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20 Are slips with flaps prohibited in certain Cessnas?




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This article is from the Aviation FAQ, by Geoffrey G. Peck geoff@peck.com with numerous contributions by others.

20 Are slips with flaps prohibited in certain Cessnas?

No. Some Cessna 172's have a recommendation that extended slips with
full flaps be _avoided_. This is because the flaps on these aircraft
are sufficiently effective to partially blanket the empennage during a
full-flap slip, which may result in a gentle, but fully controllable,
bobbing motion. That bobbing motion has on more than one occasion
unduly alarmed a pilot on short final, resulting in a less than
satisfactory outcome. Bottom line: go up to altitude and try it
yourself, with a CFI aboard if you prefer. Then you won't need to worry
about the recommendation. [Disclaimer: if the POH for your specific
aircraft says something different, the POH takes precedence over this
note. Certain C-170s are reported to have such a prohibition, because
they exhibit "exciting" descents in this configuration.]

 

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