Someone Has to Read Them

The flight that was cancelled in the previous blog entry is back on again, but there's a new weather puzzle to solve. The scud is still present in the low terrain, but this time the air is stable, only trace icing expected. The clouds only go up to ten thousand, so I can climb through them and fly on top with no fancy routing. We'll cancel IFR and alerting after we get into uncontrolled airspace further north, so we can descend out of radio contact and look at the things that it's our job to look at, without people getting all antsy about us showing up to do an approach at our destination.

This time we do depart, and the flight goes as planned. The wings and windshield stay clean as we climb through the slowly brightening grey. I switch to sunglasses as we break through the top into the sunshine. I'm going northwest, and the sun has risen behind me, projecting a round rainbow on the clouds below me, visible through the propeller. It's called a glory or the glory of the pilot because you have to be between the sun and the clouds to see it. The colours repeat through the ring, faintly right into the centre and fading away to the outside. It's a light refraction effect, obviously, but according to the Wikipedia article it isn't certain how they are formed.

As we continue north, dark shadowy holes appear in the solid deck of clouds below, and then they widen to become green and grey and sparkling as the clouds scatter out and we can see the rocks and lakes and trees that define most of Canadian geography. the lakes are not yet frozen and some of the deciduous trees still have their coloured leaves. The clouds thin to occasional wisps and I cancel IFR to fly without having to follow a clearance or stay so far above terrain. Once we finish our work we turn again toward our destination. I'm listening to the Centre frequency as well as the air-to-air en route frequency of 126.7. I can't communicate with Centre, but I can hear other aircraft talking to them and pick up some information that way. A Dash-8 announces that they are in the missed approach from what we'll have to call Elk Creek. The fact that Elk Creek is below minima is a bad sign for the weather at my destination, because the two airports are relatively close, but then the Dash-8 pilot reads back a clearance to my destination. That's a good sign that overrides the bad one. He wouldn't miss and then go somewhere dubious. Sure enough I soon hear the Dash-8 pilot say he's planning the contact approach, which means he has the terrain in sight and is confident he'll remain visual all the way to the runway. He asks to fly direct a fix I'll call WIBEL and then I start to be able to hear the controller, who can't find WIBEL, even after the pilot spells it. The pilot tells him which approach it's on, and that it's the fix before AXFUG. (I wonder who makes these things up. It's kind of fun.) The controller says that the fix before AXFUG is WAGPO. I know what the problem is, but I can't interrupt their conversation. The two of them discuss this for a while, get the pilot an appropriate clearance, and then the controller has a number of calls to catch up on. When he's done I check in and add, "There's a NOTAM out today on the WIBEL/WAGPO situation." I knew I was planning in here VFR, but my eye ran over a NOTAM mentioning a waypoint substitution, and them repeating the waypoint name has triggered my recall.

The controller says, "Thanks, Aviatrix," using my real name over the frequency. He finds the NOTAM and reads it out. WAGPO has been temporarily replaced by WIBEL. It's curious that the airliner had a database that showed the new temporary waypoint while the controller didn't. I would have expected it to be the other way around, or to have them both be operating with post-its on their screens.

Future So Bright

It's a rainy, miserable fall day with the freezing level a little lower than the minimum en route IFR altitude. I study the GFA showing the cloud levels and types in the area I'll be flying through, and decide that yes, we can do the flight in this airplane. I can climb above the level of the cloud that will carry the most dangerous ice before I reach the area that has those clouds, and destination is clear, giving a safe descent. I file a flight plan beginning with a waypoint that we always file out of this airport, because it's the end of the published departure procedure, but as we're going the other way, I don't expect to actually go there. We'll be in radar contact with ATC as soon as we're off the ground and they will vector us on course.

Except they're busy. I end up flying all the way to the waypoint, and then a little bit past on vectors, and then more vectors. Vectors to the right towards the way I want to go, and then, possibly because I wasn't climbing fast enough for the controller's liking, vectors back to the left. "Vectors" just means the controller assigns me a heading to fly. Altitude is being meted out to me in thousand foot increments, from the departure plate up to the MEA, but still not my filed altitude. We're intermittently in rain, cloud, raining cloud and between clouds. "Raining cloud" isn't a thing that I've ever heard anyone say before, but it's sort of a thing. Sometimes when you're in cloud it's quite light, but you just can't see anything around you. That would be near the top of a cloud with sunlight above. Sometimes it's dark and cold. It's usually very moist, with water running up the windshield, but sometimes it's dark, with obscured vision and pelting rain. I guess on those times I'm inside a cloud underneath another cloud that is raining. It's kind of hard to see, as I'm in a cloud.

I say to my co-worker, "you bring your sunglasses?" He hasn't. "Just wait and see," I tell him. "This is one of the most fun parts of being a pilot."

We're level now, with the outside air temperature flickering between plus and minus zero (it rounds to the nearest degree on the instrument, but must have finer gradations internally). Into another cloud. This one is bumpy, a bad sign, and it's a raining cloud, but water doesn't stream up the windshield. It freezes onto it. All this vectoring around and delayed climb has got me into the area I want to avoid. I can see the water running back on the wings and freezing in little horizontal dribbles, exactly like the icing on the edge of a cake. (I think Americans call that frosting). There's a strip of rime building forward, too. This is not acceptable. Thanks to terrific weather forecasting technology I know exactly where the tops of these clouds are. I tell the controller we are picking up ice and ask for a climb to that level, the level I had wanted to fly in the first place. We get it, breaking through the tops of the clouds, a perspective that changes them instantly from dark monsters that obscure my vision and threaten to burden my airplane enough to tear it from the sky, to a brilliant white reflector for the sun. There's nothing but blue sky overhead, and I quickly put on my sunglasses. The temperature here is below freezing, but the air is dry so the ice sublimates, passes from solid to vapour, leaving me again with a clean airplane after a few minutes.

Approaching destination, ATC advises me that there is opposite direction traffic that could be a conflict, do I want to start down now early, or arrive high? I ask for the early descent and we slip through a few wispy clouds before coming out at our destination, under clear skies. At the end of the day I update the flight time in company records and advise company that there are less than fifty hours left on the right hand vacuum pump. Vacuum pumps have to be replaced every thousand hours. I have often seen them fail early. The possibility of failure is why there are two of them, and I'm pleased that the two on this airplane are out of phase; the left one has only five hundred hours on it.