Owner/operators of Bell 206L series helicopters can install a new cylinder extension assembly from Tactair Fluid Controls, a subsidiary of Young & Franklin. The new cylinder extension assembly is detailed in a Tactair service bulletin (SB42C42642-67-04) and a Bell Helicopter information letter (206L-14-97), and its replacement is recommended for accomplishment during repair or overhaul of the hydraulic servo actuator. The improvement replaces the existing cylinder extension assembly with an upgraded component that is designed to increase the reliability and service life of the entire hydraulic servo actuator.
When Brad Pedersen assumed the title of president and CEO of hoist and winch manufacturer Breeze-Eastern (Booth C4016) last June, he found a company that–despite celebrating a record sales year in fiscal year 2012–needed some guidance about how to properly assist customers in the field.
As a component and subsystem player in the fluid power and motion control market Tactair Fluid Controls (Booth No. 1510) is in a unique position to view the state of the aerospace industry. Tactair has a contract from Sumitomo Precision Products to design and manufacture the complete hydraulic package for the landing gear extension and retraction and steering control systems for the Mitsubishi MRJ.
A proposed AD that would require replacing the horizontal stabilizer trim actuator (HSTA) every 18 months on Citation 650s is based on a discovery in lab tests that the no-back friction brake within the HSTA “can degrade and allow the actuator to move without a command if an electrical failure is also present,” according to Cessna. At press time, the manufacturer said it had not received any reports of this condition in the field.
Bental Industries has introduced a new member of its family of rotary servo actuators. The RSA-06 unit delivers up to 9.6 pounds per foot of torque at a stroke of +/- 45 degrees. The Israeli group’s RSA actuators are used for functions such as flap controls on small unmanned aerial vehicles. They provide an extremely low power-to-weight/size ratio.
An emergency AD requires certain Learjet 45 horizontal stabilizer actuator assemblies to be replaced with new assemblies before further flight. The directive (AD 2003-06-51) was issued March 20 after a Learjet 45 in Australia reported a severe vibration followed by a rapid nose-down pitch. Investigation revealed that the acme screw–the primary load path of the actuator–was fractured, and the backup assembly had failed.
An ongoing investigation into the August 10 fatal crash of an S-76C+ in the Baltic Sea has led the NTSB to ask the FAA to take “urgent” action on several recommendations. Flight-data recordings show that the twin-turbine helicopter “pitched up and rolled to the left, followed by a series of rotations to the right before striking the water,” killing all 14 aboard.
A new pitch actuator will be required in some 330 U.S.-registered Pilatus PC-12s if the FAA adopts a proposed AD. The directive will require certain flap and autopilot limitations until the new actuator is installed. Pilatus reports the new actuator, which removes the flap-in-motion signal to the autopilot, is designed to prevent an abrupt nose-down pitch when the autopilot is disengaged while the flaps are at a 40-degree setting.
The FAA has issued a Special Airworthiness Information Bulletin for certain Beech King Air F90/100/200s and Beech 99s. It details recent failures of main landing gear actuator nut assemblies (part numbers GMD115-810029-17 and -23) built by General Machine-Diecron (GMD), of Griffin, Ga. The assembly isinstalled only in aircraft thathave electrical/mechanical mainlanding gear systems.