EGT Sender

[170C]

I have a Westach EGT gauge that has not worked for many years. I don't really need it as I lean by rpm. However it bugs me to have an instrument that doesn't work so I am looking to purchase a new sender. Spruce lists several senders and I am attempting to determine which one is the correct one without having to first remove the old one. They have a 1" long tip model; a 1/2" long tip model and a long tip 1/4" threads model. Any suggestion as to what the correct one might be?

[GAHorn]

Do you have a MEL? Did you know that if your airplane has any equipment installed it MUST be operational? (unless you have a MEL.)
Have you pulled your old sensor out? or called Westach? Each model has a specific probe. I've enlarged the SINGLE PROBE model:

Model: K28PCX
Price: $387.27
TSO C43A EGT gauge system for 4 cylinder includes:2A2P-TSO gauge=2 1/4", D/S=700-1700F/400-900C W/adj red ptr, 4:713-2DWK EGT probes=1-5/8"to 2-1/2"clamp, 1"tip, 4'lead, W/265-24 gasket, 254-20EP switch=8'leads, 186-12A2 light kit=grn W/329-24 24 VDC a...

Model: K28PDX
Price: $519.16
TSO C43A EGT System for 6 cylinder includes: 2A2P-TSO gauge 2-1/4", d/s=700-1700F / 400-900c w/ adj red ptr, 6:713-2DWK egt probes = 1 5/8 ' to 2 1/2" clamp, 1" tip , w/ 265-24 gasket, 254-21EP switch=8' leads, 186-12A2 light kit = grn w/ 329-24 vdc a...

Model: K28PX
Price: $189.36
TSO C43A EGT Gauge system for single cylinder includes: 2A2P-TSO gauge=2 1/4", D/S=700-1700F/400-900C W/ADJ red PTR, 713-2DWK EGT probe=1-5/8" to 2-1/2"clamp, 1"tip, 4' lead, W/265-24 gasket, 184A3 cable=3' & 186-12A2 light kit=GRN W/329-24 24 VDC a...

[bagarre]

Do you have a MEL? Did you know that if your airplane has any equipment installed it MUST be operational? (unless you have a MEL.)
Have you pulled your old sensor out? or called Westach? Each model has a specific probe. I've enlarged the SINGLE PROBE model:

http://www.aopa.org/Pilot-Resources/PIC ... pment-List

Good read on when/if you need a MEL.


From the article:

Am I required to have an MEL to take off with inoperative instruments or equipment?

You may take off with inoperative instruments and equipment without having an MEL only if your aircraft doesn't have an existing MEL or Letter of Authorization and the inoperative instruments or equipment meet the following criteria:

Rotorcraft, non-turbine-powered airplane, glider, lighter-than-air aircraft, powered parachute, or weight-shift-control aircraft, for which a master MEL has not been developed; or small rotorcraft, non-turbine-powered small aircraft, gliders, and lighter-than-air aircraft for which a master MEL has been developed, may fly with inoperative instruments and equipment as long as the item(s) are not one of the following four:

Part of the VFR-day type certification instruments and equipment prescribed in the applicable airworthiness regulations under which the aircraft was type certificated. Examples might be: a fuel indicator, oil pressure gauge, magnetic compass, or a cylinder head temperature gauge requirement. Note: This document may not differ from item 3 below, but it could contain additional equipment.
Indicated as required on the aircraft's equipment list, or on the Kinds of Operations Equipment List (KOL) for the kind of flight operation being conducted. An example might be, very specifically, the stall warning horn on a 1970 Cessna 150, as listed on the aircraft type certificate. For kinds of operations, this is referring to VFR, IFR, day, or night in which the aircraft can be operated.
Required by 14 CFR 91.205 or any other rule of this part (14 CFR Part 91) for the specific kind of flight operation being conducted. Example: FAR 91.205 lists day and night VFR and IFR equipment.
Required to be operational by an airworthiness directive; and
The inoperative instruments and equipment are removed from the aircraft, the cockpit control placarded, and the maintenance recorded in accordance with 14 CFR 43.9; or
Deactivated and placarded "Inoperative." If deactivation of the inoperative instrument or equipment involves maintenance, it must be accomplished and recorded, and the pilot or mechanic can determine that the inoperative instrument or equipment does not constitute a hazard to the aircraft.
Notwithstanding any other provision of 14 CFR 91.213, an aircraft with inoperative instruments or equipment may be operated under a special flight permit, or ferry permit.

[GAHorn]

The Single Engine Airplane Master Minimum Equipment LIst applicable to Cessna 170 aircraft may be downloaded at:
http://fsims.faa.gov/PICDetail.aspx?doc ... plane%20R1