JAR 22 STANDARDS

[Gordon Schubert]

Could someone explain the logic behind the JAR 22 standards.
I just sold an L33 Blanik. Maximum pilot weight per
the manual was 283 lbs. but according to JAR 22 could
only be 242 lbs. Which is legal? Why have two different
weights? I suppose this could make sense to me if there
was a standard set to have a max pilot weight for competition,
but why set the weight at 242 lbs if the glider was
designed and suitable for someone 283 lbs? Doesn't
make any sense to me!!


GORDY

[Bob Kuykendall]

Earlier, Gordon Schubert wrote:

>Could someone explain the logic behind the JAR 22 standards.
>I just sold an L33 Blanik. Maximum pilot weight per
>the manual was 283 lbs. but according to JAR 22 could
>only be 242 lbs. Which is legal?

The way I read JAR 22.25(a)2, the 242 lb (110 kg) limit
is the _minimum_ possible maximum pilot weight for
a certificated single-seat glider.

That is, you're generally not allowed to certificate
a single-seat glider unless the maximum pilot weight
is at least 110 kg. For a two-seater, the minimum possible
maximum crew weight is 180 kg (396 lbs). To read the
rule itself, see the Canadian version of JAR 22:

http://www.tc.gc.ca/aviation/regserv/carac/CARS/cars/522/suba_b.ht
m#522.25

I believe that manufacturers are completely at liberty
to develop and certificate gliders that have greater
maximum pilot and crew weights than those established
as minimums by JAR 22.25(a)2. From what you describe,
that seems to be the case with the L-33.

However, it seems that the majority of manufacturers
have chosen to certificate their gliders for the minimum
allowable maximum pilot and crew weights allowed under
JAR 22.25(a)2. That's probably a business decision
on their part based on who they see as their target
market. Given that the US, which probably has the largest
concentration of certificated pilots above 110 kg,
constitutes only about 15% of the worldwide market
for sailplanes and equipment, typical manufacturers
probably see it as a sound decision.

Thanks, and best regards to all

Bob K.
http://www.hpaircraft.com/hp-24

[Bob Kuykendall]

Earlier, I wrote:

> ...To read the rule itself, see the Canadian version of JAR 22:

Let's try that link again, since it got broken in my first post:

http://www.tc.gc.ca/aviation/regserv/carac/CARS/cars/522/suba_b.htm#522.25

Pared down to the relevant paragraphs, JAR 22.25(a)2 reads:

: 522.25 Weight Limits
:
: (a) Maximum weight. The maximum weight
: must be established so that it is:
:
: (2) Not less than the weight which
: results from the empty weight of
: the glider, plus a weight of occupant(s)
: and parachute(s) of 110 kg for a
: single seat glider or 180 kg for a
: two seat glider, plus the required
: minimum equipment, plus any expendable
: ballast and for a powered glider
: sufficient fuel for at least half
: an hour of flight at maximum continuous
: power.

Thanks again, and best regards to all

Bob K.
http://www.hpaircraft.com