AD for 14,000 Cessna 172, 182, 206, 207, and 210 models
"The FAA has proposed an AD involving 14,653 U.S. Cessna 172, 182, 206
and 210 models after cracks were found in the lower area of the forward
cabin doorpost bulkhead. That’s where the wing strut attaches and the AD
requires repetitive inspections of the area. After
one owner reported finding cracks, more inspections revealed them in about
50 more aircraft. “It has been determined that the cracks result from metal
fatigue,” the AD says. A list of affected aircraft is here: https://www.gpo.gov/fdsys/pkg/FR-2018-02-01/pdf/2018-01923.pdf."
Wow, that's a lot of aircraft. There's a lot of vintage Skyhawks made in
the 60's, 70's and 80's flying around that make up a major part of the
single engine fleet. Some companies are refurbishing the old planes and
selling them like new planes. However, under the pretty paint jobs and
cabin make-overs, you still have an airframe that's over 40 years old.
In terms of automobiles, 14,000 is a small percentage of vehicles. But
for Cessna airplanes, it's a huge number. Think about it. The total number
of Skyhawks ever built is around 44,000 and that is the highest number
of single engine planes ever built since 1955. A unique feature about aluminum
is that all aluminum parts have a fatigue limit. Unlike steel parts that
are designed within a specified load limit, it will have no fatigue limit.
"Structural metals such as aluminum and copper do not have a distinct cyclic
limit and will eventually fail even from small stress amplitudes."
In February 2-17-18:
The density altitude was minus 2,000 feet. Typical for this time
of the year. The commuter traffic formed a solid white line heading north
on the Spaulding Turnpike and southbound on 95. Remember, when you transit
Delta airspace make sure you have established radio contact before you
cross the imaginary dash line. However, when you exit they may say goodbye
or just abandon you and not say anything.
Have you seen the FAA
hotspot publications lately? If you haven't looked at an airport diagram
for a while, you might be wondering what are those "HS 1" and "HS 2" markings
are all about. The airport diagram itself won't tell you anything. You
need to go to another FAA publication for an explanation. And then, you
need to go to a pdf file to find out the meaning of a particular HS marking.
Have you noticed that Portland now has two HS markings. Maybe we should
have hotspot markings on TomTom and Magellan automotive gps devices to
alert drivers of their dangerous driving habits. The speed limit in front
of my house is 30, but many vehicles are speeding over 50. I'll give that
a big "HS 1".
HS could also stand for "Holy Mackerel."
225 Meeting This Evening 2-13-18:
From the EAA newsletter: "This meeting we need to talk about our
summer events. Peter has been at the wings and wheels meeting and I'm looking
forward to the latest information. If anyone has contacts in local EAA
chapters it would be a good time to discuss getting in touch with them.
The wings and wheels show from past experience brings in a ton of kids.
It would be great to have a crowd of pilots to fly young eagles! "
Systems' newest drone; the MAGMA 2-8-18:
BAE and the University of
Manchester have announced the first successful flight on December 13. The
design has no moving control surfaces? Yes, they say they are using
two newly developed systems to navigate in the air; wing circulation control
(WCC) and fluidic thrust vectoring (FTV). It looks like the WCC replaces
the ailerons and the FTV replaces the elevator. Apparently they don't need
rudder control. Or do they?
To Nowhere 2-7-18:
Yes, it's still very much winter in New England. Looks like this storm
goes from here to Mexico .This page from the GFA leaves no doubt about
what's going on. I think I'll go put some gas in my snowblower.
at 3000 49 knots? 2-1-18:
So I went for a little ride the other day and on myway
to Sanford airport I'm indicating 120 mph airspeed and the GS on the GPS
was reading 144 knots. Looking at the winds aloft before take-off the report
showed winds at 3000 at 49 knots. But on the ground the wind was reported
light and variable at 4 knots. Climbing out from the light and variatble
ground wind to the unusually fast winds at 2000 feet was relatively smooth
and uneventfulll other than a remarkable ground of 165 mph. Not to bad
for a 160 hp Skyhawk. On the left and right are screen captures of the
KDAW and KSFM ASOS and winds aloft from the Avare app on a Samsung Galaxy