Tue, Dec 29, 2020
AD 2020-26-13 Prompted By Seven Incidents Of Fatigue Cracks In The Horizontal Stabilizer Root Fitting
The FAA is adopting a new airworthiness directive (AD) for Sikorsky Aircraft Corporation (Sikorsky) Model S-92A helicopters.
This AD was prompted by seven incidents of fatigue cracks in the horizontal stabilizer root fitting FWD (forward root fitting). This AD requires establishing the life limit of certain part-numbered forward root fittings, establishing the life limit of certain part-numbered stabilizer strut fittings, repetitively inspecting certain parts, and depending on the inspection results, removing parts from service. The FAA is issuing this AD to address the unsafe condition on these products. This AD is effective February 1, 2021.
Supplementary Information: The FAA issued a notice of proposed rulemaking (NPRM) to amend 14 CFR part 39 by adding an AD that would apply to Sikorsky Model S-92A helicopters with certain part-numbered horizontal stabilizer assemblies (stabilizer assembly), certain part-numbered forward root fittings, or certain part-numbered stabilizer strut fittings installed. The NPRM published in the Federal Register on September 17, 2020 (85 FR 58007). The NPRM was prompted by seven incidents of fatigue cracks in forward root fittings. Fatigue cracking in a forward root fitting degrades the load path and increases the load on other assembly parts, particularly at the aft horizontal stabilizer attachment points.
The NPRM proposed to require establishing the life limit of certain part-numbered forward root fittings and certain part-numbered stabilizer strut fittings. The NPRM also proposed to require repetitively inspecting each stabilizer assembly attachment bolt and barrel nut set, each forward root fitting, each attachment fitting including the bolt holes and fastener holes, condition of the fasteners, and each attachment fitting mating surface. Depending on the inspection results, the NPRM proposed to require removing parts from service. Finally, the NPRM proposed to prohibit installing certain stabilizer assemblies on any helicopter. The FAA is issuing this AD to address the unsafe condition on these products.
More News
He Attempted To Restart The Engine Three Times. On The Third Restart Attempt, He Noticed That Flames Were Coming Out From The Right Wing Near The Fuel Cap Analysis: The pilot repor>[...]
Make Sure You NEVER Miss A New Story From Aero-News Network Do you ever feel like you never see posts from a certain person or page on Facebook or Instagram? Here’s how you c>[...]
From 2009 (YouTube Edition): Leading Air Show Performers Give Their Best Advice for Newcomers On December 6th through December 9th, the Paris Las Vegas Hotel hosted over 1,500 air >[...]
Aero Linx: NASA ASRS ASRS captures confidential reports, analyzes the resulting aviation safety data, and disseminates vital information to the aviation community. The ASRS is an i>[...]
“For our inaugural Pylon Racing Seminar in Roswell, we were thrilled to certify 60 pilots across our six closed-course pylon race classes. Not only did this year’s PRS >[...]
NTSB Final Report: Rutan Long-EZ
See All