Spins

wrote:
On Jan 17, 5:22 pm, Bob Moore wrote:
wrote

The 172 N Model I fly from time to time is only approved (and thus was
only tested) for spins when CG falls within the utility category.
Though it may be recovered from a spin when loaded within the normal
category range, it was not certificated that way. Which tells me there
is no assurance of recovery.
BULL****!!

Section 23.221: Spinning.
(a) Normal category airplanes. A single-engine, normal category airplane
must be able to recover from a one-turn spin or a three-second spin,
whichever takes longer, in not more than one additional turn after
initiation of the first control action for recovery, or demonstrate
compliance with the optional spin resistant requirements of this
section.

(1) The following apply to one turn or three second spins:

(i) For both the flaps-retracted and flaps-extended conditions, the
applicable airspeed limit and positive limit maneuvering load factor
must not be exceeded;

(ii) No control forces or characteristic encountered during the spin or
recovery may adversely affect prompt recovery;

(iii) It must be impossible to obtain unrecoverable spins with any use
of the flight or engine power controls either at the entry into or
during the spin;

I would suggest that you read the entire FAR section 23.221 for Normal,
Utility, and Aerobatic category aircraft.

Bob Moore
ATP CFI

I've read the FARs.

I've also read the POH, which states "Spins approved when loaded
within utility category."

I'll see your Bullchip and raise you three chickships.

Dan

Dan

You're arguing with the wrong guy Dan, and you are going to lose your
three chickships whatever the heck they are :-)))

.. Bob's right and you are wrong. You seem to be hung up on the fact that
because the POH states that spins are approved only in the Utility
category, that this means the airplane can't be spun in the Normal
Category. This simply is not true AERODYNAMICALLY which is the ONLY
context we are discussing here. LEGALLY it can't be spun in the Normal
Category but otherwise it will spin just fine in the Normal Category;
unless you have an aft cg issue and then it's up for grabs either normal
or utility category.
Naturally, if your 172's POH says that spins are not approved in the
Normal Category, that's exactly what it means. It means that spins are
not APPROVED in the Normal Category.
It does NOT mean the airplane won't spin in the Normal Category. It most
certainly will spin, and as both Moore and I have both attempted to tell
you, that 172 in fact had to meet a spin requirement to be licensed in
that Normal Category.

--
Dudley Henriques