NTSB: Issues Helo Safety Recommendation(s) A-03-18-21 | Aero-News Network
Aero-News Network
RSS icon RSS feed
podcast icon MP3 podcast
Subscribe Aero-News e-mail Newsletter Subscribe

** Airborne 07.23.14--CLICK HERE! ** HD iPad-Friendly Version--Airborne 07.23.14 **
** Airborne 07.21.14--CLICK HERE! ** HD iPad-Friendly Version--Airborne 07.21.14 **
** Airborne 07.18.14--CLICK HERE! ** HD iPad-Friendly Version--Airborne 07.18.14 **

Wed, May 28, 2003

NTSB: Issues Helo Safety Recommendation(s) A-03-18-21

The NTSB recommends that the FAA:

Issue a flight standards information bulletin (FSIB) informing operators and pilots of single-engine helicopters equipped with Rolls-Royce Model 250 series IV engines of the circumstances of this accident and indicating that a potential fault with the full authority digital electronic control system may cause a sudden, uncommanded decrease of engine power without any identified cockpit indication or warning. The FSIB should also note that switching to manual mode may correct the engine power problem but that recovery to full power may take 2 to 6 seconds, thus possibly precluding a successful recovery to normal flight while operating in those altitude/airspeed combinations under which a safe autorotational landing is not probable. (A-03-18)

Require the manufacturer of the full authority digital electronic control system installed on helicopters equipped with Rolls-Royce Model 250 series IV engines to modify the system such that an erroneous or erratic in-range potentiometer throttle position angle signal will not cause an uncommanded increase or decrease in fuel flow, which could result in a drastic reduction in engine power. (A-03-19)

Prohibit the operators of single-engine helicopters equipped with Rolls-Royce Model 250 series IV engines from operating in those altitude/airspeed combinations under which a safe autorotational landing is not probable until it is shown that the operation of these engines provides an adequate margin of safety. (A-03-20)

Require, on an expedited basis, that the on-aircraft test procedure developed by Rolls-Royce to identify faulty potentiometers be performed, on a repetitive basis at a conservative interval, on all Bell 407, MD-600, and OH-58 helicopters to determine if the potentiometer contained in the hydromechanical unit (HMU) is working properly. HMUs with faulty potentiometers should be replaced. (A-03-21)

FMI: www.ntsb.gov/Recs/letters/2003/A03_18_21.pdf

Advertisement

More News

Trig Avionics Announces New ADS-B Out Solution

TN70 WAAS GPS Receiver Optimized For Use With Other Trig Avionics Trig Avionics is introducing its new TN70 WAAS GPS with companion Antenna, optimized for use with Trig products.>[...]

ANN's Daily Aero-Linx (07.25.14)

Aviation Digital Data Service The Aviation Digital Data Service (ADDS) makes available to the aviation community text, digital and graphical forecasts, analyses, and observations o>[...]

ANN's Daily Aero-Term (07.25.14): Pitch Point

A fix/waypoint that serves as a transition point from a departure procedure or the low altitude ground-based navigation structure into the high altitude waypoint system.>[...]

Aero-News: Quote Of The Day (07.25.14)

"The final rule is now planned for, I think its December of 2017. That is later than the statute, which calls for a final rule by the end of 2015." Source: FAA's Associate Administ>[...]

ANN FAQ: Disqus

A Powerful New Tool For You To Use For Your Aero-Conversations Want to start a conversation about a story you've seen on Aero-News? It's even easier with Disqus, a powerful, web-ba>[...]

blog comments powered by Disqus



Advertisement

Advertisement

Podcasts

Advertisement

© 2007 - 2014 Web Development & Design by Pauli Systems, LC