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1. 09:47 AM - Re: Re: unlocks not always locking... (cjpilot710@aol.com)
2. 10:43 AM - Re: Re: unlocks not always locking... (Walter Lannon)
Message 1
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| Subject: | Re: unlocks not always locking... |
While I can understand that the gear lights can come on during positive G
maneuvers, that has not happened to me - with these exceptions. Low system
pressure (at time I had sprung a leak somewhere) and the most Gs I've ever
had to pull is 5 gs. (I can get a sloppy loop from cruise with just 2.5
to 3 gs.) While my acro does not go to the extreme end of the envelope, (I
do my little routine never pulling more than 4 gs). I never see red lights
AS LONG as I have normal system pressure (50 atmos).
Jim (Pappy) Goolsby
In a message dated 3/15/2017 5:11:54 P.M. Eastern Daylight Time,
info@flyingwarbirds.com.au writes:
--> Yak-List message posted by: "JL2A" <info@flyingwarbirds.com.au>
I thought this might devolve into a handle position thread!
In the OP I did say that with the handle in UP that the aerobatic G forces
pull the gear out enough for the uplock microswitch to turn off.
i.e.. I fly with the handle in UP
Which is why it was interesting to find that when reverting to the gear
handle neutral when flying method that the uplocks were occasionally not
locking, even though microswitches were clicking.
Regarding the presence of uplocks, not being an engineering expert, I
figured they put the uplocks were there so there was less stress on the
actuator and retraction assembly while pulling up to 6 Gs? Seems to make sense
in a
mechanical-sympathy sort of way.
Thanks Jim, I will give them a good clean and see what happens.
PS we also checked the gear doors for contact etc. nothing has shifted
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=467358#467358
Message 2
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| Subject: | Re: unlocks not always locking... |
The actual reason for gear uplocks is to avoid the scenario of the P51 I
described earlier.
The original CJ manual does not specify a gear or flap limit but rather a
maximum circuit speed of 170 Kph (92 Kts).
In the CJ's earliest days in North America a group called Yakkity Yaks
determined that the gear down/flap down military limits for the NA T6 of
130/109 Kts. would sufffice for the CJ as well.
Any CJ owner who purchased my placard set knows that I thought those numbers
too high and always recommended 110/90 Kts. In later years the Civil
Aviation
Authority in the UK came up with a set of numbers which were almost
identical.
Walt
-----Original Message-----
From: JL2A
Sent: Wednesday, March 15, 2017 7:54 PM
Subject: Yak-List: Re: unlocks not always locking...
> If you keep pulling 6 Gs in a CJ, your wings are going to be in the UP
> position.
I was talking from a design point of view. The airframe was designed and
rated to 6Gs, so the gear system must be stress tested to handle this over
the design life too.
We have a 4G soft limit for all our aeros. Don't really see the need for
more.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=467372#467372
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