First nav!
Sunday, September 16th, 2007Time flown today: 1h 15m
Total time so far: 26h 45m
For the first time, I was flying first thing in the morning, since the late evening slots are no longer possible. It started with a lengthy brief on the principles of navigation, and the plan for the day. All fairly straightforward, though:
- Depart runway 19, follow the railway to Charlbury, then route Charlbury-Evesham-Banbury-Kidlington, for an overhead join to land.
- Circle the waypoints on the map, and draw the connecting lines.
- Note the minimum safe altitudes - more than 1300ft above the highest point within 5nm of the track, or above 500ft (i.e. 1800ft) if nothing is marked.
- Get the met, and do the plog calculations to obtain magnetic headings and leg durations.
- Mark half-way points for each leg on the map. These are good for ETA progress checks, and FREDA cruise checks.
So we went to the aircraft, did the usual start checks, and prepared to set off. Ground, Tower and Approach were all active on different frequencies at this time of day, so the taxi call was to Oxford Ground. At the runway holding point, we made the simple call to ground:
“Golf Bravo Tango Golf Oscar, over to Tower”.
One significant flaw in my radio calls thoughout the flight, is that I used the abbreviated callsign in responses before ATC did, because I wasn’t properly listening for it. I need to make a point of listening carefully and getting this right. Anyway, I changed to Tower, and announced:
“Oxford Tower, Golf Bravo Tango Golf Oscar, ready for departure”.
I also requested a right turn, and when Tower queried this shortly after takeoff I think I mis-understood something and repeated that we’d requested a right turn. The instructor intervened, but I still don’t understand exactly what happened. Anyway, shortly before reaching the railway south of the airport, we turned westwards to follow it. The instructor said that it’s important to stay north, to avoid entering Brize Zone. At that point (about three miles west of the 01/19 centreline), the railway is actually a good distance north of Brize Zone (the edge of which is about a mile north of Eynsham parallel with the A40), but I wasn’t going to argue. We followed the railway north, past Woodstock, Long Hanborough, Stonesfield, and soon enough Charlbury appeared ahead. Meanwhile, time to change to Oxford Approach:
“Golf Golf Oscar, to Approach.”
(Tower acknowledges)
“Oxford Approach, Golf Bravo Tango Golf Oscar is airborne to the west, request Flight Information Service.”
(Approach acknowledges)
“Flight Information Service, Golf Bravo Tango Golf Oscar.”
I think I probably erroneously used the abbreviated callsign in response, when Approach used the full one. I need to stop doing that.
So with overhead Charlbury, I noted the actual time of arrival (ATA) of 45 past the hour, planned the ETA for the next waypoint of Evesham (58 past the hour), did a FREDA check, and the instructor took control to let me get used to this mapreading and visual navigation business. I suppose it helps that I know the area pretty well, both from the ground and from road maps, and that the conditions were perfect. But even so, it was all pretty easy, fixing our position from the combinations of villages, roads, railways, high ground (which is distinctive and useful in the Cotswolds), and disused airfields. The leg half-way point of Moreton-in-Marsh appeared on the nose exactly as expected, and as we approached the instructor declared that it was all too easy for me, and gave me control. Did the FREDA checks as we passed just south of Moreton, and settled down to resume the pattern of reading the ground and the map. I noted that the instructor was fiddling with the VOR: he’d set it to 116.4 for Daventry, and found that we were roughly on the 240 From radial as we passed Moreton. I’d been unconsciously applying a little back-pressure on the yoke though, and we’d climbed 100ft above our desired altitude: it took me nearly until the Cotswold escarpment to sort that out, because I didn’t correct it positively enough. But apart from that, everything went completely to plan, Evesham appearing on the nose exactly as predicted, bang-on ETA. The instructor made a fair effort to distract me, but checking heading and altitude every ten seconds or so is an easy habit to get into regardless of what other conversation or navigation I was engaged in.
At Evesham, time to follow the waymark routine - turn, time, talk and task:
Turn: the course change was about 150 degrees, so a teardrop turn in the opposite direction was executed to bring us onto the new heading over the centre of the town. This gave a good opportunity to thoroughly eyeball the town, and get numerous positive confirmations of its identity: the distinctive bend of the river in the town centre, the railway heading out to the north-west, the dual-carriageway out to the north, and Bredon Hill about four miles to the south-west.
Time: as we emerged onto the heading for Banbury, 23 miles distant, at exactly the hour, I noted the ETA as 14 minutes past.
Talk: not really necessary to talk to anyone this time.
Task: a FREDA check, then back to maintaining the course.
Navigation towards Banbury continued. It was thoroughly pleasant, not only looking at the pretty view but actively studying the ground features to establish and confirm where we were. The instructor plotted that Banbury lay on the 235 radial from the Daventry VOR, so he set up the VOR to indicate when we reached the end of this leg. I’d failed to notice that our course clipped the edge of a gliding site, though: for some reason, the blue G in a thin circle evaded my brain as I stared at the course on the map. The instructor suggested that we should detour to the south of a village just south of the gliding site, to make sure we avoided it. After we passed the leg half-way point of Shipston-on-Stour, I began scanning the horizon ahead for the site: but it came up much quicker than I expected, and I failed to see it. I should have realised that being only about five miles beyond Shipston, we’d reach it in less than three minutes. Anyway, by the time the instructor finally pointed my eyes in the right direction, we were about to infringe it and we had to take quick action to keep clear. On clearing it, we were visual with Banbury from our slightly diverted position, so I flew directly there, the VOR needle nudging towards the centre as we approached the town.
Time for the last leg! Set a course southwards from the middle of Banbury, and continued the navigation. We saw some glints in the haze, possibly at a similar level - fearing conflicting traffic, we turned the landing light on and kept a keen lookout, but nothing else materialised. It may have been circuit traffic over the airfield, or possibly even in Brize Zone. Anyway, we had the DME tuned to Oxford, and at 5 miles, with the airfield just visible, we made a call to Oxford Approach, addressing them as if it was a first call since we hadn’t spoken to them for over half an hour:
“Oxford Approach, Golf Bravo Tango Golf Oscar, airfield in sight, request standard overhead join.”
The overhead join was approved, and we were instructed to report overhead. I can’t recall exactly how and when we changed to Oxford Tower, but soon enough we found ourselves approaching the airfield, so I descended to 2300ft for the overhead join. We’d been hearing a slightly-confused microlight heading towards the airfield, requesting a transit through the overhead at 2400ft, and ATC were a bit concerned that we’d conflict with them. Our entry to the overhead join was a bit delayed, because I set off around the wrong way around the airfield and had to do a 180 to get to the right point to start the join. But never mind. I got into the correct position, answered ATC’s rather anxious enquiries about our position and height with respect to the approaching microlight, and quickly started descending round the dead side. The overhead join was pretty good, although once downwind things were a little ropey: altitude control slightly wayward and the turn to base a bit uncoordinated, but I held it together well to make a great approach and landing, with a length hold-off and gentle touch-down. 8/10.
I should check what the points are for changes of radio service, and what the calls are. I should also check my route more carefully for things like gliding sites that might get in the way!