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Date: Mon, 28 Jan 2013 12:01:13 -0500
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From: N20087 <n20087@yahoo.com>
Subject: A funny thing happened on short final!

Folks

Yesterday I had quite a start on short final on the ILS into Dulles. My MFD s=
tarted to complain wildly about high EGTs. My high limit is set to 1525 whic=
h I never see in normal operations

All cylinders on my io360 were starting to exceed my red line and climbing r=
apidly.  I had my Dukes boost pump on, my facet belly pump on and pressure w=
as 28psi.  I switched tanks; no change.  Naturally I was thinking about what=
 to do if the fan quits a half mile off the end.  Since I am writing this, i=
t did not quit!  This is the first time I have seen anything like this in 20=
0hrs on the airplane.

By the time I got to the FBO, almost 1.5 mile taxi, I ran the engine up ever=
y which way, mag switch, low power high power etc and could not replicate th=
e problem.  One thing I did notice however was that when I turned ON the Fac=
et at low power (13-15 inches MAP) and with the boost pump on, the line pres=
sure increased from 22psi to 28psi (no surprise there) but the indicated flo=
w rate went from about 5 gal/hr to less than 2 with some noticeable increase=
 in EGT.  That surprised me and I never noticed it before, mainly because I n=
ever have only one of the pumps turned on at a time at takeoff and landing

I pulled the cowl and checked all was normal, no leaks etc. everything tight=
 no ice in the inlet and so on and then buttoned it up and went about my bus=
iness. =20

Fast forward two hours, filed to get out of IAD, thorough engine runup, flip=
ped the Facet pump on and off, same behavior as before.  High power runup wi=
th all pumps, good fuel flow, pressure and    EGTs. Long taxi to runway, dec=
ided on another mag check, all good, so good to go.  Cleared for takeoff, ta=
keoff run fuel flow good 19gph, temps good, rotate, on my way.=20

Approach to home airport 1hr later, did not run backup pump, uneventful appr=
oach, temps normal


So after all this, i am none the wiser on what happened on my approach to IA=
D.  The only thing that was different from what I might have done in the pas=
t is that ATC asked me to hustle since I had a heavy in trail.  I was slidin=
g down the ils banister at 140kias until 3 miles out and it was shortly afte=
r that that things went pear shaped.  So I am thinking I had the throttle ne=
arer to idle than usual and the engine was likely being driven by the prop. =
 So is it a fuel servo problem where it is not regulating flow correctly at t=
he very low end with the front door almost shut.  I would have expected rich=
 rather than the other way round but 4 high EGTs can't be wrong.  My servo i=
s the standard Precision Airmotive RSA 5ad1 serviced 30hours ago by an autho=
rized shop. =20

Sooo.. Anybody have a similar experience with their engine or thought on wha=
t might have caused the anomaly?

I am pulling the flight data out of the mfd tonight to see if there is anyth=
ing obvious there

Thanks=20

Tom=