Edition 133
 

This forum was started in October 2003 and is distributed weekly to approximately 10 000 email recipients across the globe. Its purpose is to allow the exchange of ideas, tips, and advice for the purpose of aviation safety. Back issues have kindly been made available at http://efc.org.au/_sgt/m3_1.htm . Contributions are encouraged, and welcome.

 

Hi Gary,

Your series of comments on John Denver is of particular interest to me as I was introduced to flying by a friend with a Long EZ. He once told me of an incident he had with the fuel valve (that was between his legs) where the valve had jammed at an inopportune moment and there was nothing he could do to free it.  Having landed safely with very little fuel remaining in the active tank he found that he needed a spanner to get the valve to move.  This particular valve is commonly used in homebuilt aircraft and when I received one as part of a RV6 kit, I examined it to determine why it might be susceptible to a jam.  It has a brass body with a tapered brass core that apparently relies on lubrication to stop the two faces from binding.  There is a possibility that over time the lubrication might be removed by the fuel.  I modified my valve with a washer to prevent the taper from bottoming out and never had this problem.  I recently changed the valve for one of better quality as I have never been able to get this out of my mind and often wondered about the John Denver accident.  If he had to release his seat belt to battle with a valve behind him then the situation after possibly bumping the control column forward would have been dire.

Regards, Noel Drew, Durban, South Africa

Gary,
Googled the B-17 story. Many accounts of it. I've heard other stories of compassion as well, including a luftwaffe seaplane rescuing allies and given safe passage to repatriate them to allied medical treatment. Each time I read a story like this, it makes me wonder (again), why we fight each other in the first place?
Lou Siegal, USA 

When Things Go Quiet! by Gary Wiblin

 

I recently received a call from a reader that said he was learning to fly, but had a recurring problem. He said that each time he took to the air, he became unreasonably afraid that the engine was going to quit. He said that it wasn’t just a nagging worry but rather that he remained tense and nervous throughout each entire flight constantly fretting that the engine would quit at any given time and that he would then be doomed. After chatting for a while it certainly seemed as if he was genuinely concerned that he would indeed be in mortal danger if he were ever greeted by a whole lot of silence from up front. I advised him to get his instructor to skip some lessons and move on to the simulated forced landing part of the training course so that he could see that, should the engine fail, there was indeed a whole lot that he could do about it. This would then hopefully allay any future fears.

Engine failure in any aircraft is extremely rare but it does happen. In my 9000+ hours I have experienced three engine failures so it does indeed sometimes happen. It is for this reason that there are procedures in place and it is vitally important for any and all pilots to practise regularly. In the airlines, pilots are regularly drilled in simulators on engine failure and recovery techniques and PPL’s too have to renew their licenses every two years by demonstrating their expertise should an engine fail. Doing a practise forced landing only once every two years though is by far not enough. You would do well to round up an experienced instructor at least every six months and simulate engine failure under various different circumstances.

Engines can fail for a variety of reasons. In one of my three experiences I was working flat out at a flying school. We were extremely busy each day and it got to the stage where one flight just melded in with the next. On one such day I went on a training flight with a student in an aircraft that had a broken starter motor. I hand swung the engine to life and off we went. The flight was to practise simulated forced landings and once in the general flying area at altitude, I shut down the engine to initially show the student that the aircraft glides just as it should with the propeller standing still. I then flicked the starter to demonstrate the air start only to have the realisation dawn on me that this was the trainer with no starter motor! Darn! That’ll teach me to leave my brain on autopilot! Anyway, I then merely continued with the demonstration of the forced landing with the only difference being that this was now for real, rather than a simulation. We both learned a lesson that day.

On the other occasion I was flying a Baron at altitude when one of the pistons on the right-hand motor began disintegrating. I had to shut down the engine and return to base on one engine but there was no panic involved, merely the following of procedure. I appreciated having a “spare” engine that day. On the third occasion I also had to shut down a misbehaving engine in a twin but there were no dramatics and the flight ended peacefully.

An engine failure in any aircraft is never meant to be fun, especially if it is in a single, but there should also not be any reason for panic. In the early days, before carburetors were added to engines, the only way pilots could control the power output of the engine was to either have it switched on, or off! In other words, for the descent, the engine was merely switched off and then “blipped” every now and then to keep the propeller windmilling so that they had power if they needed it. Once they were committed to a landing the engine was left switched off altogether. Gliders too do a forced landing every time they fly and you don’t hear them grumbling! Large airliners too often reduce power to idle and glide from altitude all the way to final approach. They are really just big gliders with forward thrusters.

Remember that if an engine fails in a single engined aircraft, you need merely glide the aircraft to a reasonably flat piece of open ground and land it, fully stalled, into wind. You will then touch down at the lowest possible ground speed and you need merely prevent the aircraft cabin from striking anything solid and you will walk away from it. Easy huh? Get yourself an instructor and go and practise them forced landings. You owe it to yourself not to be too surprised when the cabin goes quiet.


Spotlight On

Name? Steve Odendaal        

Age? 54

Personal qualifications? Matric

Flying qualifications? CPL, Gr.II 5,500 hrs

Do you own an aircraft? If not, what do you fly? Harvard, Dakota, Bosbok, Kudu, Albatross

What is your day job? Civil Aviation Head of Operations NTCA

Why did you choose flying as a career/sport? Same old same old � always wanted to fly

What irks you about aviation? Not following SOP’s and procedures

Can anybody learn to fly? NO

Describe your most memorable flight? 300hr, full IFR, vertigo for 30 minutes

Your closest call/most anxious moment? Student landing short, a/c written off

Your most admired aviation personality? Sailor Malan

What is your ultimate goal in aviation? Raise flight training standard

What aircraft would you still love to fly? L39

What direction do you think aviation will take in the future? More simulation

What is the most important single item of advice/suggestion that you would wish to pass on to your fellow aviators? Fly high and become an old pilot

Do you read Aviation & Safety Magazine? Yes