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Bob,
The 1976 C337G I flew had the pump circuits arranged so that if
the reservoir level dropped below a certain point, the pump would not run.
However, the reservoir held enough fluid so that the hand pump could get the
gear down (about 40 strokes). Depending on where the broken fitting
was, even this may not have helped Laurie.
Scott
In a message dated 2/16/2010 8:10:27 A.M. Central Standard Time,
marv@lancair.net writes:
Posted for "Robert Pastusek"
<rpastusek@htii.com>:
Laurie, First of all, a
very nice job of taking care of this emergency! Also, thanks so much
for the report to the rest of us. As you note, these things
always provide useful information, and this one caused me to think
again about my own airplane. Most of my IV-P electrical system is
protected with fuses; the alternators and hydraulic pump being the
exceptions, and with the CB's for these made very readily accessible
for just the situation you encountered. My concern is that you didn't
have sufficient hydraulic fluid to lower/lock the gear with the
manual pump. I determined during construction that the pickup tube
for the manual pump extended lower in the tank than the electric pump
pickup, and just let it go at that. I did not test this at all.
If you have any thoughts about why you
didn't have enough fluid left to use the backup system, I'd be most
appreciative. Could the pitch attitude of the aircraft had an effect?
Other thoughts? Based on your experience, I'm thinking of draining
down my system through the electric pump and then trying the manual
pump. Like I said, I took this one on faith of the designer and did
not test it, although it would have been easy to do
during build. Again, nice job
landing the aircraft, and I'm happy you sustained minimal damage in
the process. Thanks especially for your comprehensive report. If you
find more, especially about why the emergency pump didn't work, we'd
all appreciate hearing. Bob
Pastusek For LOBO
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