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Date: Wed, 21 Mar 2012 08:47:06 -0400
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From: Gary Casey <casey.gary@yahoo.com>
Reply-To: Gary Casey <casey.gary@yahoo.com>
Subject: Crankcase "venting" after flight
In-Reply-To: <listdigest-5450103@logan.com>
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The other day, I watched someone taxi up and the first thing he did was ope=
n the oil door and take off the cap. =A0I (politely, of course :-) asked hi=
m why he did that, to which he replied, "look at all those fumes - I'm lett=
ing them out." =A0And I then read in the last Lancair post, "....=A0and cra=
nkcase always vented after flying." =A0Is this a normal thing to do? =A0In =
40 years of flying I've only seen it done once and never heard of the pract=
ice before or since. =A0I can't imagine that opening the cap does much to c=
hange the atmosphere in the crankcase. =A0Is there any test data or theory =
to support the practice? =A0I'll admit that I'm a bit paranoid - If I check=
 the oil and find I need some, I'll carefully replace the cap (assuming the=
 dipstick is part of the cap), go get the oil and then take the cap back of=
f to pour it in.=0A=0AI try to never walk away, leaving anything in an unai=
rworthy condition assuming I'll come back and fix it later. =A0Maybe it goe=
s way back to when someone took off from the local airport, noticed oil com=
ing from the cowling (of a twin), realized that he had left off an oil cap,=
 shut the engine down, overflew several good airports to come back, came in=
 high, made a go-round, botched it, and you know the rest. =A0One of the we=
ll-known test pilots did my first flight. =A0He was casually (correction - =
I don't think anything he does is "casual") watching me replace the plugs. =
=A0I hand-tightened the wires and walked away to get a wrench. =A0He about =
had a heart attack and chastised me for walking away with parts of the plan=
e looking like they were attached, but weren't. =A0He said "get the wrench =
first, then put the wires on."=0A=0AGary Casey
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<html><body><div style=3D"color:#000; background-color:#fff; font-family:bo=
okman old style, new york, times, serif;font-size:12pt"><div style=3D"font-=
family: 'bookman old style', 'new york', times, serif; font-size: 12pt; ">T=
he other day, I watched someone taxi up and the first thing he did was open=
 the oil door and take off the cap. &nbsp;I (politely, of course :-) asked =
him why he did that, to which he replied, "look at all those fumes - I'm le=
tting them out." &nbsp;And I then read in the last Lancair post, "....<span=
 class=3D"Apple-style-span" style=3D"color: rgb(69, 69, 69); font-family: a=
rial, helvetica, sans-serif; font-size: 13px; ">&nbsp;and crankcase always =
vented after flying." &nbsp;</span>Is this a normal thing to do? &nbsp;In 4=
0 years of flying I've only seen it done once and never heard of the practi=
ce before or since. &nbsp;I can't imagine that opening the cap does much to=
 change the atmosphere in the crankcase. &nbsp;Is there any test data or
 theory to support the practice? &nbsp;I'll admit that I'm a bit paranoid -=
 If I check the oil and find I need some, I'll carefully replace the cap (a=
ssuming the dipstick is part of the cap), go get the oil and then take the =
cap back off to pour it in.</div><div style=3D"font-family: 'bookman old st=
yle', 'new york', times, serif; font-size: 12pt; "><br></div><div style=3D"=
font-family: 'bookman old style', 'new york', times, serif; font-size: 12pt=
; ">I try to never walk away, leaving anything in an unairworthy condition =
assuming I'll come back and fix it later. &nbsp;Maybe it goes way back to w=
hen someone took off from the local airport, noticed oil coming from the co=
wling (of a twin), realized that he had left off an oil cap, shut the engin=
e down, overflew several good airports to come back, came in high, made a g=
o-round, botched it, and you know the rest. &nbsp;One of the well-known tes=
t pilots did my first flight. &nbsp;He was casually (correction - I
 don't think anything he does is "casual") watching me replace the plugs. &=
nbsp;I hand-tightened the wires and walked away to get a wrench. &nbsp;He a=
bout had a heart attack and chastised me for walking away with parts of the=
 plane looking like they were attached, but weren't. &nbsp;He said "get the=
 wrench first, then put the wires on."</div><div style=3D"font-family: 'boo=
kman old style', 'new york', times, serif; font-size: 12pt; "><br></div><di=
v style=3D"font-family: 'bookman old style', 'new york', times, serif; font=
-size: 12pt; ">Gary Casey</div>  </div></body></html>
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