X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 03 Dec 2007 00:17:48 -0500 Message-ID: X-Original-Return-Path: Received: from web54404.mail.yahoo.com ([206.190.49.134] verified) by logan.com (CommuniGate Pro SMTP 5.2c1) with SMTP id 2552163 for lml@lancaironline.net; Sun, 02 Dec 2007 12:40:51 -0500 Received-SPF: none receiver=logan.com; client-ip=206.190.49.134; envelope-from=randylsnarr@yahoo.com Received: (qmail 36407 invoked by uid 60001); 2 Dec 2007 17:40:10 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=X-YMail-OSG:Received:Date:From:Subject:To:In-Reply-To:MIME-Version:Content-Type:Content-Transfer-Encoding:Message-ID; b=r7Kga4ifr+/K5N3NiggjEFgatgtftOMr/NZvbyvxTnmvqMh7FLpbMhkeUqA+JTIJeh7aGqzZvOfSl/SmxQzI/In96setHVfMQReYASD823WUH/qpU00iJEJ0VLYHOYbziUBKE1VY5ioVvDwmJgwjXwdh9SiZACiyGnLHIkA5hIE=; X-YMail-OSG: PvMz9SwVM1lwQ6zNsj1i0rhILHdAmsbiGcHyeYlisrnicWQk3yZABwUbIhpaG3WjJzHyU4sbrbeYkGFOC1p9bdK3VlbM0tCNz3MotJbBOxpiozB6LGQ- Received: from [76.8.220.18] by web54404.mail.yahoo.com via HTTP; Sun, 02 Dec 2007 09:40:09 PST X-Original-Date: Sun, 2 Dec 2007 09:40:09 -0800 (PST) From: randy snarr Subject: Re: [LML] gear dump valve-LNC2 X-Original-To: Lancair Mailing List In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="0-1565447656-1196617209=:33561" Content-Transfer-Encoding: 8bit X-Original-Message-ID: <51801.33561.qm@web54404.mail.yahoo.com> --0-1565447656-1196617209=:33561 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit Gerard, I am glad all turned out ok. I would probably replace both the dump valve and the instructor... Sorry for the crack about your instructor. I have never been a big fan of instructors creating emergencies in the pattern especially in your situation with a new repair in a hot plane. I knew of instructor once that pulled power on one engine to a guy in a light twin on take off during multi engine training. The student promptly feathered the wrong prop. They both nearly met their maker that day. Have him give you emergencyies with time and altitude to spare. It is a common perception that the dump valve relieves pressure. It does not. It only connects the high and low pressure sides allowing the fluid to move allowing the gear to come down still under pressure just equal on both sides. Either the dump valve is non functioning or there is some other issue that would not allow the fluid to move. I would get it on the jacks and investigate before you fly again especially where the airplane has had some damage. Many including myself have encouraged installation of hyd pressure gages in the airplane. Mine are in the panel but if you do not have room I would install them somewhere even if they could only be seen during maintenance. They are extremely helpful in troubleshooting issues not to mention a great help in understanding how your hyd system works. FWIW.. Randy L. Snarr 235/320 gerardoconnell@optusnet.com.au wrote: The wings were recently removed for repairs on the fuselage on my 320. I assumed retract and free fal tests were performed by the LAME but this may be a false assumption. The first flight since repair was a check ride for pilot currency during which the instructor sneakily pulled the circuit breaker whilst we were on base leg and prior to my selecting gear down to see if I would notice. I noticed immediately that the motor did not run and reached for the dump handle to allow free fall but nothing happened. I then noticed the pulled breaker and reset it and the gear went down normally. I have not yet put the aircraft on jacks to check the free fall. Any thoughts on why pulling the handle would fail to relieve pressure? I thought the handle worked on placing horizontal regardless of whether it is placed fore or aft, but perhaps it is directional? As we were on final I did not continue to trouble shoot the problem whilst in the air. Your thoughts before I fly again....? Gerard -- For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.html --------------------------------- Get easy, one-click access to your favorites. Make Yahoo! your homepage. --0-1565447656-1196617209=:33561 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: 8bit Gerard,
I am glad all turned out ok.
I would probably replace both the dump valve and the instructor...

Sorry for the crack about your instructor. I have never been a big fan of instructors creating emergencies in the pattern especially in your situation with a new  repair in a hot plane. I knew of instructor once that pulled power on one engine to a guy in a light twin on take off during multi engine training. The student promptly feathered the wrong prop. They both nearly met their maker that day. Have him give you emergencyies with time and altitude to spare.

It is a common perception that the dump valve relieves pressure. It does not. It only connects the high and low pressure sides allowing the fluid to move allowing the gear to come down still under pressure just equal on both sides. Either the dump valve is non functioning or there is some other issue that would not allow the fluid to move. I would get it on the jacks and investigate before you fly again especially where the airplane has had some damage.
Many including myself have encouraged installation of hyd pressure gages in the airplane. Mine are in the panel but if you do not have room I would install them somewhere even if they could only be seen during maintenance. They are extremely helpful in troubleshooting issues not to mention a great help in understanding how your hyd system works.

FWIW..

Randy L. Snarr
235/320



gerardoconnell@optusnet.com.au wrote:
The wings were recently removed for repairs on the fuselage on my 320. I assumed retract and free fal tests were performed by the LAME but this may be a false assumption.

The first flight since repair was a check ride for pilot currency during which the instructor sneakily pulled the circuit breaker whilst we were on base leg and prior to my selecting gear down to see if I would notice.

I noticed immediately that the motor did not run and reached for the dump handle to allow free fall but nothing happened. I then noticed the pulled breaker and reset it and the gear went down normally.

I have not yet put the aircraft on jacks to check the free fall. Any thoughts on why pulling the handle would fail to relieve pressure? I thought the handle worked on placing horizontal regardless of whether it is placed fore or aft, but perhaps it is directional? As we were on final I did not continue to trouble shoot the problem whilst in the air.

Your thoughts before I fly again....?

Gerard


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