LSA Inflight adjustable propellers

[jon123]

Please note the revised ASTM F2506-13 includes inflight adjustable propellers. See section 1.1.1 below

 

“ASTM F2506

 

Abstract

 

This specification covers the establishment of the minimum requirements for the design, testing, and quality assurance of fixed-pitch or ground adjustable propellers for light sport aircraft. The propeller may not have design features that have been shown to be hazardous or unreliable unless the suitability of each questionable design detail or part can be established by tests. Strength testing; stress measurement, fatigue strength, and fatigue analysis, endurance testing, and teardown inspection shall be performed to meet the requirements prescribed.

 

This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

 

1. Scope

 

1.1 This specification covers the establishment of the minimum requirements for the design, testing, and quality assurance of fixed-pitch or ground adjustable propellers for light sport aircraft. These propellers are used on light aircraft, and could be used with engines conforming to Practice F2339.

 

1.1.1 When applying the additions provided in Appendix X1, this specification also covers the establishment of the minimum requirements for the design, testing and quality assurance of in-flight adjustable propellers for light-sport aircraft.

 

1.2 This specification is intended for use by manufacturers of propellers for light sport aircraft.

 

1.3 This specification does not address the airframe installation requirements for propellers.

 

1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and to determine the applicability of regulatory limitations prior to use.

 

2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

 

ASTM Standards

 

F2339 Practice for Design and Manufacture of Reciprocating Spark Ignition Engines for Light Sport Aircraft

 

Keywords

 

light sport aircraft; propeller;

 

ICS Code

 

ICS Number Code 49.050 (Aerospace engines and propulsion systems)

 

DOI: 10.1520/F2506

 

ASTM International is a member of CrossRef.

 

ASTM F2506”

 

 

[pylon500]

It is interesting to note that if you try to chase up this information, through the crowd calling themselves ASTM International;

 

http://www.astm.org/Standards/F2506.htm

 

They expect you to pay to find out what the requirements are.

 

Bare in mind that this 'ASTM International' is really just an American body telling everyone around the world how they should do stuff.

 

Does this imply that all our governing bodies are letting a private company dictate what our standards are to be with no question or debate?

 

Looking at the following .pdf;

 

http://www.easa.europa.eu/agency-measures/docs/certification-specifications/CS-LSA/CS-LSA%20-%20Initial%20Issue.pdf

 

On page 1-J-1 is a layout of recent changes to the original standards, but no complete original standards.

 

There may be a glimmer of hope for people with inflight adjustable LSA's in this CASA discussion;

 

http://www.ptaaus.com.au/2013/10/28/lsas-and-astm-f2506-13-an-email-string-from-casa/

 

And to a lesser degree comments made on the RAAus site;

 

http://www.raa.asn.au/2013/09/in-flight-adjustable-props-on-lsas/

 

Obviously the link on the above site only takes you back to the 'pay for' site at the top.

 

Nowhere in what you CAN actually read, is there any reference to the concept of 'Safe History of Operation'.

 

So the search goes on...

 

 

[djpacro]

They expect you to pay to find out what the requirements are.

Bare in mind that this 'ASTM International' is really just an American body telling everyone around the world how they should do stuff.

 

Does this imply that all our governing bodies are letting a private company dictate what our standards are to be with no question or debate? ..

Nope to all.

They are not telling everyone around the world anything - people around the world choose to use their standards only if they want to.

 

Our governing bodies can propose changes to the standards.

 

They are not a charity.

 

 

[winsor68]

Nope to all.They are not telling everyone around the world anything - people around the world choose to use their standards only if they want to.

Our governing bodies can propose changes to the standards.

 

They are not a charity.

Well actually...they are a charity...only we pay them.

 

 

[djpacro]

Well actually...they are a charity...only we pay them.

I guess that if you need this standard that you design and manufacture propellers? Do you give them away?

[David Isaac]

I guess that if you need this standard that you design and manufacture propellers? Do you give them away?

Not in the world that I live in .... Standards are costly to develop and all Standards bodies world wide charge for their publications. Regulations may be free of charge in some jurisdictions, but NOT standards.