The product has evolved into three different models, depending upon several different factors. In the product chart below are photographs of each. The original product is in the first column and to install requires the drilling of holes in a specific pattern in the firewall. An aluminum plate with integral nuts is attached to the rear of the firewall with two screws. To then install the control, it is passed through the large hole, including the two loose square clamps; and attached at each end, thus determining the ideal path through the firewall.
Next, the two half-balls are placed around the cable and against the firewall. Lastly the four screws attach the two square clamps over the ball halves and the assembly is tightly in place. The two ball halves are made from aluminum and provide the objectives of better fire protection and cable positioning.
For use on certificated aircraft the FAA requires firewall components to withstand temperatures above the melting point of aluminum and thus the steel ball, “S” model was developed, and is shown in the middle column. It is identical to the original with the exception of the substitution of steel for aluminum
in the ball, and more extensive metal removal from the ball to reduce the added weight of the steel. Thus the product has a higher cost of manufacture.
It was learned from field experience that to install the original design on an aircraft with the engine and accessories installed it became difficult to accurately position the required holes. A product that would require only one hole would greatly reduce this problem.
The product in the third column meets this need. It requires only one larger hole that is easily made with a common ¾ inch thin-wall electrical conduit punch, a tool common to electrical contractors. It is a more complex part to manufacture and thus is slightly more expensive. It is used on experimental aircraft since it is an all aluminum product.
PRODUCT SELECTION
The chart below lists the various properties of the products, including hole sizes available, weights, applications, and pricing. It should be noted that the aluminum ball holes may be enlarged by carefully drilling in small increment sizes up to a maximum of 3/8 inch. This is done by assembling the product, clamping it securely in a machine vice, and drilling on a drill press. If special hole sizes are needed in the steel ball models, they can be enlarged only to ¼ inch, an will then need corrosion resistant protection in the drilled hole.
“EYEBALL” Spherical Metal Grommet |
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Use SE961B series for experimental aircraft.
Use SE961S series for certified aircraft firewalls.
TTP Series only requires one hole.
See Part Number Change |
ball matl.
appx. wt.
part no. |
alumn.
0.10#
TTP-XXXB |
steel
1.11#
TTP-XXXS |
alumn.
0.12#
TTP-XXXA |
hole size
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Applications
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.125" |
125B |
125S |
125A |
Oil pressure, primer |
.188" |
188B |
188S |
188A |
ACS cable, 730, 740, 1770, A1780 Bowden Cable |
.218" |
218B |
218S |
218A |
ACS cable, 700, 1340 |
.240" |
240B |
240S |
240A |
750, 770, 780, 790, 800, 810, 820, 920, 930, 950, 960, 970, 1550, 1600, 1750, 1760, 1860, 1870, 1970 |
.250" |
250B |
250S |
250A |
Tubing |
.260" |
260B |
260S |
260A |
Tachometer cable |
.375" |
375B |
N/A |
375A |
Tubing |
| Price, Each |
$26.00 |
$29.00 |
$31.00 |
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PURCHASING
Shipping may be by UPS or US Post. UPS shipped ground is flat $10, but insured only to $100. For more insurance please ask for quote. Shipping by US Post is a flat $3 with no insurance or tracking. For insurance please ask for quote.
PART NUMBER CHANGE
There is a part number change being affected currently, but due to existing inventories it will require some time to complete. Following is an explanation of the relative part numbers.
OLD PART NUMBER NEW PART NUMBER
TTP-XXX TTP-XXXA
SE961-XXXB TTP-XXXB
SE961-XXXS TTP-XXXS
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