First of all, lets look at a real MEL just to get some feeling for it, see one of my earlier posts in a different thread:
http://www.team-bhp.com/forum/commer...ml#post3296607 Quote:
Originally Posted by phamilyman F
OK, this is basically the POV shared by a person who was earlier in the industry and in the know on this statistic - his logic is that while MEL flights are technically allowed, the question is whether certain carriers had more % MEL flights than others or not. That is where I believe Indian (or rather all!) carriers should publish this information.
While it is safe to be on a MEL flight, that statistic should be as low as possible. As with any metric - if you track it, you improve it.
- I would like to know which carrier invests more proactively in maintenance, and possibly least % flights on MEL would be a relevant objective parameter to measure that |
As you say, as long as a carrier adheres to whatever the MEL stipulates the respective flight is considered safe. I don’t see any value in reporting the % flights on MEL as you put it. More relevant, how often do aircraft operating with a MEL item get themselves into the incident/accident statistics? In all honesty I don’t know. I can say that it is pretty rare to see it mentioned in incident/accident reports.
So I did a small experiment using the data available to the public on The Aviation Harald. I did a search for MEL:
http://avherald.com/h?search_term=me...x=0&search.y=0
As you can see a couple of dozen flights come up. When you actually read these reports you will notice that in only a few you will actually come across an incident/accident where the MEL item played some sort of role in the respective incident/accident.
There are thousands and thousand of reports available on The Aviation Herald. So whereas I’m sure there are some incidents/accidents I don’t think it is an safety issues. More importantly, the once I did find where all due to the crew and or various maintenance/planning departments giving an incorrect interpretation to the MEL. Had they used it correctly, nothing would have happened.
So tracking and reporting % MEL is unlikely to improve safety statistics I would think, but anybody who believes they have better data in proving that differently please do.
Quote:
Originally Posted by phamilyman Of course, more crashes happen due to pilot error than maintenance - but the former is a random uncontrollable variable. I'd like to put my life where the latter is most proactive. Wouldn't you? |
I don’t agree pilot error is uncontrollable. In fact it is very controllable in the sense it comes down to things like appropriate pilot training, attitude to safety, the overall safety regime of the respective carrier etc. See my earlier comments about the FAA wings program which resulted in a dramatic decrease in fatal accidents in the General Aviation community in the USA. There are other examples as well, where pilot training has sharply reduced incidents and accidents.
Quote:
Originally Posted by phamilyman EDIT: I see where RVD reacted - all I'm saying is, in my experience, I have heard a lot of praise for the widebody maintenance teams of AI (international) prior to the merger. That used to be the high watermark in that era. All Im praising about indigo now is that their policy to retire planes early, simply reduces maintenance as a likely factor for any crash by a great margin. Not saying their engg teams are better than AI.
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Again, you make statements, but are they backed up by facts? Is the age of a plane a factor?? Well, again, I am not an expert, but there are a few papers produced on the topic.
Have a look:
http://www.awg.aero/assets/docs/analysisofimpact.pdf
The general conclusion:
Quote:
The analysis indicates that there is no correlation between the fatal accident rates and aircraft age up to 27 years of age. Above this age there was a slight increase in the fatal accident rate but the accident rate data is not statistically significant due to the limited number of operational years for these older aircraft cohorts. When all accidents are considered there is no correlation between accident rates and age up till 18 years and a weak trend of increased accident rate with age is observed for aircraft older than 20 years. This increase in the worldwide accident rate is driven mainly by Africa which exhibits a statistically significant increase in accident rate for aircraft older than 20 years. Other regions such as North America and Europe do not exhibit any correlation of accident rate with aircraft age. An analysis of the accidents in which the aircraft were older than 20 years of age indicates that that the observed increase in accident rate in Africa is not due to aging aircraft factors but due to other risk factors.
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And maybe the most relevant one:
Quote:
The analysis does not support age-based import restrictions as an effective measure to increase aviation safety, providing Design Approval Holders and Type Certification Authorities support National Aviation Authorities in managing older fleets under their responsibility.
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Safety in general, but certainly in aviation starts (and ends) with the right attitude. So if you want to think about aviation in the Indian context I personally think you need to start with Indian attitude to safety in general and how would that translate to an aviation environment. How come DGCA managed to get India bumped down the IASA rating system to sub Sahara standards?
A few examples.The negative effects of hierarchy played an important role in the worst aviation disaster to date; two Jumbo jets collided on the runway at Tenerife. That was nearly 40 years ago. Even today we still see hierarchy playing a role in a aviation accidents, notably in carriers coming from middle and far east.
Hierarchy plays a big role in Indian society. Well, at least that is my impression having lived and worked in India for four years. The pathetic response of the cabin crew on this Jet Airways has been mentioned repeatedly. I mentioned it too. I find, by and large, the way they behave themselves under normal circumstances appalling. They are meek and rarely speak up or act as they should. Few Jet Airways flight attendants would look me squarely in the eye.
That is, I think, a cultural/hierarchical issue. So how do we address that?
Coming back to the MEL. Obviously, strict adherence to MEL rules and regulations is of paramount importance. Think through how culture and hierarchy can play a role. (E.g. if the captain signs off, would the first officer or a flight planner still challenge that decision?)
Some years ago, I helped organise a workshop for 747 flight SIM enthousiast and we had a couple of KLM technician and pilots involved as well. One of the pilots talked us through what he called “beyond” the checklist attitude.
As an example he used the hydraulic pump 4 out scenario. A MEL item on the 747-400. There are various procedures and restrictions to follow. Paperwork gets filled out, read and signed off. It’s taken into consideration by flight dispatch for the flight planning etc. What is interesting though is how the flight crew worked it into their flight briefing. Obviously they went through the standards bits. But then they could spend as much as 10-15 minutes discussing and brainstorming around what-if scenario’s. No check list, just a free and open discussion to think through different scenario’s and different options over and beyond the normal one.
It was very interesting, because if you adhere to the MEL you are ‘legally’ safe, but as I have pointed out in various other threads, being within legal boundaries is just a minimum. Doing more is not legally required, but is down to the attitude of the respective carrier and individual pilots.
Jeroen