PowerFLARM questions

Andy,

I know the EWMicro doesn't attach to the static port. I think it would be considered a "new" logger. So, it must not be "required."

Wayne
http://www.soaridaho.com/


"Andy" wrote in message ...
On Oct 31, 12:44 pm, Darryl Ramm wrote:

I thought new flight recorders were allowed, even required, to be
connected to a static port. This eliminates the differences between
the logger and the altimeter due to speed changes. Not sure when the
requirement changed but it has been discussed here before.

So the real question is will the blind PowerFLARM have a static
connection.

Andy

On Nov 1, 10:08*pm, "Wayne Paul" wrote:
Andy,

I know the EWMicro doesn't attach to the static port. *I think it would be considered a "new" logger. *So, it must not be "required."

Waynehttp://www.soaridaho.com/

"Andy" wrote in ...

On Oct 31, 12:44 pm, Darryl Ramm wrote:

I thought new flight recorders were allowed, even required, to be
connected to a static port. *This eliminates the differences between
the logger and the altimeter due to speed changes. *Not sure when the
requirement changed but it has been discussed here before.

So the real question is will the blind PowerFLARM have a static
connection.

Andy

I should have typed my last reply more carefully as well. It is
currently optional for a IGC flight recorder to use either cockpit
ambient or static if the flight recoder is for a fixed install. If it
a portable flight recorder it must use cockpit ambient. The EWMicro is
a portable so would not qualify anyhow.

So to be clear here is the current IGC flight recorder technical
specification language...

"Pressure Altitude - In a GNSS FR, this is a five numeric group
indicating the pressure altitude in metres with respect the
International Standard Atmosphere (ISA) used in aviation, to a sea
level datum of 1013.25 HPa. The pressure recorded in the *.IGC file
may either be "cockpit static" (vented within the FR box), or use a
tube connection to the pressure from glider instrument system static
tubing. If the pressure altitude signal within the FR is used for
other purposes such as cockpit instrument readings which can be set to
other datums such as QNH or QFE, a one-way transmission system must be
used from the sensor so that the IGC file always records the required
ISA to the 1013 sea level datum irrespective of other settings used
for flight instruments. The permitted use of instrument-static is
intended for a GNSS FR mounted in the instrument panel. With such an
installation, an OO as part of the inspection of the FR installation
must check the tubing and the pressure connection to the FR to ensure
that they will be out-of-reach of the aircrew in flight. This is to
prevent alteration to the IGC-file pressure altitude record by any
method. (AL4)"

The OO would also have to check for and seal any alt-static switches/
valves so they can't be used in flight.


Darryl

All this seems to be a very demanding requirement for official
observers.

Chris N

On Nov 2, 4:09*am, Chris Nicholas wrote:
*All this seems to be a very demanding requirement for official
observers.

Chris N

Yes this does increase the work for OO and contest CD in principle.
There are demanding requirements for the OO now depending on the
individual flight recorder approval--like possibly sealing the
recorder to the aircraft in some circumstances. How often do you think
OOs are 1. aware of these requirements for a particular flight
recorder approval and 2. follow them?

The trade-off is do you want to provide pilots with the option or an
IGC flight recorder pressure altitude that is sourced from the static
line (and therefore should line up after QNH calibration better with
their altimeter) or is the extra choice(=possible confusion)/
complexity/hassle not with it?

I'm not aware of any other vendor offeing this - does anybody know of
any. The LX 8000/9000 do not and the C302 does not - they all record
ambient pressure altitude. I just did a quick check and it looks like
the ability to use static line pressure altitude was introduced in the
GNSS Flight Recorder Technical Specifications AL4 ~2001 (not sure of
the exact adoption date - but it was *not* recent).

Darryl