X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 23 May 2012 08:17:25 -0400 Message-ID: X-Original-Return-Path: Received: from b.mail.sonic.net ([64.142.19.5] verified) by logan.com (CommuniGate Pro SMTP 5.4.5) with ESMTPS id 5554263 for lml@lancaironline.net; Tue, 22 May 2012 17:56:47 -0400 Received-SPF: none receiver=logan.com; client-ip=64.142.19.5; envelope-from=superdmp@sonic.net Received: from Burner (rrcs-71-43-149-195.se.biz.rr.com [71.43.149.195]) by b.mail.sonic.net (8.13.8.Beta0-Sonic/8.13.7) with ESMTP id q4MLu9WU017732 for ; Tue, 22 May 2012 14:56:10 -0700 From: "David M. Powell CRFA" X-Original-To: "'Lancair Mailing List'" References: In-Reply-To: Subject: Runaway RPM & manifold pressure not coming up Lancair 360/Hartzel Prop X-Original-Date: Tue, 22 May 2012 17:55:50 -0400 X-Original-Message-ID: <2B7DD37D1C71446A8726BD6E9E2FA8C2@Burner> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00B8_01CD3844.20143820" X-Mailer: Microsoft Office Outlook 11 X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6002.18263 thread-index: Ac04UPaijoAMePniTGuTPmEQC+UtugAFJCYg This is a multi-part message in MIME format. ------=_NextPart_000_00B8_01CD3844.20143820 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Hi all, I've got a strange problem that I'm hoping someone has seen before. My mechanic normally works on certified aircraft, so he's contacted Lancair; but I think the answer lies here with the real experts. On a return from a cross country, I wasn't able to get my RPM and manifold pressure to 'square up' the way I wanted; but the trip did end without any major incidents(a little backfiring from the rookie pilot not slowing early enough) and I landed home safe. I asked the mechanic to check out the airplane. The mechanic noted that after starting the engine, the manifold pressure(vacuum) indicated down in the mid teens and stayed there. He wasn't able to increase it either by increasing RPM or by adjusting the prop governor (blue knob). We were able to cycle the prop and note a decrease in RPM, but the manifold pressure never came up (while the engine was running). The pressure read normal altimeter setting with the engine off. We had planned on a flight to see if the indications were different in the air, and figured it was just a read-out problem and not an airworthiness issue. On the takeoff roll, I noted that the RPM's exceeded red-line on my gauges; with less than full power (I roll in power gently). I aborted the take-off roll as it was apparent I had a runaway prop. To make this all a bit more interesting, I purchased this airplane and flew 5 hours cross country back home, did an additional 15 hours of flight training, and never once added a drop of oil. It has always been at exactly 7 qts. I noticed I'm now at 6 qts, and on pre-flight prior to my trip home from my cross-country, I noted 6.25 qts of oil. Oil pressure and temperature all were normal throughout. Any thoughts? I'm thinking the prop governor needs to be replaced. Thanx for all the great help, Dave P.S. Looking forward to meeting some of you in Arizona in September. David Powell CRFA superdmp@sonic.net (386) 868-5858 ------=_NextPart_000_00B8_01CD3844.20143820 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi all,

I've got a strange problem that I'm hoping = someone has=20 seen before. My mechanic normally works on certified aircraft, so = he's=20 contacted Lancair; but I think the answer lies here with the real=20 experts.

On a return from a cross country, I wasn't = able to get=20 my RPM and manifold pressure to 'square up' the way I wanted; but the = trip did=20 end without any major incidents(a little backfiring from the rookie = pilot not=20 slowing early enough) and I landed home safe. I asked the = mechanic to=20 check out the airplane. The mechanic noted that after starting the = engine,=20 the manifold pressure(vacuum) indicated down in the mid teens and stayed = there. He wasn't able to increase it either by increasing RPM or = by=20 adjusting the prop governor (blue knob). We were able to cycle the = prop=20 and note a decrease in RPM, but the manifold pressure never came up = (while the=20 engine was running). The pressure read normal altimeter setting = with the=20 engine off. We had planned on a flight to see if the indications = were=20 different in the air, and figured it was just a read-out problem and not = an=20 airworthiness issue. On the takeoff roll, I noted that the RPM's = exceeded=20 red-line on my gauges; with less than full power (I roll in power = gently). =20 I aborted the take-off roll as it was apparent I had a runaway=20 prop.

To make this all a bit more interesting, I = purchased=20 this airplane and flew 5 hours cross country back home, did an = additional 15=20 hours of flight training, and never once added a drop of oil. It = has=20 always been at exactly 7 qts. I noticed I'm now at 6 qts, and on=20 pre-flight prior to my trip home from my cross-country, I noted 6.25 qts = of=20 oil. Oil pressure and temperature all were normal=20 throughout.

Any thoughts? I'm thinking the prop = governor=20 needs to be replaced.

Thanx for all the great = help,

Dave

P.S.

Looking forward to meeting some = of you in=20 Arizona in September.

David Powell CRFA

superdmp@sonic.net

(386) = 868-5858

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