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Topic Options
#45297 - 08/16/11 08:22 AM Stall horn adjustment
bnoles1000 Offline
New Member

Registered: 08/16/11
Posts: 2
Loc: St. Louis, MO
When I test my stall warning horn on the ground for my 172M it works, but will not sound when I stall the plane. Does anyone know which way to adjust it at the wing (up or down) to make the warning sound at a higher airspeed. I have only heard it once when landing with a high cross wind. Thanks for any help!

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#45371 - 08/16/11 07:03 PM Re: Stall horn adjustment [Re: bnoles1000]
Pilot110 Offline
Silver Pilot

Registered: 03/15/11
Posts: 979
Loc: Florida,USA
Originally Posted By: bnoles1000
When I test my stall warning horn on the ground for my 172M it works, but will not sound when I stall the plane. Does anyone know which way to adjust it at the wing (up or down) to make the warning sound at a higher airspeed. I have only heard it once when landing with a high cross wind. Thanks for any help!


I think the stall horn is designed to go off about 5mph above actual stall break. I know during training we used to slow fly Cessnas with the stall horn blaring continuously the entire time.

Does your stall horn go off when you do straight ahead stalls in flight. It may not be loud enough for you to hear it with a headset on.

Stve


Edited by Pilot110 (08/16/11 07:04 PM)

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#45374 - 08/16/11 07:31 PM Re: Stall horn adjustment [Re: Pilot110]
Russ Farris Offline
Second in Command

Registered: 08/15/10
Posts: 148
Loc: Charlotte, NC
Does the 172M have the stall warning vane or the reed?

Russ Farris

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#45405 - 08/17/11 07:20 AM Re: Stall horn adjustment [Re: Russ Farris]
bnoles1000 Offline
New Member

Registered: 08/16/11
Posts: 2
Loc: St. Louis, MO
The stall warning does not go off during any stall or slow flight. It's not a big deal but it would be nice to have working. I have tried without my headset on thinking that maybe I just couldn't hear it - that's not it. I hate to say it but I don't know if it's a vane or reed style. It doesn't have the tab that sticks out. It has the open hole slot. I did loosen up the four screws on the wing and adjusted the slot up about 1/4 of a inch. I did fly it after that but had the wife and kids on board and they weren't up for testing it during a stall. High winds that day caused a higher air speed then normal so it didn't get tested with landing either. Thanks for any input!

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#45417 - 08/17/11 09:15 AM Re: Stall horn adjustment [Re: bnoles1000]
EdW Offline
Club Sponsor
Gold Pilot

Registered: 11/21/10
Posts: 1259
Loc: Just east of Graceland
Your reeds are probably worn, which is the reason there was an AD for the horn-type stall warning systems. It is better left to your mechanic for replacement/adjustment.

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#45460 - 08/17/11 03:36 PM Re: Stall horn adjustment [Re: EdW]
Beeza Offline
Club Sponsor
Pilot in Command

Registered: 01/20/11
Posts: 370
Loc: Cabarete, Dominican Republic
Check if the squeaker works or you may have a blockage in the pipe.

You'll need something to stand on, unless you are incredibly tall. Put your mouth over the stall orifice and suck.

If you don't hear the squeak, replace the squeaker or check for a blocked tube. If you do hear the squeak you will need to adjust the orifice in accordance with the maintenance manual.

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#45468 - 08/17/11 05:08 PM Re: Stall horn adjustment [Re: Beeza]
California Flyer Offline
Platinum Pilot

Registered: 10/21/09
Posts: 4944
Loc: Groveland, California
Originally Posted By: Beeza
Check if the squeaker works or you may have a blockage in the pipe.

You'll need something to stand on, unless you are incredibly tall. Put your mouth over the stall orifice and suck.

You don't need to be tall... one of the guys at my flight school figured out that a ten cent piece of aquarium tubing (clear plastic tubing about a quarter inch in diameter) shoved into the entrance of the stall horn does just fine. Shove the tubing in, cover the rest of the opening with your finger, and suck on the other end of the tube. It should squeak if it's working properly.
_________________________
Co-Conspirator, Cessna 172 Club and Forum
http://www.cessna172club.com


Owner of N291ME, a 2000 Cessna 172SP

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#45496 - 08/17/11 09:36 PM Re: Stall horn adjustment [Re: California Flyer]
wrecksum Offline
SVP Public Relations
Platinum Pilot

Registered: 09/26/10
Posts: 2704
Loc: Dominican Republic
And hope there's not a bug stuck in there........
_________________________
A person without a sense of humour is like a wagon without springs.It's jolted by every pebble in the road.

Cessna 172, C172, C-172, Cessna Skyhawk fan.
www.cessna172club.com

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#45684 - 08/19/11 08:06 AM Re: Stall horn adjustment [Re: wrecksum]
Pilot110 Offline
Silver Pilot

Registered: 03/15/11
Posts: 979
Loc: Florida,USA

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#46687 - 08/29/11 01:24 AM Re: Stall horn adjustment [Re: Pilot110]
windsock Offline
Club Sponsor
Bronze Pilot

Registered: 01/24/11
Posts: 744
Loc: Alabama, USA
LOL....or a wasps nest ?
_________________________
SOMEWHERE, A MAN ON HIS MOTORCYCLE IS PRETENDING TO FLY !

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#46688 - 08/29/11 01:28 AM Re: Stall horn adjustment [Re: windsock]
windsock Offline
Club Sponsor
Bronze Pilot

Registered: 01/24/11
Posts: 744
Loc: Alabama, USA
This is what I use.. I'm not much of a sucker ?
http://sportys.com/PilotShop/product/12675
_________________________
SOMEWHERE, A MAN ON HIS MOTORCYCLE IS PRETENDING TO FLY !

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#46690 - 08/29/11 02:06 AM Re: Stall horn adjustment [Re: windsock]
California Flyer Offline
Platinum Pilot

Registered: 10/21/09
Posts: 4944
Loc: Groveland, California
The good news is that only tiny bugs would fit through the aquarium tubing... if it's that small, it's just protein smile
_________________________
Co-Conspirator, Cessna 172 Club and Forum
http://www.cessna172club.com


Owner of N291ME, a 2000 Cessna 172SP

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#114991 - 02/15/13 07:11 PM Re: Stall horn adjustment [Re: bnoles1000]
Fester Chicken Offline
New Member

Registered: 02/15/13
Posts: 5
Loc: MO
Hi. I know this is a dead thread, but I recently had the exact same problem with the stall horn on my 172M. I purchased and replaced the horn/reed assembly, and it would test on the ground but still not work in flight. Further investigation revealed a crack in the plastic piece that the hose connects to at the wing leading edge. Part replaced, problem solved.

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#114995 - 02/15/13 07:43 PM Re: Stall horn adjustment [Re: Fester Chicken]
TexasAviator Offline
Bronze Pilot

Registered: 01/03/11
Posts: 531
Loc: Seguin, Tx
I have a 172M and I haven't been hearing my stall warning either. Guess I'll test it with the sucking method and see what it does. And I'll place a cloth over it to keep the bugs out of my mouth.

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#115001 - 02/15/13 09:16 PM Re: Stall horn adjustment [Re: TexasAviator]
Fester Chicken Offline
New Member

Registered: 02/15/13
Posts: 5
Loc: MO
It will probably sound ok with direct suction, like mine did, but a crack in the part inside the leading edge will keep it from working at lower suction levels in flight. Remove the tie down loop and then loosen the strut fairing to slide it out of the way. That will allow the inspection plate to be removed, then a flashlight will probably reveal a cracked part called the Scoop assembly, part #0413028-10.


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#115023 - 02/16/13 06:24 AM Re: Stall horn adjustment [Re: bnoles1000]
vettdvr Offline
Club Sponsor
Diamond Pilot

Registered: 06/24/10
Posts: 6668
Loc: Slidell La
Originally Posted By: bnoles1000
When I test my stall warning horn on the ground for my 172M it works, but will not sound when I stall the plane. Does anyone know which way to adjust it at the wing (up or down) to make the warning sound at a higher airspeed. I have only heard it once when landing with a high cross wind. Thanks for any help!


Ok,,

My 172M works in flight and speeds appear correct when it comes on. But it WON'T work on the ground no way no how. Every landing it is going off just before touchdown so I know it works as it should in the air. So why won't it work on the ground?
_________________________
Vettdvr

Single/Multi/instrument/type/commercial But then I am still learning.

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#115057 - 02/16/13 01:34 PM Re: Stall horn adjustment [Re: vettdvr]
agghopp Offline
Pilot in Command

Registered: 02/17/10
Posts: 348
Loc: Buckeye State
Ok,,

My 172M works in flight and speeds appear correct when it comes on. But it WON'T work on the ground no way no how. Every landing it is going off just before touchdown so I know it works as it should in the air. So why won't it work on the ground? [/quote]

Squat switch?? grin
_________________________
'66-G model, O-300 145 HP Conti, "Smooth Sixie"

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#115067 - 02/16/13 03:49 PM Re: Stall horn adjustment [Re: agghopp]
cadcap Offline
Silver Pilot

Registered: 11/17/11
Posts: 827
Loc: NW Indiana
In flight the suction is so slight that if you over do it on the ground it WONT work. (Suck Gently! Not kidding..try it) The adjustment on the reed type stall horn is up for higher or down for lower airspeed adjustment.

I believe the original factory manual states 1/8" movement changes the activation speed by ten MPH in the normal landing config.. I'll check my factory manual tommorrow at the hangar and repost after checkin for sure.

AND did you all know there is an AD for the installation of a bug screen over the port so hitchhikers can't get in there???
_________________________
1966 172H "Bronze Lindy" OshKosh '13

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#115070 - 02/16/13 04:48 PM Re: Stall horn adjustment [Re: cadcap]
vettdvr Offline
Club Sponsor
Diamond Pilot

Registered: 06/24/10
Posts: 6668
Loc: Slidell La
Squat switch,, Must have number to authorize installation of new part. However Saq Squat part can be added with only log entry. Bugs in my stall horn,, never, they only plug my fuel tank vent never the stall, but then they are dirt dobbers packing mud.
_________________________
Vettdvr

Single/Multi/instrument/type/commercial But then I am still learning.

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#115306 - 02/17/13 11:36 PM Re: Stall horn adjustment [Re: vettdvr]
cadcap Offline
Silver Pilot

Registered: 11/17/11
Posts: 827
Loc: NW Indiana
Checked my 1968 issue factory manual it says to raise (or lower) the stall warning opening scoop 3/32" for each 5 mph of airspeed increase (or decrease).
_________________________
1966 172H "Bronze Lindy" OshKosh '13

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