X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 12 Jun 2013 09:35:56 -0400 Message-ID: X-Original-Return-Path: Received: from qmta04.westchester.pa.mail.comcast.net ([76.96.62.40] verified) by logan.com (CommuniGate Pro SMTP 6.0.5) with ESMTP id 6320779 for lml@lancaironline.net; Wed, 12 Jun 2013 08:56:50 -0400 Received-SPF: pass receiver=logan.com; client-ip=76.96.62.40; envelope-from=jmorgan1023@comcast.net Received: from omta17.westchester.pa.mail.comcast.net ([76.96.62.89]) by qmta04.westchester.pa.mail.comcast.net with comcast id nPbt1l0011vXlb854QwFiH; Wed, 12 Jun 2013 12:56:15 +0000 Received: from [192.168.1.115] ([24.11.157.196]) by omta17.westchester.pa.mail.comcast.net with comcast id nQwF1l0074EXR5U3dQwFEw; Wed, 12 Jun 2013 12:56:15 +0000 From: Jack Morgan Mime-Version: 1.0 (Apple Message framework v1283) Content-Type: multipart/alternative; boundary="Apple-Mail=_1D4BAB66-1E80-4A4F-A4D0-E2E7FAF029CA" Subject: nose gear check X-Original-Date: Wed, 12 Jun 2013 08:56:17 -0400 In-Reply-To: X-Original-To: Lancair Mailing List References: X-Original-Message-Id: <8B10677E-F3B8-47D6-B22A-26E3FC2B5464@comcast.net> X-Mailer: Apple Mail (2.1283) --Apple-Mail=_1D4BAB66-1E80-4A4F-A4D0-E2E7FAF029CA Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=iso-8859-1 Hi Ralf, I have often done this and see no problem. I hang a "box of rocks" = (Lancair part number 120099008-00-a.... just kidding) from the tail = tie down. Just add large rocks until the airplane sits back on the box = (over 100 lbs of rocks). I then have a friend blow gently into the pitot = to release the gear lever and move it part way. Turn the master off or = pull the pump breaker and move the gear lever to full down if you have = the standard hydraulic reservoir. There is not enough capacity with the = standard reservoir to put significant pressure on the main cylinders. = You can cycle the nose gear up and down without moving the gear lever = all the way up to lock it. I suggest using the master to control the = hydraulic pump since repeated cycling of the pump breaker will = eventually fail it. If you have the large reservoir, discharge it by moving the gear lever = partially up and down until it is depleted and then use the pump as = above. With the weight of the rocks and the airplane there is considerable = weight on the mains. I believe this set up is preferable to lifting the = nose as it gives extra insurance that the mains can't move. I have never = let the full hydraulic pressure come up so don't know if the mains can = actually lift the airplane and collapse. Perhaps others have experience = here and can comment. It is easy to partially retract the nose by = cycling the master and therefore the pump. You can then manually move = the nose gear up to check the door clearance and closure. Release one = door so you can see what is going on with the other door when moving the = wheel up into the tunnel. Hope this helps. Jack Morgan On Jun 12, 2013, at 6:00 AM, Lancair Mailing List wrote: > From: > Subject: Nose gear check 4P > Date: June 11, 2013 10:30:07 AM EDT > To: lml@lancaironline.net >=20 >=20 > Dear subscribers, >=20 > A friend took a picture of the belly of my airplane in flight with the > gear up. It looked to me that the nose gear door was not completely > closed. I had that issue before on the ground before and adjusting the > threaded rods fixed it. >=20 > I am reluctant of putting the airplane on jacks and do a complete gear > check because my jack up equipment is not perfect and it is a major > undertaking to get the airplane that high. >=20 > Someone told me (unfortunately I don't remember who) that I can leave > the plane on the main gear and just use a hoist with ropes around the > prop and lift the nose gear of the ground and then move the gear = switch > up (after unlocking it). >=20 > The hydraulic pressure is not high enough to move the mains but it = will > move the nose gear. Is this an ok procedure to use? Do I need to = remove > the spinner if I wrap a rope around the 2 blades of my 3 blade prop? >=20 > Thanks for your input >=20 > Ralf --Apple-Mail=_1D4BAB66-1E80-4A4F-A4D0-E2E7FAF029CA Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=iso-8859-1 Hi = Ralf,

I have often done this and see no problem. I hang a = "box of rocks" (Lancair part number 120099008-00-a....   just = kidding) from the tail tie down. Just add large rocks until the airplane = sits back on the box (over 100 lbs of rocks). I then have a friend blow = gently into the pitot to release the gear lever and move it part way. = Turn the master off or pull the pump breaker and move the gear lever to = full down if you have the standard hydraulic reservoir. There is not = enough capacity with the standard reservoir to put significant pressure = on the main cylinders. You can cycle the nose gear up and down without = moving the gear lever all the way up to lock it. I suggest using the = master to control the hydraulic pump since repeated cycling of the pump = breaker will eventually fail it.

If you have the = large reservoir, discharge it by moving the gear lever partially up and = down until it is depleted and then use the pump as = above.

With the weight of the rocks and the = airplane there is considerable weight on the mains. I believe this set = up is preferable to lifting the nose as it gives extra insurance that = the mains can't move. I have never let the full hydraulic pressure come = up so don't know if the mains can actually lift the airplane and = collapse. Perhaps others have experience here and can comment. It is = easy to partially retract the nose by cycling the master and therefore = the pump. You can then manually move the nose gear up to check the door = clearance and closure. Release one door so you can see what is going on = with the other door when moving the wheel up into the = tunnel.

Hope this = helps.

Jack = Morgan


On Jun 12, 2013, at 6:00 = AM, Lancair Mailing List wrote: