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No gear up indicator

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Bill1200

Joined: 19 Oct 2008
Posts: 111
Location: medford oregon

Posted: Wed Nov 26, 2008 8:51 am Post subject: No gear up indicator

On my trip I had a gear up bulb not come on (nose wheel) Tried changing bulbs..no change. Flew by a tower and confirmed it wasn't hanging down. So, now I need to know where the relay switch is for the up indication and how to test it on the ground, thanks. Just one of a bizillion questions that arose on this cross country.

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dsavarese0812(at)bellsout
Guest

Posted: Wed Nov 26, 2008 9:12 am Post subject: No gear up indicator

The microswitches for the gear lights are on the  drag link (DOWN light) and the uplock (parrot hook) assembly (UP  light).  The problem may not be the UP microswitch on the uplock  assembly.  It could be the lever mechanism itself binding internally within  the uplock assembly.  There is an arm that engages and disengages the  microswitch.  When the nose gear (or the mains for that matter) is up and  locked into the parrot hook, the arm on the assembly that engages and disengages  the microswitch will be disengaged from the microswitch.  Sometimes the  assembly mechanism has not been properly serviced over the years and the arm  mechanism hangs up and will not disengage the microswitch.  If the airplane  has ever been landed gear up, the uplock assembly mechanism can be bent slightly  causing the parrot hook mechanical lock mechanism not to lock and thus not allow  the arm to disengage from the microswitch.

  

 Push up on the parrot hook and lock it in  place.  To release the parrot hook, note the spring in front of the hook  and push up on the lever on the end of the spring opposite the parrot  hook.  If it doesn't lock in place when you push up on the parrot hook, the  mechanism is not working correctly.  If it does lock in place, watch the  arm that engages the microswitch and see if it disengages the microswitch.   These microswitches have a very distinctive "click" when then engage and  disengage.  If the arm moves away from the microswitch, then push the  button on the microswitch to hear the "click" in both directions.  While  doing this, have someone in the cockpit turn the BATTERY switch on and the GEAR  light toggle switch on the left side console.  See if the nose gear light  goes on and off when depressing and releasing the microswitch manually.  If  it doesn't go on and off, it is possible the microswitch could be bad.  But  I would use an ohm meter and check the continuity before replacing the  switch.  Especially if you here the distinctive "click".  It could  also be a bad bulb socket/wiring on the instrument panel.

  

 Many times these socket rotate when the lense is  removed.  If rotated too many times or too far in one direction, the  brittle Russian wires can break off at the back of the socket.  Bingo....no  light at all.

  

 Hopefully this will help you diagnose the  problem.

 Dennis

  

 [quote]   ---

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hkgibby(at)yahoo.com
Guest

Posted: Wed Nov 26, 2008 1:53 pm Post subject: No gear up indicator

Bill,I have a no "nose up" indication as well.  Like Dennis suggested rule out the electrical part of it by pushing on the microswitch button (it will click) while someone is looking at your cockpit gear lights.  The nose red(up) light will most likely come on which means that the adjustable thumbscrew/hammer is not travelling far enough with the uplock to push the microswitch in.  I tried adjusting that and ruled out the uplock and I found with mine that the entire crossbrace that the microswitch is attached to is bent upwards just enough to be "out of reach" so to speak of the thumbscrew.  Not sure if the a/c had a gear up or it is just from the NLG slamming up over the years without air restrictors.  I am going to shim the assembly with a washer or two to close that gap and I am sure that will fix it.  I think that this is not that uncommon with the nose gear.  Better to have with "up" indications than "down" anyday.  Good luck.Hank GibsonCJJacksonville, FL 

Sent from my Verizon Wireless BlackBerry

From:  "A. Dennis Savarese" <dsavarese0812(at)bellsouth.net>

Date: Wed, 26 Nov 2008 11:12:28 -0600

To: <yak-list(at)matronics.com>

Subject: Re: Yak-List: No gear up indicator

The microswitches for the gear lights = are on the=20 drag link (DOWN light) and the uplock (parrot hook) assembly (UP=20 light).  The problem may not be the UP microswitch on the = uplock=20 assembly.  It could be the lever mechanism itself binding = internally within=20 the uplock assembly.  There is an arm that engages and disengages = the=20 microswitch.  When the nose gear (or the mains for that matter) is = up and=20 locked into the parrot hook, the arm on the assembly that engages and = disengages=20 the microswitch will be disengaged from the microswitch.  Sometimes = the=20 assembly mechanism has not been properly serviced over the years and the = arm=20 mechanism hangs up and will not disengage the microswitch.  If the = airplane=20 has ever been landed gear up, the uplock assembly mechanism can be bent = slightly=20 causing the parrot hook mechanical lock mechanism not to lock and thus = not allow=20 the arm to disengage from the microswitch.

Push up on the parrot hook and lock = it in=20 place.  To release the parrot hook, note the spring in front of the = hook=20 and push up on the lever on the end of the spring opposite the parrot=20 hook.  If it doesn't lock in place when you push up on the parrot = hook, the=20 mechanism is not working correctly.  If it does lock in place, = watch the=20 arm that engages the microswitch and see if it disengages the = microswitch. =20 These microswitches have a very distinctive "click" when then engage and =  disengage.  If the arm moves away from the microswitch, then push = the=20 button on the microswitch to hear the "click" in both directions.  = While=20 doing this, have someone in the cockpit turn the BATTERY switch on and = the GEAR=20 light toggle switch on the left side console.  See if the nose gear = light=20 goes on and off when depressing and releasing the microswitch = manually.  If=20 it doesn't go on and off, it is possible the microswitch could be = bad.  But=20 I would use an ohm meter and check the continuity before replacing the=20 switch.  Especially if you here the distinctive "click".  It = could=20 also be a bad bulb socket/wiring on the instrument panel.

Many times these socket rotate when = the lense is=20 removed.  If rotated too many times or too far in one direction, = the=20 brittle Russian wires can break off at the back of the socket.  = Bingo....no=20 light at all.

Hopefully this will help you diagnose = the=20 problem.

Dennis

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LawnDart

Joined: 05 Jun 2006
Posts: 64

Posted: Wed Nov 26, 2008 8:20 pm Post subject: Re: No gear up indicator

Shouldn't the light come on when the indicator lamp test button (just below mag switch) is pushed??

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dsavarese0812(at)bellsout
Guest

Posted: Wed Nov 26, 2008 8:31 pm Post subject: No gear up indicator

Yes.

 Dennis

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Bill1200

Joined: 19 Oct 2008
Posts: 111
Location: medford oregon

Posted: Thu Nov 27, 2008 4:20 pm Post subject: Re: No gear up indicator

Thanks all, will check it out tomorrow

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