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On Oct 16, 12:43 am, Bertie the Bunyip wrote:
wrote in news:1192492570.300275.289550
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On Oct 15, 8:49 am, Bertie the Bunyip wrote:

The examiner wouldn't allow him to slip because he reckons they are
dangerous with the flaps out and that he should wiggle the ailerons
back
and forth to lose height. He didn't even want him to slip clean.

Jesus wept.

This examiner had had a fright in a 172 (this was an archer anyway) and
did not alow anyone to slip with flaps out.
While I am firmly in the camp that says some cessnas can get a litle
fuzzy in pitch with full flaps, this is just stupidity incarnate.

Shoot. We do slips with full flaps all the time in 172s, have
done so for years, and never had a scare. I wonder if that "Avoid
Slips With Flaps Extended" applied to some earlier models? I'll have
to check the TCDS sometime.

Dan

Dunno. the manual in a 172 makes reference to a possibility of degraded
elevator control, but I think it's only a bit of a nod, really.
The Bird dog suffers from this ailment big time, though. it has,
essentially, the 172's wing, but the flaps go to 60 degrees. I can tell
you
first hand that blanking of both the rudder and elevator are a very real
characteristic of that airplane if you slip it ith full flaps. I did it
once close to the ground and never even thought about it again..

Here's what the Type Certificate Data Sheet says:
.................................................. ..................................

D. On flap handle, Models 172 through 172E

(1) "Flaps - Pull to extend
Takeoff Retract 0°
1st notch 10°
Landing 0° - 40°

(2) "Avoid slips with flaps down."

E. Near flap indicator Models 172F (electric flaps) through 17271034,
excluding 17270050)

"Avoid slips with flaps extended."
.................................................. ........................................

The applicable models, 172 through 172F, were built between
1956 and 1964 ('65 model?). There's no mention of the slip with flaps
thing for later models. I wonder if the addition of the back window
changed the airflow enough to keep the elevator flying?

Dan

I believe that the advice against slips with (full) flaps ended when the
maximum flap extension changed from 40 to 30 degrees.

On the very early swept tail 172 (1959 model, IIRC) that I had some time in,
a slip with full flaps resulted in a buffet--but I don't recall that being
done with aft CG at any time that I was aboard.

Peter