Today's Message Index:
----------------------
1. 12:07 AM - Re: New FAA Airworthiness Concern (Aucountry@aol.com)
2. 12:13 AM - Re: OAK_&_SJO_FSDOs_tagging_polished_props? (Aucountry@aol.com)
3. 12:21 AM - Re: Re: (Gil Alexander)
4. 12:21 AM - Re: Fw: New FAA Airworthiness Concern (Aucountry@aol.com)
5. 11:17 PM - Cowling Update 5.4 (Aucountry@aol.com)
Message 1
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| Subject: | Re: New FAA Airworthiness Concern |
--> TeamGrumman-List message posted by: Aucountry@aol.com
In a message dated 08/07/03 06:38:11 PM, rblevy@mindspring.com writes:
An owner/operator reported that during a routine inspection, the horizontal
stabilizer was noted to be "loose." Further inspection revealed cracks in
all four corners of the horizontal stabilizer forward-spar-carry-through
torque box. Additionally, a vertical torque box member was cracked and
"buckled" adjacent to the attachment.=A0 The concern is two-fold. First, there
is concern that the condition would not be discovered during routine annual
inspection. Second, if uncorrected this condition would likely result in
control difficulties. Total loss of control is possible.
> Request for Information:
>
> Your response to these questions is highly valued and significant in our
> determination of possible future corrective action. Please be as complete=20as
> possible when you reply.
>
> 1.) Would the above-described buckling be discovered during routine
> annual or
> 100-hour inspections? Have you seen buckling here?=A0 If yes, did the aircraft
> have any other damage or damage history (i.e. hard landing, wing tip strike,
> broken tail tie down, etc)?
> ----- Many years ago, long before I became an A&P, .I was helpng a guy do
an annual on a Piper and he noticed some cracks in the area of the horizontal
stabilizer mounting. As a result, I keep looking in the area of the
attachments on the horizontal just to see if I can find any evidence of movement
of the
associated pieces. To date, I have never seen anything that would suggest
this to be a problematic area.
> 2.) Would the above-described cracks be discovered during routine annual
> or
> 100-hour inspections? Have you seen cracks here? If yes, did the aircraft
> have any other damage or damage history (i.e. hard landing, wing tip strike,
> broken tail tie down, etc)?
> ----- Well, now, without seeing the damage for myself, I can't honestly say
if I could or could not see it. It sounds to me like a plane that has been
seriously abused. Like all those Pipers needing their wings inspected because
a few pipeline planes had cracks, I suspect the plane was probably involved=20in
an unreported incident or flown ouside its design limits.
> 3.) Have you found loose forward stub spar or vertical stabilizer
> attachment
> bolts? If so, please specify.
> ------- No
> 4.) If you have seen buckling, cracking and/or loose bolts please advise
> model
> number, serial number, time in service and date found.
> ------- No
> 5.) Please provide any suggested wording changes for the maintenance
> manual
> regarding inspection of this are to improve detection of cracks and/or
> buckling in this structure.
> ------- During my inspections, I generally look for any 'soot-like' residue
which might result from metal surfaces working together. I also look for any
surface corrosion or defects. Then, I wipe down the area with a wax and
grease remover. It's very difficult to reach or to see very easily, even with
a
mirror. After I've wiped it down pretty well, I look for lifted paint/primer
which might indicate corrosion. I check for excessive rust on the bolts
(never seen anything worth noting). I check for hairline cracks in the normal
areas around the bolts, but more importantly, I look for cracks where there=20are
bond lines, where there is a thickness change (doublers, lap joints, etc.)
and wherever a sharp, inside corner, exists on anything.
> 6.) Please provide any economic data associated with increased attention
> to
> visual inspections in this area during annual inspections.
> -------- Since I do this as part of the annual, I usually allow about an hour
and a half to remove the tail-cone, ELT covers, and in some cases, the ELT or
whatever else has been mounted in the way of getting light and mirrors in the
back. Seriously, it's all done with mirrors.
Gary
www.AuCountry.com
Home of "Team Grumman"
TeamGrumman-List@matronics.com
http://www.matronics.com/subscribe
Message 2
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| Subject: | Re: OAK_&_SJO_FSDOs_tagging_polished_props? |
--> TeamGrumman-List message posted by: Aucountry@aol.com
In a message dated 08/08/03 04:32:52 PM, n76lima@mindspring.com writes:
> There are a number of clears that work quite well over polished aluminum,
> and there is a "clear" alodine that doesn't turn the metal golden brown so
> you can acid etch and alodine for corrosion protection before paint.=A0
>
That brings up an interesting prospect. What about clear anodizing?
Anodizing creates an incredibly durable, corrosion resistant surface without paint.
Message 3
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OAK_&_SJO_FSDOs_tagging_polished_props?
--> TeamGrumman-List message posted by: Gil Alexander <gilalex@earthlink.net>
Gary
... I believe anodizing would bring up many surface brittleness
issues. The hard surface (that's why it's durable) would then have
different properties than the main body. When a prop is "overhauled", they
sand off the surface layer to make the whole prop more
"uniform". Anodizing would be the exact opposite....
gil in Tucson
At 03:12 AM 8/9/2003 -0400, you wrote:
>--> TeamGrumman-List message posted by: Aucountry@aol.com
>
>
>In a message dated 08/08/03 04:32:52 PM, n76lima@mindspring.com writes:
>
>
> > There are a number of clears that work quite well over polished aluminum,
> > and there is a "clear" alodine that doesn't turn the metal golden brown so
> > you can acid etch and alodine for corrosion protection before paint.=A0
> >
>
>That brings up an interesting prospect. What about clear anodizing?
>Anodizing creates an incredibly durable, corrosion resistant surface
>without paint.
>
>
Message 4
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| Subject: | Re: Fwd: New FAA Airworthiness Concern |
--> TeamGrumman-List message posted by: Aucountry@aol.com
In a message dated 08/08/03 11:48:37 PM, gilalex@earthlink.net writes:
> Gary,
>=A0 Isn't this easily accessible, and viewable,=A0 when you take off the
> two ELT access panels?=A0 I am I mixing up the "torque box" with something
> else??
>
Easily? No, not really. It would be nice if the whole tray were
removable.
Message 5
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| Subject: | Cowling Update 5.4 |
--> TeamGrumman-List message posted by: Aucountry@aol.com
I think that's the right update.
Well, the cowling is painted, it's got all the baffle seals in place, the
cowling is on the plane, ... so, what's the holdup? you ask.
Cam-locks. I know nothing abouot cam-locks except they need a quarter turn
to latch or unlatch. So, the cam-locks I ordered were a mixed bag of what I
thought I needed. When we went to install them this morning, we realized we
need all the same style/model parts. So, a quick trip to Aircraft Spruce for
parts. Only, problem was, I gave the guy at AS the premarked catalog, with
what I thought were the correct parts, only to find that I'd circled the wrong
recepticale. Again.
So, we'll get the right parts on Monday.
Close. So Close.
Gary
www.AuCountry.com
Home of "Team Grumman"
TeamGrumman-List@matronics.com
http://www.matronics.com/subscribe
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