X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 08 Apr 2010 21:13:30 -0400 Message-ID: X-Original-Return-Path: Received: from betsy.gendns5.com ([65.254.38.234] verified) by logan.com (CommuniGate Pro SMTP 5.3.5) with ESMTPS id 4213520 for lml@lancaironline.net; Wed, 07 Apr 2010 17:20:28 -0400 Received-SPF: none receiver=logan.com; client-ip=65.254.38.234; envelope-from=paul@tbm700.com Received: from 6.21.204.68.cfl.res.rr.com ([68.204.21.6]:64928 helo=[192.168.1.101]) by betsy.gendns5.com with esmtpsa (TLSv1:AES128-SHA:128) (Exim 4.69) (envelope-from ) id 1Nzcf8-0000l7-6v for lml@lancaironline.net; Wed, 07 Apr 2010 17:19:50 -0400 From: paul miller Mime-Version: 1.0 (Apple Message framework v1077) Content-Type: multipart/alternative; boundary=Apple-Mail-10-310213532 Subject: Re: [LML] Re: gear retract problems - 320 X-Original-Date: Wed, 7 Apr 2010 17:19:49 -0400 In-Reply-To: X-Original-To: "Lancair Mailing List" References: X-Original-Message-Id: <88BAEDEB-4EC6-4114-A435-BFEC3E3F461E@tbm700.com> X-Mailer: Apple Mail (2.1077) X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - betsy.gendns5.com X-AntiAbuse: Original Domain - lancaironline.net X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - tbm700.com --Apple-Mail-10-310213532 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii So Bill, in the past, there have been a number of issues in the pump = that could cause your symptoms. 1) no spring in the shuttle, 2) = internal design defect.... By chance, did you look inside the old pump and find the difference? Paul Legacy RG (with the lockup on every major change in temperature) On 2010-04-07, at 9:40 AM, William Rumburg wrote: > John- > =20 > I answered this question on the LML about five years ago and, of = course, few (if any) 320/360 pilots listened to the solution. > So, I will offer it one more time... > I first encountered the 'failure to retract' problem in April 2000, = three years after first flight in my 320. I also quickly discovered that = releasing pressure by opening a high pressure fitting would enable gear = retraction, but ONLY that one time; the problem quickly reoccured. After = several years of attempting to alleviate the problem by opening the = free-fall valve after flight, kicking the tires, etc, etc, etc, it made = NO DIFFERENCE - Summer or Winter, night or day, hot or cold, the high = pressure build-up and 'failure to retract' reoccured. I even went to the = aggravitation of removing and returning the pump to Oildyne three times; = the first two, they 'bench checked' it and said they could find no = problem. The third time, I told them not to 'bench check' it, just = REBUILD it! That corrected the problem for about TEN cycles. > In 2002, I concluded that the problem was a result of an internal = design defect in the 1990's-era hydraulic pump (Oildyne wasn't going to = admit it and then have 1,000+ pilots come at them at say 'OK, now give = me a new pump') > I made the (correct) assumption that Oildyne had since recognized and = corrected the problem. I 'bit the bullet' (kissed Oildyne's A$$) and = ordered a new pump from Lancair for $900. (They're about $1,300. now). = I mounted the new pump on the side of the elevator pushrod tunnel behind = the pilot's seat (where it should have been in the first place, in spite = of the early 320 manual which had it behind the baggage bulkhead). > I was correct! The new pump has functioned flawlessly the past five = years. It is SWEET, retracts the gear in three to four seconds and = symmetrically each time. > =20 > Bill Rumburg > N403WR (Sonic Boom) > =20 > =20 > =20 > =20 > My 320 gear did not activate when I selected gear up yesterday - I = checked the circuit breaker, opened and closed the dump valve, selected = gear down, then up - all to no avail and then landed. > =20 > I recalled some discussion years ago about this issue and a temporary = fix being the "cracking" of the hydraulic pressure to get the system = going again - this I did and it worked ! > =20 > Can someone help me with identifying the actual cause and permanent = fix. > =20 > Thanks > =20 > John Spry > =20 > L320 --Apple-Mail-10-310213532 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=us-ascii So = Bill, in the past, there have been a number of issues in the pump that = could cause your symptoms.   1) no spring in the shuttle, 2) = internal design defect....

By chance, did you look = inside the old pump and find the = difference?

Paul
Legacy RG (with the = lockup on every major change in temperature)

On = 2010-04-07, at 9:40 AM, William Rumburg wrote:

John-
 
I answered = this question on the LML about five years ago and, of course, few (if = any) 320/360 pilots listened to the solution.
So, I will = offer it one more time...
I first encountered the 'failure to = retract' problem in April 2000, three years after first flight = in my 320. I also quickly discovered that releasing pressure by = opening a high pressure fitting would enable gear retraction, but ONLY = that one time; the problem quickly reoccured. After several years of = attempting to alleviate the problem by opening the free-fall valve = after flight, kicking the tires, etc, etc, etc,  it made NO = DIFFERENCE - Summer or Winter, night or day, hot or cold, the high = pressure build-up and 'failure to retract' reoccured. I even went to the = aggravitation of removing and returning the pump to Oildyne three times; = the first two, they 'bench checked' it and said they could find no = problem. The third time, I told them not to 'bench check' it, just = REBUILD it! That corrected the problem for about TEN = cycles.
In 2002, I concluded that the problem was a result of = an internal design defect in the 1990's-era hydraulic pump (Oildyne = wasn't going to admit it and then have 1,000+ pilots come at them at say = 'OK, now give me a new pump')
I made the (correct) assumption = that Oildyne had since recognized and corrected the problem. = I 'bit the bullet' (kissed Oildyne's A$$) and ordered a new pump = from Lancair for $900. (They're about $1,300. now).  I mounted = the new pump on the side of the elevator pushrod tunnel behind the = pilot's seat (where it should have been in the first place, in = spite of the early 320 manual which had it behind the baggage = bulkhead).
I was correct! The new pump = has functioned flawlessly the past five years. It = is SWEET, retracts the gear in three to four seconds and = symmetrically each time.
 
Bill = Rumburg
N403WR (Sonic = Boom)
 
 
 
 <= /div>
My 320 gear did not activate when I selected = gear up yesterday - I checked the circuit breaker, opened and closed the = dump valve, selected gear down, then up - all to no avail and then = landed.
 
I = recalled some discussion years ago about this issue and a temporary fix = being the "cracking" of the hydraulic pressure to get the system going = again - this I did and it worked !
 
Can= someone help me with identifying the actual cause and permanent = fix.
 
Thanks
 
John Spry
 
L320

= --Apple-Mail-10-310213532--