I can vouch for this too. I have done load calculations for FAR part 23
aircraft.
The current FARs don't refer to these abbreviations anymore, but the
calculations are the same. And if you find any old books or old people who
have done the work in the past, this is still the common verbage that is
used.

Joe


"Jan Carlsson" wrote in message
...
Ron,

The PHAA is english and means Positive High Angle of Attack.

PLAA is Positive Low angle of attack,

It is used in the flight envelope FAR part 23

PHAA is at VA and PLAA is at VD

Negative is inverted flight.

Jan Carlsson
half and half Swed/Fi

www.jcpropellerdesign.com

"Ron Wanttaja" skrev i meddelandet
...
I received a package that includes the original Finnish report for the
FAR-23-like load testing of a Fly Baby in 1977. At that time, the
Finnish
National Board of Aviation required formal testing of homebuilts just
like
production aircraft.

Fortunately, the package includes a translation into English.
Unfortunately, there are some terms that were apparently Finnish
abbeviations/acronyms that were left untranslated. These we

P.H.A.A.
P.L.A.A.
N.L.A.A.

These terms are always the labels for a row of numbers. For instance,
under "Center of Pressure" it reads:

P.H.A.A. 25%
P.L.A.A. 40%
N.L.A.A. 25%

and under "Load Factor" it says,

P.H.A.A. 4.5
P.L.A.A. 4.5
N.L.A.A. 2.0

For the "Normal Chord Load," values are given for each of the three
items
for the Net Beam Load, the Chord Beam Ratio, the Chord Load per Inch,
etc.

I'm thinking that these are describing either flight conditions (at
cruise,
at stall, etc.) or loading conditions (forward CG, aft CG, etc.).

On a couple of the tables, the three parameters have a fourth added as a
row label: "Dive".... This is why I suspect the abbreviations might be
for
flight conditions.

The question is, does anybody know the translations of the terms? Or,
given the above clues, can anybody give me a good educated guess?

Ron Wanttaja