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Flaps Malf

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mark.t.mueller(at)comcast
Guest

Posted: Wed Jul 09, 2008 2:08 am Post subject: Flaps Malf

As I turned base to final on my last leg home from Michigan to Virginia for

the 4th of July weekend, my flaps malfunctioned in a very interesting way...



I was able to drop my flaps 2/3rds on base leg.  After I turned final, I

depressed the switch to drop the last 1/3rd, but nothing happened.  I cycled

the switch a couple times, but the flaps would not come down any further.



I flipped the switch up, and the flaps started to retract, so I immediately

stopped and tried to depress the switch in the down position again, but the

flaps would still not come down.  I tried a couple times, but no luck.  So I

kept the flaps where they were until after landing.



The flaps retracted fine after landing, but would not come back down on the

ground.



A local guy believes it to be a problem with the lower limit switch.  This

is the second time in the last six months this has happened, and the last

time the local guy said the same thing, but obviously he did not fix the

root cause of the problem.



WSY???  What's the most likely culprit?  Where should I look first?



Thanks,



Mark

Tiger N1533R

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flyv35b(at)minetfiber.com
Guest

Posted: Wed Jul 09, 2008 5:13 am Post subject: Flaps Malf

Could be the limit switch or maybe just a wire that came off the terminal at 

the flap switch or at the limit switch.



Cliff

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david(at)carneyaviation.c
Guest

Posted: Thu Jul 10, 2008 3:19 am Post subject: Flaps Malf

# After I turned final, I depressed the switch to drop the last

# 1/3rd, but nothing happened.



# A local guy believes it to be a problem with the lower limit switch.



Since the flaps didn't reach the lower limit, it's hard to see how the limit

switch could be the culprit, unless it stuck closed.  Wouldn't the flap

switch itself be a more likely cause?

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RLC(at)rlcarmichael.com
Guest

Posted: Thu Jul 10, 2008 4:14 am Post subject: Flaps Malf

"Since the flaps didn't reach the lower limit, it's hard to see how the

limit

switch could be the culprit, unless it stuck closed.  Wouldn't the flap

switch itself be a more likely cause?"



Could be but my guess would be the flap motor.  Electrical motor has

overtemp switch.  When they start to wear out they overheat during operation

- temp switch cuts off motor.  Minutes later, it cools off enough to operate

again for a little while anyway.



I've had this happen on two different planes.



Richard Carmichael

Appraisal Supervisor

RL Carmichael & Assoc, Inc

757-465-5600  Fax 757-465-5636

RLCarmichael.com



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GrummanDude

Joined: 15 Jan 2006
Posts: 926
Location: Auburn, CA

Posted: Thu Jul 10, 2008 10:05 am Post subject: Flaps Malf

You are absolutely correct.  I'd have to go over the wiring diagram to see what the failure modes would be.  The only thing that would stop the flaps from going down, WRT the limit switches, would be something jamming the limit switch prior to the down limit.  If the switch appears to be OK, then it's something else.  By-the-way, the switches fail open, not closed.  So if the switch failed, check to see if something jammed into the switch.  Not likely, but, you never know.

 

  PS, you can find the wiring diagram for your plane on my web site.  

  

 

  www.AuCountry.com

  (on the left side there is a button marked) Technical 

  it's in there.

 

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