Fluid dynamics

October 1, 2012 - 9:00am

General Electric and Rolls-Royce tie for first place among turbofan manufacturers, each scoring an overall average of 8.0 for the quality of product support they provide their customers. Compared with last year, that score represented an improvement of 5 percent for GE and 1 percent for R-R.

September 10, 2012 - 2:10pm

The FAA issued an ADDocket FAA-2012-0222– on September 6 for some versions of the Eurocopter AS350. The directive, which is effective from October 11 this year, was issued after an in-flight fire caused by the ignition of hydraulic fluid leaking from a damaged forward servo-control hydraulic hose. The AD is intended to prevent the forward servo-control hydraulic hoses from becoming damaged and leaking hydraulic fluid that could ignite in flight.

September 4, 2012 - 3:40pm

The transonic speed spat between Cessna’s Citation Ten and Gulfstream’s G650 is likely to hit of the stops at Mach 0.95 when it encounters not “the sound barrier” but required safety margins. With the Ten’s top speed now pegged at Mach 0.935, Gulfstream’s G650 could thus leapfrog the Ten only slightly, if the Savannah-based aircraft manufacturer even chooses to do so.

July 9, 2012 - 6:45pm

Canada’s National Research Council (NRC) has added new capabilities to its altitude icing wind tunnel (AIWT), such as simulating flights at 25,000 feet and the addition of hot air supply for models that use it for de-icing. The improvements will help NRC meet client demands for development and certification work recognized by regulators such as Europe’s EASA and the U.S. FAA.

July 8, 2012 - 2:30pm

Canyon Engineering Products (Hall 4 Stand F7) has developed a line of dual- or multiple-port manual rotary-select valves that enable aircraft operators to isolate hydraulic pressure, at up to 5,000 psi, from specific systems to permit aircraft ground maintenance. The company’s rudder isolation valve, operating with 7.92 U.S. gallons per minute flow rate at up to 7.25 psi differential pressure, has an overall weight of 1.05 pounds, while another product is a three-port, two-position valve to isolate nosewheel door actuators for servicing.

May 14, 2012 - 4:25pm

The FAA is adopting an Airworthiness Directive (AD 2012-08-11) for certain Bombardier Dash 8-400 turboprop aircraft, to alleviate potential landing gear issues. The problems were identified during testing, which showed that failure of a retract-port, flexible hose on the main-landing-gear actuator could result in excessive leakage of hydraulic fluid.

March 14, 2012 - 1:55pm

The FAA proposes to adopt a new airworthiness directive (AD) for certain Eurocopter AS350 helicopters. Prompted by an in-flight fire caused by ignition of hydraulic fluid leaking from a damaged forward (pitch) servo-control hydraulic hose, the proposed AD is intended to prevent the forward servo-control hydraulic hoses from becoming damaged and leaking hydraulic fluid that could ignite in flight, which can result in loss of main rotor control, power loss, structural damage, propagation of fire and subsequent loss of control of the helicopter.

February 15, 2012 - 12:45pm

Asiana Airlines has selected Pratt & Whitney’s fleet management program for three of its P&W-powered Boeing 777s, the engine manufacturer announced here at the Singapore Airshow. Eagle Services Asia, Pratt & Whitney Global Service Partners’ engine overhaul facility in Singapore, will be responsible for the six-year agreement, which provides for the maintenance of six PW4090 turbofans that power the aircraft.

January 31, 2012 - 3:05pm

University of Cambridge Professor Holger Babinsky has created a one-minute video to dispel the myth that an airplane wing generates lift because the airflow moving over the upper surface has a longer distance to travel and “needs to go faster to have the same transit time as the air traveling along the lower, flat surface.” What actually causes lift, he said, “is introducing a shape into the airflow, which curves the streamlines and introduces pressure changes–lower pressure on the upper surface and higher pressure on the lower surface.

December 13, 2011 - 1:38pm

The FAA has issued a proposed advisory circular that would, as a core principle, include “emphasis of ‘reduce angle of attack’ response as the primary response for stall events.” According to the proposed AC, “The primary goal of this proposed advisory circular is to provide training, testing and checking recommendat

 
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