f4ffm2(at)adelphia.net
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 Posted: Sat May 12, 2007 5:46 am Post subject: The REST of the story. |
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Hi Jorgen,
Thanks for getting the real story. It is an incident from
which we all can learn something.
Knowing the actual cause is much better than having to
speculate about what went on. Thanks for your effort and time.
Roger___________________________________________________________________
__________________
On May 12, 2007, at 3:19 AM, Jorgen Nielsen wrote:
| Quote: |
<jorgen.nielsen(at)mweb.co.za>
OK here goes - just got off the phone with the owner of the Yak
that got
chopped up.
The other Yak pilot (that ran into the parked Yak) had a air low
problem
before startup. They then handpropped the aircraft. There was
apparently
enough air to taxi / brake. During the taxi the air obviously got
depleted
faster than it was being replenished, and suddenly brakes did not
work, and
she ran into the yak in front.
The mags were not switched off before impact. The emergency air for
gear/brakes was not deployed.
My analysis:
Contributing factors - low time on the Yak.
Seeming lack of familiarity of the systems.
Formo training environment probably contributed (i.e. looking at other
aircraft instead of keeping a beady eye on the air pressure gauge
during
taxi).
This incident could have been avoided if:
1. the pilot had charged the air system on the ground
2. the pilot had waited for air pressure to rise substantially
before taxi.
3. the pilot had monitored the air pressure.
4. the pilot deployed emergency air
5. the pilot turned the engine off.
Bottom line. Know your aircraft and systems, follow the
procedures, and do
not get pressured into flying if things are not 100%.
Jorgen
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