Tuesday, June 17, 2014

Aviation Authority Regulations

FAA Regulations for Aging Aircraft

As of November 2010 the major concern of Aging Aircraft was “widespread fatigue damage” (WFD). According to the FAA (Babbitt, 2010):

Fatigue damage to a metallic structure occurs when the structure is subjected to repeated loads, such as the pressurization and depressurization that occurs with every flight of an airplane. Over time this fatigue damage results in cracks in the structure, and the cracks may begin to grow together. Widespread fatigue damage is the simultaneous presence of fatigue cracks at multiple structural locations that are of sufficient size and density that the structure will no longer meet the residual strength requirements.

In the past to prevent this kind of damage the aircraft was supposed to be inspected regularly but due to accidents involving WFD this is no longer the case. Accidents involving AD’s created due to WFD will be discussed later in another blog post.

With the new rule involving WFD from aircraft aging two things are required as per Dorr & Duquette (2010):

  • Aircraft manufacturers and certification applicants are required to establish a number of flight cycles or hours a plane can operate and be free from WFD without additional inspections for fatigue. Manufacturers have between 18 and 60 months to comply depending on the particular aircraft type.
  • Once limits are established, operators of affected aircraft must incorporate them into their maintenance programs within 30 to 72 months, depending on the model of aircraft. After the limit is in the maintenance program, operators cannot fly the aircraft beyond that point unless the FAA approves an extension of the limit.

All of the limits of validity (LOV) are incorporated in the FAA Final Ruling on WDF. Of course these limits are capable of being extended but only under extreme scrutiny by the FAA.

EASA Regulations for Aging Aircraft

Currently there are still no regulations that the author was able to find in regards to EASA regulations for aging aircraft. There is a working document that currently available online mentioned in the references at the bottom of this blog that discusses aircraft aging and future regulatory requirements. Many of the recommendations gathered in the EASA document are due to the FAA assisting in creating this program. It does appear that there are plans on publishing a final document in second quarter of 2015.

References
Babbitt, J. R. (2010, November 15). Aging Airplane Program: Widespread Fatigue Damage; Final Rule. Federal Register. D.C., Washington, United States of America: Department of Transportation.
Dorr, L., & Duquette, A. (2010, November 12). Press Release – FAA Adopts “Comprehensive Solution” to Widespread Fatigue on Aging Aircraft. Retrieved June 17, 2014, from Federal Aviation Administration Web site: http://www.faa.gov/news/press_releases/news_story.cfm?newsId=12137
European Aviation Safety Agency. (2013, April 23). Notice of Proposed Amendment 2013-07. European Aviation Safety Agency. Cologne, Germany: European Aviation Safety Agency.

Wednesday, June 11, 2014

Direction of this blog

Background and Reasoning for Study

Currently the author works for a section of the Boeing Company that leases used airplanes to airlines across the world. One of the major focuses that is coming down the pipeline from the FAA is aircraft aging and the effects that is has on the aircraft. Aircraft aging isn't just about the years that pass but has to do with the cyclic impact of using the aircraft on a day to day basis. Every time an aircraft takes and lands (known as a flight cycle) there is wear and tear performed on the aircraft. During the course of a flight cycle the fuselage of the airplane undergoes and expansion and a contraction which produces wear on the material. Continuous wear ends up producing damage and if not caught in time can produce catastrophic results.

Since the author works closely with aged aircraft the importance of understanding Aging Aircraft and how it effects the market is really important to her job. The FAA is starting to crack down and has created a questionare that is to be completed by commerically flown aircraft operating under the FAA. What the issue is now is how to extend those requirements past just the operators in the United States to those in other countries where these requirements may not be prevelant.

Why This Topic is Important

Every day the fleet gets older and people continue to board the airplanes. Humans have trust that no matter the age of the aircraft that it will depart their current airport and land at their destination without fail. This has to be accomplished by correctly maintaining the aircraft. One major question is just how old the fleet is out there. Well the average fleet is about 14 years old according to a study conducted in 2010 by The Airline Monitor. That's based on the major carriers in the United States alone. A well maintained aircraft could easily last longer in the fleet before finally being decommissioned. Other websites suggest that the retirement age on most fleet aircraft are about 25 years old as of 2013.

Why are these airplanes being retired so early? Is it because of the actual age of the aircraft and the fact that they are no longer safe to fly on? No. It's because the aviation community is constantly trying to find more fuel efficient aircraft in order to increase their profit margins. When it does come to an aged fleet there are various other reasons why it might be decommissioned such as:

  1. cost of the maintenance being performed
  2. aircraft operating economics
  3. airframe versatility
  4. flexibility
Now add the requirement that the FAA wants operators to complete a survey after the aircraft reaches a certain amount of flight cycles and there is one less desirable reason to keep these assets in their fleet.

So why is this topic really important to everyone? Even though the average age of aircraft being retired is going down this is not sustainable. Eventually as the market for purchasing new aircraft declines the age of the aircraft is going to continue to increase. Aircraft operators are working with engineers to limit the reasons why the aircraft may be retired. Such as issues being engineered out reducing the number of maintenance visits that have to occur or extending the time between maintenance visits. Even with all this happening the aircraft is still being aged by various other factors that can not be ignored.

Definitions, Goals and Objectives

Definitions of all defined terms (terms that are capitalized) will be added to along the course of this blog under the blog labeled "Defined Terms". All terms will be in alphabetical order to ease in location of the term. If a defined term is not the definition that the author is using but a general definition (such as The Boeing Company) proper APA citation will be available below the term to link where the definition was taken from.

Goals and Objectives:

  • To give a general definition of what aircraft aging is so that even those without aviation experience can understand
  • Provide examples of different ways that aircraft are aged
  • Provide examples of different ways to reduce aircraft aging effects
  • Explain how the FAA is starting to "crack down" on aircraft aging

Note: Additional goals and objectives may be added at a later date as more research is performed. There may also be posts to this blog that do not pertain to the goals and objectives but provide useful information to the public about Aircraft Aging in general.

References

Compart, A. (2013, February 11). 2013 Could Be Telling For Aircraft Retirement Trend. Retrieved June 11, 2014, from Aviation Week Web site: http://aviationweek.com/awin/2013-could-be-telling-aircraft-retirement-trend

Pawlowski, A. (2010, February 1). How old is the plane you're flying on? Retrieved June 11, 2014, from CNN: http://www.cnn.com/2010/TRAVEL/02/01/planes.age.dreamliner/

Tuesday, June 10, 2014

Understanding Basic Aircraft Aging

The AOPA provides an excellent short course on aircraft aging based on aircraft that a person may purchase for personal use. There are multiple videos to assist in understanding how aging occurs and that aging is not just caused by time passed.

According the AOPA aging comes from three main reasons:

  1. Flight Activities
  2. Maintenance Performed
  3. Damage History

That aren't the only reasons and any small thing can cause additional aging. Think how the aircraft is stored or animals that get into the aircraft and build nests. All of these can affect the age of an aircraft.

This class is great for pilots that have a Certification because at the end of the course there is a test that will create a certificate. Sadly the author of this blog is not pilot certified and could not get her certificate despite properly completing the course. She would still recommend going through this course for basic knowledge (even if you aren't pilot certified). Even with all the interactions the author was able to complete the course in about 2 hours with an average reading speed.

AOPA. (n.d.). Aging Aircraft. Retrieved June 10, 2014, from AOPA Aging Aircraft Certificate Course: http://flash.aopa.org/asf/agingaircraft/swf/flash.cfm?keycode=FX07CRS&offercode=FX07CRS

Acronyms Used

This blog may use terms that are not well known to people outside the aviation community. When an acronym is used in any of the blogs the correct extended name will be placed here. Should the same acronym be used more than once both will appear and a reference as to what blog it came from will also be available.
AOPA: Aircraft Owners and Pilots Association
EASA: European Aviation Safety Agency
FAA: Federal Aviation Administration
LOV: Limit of Validity
WFD: Widespread Fatigue Damage