Undercarriage legs.

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ghostflyer
Posts: 1390
Joined: Mon Apr 21, 2008 3:06 am

Undercarriage legs.

Post by ghostflyer »

Ok just been reading the bits on carriage legs but where do we find the part number for our legs . No problem on finding the serial numbers but nothing else is visible . -plus I have measured the thickness and they are .8 in. The measuring was done with digitial vernier calpers.the legs are a constant thickness with a straight leading edge.
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GAHorn
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Re: Undercarriage legs.

Post by GAHorn »

Did your digital caliper happen to also be measuring paint-thickness?

Here's info I have in files somewhere...this is a "cut and paste":

The early 170 gear
PN 0541114 applicable thru SN 25611

is interchangeable R&L.
a hole is drilled through the center of the gear leg for the brake line clip, or dual dimples are used to secure either type of brake line clip.
both gear leading and trailing edges are symmetrical from the upper bend and tapering to the axle attach boss.
thickness is 5/8 but varies from .640 to .685
the gear comes straight out and down to the axle attach on a straight line, also referred to as wheels aft.
the weight is 29-30 lbs per leg.

The late 170B gear
PN 0541118-2 and 0541118-3 sn 25612 and on

-2 is right and -3 is left
a dimple is used to support the brake line clip
the gear has a straight leading edge facing forward
the thickness is 11/16 but varies from .665 to .685
the inside dimension from the center of the upper bend to the narrow end is approx 34-1/2"
the narrowest point of the gear measured just above the axle attach boss is 1-1/2"
the gear comes straight out and down to the axle attach on a straight line, also referred to as wheels aft.
the weight is 29-30 lbs per leg.

Early Cessna 180 gear ( used on 170's )
PN 0741001-1, 0741001-2, 0741001-3, and 0741001-4

-1 and -3 are left and -2 and -4 are right
a dimple is used to support the brake line clip
the gear has a straight leading edge facing forward
the thickness is 11/16 but varies from .665 to .685
the inside dimension from the center of the upper bend to the narrow end is approx 36"
the narrowest point of the gear measured just above the axle attach boss is 1-7/8"
on the -1 and -2 the gear comes straight out and down to the axle attach on a straight line, also referred to as wheels aft.
on the -3 and -4 the gear comes out angled forward and down to the axle approx 2-3" as compared to the -1 &-2, also referred to as wheels forward.
the weight is 32-33 lbs per leg.
All the gear have serial numbers. The 170 gear will have a letter followed by numbers like Z345 while the early 180 gear will have a letter number mix like 1Y345. Later years went to the 6 digit serial number like 801123 The serial numbers are on the end or the inside of the axle attach area.

Late Cessna 180/185 steel gear
PN 0741001-5, 0741001-6, 0741001-7, and 0741001-8 , or FAA PMA STC PP0741001-7 PP0741001-8. (This steel gear is currently manufactured by XP Modifications, Inc for PPonk Aviation.)

-5 and -7 are left and -6 and -8 are right
the gear has a straight leading edge facing forward
the thickness is .750 but varies from .745 to .760
the inside dimension from the center of the upper bend to the narrow end is approx 36"
the narrowest point of the gear measured just above the axle attach boss is 1-7/8"
on the -5, 6, -7 and -8 the gear comes out angled forward and down to the axle approx 2-3" as compared to the -1 &-2, also referred to as wheels forward.
the weight is 36-37 lbs per leg.

This info came to me from XP Modifications.
Hope it helps.
'53 B-model N146YS SN:25713
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention.
An originality nut (mostly) for the right reasons. ;)
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ghostflyer
Posts: 1390
Joined: Mon Apr 21, 2008 3:06 am

Re: Undercarriage legs.

Post by ghostflyer »

Thank you for the info but I did read that and my legs are .8 in thick with paint removed. The thickness is constant all the way down . Plus the paint is very thin .however I am after where the part no is stamped . I will get the serial numbers maybe that will help on part number identification. Each leg has a dimple for the clip for the brake line .there isn't any marks on the leg lower down however a "knowledgeable person "has stated the numbers could be on the axle side and that's why I cant see anything . We have many of these "knowledgeable persons " that just blow into the hangar and tell us the wisdom of the world and we are doing every thing wrong . Don't you love them !!! Now where's my gun?

Well back from the hangar, couldn't fly today with 50 to 60 mph winds . Not a cloud in the sky but right on the coast and we get the first big hit of the winds.
Left hand leg s/n 804564. Right hand leg s/n 800296
This the only markings I can find on both legs, please note .... it has "s/n " before each series of numbers , that why I am CONFUSED. I might paint strip the legs next week and do a repaint as there are a few stone chips .
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