What's new
Van's Air Force

Don't miss anything! Register now for full access to the definitive RV support community.

washer problem - help needed

R

Reilly

Active Member
Not sure if I am missing something here. I am busy with the stall warning device. The plans call for the use of AN960-4 and 4L washers.

I have a bag that should contain 16 AN960-4's and 12 AN960-4L's.

Instead it contains 28 of the same size. When I look at the charts, the 4's should be 0,032 thick and the 4L's should be 0,016 thick.

These all measure 0,023 thick. I cannot even find something like this on the charts.

Anyone have any clues?

Also calls for the use of AN960-8 which should be 0,032 thick and they also 0,023 thick.

Really confused here.

pg 16-02
 
I struggled with the same thing as they all looked the same size to me. I assume you measured them? I didn't and tried to eyeball them and sort by size. In the end I had my wife do it and she had the whole thing assembled in less and 5 minutes. We just finished riveting up the left wing yesterday and lo and behold the stall warning sensor appears to move perfectly free and clear.
 
Stall warning vane

Use any combination of washers to center the vane left to right in the wing skin slot. The vane should not bind and the switch should click on and off per the plans.
Joe Gores
 
Stall Warning Device Washer Problem

Reilly,

Marty Santic had your same problem. In quotes below is what Marty said on 10-03-2008 in http://www.vansairforce.com/community/showthread.php?t=34767.

"Page 16-02 Step 4: Ensure Hardware bag 2618 contains 16 AN-960-4 and 12 AN-960-4L washers. Looking at the 28 washers supplied to me they appear alike. All are 0.0225" to 0.024" thick. These are the small washers used to assemble the stall warning microswitch.

Specifications from Internet:
AN960-4 - #4 .125 x .312 x .032"
AN960-4L - #4 .125 x .312 x .016"

Elected to place 7 AN960-4 washers (I measured the one's sent to me at 0.023") between the outboard face of VA-195A and the micro-switch. This gave me a build-up of 0.161" compared to a buildup of 0.160" if the AN960-4 washers were per the MIL spec. I placed 3 of of the 0.023" AN960-4 washers between the micro-switch and the VA-195B keeper plate. With this arrangement the stall warning vane did not bind. After I installed the wing skin to check alignment, the vane was centered in the slot in the wing skin. (All of this was approved by Van's via a phone conversation.)"

Vans has changed these washers in the newer kits. I have kit 120457 and just finished installing my stall warning device. My bag 2618-1 contained the following washers:

20 NAS1149FN432P (repalces AN960-4)
12 NAS1149FN416P (replaces AN960-4L)
8 NAS1149FN832P (replaces AN960-8)
12 NAS1149F0363P (replaces AN960-10)
12 NAS1149F0332P (replaces AN960-10L)

My stall warner required six NAS1149FN432P (.032") washers in two locations between the VA-195A Mount Plate and the ES E22-50K Microswitch. It required four NAS1149FN416P (.016") washers in two locations between the microswitch and the VA-195B Keeper Plate. It also required two NAS1149FN832P (.032") washers between the VA-195A Mount Plate and the VA-196 Vane and one NAS1149FN washer between the Vane and the VA-195B Keeper Plate. I used one NAS1149FN416P (.016") washer under each of the MS21044N04 nuts and one NAS1149FN832P (.032") washer under the AN365-832 nut.

With these spacings, my stall warner was installed and checked out with the center left wing skin with no interferences.

Fred Carnes
 
Thanks

Thanks Fred.

I did think about doing that but eventually just went a bought a bag of washers that are the correct thickness.

Have not got to fitting them yet.
 
Thanks for the thread. ;)

I spent over 1 hour measuring the washers, wife tried to help..out came the magnifying glass etc and we still couldn't tell them apart. Why the freak would you say that the bag contains 16 A960-4 washers and 12 AN960-4L washers when it doesn't ?
 
You must log in or register to reply here.
Back
Top