Final checkout on WM
Thursday, April 23rd, 2009Time flown today: (tbd)
Total time flown: (tbd)
Following last week’s successful circuits session on runway 24 in very benign winds, the instructor in the group said he’d like me to get some practice on the 06 circuit, because the noise abatement demands are very specific, and also some crosswind practice. Well, fortunately, on the very next booking the winds favoured 06, and although there was perhaps less crosswind than I would have liked, it seemed to satisfy the instructor. So off we went.
First of all, an overhead join, which at Wycombe are rather unconventional. We departed north up the Bledlow ridge to the edge of the Chilterns, then turned left to fly south along the edge, past Chinnor, watching out closely for gliders soaring over the escarpment. We turned left along the M40 at the Stokenchurch mast, taking care to keep clear of the Lewknor parachuting site which was active, crossed over to the right-hand side of the motorway since we were following a line feature, and followed the motorway south-east at 2000ft QNH until it brought us into the vicinity of the circuit, with the airfield in sight. The trick is to look for the motorway bridge just north of the two villages of Lane End and Frieth, then fly straight ahead between the two villages at that point, diverging from the motorway and following the 06 noise abatement circuit pattern but at 1500 QFE, 500ft above the circuit height. On reaching the extended runway centreline, turn left onto it (the same track as final approach), and descend to be 1200ft QFE at the runway threshold. It’s important to stay no lower than 1500ft QFE until well onto the runway centreline (final approach track), to ensure separation from circuit traffic that may have wandered a little too high. Fly along the final approach track and runway, and half-way along the runway (need to look for other references around the airfield, because you can’t see the runway from directly above it at 1200ft!), turn 90 degrees left towards the downwind leg. This track avoids noise-sensitive villages, and descend to circuit height at 1000ft QFE to intercept downwind.
On the downwind leg, look for the water tower in the woods north-west of Lane End - that’s the cue to turn downwind, between Lane End and Frieth. with the wind blowing from the north, you have to get the flaps out and power back quickly: I’d normally go for 1400rpm from the start of base, but 1200rpm works better here if I’m to avoid being too high on final. I got this wrong the first few times, ending up high and having to lose height on final: the instructor introduced the technique of diving it off. Put out full flap, and point the nose at the ground: with the barn-door-like flaps out, the speed won’t get above 90kts, while the height just reels off, quickly getting down onto the PAPI-indicated glide slope.
The same things apply as last time for the landing: bring the speed back to 60kts over the fence, and the flare works just nicely. There was a bit of crosswind - not much, but enough for me to demonstrate rudimentary ability on the rudder. Once down on the runway, there’s not as much margin on Wycombe’s runway for a touch-and-go as there is on Oxford’s. If the landing is more than slightly long, the right call is to hit the brakes and stop, as I had to once: fortunately, at Wycombe the taxyway is parallel to the runway, so you’re quickly taking off again after stopping. After the takeoff, on reaching the end of the runway, take a substantial turn left to 020 degrees for noise abatement - then on reaching 600ft QFE (which comes up very quickly), turn left again to due north, towards the Golden Ball, look out for circuit altitude… and it’s back onto downwind.
Reporting downwind, there were a number of times when Tower informed us of conflicting traffic joining base from the north. This traffic was surprisingly easy to spot, but if you see it’s going to end up too close to you in the circuit, what do you do? Well, you can either deviate slightly north of the circuit, but if that’s still going to bring you in too close behind to be confident of having a clear runway to land on, the alternative is to extend the circuit beyond Frieth, flying the 24 circuit in reverse. This is straightforward, and gives you a nice easy-going 2.5 mile final approach to get everything lined-up and stable.
In all, I did about six circuits, one of which was a go-around because I got too close to a Cessna in front of me, tootling along at barely 60 knots. The last landing was on grass, which I flared a bit late for, but fortunately my speed was right at the time (about 60 knots) and I pulled back hard enough to get the nose into the right position, so the touch-down was no more than a positive but moderate thump. Otherwise, it all worked pretty well. Although the crosswind wasn’t severe, my rudder co-ordination was adequate to put the plane down straight every time, just about every touch-down had the stall warner blaring (good), and some were quite smooth. Not bad.
And best of all, at the end of it the instructor said that now, the thing for me to do was to practice on my own! All that remains is for me to pick up the keys - and wait for WM to return from its annual - and I’ll finally have access to the plane on my own terms.
