TB20GT Miscellaneous Parts

This page contains random data on alternatives to Socata official parts. I will be updated as I find more part numbers. Unless noted, the parts are the actual identical parts. Also, parts listed are for the GT aircraft airframe serial number range and may or may not be correct for earlier serial numbers.

Windshield and other transparencies

Alternatives available from Josef Weiss Plastic GmbH or here.

This firm does various bits.

Swisstac/EAO Switches/Indicators (on top of TB20 LH instrument panel) 1 2

Lamp extractor farnell.co.uk P/N 149-227
Lens extractor farnell.co.uk P/N 141-235

Some older TBs are believed to use the EAO Series 41 switches/indicators.

Landing Gear Limit Switches

These are made by Crouzet in France. There are two types: the blue plastic ones which indicate the gear is UP (which from Socata cost about £100 each), and the more sturdy (and more safety-critical) metal ones mounted on the gear mechanism (which from Socata cost about £1500 each).

For the blue plastic switch, the web page is here and it is obvious that the Socata switch is the Crouzet 83139, with some kind of suffix (probably 008) to specify the actuator etc. The data sheet is here. From Crouzet dealers, these are about £28 with an MOQ of 10 pieces.

For the metal limit switch, Socata P/N TB30-61018-003, the Crouzet P/N is 83778012 (drawing). Crouzet list this as a "custom part for a Socata TB20" (hey, there's a suprise...) and it is not listed on their website. This P/N has the Tyco/Amp connector attached.

The same part without the connector is 83778011 (data sheet) which costs £332 from Crouzet dealers.

The connector can be obtained from various places e.g. mouser.com; it comprises of several parts. It is cheap enough - probably under £10 for all the bits - but is not really suitable for aviation use because it is not properly sealed and uses crimp contacts which will rot away. I don't know why Socata used it in a location where it will obviously get wet etc. If I was rewiring this, I would use a proper mil-spec connector.

There is also the 83778021 switch

which is identical to the 83778011 but the wires come out at a right angle; it should still be usable OK. The 83778 series is all "aerospace" parts and can be purchased from AMSAFE who have one UK branch at tel: +44 (0) 1903 810593, fax: +44 (0) 1903 879135. The Crouzet website is littered with incorrect pictures of switches and is misleading. These switches should last many times the life of the aircraft - unless they are allowed to corrode, etc.

TB20 locks

On serial numbers past about 720, these are KESO 1000 which are made by KESO Systems. A UK contact is:

Assa Abloy
Wood Street
Willenhall
West Midlands
WV 13 1 LA
T +44 190 236 69 11
F +44 190 263 46 66

The total cost for 2 keys (including VAT, post and packing) is about £36.

Another contact is

Annie SAVAJOL
Export Department
JPM SAS
Route de Paris Avermes
03000 Moulins France
Tel 33 (0)4 70 48 40 72
Fax 33 (0)4 70 48 40 98
www.jpm.fr
SAVAJOL.Annie <SAVAJOL.Annie@JPM.FR>

Soundproofing Material

This is available as a kit from Socata, but alternative materials should be of a higher quality than the Socata stuff which starts to perish in about 3-4 years. This company (local copy) can supply better stuff.

Avionics Relays

Socata sell only the complete PCB (example schematic) with four of these, P/N TB20-65746000 (unverified) for about $420. The individual relays are made by Cartier/Savoy in France, but getting them to talk is like pulling teeth. After some effort I located a distributor: Britax. The original P/N was 03523 and in 2011 this was reportedly superceded by P/N 20 441 006. The supplier had some of the 03523 in stock and I bought the lot. They are a tiny fraction of the cost of the whole assembly from Socata. They are basically very ordinary 28V commercial vehicle relays. Many other firms (Omron, Potter & Brumfield, Panasonic CB1P24, Durakool, etc) make relays to the same pattern and some with a much better contact rating, but as usual Socata chose to use a French manufacturer. I am happy to sell the Cartier relays I have, in bundles of four, for US$20 per relay, plus shipping (no 8130-3 etc).

Moritz Gauges

These are here (local copy). They can be found on some late-model TB aircraft.

Wheels

As with much of GA, these are made by Cleveland (local copy).

More parts:

Other 3rd Party TB Parts Suppliers

Many aviation parts have STCs for the TB range - either for TBs specifically or for use with one of the engines - and it would be impossible to list them all. The following items are specific to the aircraft:

LoPresti Wheel covers
Bruce's Custom Covers ( aircraft covers and cowling plugs)

This page last updated 11th April 2012

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