrust family made its first ground run in July 2006 at Rybinsk in Russia.

May 31, 2007 - 11:43am

Phoenix-based engine and avionics manufacturer Honeywell says its 10,000-pound-thrust engine contender is well under way. Ron Rich, the company’s director of advanced technologies, told AIN that parts for the company’s HTF10000 demonstrator have already been ordered, with the core engine expected to be operational by the end of next year.

May 4, 2007 - 10:59am

Snecma is progressing with its plans to develop a turbofan in the 10,000-pound-thrust class. Last October, the French manufacturer revealed plans to enter the business jet engine market. Design of the Silvercrest powerplant is well under way and the core should run later this year.

 
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