Monday 27 July 2009

One step closer...

and another sticker in the log book.

The latest one declares that I have successfully completed the CPL Cross Country Syllabus and passed the cross country flight test. :)

After not being anywhere near an aircraft for almost a month due to weather and prior commitments, I got a call from CFI Rob last wednesday... "Long range forecast looks good for the weekend, let's go flying!"

Saturday was just too good a day not to go flying. Light winds, and visibility forever.

I flight planned Ardmore (NZAR) - Hamilton (NZHN) - Taumarunui (NZTM) - Taupo (NZAP) - Ardmore (NZAR).

Being a cross-country flight test, I knew that out of all of those, I was likely to only visit Hamilton (and Ardmore :P) and everything else would be a combination of lost procedures and diversions!

We started with a simulated engine failure after take-off (yay... lots of sports fields and paddocks off the end of runway 21!) and then headed for Hamilton. We made it in and out of NZHN relatively unscathed... and then we started the various "fun activities" that Rob had planned.

First of all we had the forced landing, cunningly disguised as "a ground speed check". Obviously I was caught a little off-guard, but I did OK. It was not great and I got a little low, but I made my field. Climbing out, Rob handed me the instrument hood. This is where the lack of currency really showed. I got the leans about 3 seconds after putting the hood on and it took me a minute or two to really get on top of the aircraft :(

We flew around for 10 or 12 minutes at which point Rob told me to take the hood off. My first reaction was "How the !@#$@# did I get into this valley?" We were at 1700' and had been holding a steady altitude the entire time I was under the hood, as I was in this bowl shaped valley, completed surround by hills that were higher than we were flying!!

My next reaction was "Where the $##@$^ is this valley?" when Rob said to me "Ok, remain at 1700' and tell me where we are and what that town over there is called."

We circled over the top of the town, while I put my "Lost Procedures" into practise... "Ok, about 10 minutes flying at roughly 90kts, should put us around 15nm from where I put on the hood... we were mainly flying headings from 090 to 130 magnetic... so that should put us in this general area on the map..."

"How can you confirm that?" asked Rob.

"Ok, we have a railway line over there... some transmission lines... and the road following the railway line and then curving away through the valley while the railway goes through a tunnel. That would match up with these features on the map... so we are here and that town is XXXXXXXX." (removed to keep it secret for future victims... errr I mean students -ed.)

"Excellent" said Rob, "Spot on!"

I must at this point give a big shout out to Trevor for giving me the low down on lost procedures. Despite knowing where this spot is, he had refused to tell me... no matter how much bourbon I offered! ;)

But his advice of noting the time when entering IFR, so I could calculate the time spent in IFR conditions, plus keeping tabs on the general direction of flight so as to be able to narrow down the area on the map was spot on.

Rob then instructed me to set course for Tokoroa, work out how far it was and how long it was going to take to get there. So out came the map, a rough course hand drawn and heading worked out. Distance calculated using fingers (2 of my fingers = 10nm ;) 30 nautical miles at roughly 90kts will take us around 20 minutes. I called up Christchurch Information to amend our flight plan, give them our rough ETA at Tokoroa[1] and amend my SARTIME.

After Tokoroa, it was VFR nav back to Ardmore, doing ground speed checks and amending my ETA at Ardmore[2] all while avoiding controlled airspace around Hamilton and trying really hard to ignore the cramp that was developing in my bum from being stuck in a 152 for 3 hours!!!

After landing, we debriefed over a cup of tea at which point Rob said somewhat matter of factly "oh.. by the way... you passed" and shook my hand ;)


This Flight: 3.0 Dual (0.2 IFR)
Total Hours: 212.0 (94.9/92.8 Day, 8.6/15.7 Night, 7.4 IFR)

[1] - My mental arithmetic was actually not too bad... I was only off by about 1 minute ;)
[2] - You get +/- 2 minutes for your ETA's at CPL level... I was bang on ;)

Tuesday 7 July 2009

One engine good, Two engines better?

Not necessarily!

Saturday, I was back in the Sim at Waikato Aero Club, watching Trevor get back up to speed with Multi-Engine flying...

Light twins don't traditionally cope too well with an engine failure... and watching what happens when one dies was certainly a wakeup call!

As the old saying goes "When one engine fails on a twin-engine aircraft, you always have enough power left to get you to the scene of the crash."

In a single engine aircraft, when it all goes quiet, you're basically a glider and the aerodynamics are pretty much the same (minus of course the thrust). The aircraft will generally fly pretty straight... but, of course, not so much level! ;-)

In a twin, when one engine goes out, everything changes. The thrust line is now offset from the centreline of the aircraft (asymmetric thrust), with the result being that it wants to constantly yaw left or right, depending on which engine has died, as one side of the aircraft is trying to fly faster than the other!

You're then left trying to troubleshoot while trying to maintain control of an unstable aircraft... and for added fun, you can try it with only reference to instruments!

The idea of keeping aviation as a 'fun hobby' is starting to look more and more appealing! :-/

Following the sim session, I almost scored a ride in the back of WIT (WAC's newish Archer III), but unfortunately, they were pushing a little close to maximum weight as it was full of fuel :(

Meanwhile, I'm hoping to catch some nice weather soon so I can get the Cross-Country Syllabus completed and tick another of the CPL boxes!