On Tue, 01 Aug 2006 11:57:10 GMT, Bob Moore
wrote in ::

A lot of those placards, markings, and manual limits are just
because the manufacturer did not want to spend the time and
money in order to seek certification for a particular item.

Such is the case of the "no slips with flaps" contained in the
manual for a lot of the C-172s.

From: (Jackie Murray)
Newsgroups: rec.aviation.piloting
Subject: Cessna 172 slips with flaps
Date: 5 Jul 1994 15:06:35 -0400
Message-ID:
NNTP-Posting-Host: 141.114.130.70


I know this has been beaten to death, but I just received an article
from AOPA about the C172 and there is a reference to this problem.

Article: "Anatomy of a Success" (The makings of a winner) by Thomas A.
Horne, AOPA Pilot in May, 1992. In describing the phenomenal success
and popularity of this plane when introduced in 1955, the author says
this:

"There was -- and still is -- one handling quirk: In a forward slip
with flaps extended, a 172 could pitch nose down, violently enough to
push a pilot against his seat belt. This is caused by an upturned
aileron's reducing the normally strong downwash of air over the
horizontal tail. Though puzzling in its infrequency, Cessna saw the
potential for trouble. Consequently, a placard is installed near the
flap control: Avoid slips with flaps extended."

Message-ID:

An added note in this article...I am still reading it....in 1972 the
'dorsal fin was extended all the way forward to the rear window. This
helped virtually eliminate the nose-down pitch problem in sideslips
and made the airplane much more spin resistant....Cessna received
complaints from some flight instructors because of this
characteristic. Demonstrations of fully developed (three-turn) spins
were difficult to perform; result was usually a spiral"