I had some good news this week.
During initial captaincy training and occasionally during periodic checks and recurrency training in the Twin Otter, we shut down an engine in flight and go through the process of an airstart. I’ve done it many times over the years and most recently during Volkher’s and Greg’s recurrency training that I’ve mentioned in recent weekly letters.
Following Greg’s training the engine we shut down showed some signs of deterioration on the daily engine trend monitoring we do. Exactly why was the major question that we were all asking. I could think of nothing that had been done that was different from any other occasion. The engine had to be removed, split and its hot section, where the fuel is burned to produce the power, sent off to the overhaul shop. At one stage we thought it might be necessary to replace all 58 turbine blades, at about $2,000 US dollars each. Ouch.
It was with great relief that we learnt this week that while there had been some rub on the blades, they weren’t seriously damaged, and that the problem has been seen by the overhaul shop resulting from other airstarts. The blade rub was the result of differential cooling after the engine was shut down. If we’d waited a couple of minutes longer before restarting, the problem would never have occurred.
With the Otters being phased out it is unlikely that anybody else will need to do a practice airstart, but in the meantime I am very, very relieved that nothing wrong was done, the risk of a recurrence is easily prevented, and that I am not responsible for over $100,000 of engine damage!
This week was entirely an office week. I’ve caught up on quite a few tasks, but never quite caught up completely. There were some other maintenance issues this week (not with the Otters) that unexpectedly took up quite a lot of time, and those are still ongoing. In contrast, I’ll be flying every day this coming week, Monday to Wednesday down in Goroka again.
Looking ahead to next year, I’ve entered for the Milton Keynes Half-Marathon again. I hope that it won’t be as hot as last year, but I also hope that it won’t be pouring with rain and blowing a gale. I’m not sure which would be worse.
Unfortunately, by May I will probably have lost most of the benefit of altitude training: 18.89 km this morning, my longest for a long while. The time of 2 hours 13 minutes is not brilliant, but the 536 metre altitude gain (and back down again), that’s 1,759’, provides some excuse. On the flat I think there’d be a reasonable chance of breaking the 2 hour barrier on a half-marathon, which is my goal for next May.
After mostly cloudy skies for the last couple of weeks, with some very difficult weather for some of our pilots to work, yesterday and today have been gloriously sunny.
Running (interspersed with walking spells) up Rondon Ridge this morning gave stunning views of the Hagen Range and Mount Giluwe (over 14,000’ high), with golden morning sunshine making the mountains glow.
A new road is in the process of construction up on to the ridge, so rather than come down the way I went up, I explored new territory.
The views as I ran down continued to be stunning. For the first part of the descent the road was excellent, well graded and smooth with bridges over the streams. As I got closer to town, construction is still underway.
I had to slow down, find a way around muddy patches and also to cross some larger streams. I chickened out of walking across one substantial chasm on two fallen tree trunks, preferring to climb a bit higher and find a track that the bulldozers were using. Local people invited me to cross another, smaller stream along a thick bamboo. They would cross it without even slowing; I went down to the stream, jumped across and climbed up the other side. Fortunately, the dry couple of days had made the mud firm, but I wouldn’t want to follow that route after a lot of recent rain.
All along the route there were friendly greetings from the local people. In some places the people have seen me before, but down the new road I am quite likely the first white runner they’ll have seen. Good fun and great to be out on such a lovely morning.
Dave and Jane arrive next Sunday, which we’re very much looking forward to. After a few days in Hagen we’ll all be off to Telefomin for ten days. I’m not sure how much weekly news will be forthcoming during this time.
During initial captaincy training and occasionally during periodic checks and recurrency training in the Twin Otter, we shut down an engine in flight and go through the process of an airstart. I’ve done it many times over the years and most recently during Volkher’s and Greg’s recurrency training that I’ve mentioned in recent weekly letters.
Following Greg’s training the engine we shut down showed some signs of deterioration on the daily engine trend monitoring we do. Exactly why was the major question that we were all asking. I could think of nothing that had been done that was different from any other occasion. The engine had to be removed, split and its hot section, where the fuel is burned to produce the power, sent off to the overhaul shop. At one stage we thought it might be necessary to replace all 58 turbine blades, at about $2,000 US dollars each. Ouch.
It was with great relief that we learnt this week that while there had been some rub on the blades, they weren’t seriously damaged, and that the problem has been seen by the overhaul shop resulting from other airstarts. The blade rub was the result of differential cooling after the engine was shut down. If we’d waited a couple of minutes longer before restarting, the problem would never have occurred.
With the Otters being phased out it is unlikely that anybody else will need to do a practice airstart, but in the meantime I am very, very relieved that nothing wrong was done, the risk of a recurrence is easily prevented, and that I am not responsible for over $100,000 of engine damage!
*************
This week was entirely an office week. I’ve caught up on quite a few tasks, but never quite caught up completely. There were some other maintenance issues this week (not with the Otters) that unexpectedly took up quite a lot of time, and those are still ongoing. In contrast, I’ll be flying every day this coming week, Monday to Wednesday down in Goroka again.
*************
Looking ahead to next year, I’ve entered for the Milton Keynes Half-Marathon again. I hope that it won’t be as hot as last year, but I also hope that it won’t be pouring with rain and blowing a gale. I’m not sure which would be worse.
Unfortunately, by May I will probably have lost most of the benefit of altitude training: 18.89 km this morning, my longest for a long while. The time of 2 hours 13 minutes is not brilliant, but the 536 metre altitude gain (and back down again), that’s 1,759’, provides some excuse. On the flat I think there’d be a reasonable chance of breaking the 2 hour barrier on a half-marathon, which is my goal for next May.
After mostly cloudy skies for the last couple of weeks, with some very difficult weather for some of our pilots to work, yesterday and today have been gloriously sunny.
Running (interspersed with walking spells) up Rondon Ridge this morning gave stunning views of the Hagen Range and Mount Giluwe (over 14,000’ high), with golden morning sunshine making the mountains glow.
A new road is in the process of construction up on to the ridge, so rather than come down the way I went up, I explored new territory.
The views as I ran down continued to be stunning. For the first part of the descent the road was excellent, well graded and smooth with bridges over the streams. As I got closer to town, construction is still underway.
I had to slow down, find a way around muddy patches and also to cross some larger streams. I chickened out of walking across one substantial chasm on two fallen tree trunks, preferring to climb a bit higher and find a track that the bulldozers were using. Local people invited me to cross another, smaller stream along a thick bamboo. They would cross it without even slowing; I went down to the stream, jumped across and climbed up the other side. Fortunately, the dry couple of days had made the mud firm, but I wouldn’t want to follow that route after a lot of recent rain.
All along the route there were friendly greetings from the local people. In some places the people have seen me before, but down the new road I am quite likely the first white runner they’ll have seen. Good fun and great to be out on such a lovely morning.
*************
Dave and Jane arrive next Sunday, which we’re very much looking forward to. After a few days in Hagen we’ll all be off to Telefomin for ten days. I’m not sure how much weekly news will be forthcoming during this time.