Tue, Jun 23, 2020
AD 2020-11-01 Updates The Software Of Each PFCAS Remote Electronics Unit (REU), Which Includes An Improvement To The LVDT
The FAA is adopting a new airworthiness directive (AD) for certain Gulfstream Aerospace Corporation (Gulfstream) Model GVI airplanes.
This AD was prompted by a report that the primary flight control actuation system (PFCAS) linear variable displacement transducer (LVDT) mechanical disconnect monitor may not trigger the disconnect of the affected control surfaces as required in the event of a control surface failure. This AD requires updating the software of each PFCAS remote electronics unit (REU), which includes an improvement to the LVDT. The FAA is issuing this AD to address the unsafe condition on these products. This AD is effective July 27, 2020.
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 certain Gulfstream Aerospace Corporation (Gulfstream) Model GVI airplanes. The NPRM published in the Federal Register on December 16, 2019 (84 FR 68363). The NPRM was prompted by a report from Gulfstream that the PFCAS LVDT mechanical disconnect monitor may not trigger the disconnect of the affected control surfaces as required in the event of a control surface failure.
The Model GVI flight control computer actuator LVDT disconnect monitor should disable the control surface for ailerons, elevators, and rudder in the event that one of those control surfaces fails. Gulfstream developed an REU software update that provides improvements to the LVDT of the PFCAS, which addresses the LVDT disconnect monitor problem.
This condition, if not addressed, could lead to spoiler hard-over or loss of structural integrity due to excessive surface deflection and result in loss of control of the airplane. The NPRM proposed to require updating the software of each PFCAS REU, which includes an improvement to the LVDT. The FAA is issuing this AD to address the unsafe condition on these products.
More News
A Puff Of Smoke Came Out From The Top Of The Engine Cowling Followed By A Total Loss Of Engine Power On May 9, 2025, about 1020 mountain daylight time, an experimental amateur-buil>[...]
From 2022 (YouTube Edition): Jenny, I’ve Got Your Number... Among the magnificent antique aircraft on display at EAA’s AirVenture 2022 was a 1918 Curtiss Jenny painstak>[...]
Very High Frequency (VHF) The frequency band between 30 and 300 MHz. Portions of this band, 108 to 118 MHz, are used for certain NAVAIDs; 118 to 136 MHz are used for civil air/grou>[...]
“From approximately November 2021 through January 2022, Britton-Harr, acting on behalf of AeroVanti, entered into lease-purchase agreements for five Piaggio-manufactured airc>[...]
Microburst A small downburst with outbursts of damaging winds extending 2.5 miles or less. In spite of its small horizontal scale, an intense microburst could induce wind speeds as>[...]
NTSB Prelim: Lee Aviation LLC JA30 SuperStol
See All