• Welcome to the new Commander Owners Group Forums. Please bear with us as the kinks are worked out and things are tweaked. If you have any questions or issues with the new platform, please post them here.

Elevator Inoculation

jrichards

Sponsor
Supporting Member
Sponsor
South Burlington, VT
Aircraft Year
1978 580
Aircraft Type
Super Commander
Reg Number
N555LP
Serial Number
14405
Hi All,

Aerodyme yesterday received FAA-PMA for the improved elevator hinge fitting assemblies and is taking orders at a special pre-buy price for deliveries to start later in June.

The FAA-PMA means the fitting assemblies are now approved for installation. Separate concurrence from the Wichita ACO is required for them to be accepted as a terminating action for the AD. I have requested that concurrence letter from Wichita, but expect it may be a few weeks in normal propagation through that office. They have been involved in this design from the beginning, and have always referred to these fittings as "the terminating action" in their communications with us. We expect their prompt concurrence for the case of PMA spars and PMA hinges being installed simultaneously, but would not be too surprised if they were to request additional substantiation with respect to use on in-service spars, particularly the case of high-time spars. I am confident we can satisfy any requests they may make.

Those of you ready to order the inocluation kits now can take advantage of the special pricing, a savings of $400, or you can wait and buy later at the regular price.

No complaints about the pricing please. This proper solution has been a heavy-duty engineering and manufacturing project. It would have made no sense to attempt a sheet metal patch, splice, etc. Those "quick" solutions have been tried before in other places on our airplanes, i.e. wing spars, fin ribs, etc and have failed in most cases. Our elevators are too precious to subject to repeated trauma of failed half-measures.

Martine and I greatly appreciate your support, and the many pre-orders we have already received. We are both looking forward to a little breather after we have accomplished all this for all of you, as since January I have been working 12 x 6 + Sundays with only Easter Sunday off, and Martine has not been far behind.

Please fill out and fax the order form, below, and try to keep call-ins to a minimum as our phones have been ringing "off the hook".

The special price is $850 for two kits (covers both elevators).
The regular price is $625 per side.

I'll monitor this thread for questions.

Thanks,
Jim
 

Attachments

Last edited:
Re: Elevator Inoculation

Great job, Jim.
 
Re: Elevator Inoculation

Many thanks Jim

Fax returned with order

Fred Parkes
N928HW
2000 115
EGSG Stapleford UK
 
Re: Elevator Inoculation

Thanks Jim for the support Martine and you provide. Enjoyed talking with her on the phone. Good luck with the new Grand baby. I'm ready for my babies (ie your parts) to be delivered soon too. Between medical and AD's, I'm ready to do some serious flying!

Hi All,

Aerodyme yesterday received FAA-PMA for the improved elevator hinge fitting assemblies and is taking orders at a special pre-buy price for deliveries to start later in June.

I'll monitor this thread for questions.

Thanks,
Jim
 
Re: Elevator Inoculation

Jim,

Thank you for all your hard work. Fax order has been sent.


Regards,

Roberto Schroeder
 
Re: Elevator Inoculation

Thank you Jim. Fax Incoming tomorrow am.
 
Re: Elevator Inoculation

Thanks Jim! Your timing is impeccable. Dale was asking me whether to put mine together before we got them. I was hoping your announcement was forthcoming.

My wife thanks you too. Those pesky elevators were messing with her vacation plan!
k
 
Re: Elevator Inoculation

Congratulations Jim. I'm sure there were many hours in this project!
 
Re: Elevator Inoculation

Great work Jim. Does the kit impact either the weight/balance or the balancing of the elevators?
 
Re: Elevator Inoculation

Well done Jim, whilst I'm sure we have all been anxious to get back in the air I for one as an engineer appreciate the time and effort you and Martine have put in to finding a one time once and for all fix that will not need costly and time consuming constant inspections. I look forward to seeing those spars and fittings winding their way " Down Under" to Australia soon.

I hope Martine is planning a well earned beak for you when all this is over

Regards
Keith Bowden
In the Land of Aus
 
Re: Elevator Inoculation

Hi Phil,

There is a small weight, and balance, change which can be handled by calculation and adding one AN970-4 washer at the mass balance attach bolt.

Jim
 
Re: Elevator Inoculation

Jim

I am trying to get my head around all of this.

I have a 112B which was inspected by the rib removal method and found to have no cracks. 3000+ hours. So as the AD has no continuing action after the inspection as yet and it would appear that your fix is the only game in town to make this go away. Are you saying that a perfectly good original spar with no cracks should be replaced along with the hinges X 2. I'm trying to work out the cost of this and with the only game in town seemingly being in Guernsey any monopoly on spar/hinge replacement seems to be pointing in the direction of being expensive. This would not usually be a problem but I can't help thinking I am throwing away something which is proven to be robust over 34 years and high (relatively) hours.

Do you think we are in for a whole world of destructive inspections for those whose aircraft are still in good condition? There are few engineering organisations in this country who have any of the approved scopes and the ones that do are the most expensive, we are also under Part M CAMO contracts here which would require the contracted engineering organisation to approve another engineers work and that approval would have commercial implications for them.

Based on the hinge and spar pricing, shipping, tax on the shipping, engineering, painting, etc. I believe a UK pilot having the whole job done is looking at around $6,500 that is estimating 15 hours.

As I said I am thinking out loud here but these are legitimate concerns in my own mind and I would appreciate your insights.
 
Re: Elevator Inoculation

Lawrence,

This is not directly addressing your question; however, since the final word is not in about a terminating fix, and since you are not presently grounded w/ cracked spars and not knowing for certain if continuing inspections may be required even w/ new parts installed, you may want to consider the purchase of your own scope which you may provide to a less expensive engineer to complete the inspection. Satisfactory scopes are just not that expensive compared to completely replacing otherwise airworthy parts (that may still require an inspection anyway). Just some food for thought until the ink is dry on a final AD. Wouldn't be too hasty here given the dollars/euros/quid involved.

Far as that goes,... perhaps either rent it out to others for inspections or join in a buyers group to make the purchase and stash it at a shop that could be used by the group members. Shop might lease it from you for use on other aircraft. Lots of creative options exist. Just no good reason for repetitive destructive inspections.
 
Last edited:
Re: Elevator Inoculation

Are you saying that a perfectly good original spar with no cracks should be replaced along with the hinges X 2..


The way I understand it, if your spars are OK you do not need to replace them. Just the hinges.
 
Re: Elevator Inoculation

If your spars are OK, you don't need to replace anything.

The new hinges MAY be approved as a terminating fix but the FAA hasn't approved anything as a terminating fix... yet.

If the (or a) new hinge design is eventually approved as a terminating fix, then it will be necessary to review the terms of that approval. Each owner needs to make their own decision as to how/when to proceed but knowing the curve balls the FAA may serve up, it may be more cost effective to monitor the situation until their complete edict is published. ...or not. Your checkbook, your call.
 
Last edited:
Re: Elevator Inoculation

Bill

Good advice-well said!
 
Re: Elevator Inoculation

Jim
------
I have a 112B which was inspected by the rib removal method and found to have no cracks. 3000+ hours. So as the AD has no continuing action after the inspection as yet and it would appear that your fix is the only game in town to make this go away. Are you saying that a perfectly good original spar with no cracks should be replaced along with the hinges X 2. Unquote]

Under another thread on 6/8.11-- 1977 112 -- Roberto Schroeder reported:
"During inspection I was very surprised to see how sharp the edge of the hinge was. I can see how any stress is transferred to a rather thin area where the edge digs in, right at the beginning of the inner radius of the spar. We rounded the edge of both hinges somewhat before re-attaching.-------
__________________
Roberto Schroeder
XB-RMG
'77 112-TCA"

Lawrence, under your circumstance, I suspect that Roberto has the answer to preventing the condition eventually causing cracks. Replacing the hinges with Jim's redesign would of course be the ultimate solution, but perhaps unnecessary in this case. There has been a history of tail ADs and other metal failures/cracks that have manifested themselves in some aircraft but in aircraft like mine have not shown up (yet). I am referring specifically to the rib replacement in the vertical tail just below the elevator (the double line of horizontal rivets for the replaced rib). It is a case of just monitoring annually like Birdstrike sez.:cool:
 
Re: Elevator Inoculation

Hi All,

Regarding sharp edges on the original fittings p/n 44285-1:

Yes, agreed, take any sharpness off the edges before re-installing any factory fittings. This will help minimize the fretting on the spar webs. It will not, however, prevent the sliding of the fitting on web which is due to the inadequate attachment. The webs will continue to be under stress attack.

Regarding terminating action:

Since the FAA has not yet issued the AD amendment to add the recurring inspection requirements, there cannot yet be a terminating action because there is nothing to terminate. The amendment process, including the anticipated NPRM, etc, will likely run another 6 to 9 months before we see any "final" determinations from the FAA. Meanwhile, we are working with Wichita to get maximum clarification for you in the interim.

Regarding practical protection:

Installation of the RE2 fittings (inoculation kit) will stop the factors that are leading to the spar cracks. This is the preventive step, to avoid the possible major trauma of having to ever replace your spars. Your cost is $850 for the kit (at the special price), and approx 8 hrs for installation.

Jim
 
Re: Elevator Inoculation

Way to go Jim! Rob was happy to assist with this one.

Susie
 
Re: Elevator Inoculation

1038J went under the scope this morning.....no problems. 112 2000hrs. Does anybody know how many in the fleet have been inspected and what percentage have issues?
 
Back
Top