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Date: Thu, 02 Feb 2012 07:34:55 -0500
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From: cwfmd@yahoo.com
Subject: RE: LML IV-P Door
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Would=A0the IV-P door open in flight, if unlocked from a latched, initial c=
ondition?. With ground tests only, here in the hangar, it seems like Bernou=
lli's forces,=A0pulling outward=A0against the large surface area of the doo=
r,=A0against the=A0latch, would cause the lower hooks to remain engaged, ev=
en after the handle is fully open.. On the ground,=A0try (pushing or)=A0pul=
ling outward on the door to simulate this=A0negative pressure(inflight). It=
 seems like the lower=A0latch hooks=A0could jam and interfere with a bail o=
ut attempt. This seems to be the result. if you go from fully latched, to u=
nlocking the handles. I wonder if the incidents mentioned might have happen=
ed from a completely unlatched condition on takeoff? This is also more like=
ly scenario, to strike the right flap?
=A0A concise description of such an=A0inflight experience, and your observa=
tions of the sequence,=A0would be very useful. Do vibrations or oscillation=
s cause the door to separate? Was there=A0some other=A0structural failure o=
f the door, causing it to open? When did it happen in the sequence of event=
s? =A0It would be important guidance,=A0in designing or considering=A0bailo=
ut systems or egress methods, inflight.
Thanks
Bill Miller
=A0
From:=20

"Jeff Edwards" <vtailjeff@aol.com>


To:=20
lml@lancaironline.net


If it hits the tail you will probably lose the aircraft.


AvSafe=A0Jeff Edwards
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<table cellspacing=3D"0" cellpadding=3D"0" border=3D"0" ><tr><td valign=3D"=
top" style=3D"font: inherit;"><DIV class=3Dlabel>Would&nbsp;the IV-P door o=
pen in flight, if unlocked from a latched, initial condition?. With ground =
tests only, here in the hangar, it seems like Bernoulli's forces,&nbsp;pull=
ing outward&nbsp;against the large surface area of the door,&nbsp;against t=
he&nbsp;latch, would cause the lower hooks to remain engaged, even after th=
e handle is fully open.. On the ground,&nbsp;try (pushing or)&nbsp;pulling =
outward on the door to simulate this&nbsp;negative pressure(inflight). It s=
eems like the lower&nbsp;latch hooks&nbsp;could jam and interfere with a ba=
il out attempt. This seems to be the result. if you go from fully latched, =
to unlocking the handles. I wonder if the incidents mentioned might have ha=
ppened from a completely unlatched condition on takeoff? This is also more =
likely scenario, to strike the right flap?</DIV>
<DIV class=3Dlabel>&nbsp;A concise description of such an&nbsp;inflight exp=
erience, and your observations of the sequence,&nbsp;would be very useful. =
Do vibrations or oscillations cause the door to separate? Was there&nbsp;so=
me other&nbsp;structural failure of the door, causing it to open? When did =
it happen in the sequence of events? &nbsp;It would be important guidance,&=
nbsp;in designing or considering&nbsp;bailout systems or egress methods, in=
flight.</DIV>
<DIV class=3Dlabel>Thanks</DIV>
<DIV class=3Dlabel>Bill Miller</DIV>
<DIV class=3Dlabel>&nbsp;</DIV>
<DIV class=3Dlabel>From: </DIV>
<DIV class=3Ddetails>
<DIV class=3Dabook><SPAN class=3Demail>"Jeff Edwards" &lt;vtailjeff@aol.com=
&gt;</SPAN></DIV>
<DIV class=3DclearFloat></DIV></DIV>
<DIV class=3DclearFloat></DIV>
<DIV class=3Drow>
<DIV class=3Dlabel>To: </DIV>
<DIV class=3Ddetails>lml@lancaironline.net</DIV>
<DIV class=3DclearFloat></DIV></DIV>
<DIV style=3D"PADDING-BOTTOM: 5px; PADDING-LEFT: 5px; PADDING-RIGHT: 5px; P=
ADDING-TOP: 5px" _yuid=3D"yui_3_1_1_2_1328114169407103">
<DIV id=3Dyiv140008936>
<DIV>
<DIV _yuid=3D"yui_3_1_1_2_1328114169407101">If it hits the tail you will pr=
obably lose the aircraft.<BR><BR>
<DIV><SPAN>AvSafe</SPAN>&nbsp;</DIV>Jeff Edwards</DIV></DIV></DIV></DIV></t=
d></tr></table>
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