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Lucky Downwind Landing

Reading a recent article about premature termination of an aero-tow reminded me of a downwind landing I performed more than 15 years ago at Lachen-Speyerdorf, Germany. That day we had very strong SW winds that created a local wave. We departed in a ASK-21 on aero tow on runway 30 to release in the rotor. There were plenty of clouds from a cold front that had just passed and the grass runway was still soaking wet from the last showers. The wave window had nicely formed with a 5 mile wide window of blue sky in the lee of the mountains. On tow we climbed out slowly against the strong headwind in very turbulent cold air. The light was bright and the contrast from the cloud shadow just to the side of us made for a spectacular view. Andreas and I were flying together in the club’s ASK-21, trying to reach the rotor and then climbing into the wave. We released 5 miles away from our take-off destination at 2500ft AGL. The vario was dancing violently but we soon managed to circle in strong turbulent lift of 5 kts (2.5m/s). This produced a big smile on our faces, and we were already thinking about the best strategy how to jump into the wave from here. We didn’t even finish our thought before our 5kts lift turned into 8kts sink. I tried to stay calm and search for the lost rotor upwind. Accelerating the glider in sink is a daunting task. The needle of the altimeter moves at the same speed as the airspeed indicator increases. We were falling out of the sky. After one or two search S into the wind it was clear that we had lost the rotor and probably our chance to fly in wave for the day. We switched gear into “getting home” mode and pointed the nose towards the airport. With 45kts tailwind I wasn’t too concerned to reach the airfield. The terrain right below us was unladable with vineyards, but farmers fields would start half way home. The trouble was there was water everywhere. The sink was brutal. We were beaten down from the lee with 10 kts sink. The ASK-21 isn’t a particularly fast glider either. With a strong tailwind we weren’t supposed to fly super fast either. But the strong sink dictated fairly high speeds anyway. So we pressed on. Andreas was very quiet in the back. I told him that we could turn into the wind any time now and land on any of the wet fields below us, if the sink continued. I called on the radio for a straight in on runway 12 – well aware of the 25 kts tailwind on the ground. Our runway is 1000m long and I figured that would be enough if I touched down early enough. Going all the way for a pattern to 30 wasn’t an option any more. I kept my field landing option until the last mile and then committed to a straight in for 12. How fast are you supposed to fly your approach in this turbulent air? I opted for 130km/h because of the tree we had to overfly with the wind from behind. We made the tree, full flaps, made the runway and flew, flew, coasted coasted, floated, floated and floated, eating away runway at an alarming speed. We finally touched down shortly after the half mark of the runway, where I used full brakes. That’s when I learned about my biggest oversight. The runway was wet and friction for braking power from the main wheel wasn’t available. We skidded down the runway with 80km/h, 300m to go. Shortly after I lost all roll control from the ailerons because of the tail wind. The right wing dropped at around 40km/h ground speed and we were still skidding despite pumping the brake. Thanks to the wet ground the glider never ground looped and we luckily overran the end of the runway by a mere 50m. There weren’t any obstacles in the path. Then it was quiet. I was shaking. My heart was pumping. Our camarades came running towards us and a quick look at the glider confirmed that nothing had happened to the sailplane. I was very shaken and will never forget about the downwind landing wind speed limits and loss of traction on a wet grass runway.

Update on Blog Password protection

Earlier this year I promised to add password protection to the blog to share more personal opinions about contentious topics with friends, but not the world. After having checked into how dreamhost.com is providing the wordpress blog service, I’ve found out that I won’t be able to do this with the standard installation. Instead of going custom (and signing up for keeping the install up to date with security patches) I opt to not post these opinions here. Instead you’ll be able to read about my opinions on my www.austinity.com/opinion website location, that I’ll put in place soon. Then you’ll be able to read about my views on:

  • racism,
  • globalization,
  • patriotism,
  • quality of products,
  • brain research,
  • retirement,
  • privacy,
  • patents and
  • other things that are on my mind.

The drawback of course is, that it’s a one way street and you won’t be able to comment on my essays – a big disadvantage, as the comments are a big reward for the author. It also enables true discussion. But life is not perfect and for now I’ve decided that’s the way it’s going to be. See you at www.austinity.com/opinion.

Cockpit Complacency

Preliminary accident investigation results of the Boeing 737 crash of the Turkish Airlines that killed 9 were released yesterday. According to the report a failing radar altimeter caused the plane flying on autopilot and auto throttle to enter the landing sequence too early and to slow to stall speed in 600ft above the ground. When the pilots discovered the error it was too late to recover from the stall and the plane crashed a short distance before the runway. (Jet engines need a couple of seconds (an eternity when you need power) to spool up to power, very different from combustion engines).

What went wrong was that the pilots failed to properly monitor and second guess the full automatic system. The warning light for the failed radar altimeter was ignored and its implications for the approach not understood in time.

Automation is great, but if it makes the pilots complacent it’s dangerous. If automation works 99.9999% of the time, second guessing the computer becomes a boring task – you can get away with negligence many times. Had the pilot hand flown the approach in first place, this particular accident wouldn’t have happened, as he would have noticed the altitude error on time and would not have stalled the airplane while hand flying. Of course, statistically speaking, hand flying the approach is the less safe procedure compared to an auto approach.

So how could you prevent such an accident? First, crew coordination has failed. One of the pilots should have noticed the warning and disabled the auto approach. But beyond that there’s something lacking in the man/machine interface. The human mind needs to get challenged more often to stay engaged. So maybe a random simulated malfunction that requires pilot interaction with the system could cure the lack of attention that grows with time.

I don’t claim to have all the answers, but an accident like this is tragic and warrants thoughts on procedural change. The accident triggered Boeing to issue the following statement to the operators of the 6000 737 in the fleets: “…to carefully monitor primary flight instruments during critical phases of flight.” – Really?! Now that’s something new.

Fortunately I know the big airlines are paying people to do exactly that kind of accident analysis and implement the results in their daily procedures. One more reason to fly with a well reputed airline that trains their crews well and doesn’t cheap out on maintenance. Lufthansa , anyone?

Lost and Found

Today I found a cell phone in the street I was driving on. I stopped to rescue it from being run over (maybe I should place a sticker on my bumper: I break for cell-phones!). I figured that if the owner wouldn’t call me I could use it as a replacement for my old one – we live in a recession you know 😉
Sure enough the owner called 2 hours later. And WOW, was this cell phone voice transmission clear! I was impressed. After asking him a couple of questions about his phone to make sure he was the legit owner we set a time to meet to return the phone. Now I really want to change my old Razor phone for this Samsung phone – what a difference! Funny way to select a new phone, isn’t it?

Not Cool!

After three weeks of Wiener Schnitzel and Indian Food I had a strong craving for Sushi when I arrived back in the U.S.. So I went for lunch to a well known restaurant that serves Japanese and Chinese food on two different floors. We ordered the Lunch Sushi deluxe course in the Japanese restaurant. When looking over their menu I also felt a craving for Hot and Sour soup. Not quite sure which cuisine this soup is, I pragmatically asked our waitress if I could have Hot&Sour soup instead of their Miso soup. Big No-No mistake (Fettnaepfchen!). With ice cold face I was informed that Hot and Sour soup was Chinese cuisine. I thought so — hmmm. Udon soup will be just fine then. Ouch! Nevertheless, the Sushi was delicious!

From Germany to Austria for skiing

Last Saturday we got an early start to drive from Neustadt to Bad Hofgastein in Austria – about 650km (400 miles). We hit winter weather on the road and drove in snowing conditions all the way. There were stranded trucks, unable to climb the hills and cars – lots of cars – mostly from the Netherlands, which were headed in the same direction. Instead of the planned 7 hour drive, it took us 12 hours to arrive at our final destination. For that reason our stop in Salzburg was cut short to a coffee break with a short stroll into the old district with the cathedral.

The 12 hour drive in thick stop and go traffic with snow was even too much for my Autobahn taste …

Chennai

Today I woke up at 4am local (23:30) German time, 16:30 Texas time and couldn’t go back to sleep. The last couple of days, my jet lag was managable, but getting more than 6 hours of sleep in one shot is hard. Glad I had an entertaining book to read (“My life as a Quant” – Emanuel Denman). I also caught a slight cold which makes me a little weak.

The baby was sleeping so cutely on our bed and only woke up by 6:15a. Then he wanted to play immediately. His energy in the morning is very invigorating. With temperatures above 30C during the day, the apartment was  nice and warm in the morning. We stripped him off all of his clothes and diaper and let him play completely naked on the  warm marble floors. Very entertaining to watch. Eventually he had a big pee and was highly amused about sitting in it… the joy of a simple life.

Chennai – Security and traffic

Yesterday, we had lunch at the five star Sheraton restaurant. When we pulled up to the hotel we were greeted by a closed gate and two security officers. They demanded to search the trunk and used a mirror to inspect the bottom of the car before admitting us to the main entrance of the hotel. The driver got quite annoyed by this procedure, but I felt that the upped security measures were warranted after the Bombay bomb blasts on 26. Nov 2008. The hotel industry has responded to the threats with heightened security for their guests. Annoying but reassuring. Strange times.

On a different note: there are so many new cars populating the streets of India. So many Tatas, Marutis, Suzukis, Toyotas, Hyundais that haven’t been here in 2006. Apparently financing for the common man has picked up in the country. Along with it comes ever worse traffic jams. Lots of physical medians and flyovers where built since my last visit. Change is happening.

Americanized – away for too long

You know that you’ve been away from Germany for too long, when:

  1. you’re unable to identify your Golf Kombi rental car in the parking area (because they don’t sell this model in the US)
  2. you wonder why people are driving so slowly (140km/h) on the Autobahn (they used to drive faster when I still lived here)
  3. you wonder how people can live with such small fridges
  4. you are amazed by all the cute little trash cans people have (where the heck do you put all the packing material from your Amazon orders?)
  5. you wonder when the Weinbiet tower was cut in half (apparently it was only taller in my memories)
  6. when you find Germany’s busiest airport, small, cramped, inconvenient and “Stueckwerk”, lacking an overall broad vision (did you ever walk the new Terminal 1 parking garage walkway? Low ceilings, non heated, no buses, no conveyor belts and elevators that only go up or down – not both – a strange place indeed)

Looks like I’m a spoiled and confused American with a German passport by now.