Backcountry Pilot • Adjusting flaps Cessna

Adjusting flaps Cessna

Have problems with your aircraft? Maybe just questions about how best to tune or adjust something? Regs or maintenance? Need to know the best way to do something?
9 postsPage 1 of 1

Adjusting flaps Cessna

My 69 206 had a max deflection of about 30° on the flaps, it is R STOL and at one time was on floats, because it is placarded as no more than 30° of flaps on floats I think perhaps someone just went and adjusted them so they could not go to 40 degrees.

I had a mechanic try and adjust them to 40°, you could only get them to 37° and then we realized they would not retract all the way. The plastic cam on the flap switch is a little worn and the thought was that replacing it might help the flaps go to 40°.… But as I was looking at it and playing around, both of the micro switches on each end of the cam engage and disengage fine I’m wondering it other adjustments might work; I noticed that none of the limit switches engage in the wing (when I manually depress the “up” Micro switch on the flap switch it moves the flaps to about 37 degrees).

My question is, would it be OK to always have the limit switches in the wing engage, that way they would be the limiter of travel and not the micro switches on the flap switch. If this is kosher, I think I could adjust the follow up cable and micro switches to give me more deflection while still not triggering the opposite microswitch on the flap switch. … if this worked the only thing that would be off is the pointer for the flat position by the switch?- but I think this is adjustable?
AZ Flyer offline
Supporter
User avatar
Posts: 103
Joined: Sun Aug 29, 2010 6:01 pm
Location: Flagstaff
Aircraft: Cessna 206

Re: Adjusting flaps Cessna

AZ,

You need to find a wrench with 206 experience.

The two micro switches in the wing are your up stop limit, the outboard one, and your down stop limit, the inboard one.
The flap paddle is what moves the flap in between the two switches in the wing.

If nether wing switch is making contact things are not as they should be.
Something expensive could get damaged or worse a safety of flight issue could ensue.

Gotta start with the MM for one. Sounds like things might be fairly buggered up and it's going to require going to step one and working through the system IAW the MM.

That's all I can say without digging out my manuals.

Most of my 206 were U206 E and F models if I recall so your earlier model may use a different system?

Sorry I couldn't offer up more but WTH it's free internet advise ;)

Rocket
rocket offline
User avatar
Posts: 156
Joined: Tue May 15, 2012 3:08 pm
Location: Talkeetna
FindMeSpot URL: http://share.findmespot.com/shared/face ... 9GZmP4hOO2

Re: Adjusting flaps Cessna

A little off topic but I recently saw a 172 where an inboard track jammed due to a badly worn roller (the track was still within limits but roller had a flat on it). The electric drive twisted the entire flap before it blew the breaker. Landed fine. Flap destroyed.
daedaluscan offline
Supporter
User avatar
Posts: 1269
Joined: Sat Jan 12, 2013 1:06 pm
Location: Texada BC

Re: Adjusting flaps Cessna

I would reiterate that you need to take this up with a mechanic who’s knowledgeable on Cessna flap mechanisms.

Back when I started flying a 206 on floats, the mechanics were busily trying to figure out how to limit flap travel per the float STC. I asked a dumb pilot question:

Rather than re-adjusting the flap travel twice a year (I definitely wanted forty flaps on wheels), why not just install a small metal bar on the flap selector which limits flap selection.

Chief of Maintenance thought about that for a second, then said, “Make it so!”.

The good news was that every year after that the mechanics who installed those floats seemed to always forget to re-install that little bar, which lived in the ash tray ever after.

Adjusting flaps on these things can be a PITA.

MTV

MTV
mtv offline
Knowledge Base Author
User avatar
Posts: 10514
Joined: Sat Feb 25, 2006 1:47 am
Location: Bozeman

Re: Adjusting flaps Cessna

mtv wrote:I would reiterate that you need to take this up with a mechanic who’s knowledgeable on Cessna flap mechanisms.

Back when I started flying a 206 on floats, the mechanics were busily trying to figure out how to limit flap travel per the float STC. I asked a dumb pilot question:

Rather than re-adjusting the flap travel twice a year (I definitely wanted forty flaps on wheels), why not just install a small metal bar on the flap selector which limits flap selection.

Chief of Maintenance thought about that for a second, then said, “Make it so!”.

The good news was that every year after that the mechanics who installed those floats seemed to always forget to re-install that little bar, which lived in the ash tray ever after.

Adjusting flaps on these things can be a PITA.

MTV

MTV


HA, I was just the opposite, I would leave the little metal bar right there when I switched them to wheels cause we often went to winter maint at PANC from PAKN
rocket offline
User avatar
Posts: 156
Joined: Tue May 15, 2012 3:08 pm
Location: Talkeetna
FindMeSpot URL: http://share.findmespot.com/shared/face ... 9GZmP4hOO2

Re: Adjusting flaps Cessna

Good advice everyone, I’m going to try to order a new cam and have the switch readjusted.
AZ Flyer offline
Supporter
User avatar
Posts: 103
Joined: Sun Aug 29, 2010 6:01 pm
Location: Flagstaff
Aircraft: Cessna 206

Re: Adjusting flaps Cessna

mtv wrote:Adjusting flaps on these things can be a PITA.

MTV

MTV



THIS is the understatement of the year!!!

Don't mess with it until you get the manual and are ready to spend some time.
John
hardtailjohn offline
User avatar
Posts: 924
Joined: Thu Mar 16, 2006 7:06 pm
Location: Marion, Montana
God put me here to accomplish a certain amount of things...right now I'm so far behind, I'll never die!!

Re: Adjusting flaps Cessna

daedaluscan wrote:A little off topic but I recently saw a 172 where an inboard track jammed due to a badly worn roller (the track was still within limits but roller had a flat on it). The electric drive twisted the entire flap before it blew the breaker. Landed fine. Flap destroyed.
Huh, I recently sold a flap to a company that had that happen to one of their training aircraft...
A1Skinner offline
Supporter
User avatar
Posts: 5186
Joined: Sat Jan 21, 2012 11:38 am
Location: Eaglesham
FindMeSpot URL: [url:1vzmrq4a]http://share.findmespot.com/shared/faces/viewspots.jsp?glId=0az97SSJm2Ky58iEMJLqgaAQvVxMnGp6G[/url:1vzmrq4a]
Aircraft: Cessna P206A, AT402/502/602

Re: Adjusting flaps Cessna

hardtailjohn wrote:
mtv wrote:Adjusting flaps on these things can be a PITA.

MTV

MTV



THIS is the understatement of the year!!!

Don't mess with it until you get the manual and are ready to spend some time.
John
X2.
A1Skinner offline
Supporter
User avatar
Posts: 5186
Joined: Sat Jan 21, 2012 11:38 am
Location: Eaglesham
FindMeSpot URL: [url:1vzmrq4a]http://share.findmespot.com/shared/faces/viewspots.jsp?glId=0az97SSJm2Ky58iEMJLqgaAQvVxMnGp6G[/url:1vzmrq4a]
Aircraft: Cessna P206A, AT402/502/602

DISPLAY OPTIONS

9 postsPage 1 of 1

Who is online

Users browsing this forum: No registered users and 1 guest

Latest Features

Latest Knowledge Base