AD: Sikorsky | Aero-News Network
Aero-News Network
RSS icon RSS feed
podcast icon MP3 podcast
Subscribe Aero-News e-mail Newsletter Subscribe

Airborne Unlimited -- Most Recent Daily Episodes

Episode Date

Airborne-Monday

Airborne-Tuesday

Airborne-Wednesday Airborne-Thursday

Airborne-Friday

Airborne On YouTube

Airborne-Unlimited-07.21.25

Airborne-Unlimited-07.22.25

AirborneUnlimited-07.23.25

Airborne-Unlimited-07.24.25

AirborneUnlimited-07.25.25

Thu, Dec 30, 2010

AD: Sikorsky

AD NUMBER: 2010-26-09

MANUFACTURER: Sikorsky Aircraft Corporation (Sikorsky) Model S76A, B, and C Helicopters
SUBJECT: Airworthiness Directive 2010-26-09

SUMMARY: This amendment supersedes an existing emergency airworthiness directive (EAD) for the specified Sikorsky model helicopters. The EAD requires inspecting the LITEF Attitude Heading and Reference System (AHRS) unit of the navigation system to determine if it is at a Mod Status "18.' If either AHRS unit is at Mod Status "18,' the EAD requires installing placards on the instrument panel to prohibit single pilot instrument flight rule (IFR) and single pilot night flight and reducing airspeeds to 120 knots indicated airspeed (KIAS) if both autopilots uncouple during instrument meteorological conditions (IMC) or night flight. The EAD also requires inserting minimum crew and airspeed limitations into the Limitations section of the applicable Rotorcraft Flight Manual (RFM) to limit the minimum flight crew to 2 pilots for night flight and IFR flight and to reduce airspeed to 120 KIAS if both autopilots uncouple during IMC or night flight. This amendment contains the same requirements but draws the appropriate distinctions between IFR and IMC as used in the intended operating limitations. Also, unlike the EAD, this AD states the airspeed must be reduced to 120 KIAS if both autopilots uncouple during IMC or night flight. Further, we are removing the limitation contained in the Active Temporary Revisions relating to pilots keeping their hands and feet near the flight controls. This AD was prompted by the need to supersede the EAD to state the distinction between IFR and IMC as used in the operating limitations and to reduce the airspeed to 120 KIAS if both autopilots uncouple during IMC or night flight. The actions specified by this AD are intended to implement operating limitations based on an anomaly in the AHRS related to the 26 volt AC inverter that could result in a decoupling of both autopilots and to prevent loss of control of the helicopter during IMC and during night flight.

FMI: http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgAD.nsf/0/E3D196A59E98CEB6862578070053FF60?OpenDocument

Advertisement

More News

ANN/Oshkosh Sponsor, Gleim Aviation, Is Ready To Teach You A Thing Or Two...

Come To Oshkosh, Get Educated by Gleim At Booth #1103-1105 Gleim Aviation, industry leader in aviation training materials, was founded in 1980 for one reason: Dr. Irvin N. Gleim lo>[...]

ANN Thanks Our Speedy Sponsor... Blackshape!!!

Check out Blackshape in Oshkosh Display #190 Situated in the Apulian Aerospace district in Monopoli, Italy, Blackshape embodies the epitome of Italian craftsmanship, style, and qua>[...]

Alpha Systems AOA Guides ANN Oshkosh Coverage

A Powerhouse In Aviation Safety Technology, Visit Alpha Systems AOA at Osh Display#3124-3125 Alpha systems AOA has been developing and integrating Angle of Attack systems for the l>[...]

Airborne-Flight Training 07.17.25: Dual Ignition C172, CFI-ATP Course, FAA Boss

Also: Adventure Pilot iFly EFB X7, Endorsements Made Easy, H55 B23 Energic, Kings & USAF Cessna’s long-running Skyhawk now features a solid-state dual electronic ignition>[...]

Airborne 07.24.25: Spirit SE-1!, H55 eFlyer, King Schools

Also: Centauri Aircraft Valkyrie, Meet the Admin, Night Airshow, Pelton Intv'w When we laid eyes on this critter, we fell in love… and then we learned the amazing story of t>[...]

blog comments powered by Disqus



Advertisement

Advertisement

Podcasts

Advertisement

© 2007 - 2025 Web Development & Design by Pauli Systems, LC