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Mitchell Counter Clockwise Mechanical Tachometers
Overview
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In 1985 AC discontinued production of the popular “RT” series of mechanical tachometers. Mitchell immediately entered the market to fill the void. These tachs feature exceptional accuracy and reliability. Mitchell tachs come with a factory-direct 2 year warranty. The range on all models is 500 to 3500 RPM. Accuracy is +/- 25 RPM from 1000 to 3000 RPM. Determine the correct part number from the chart below. All Mitchell tachs are FAA approved to TSO-C49b for certified aircraft. 10-02354 for custom range marks (specify ranges, 45 day lead time). 10-02479 to set hours (specify hours, 45 day lead time). Direction of rotation is defined as when viewing the front of the tachometer. |
Reference Chart
| IFR P/N | MITCHELL P/N | STEWART WARNER NO. | AC TYPE | DIR. OF ROTATION | AVG. CRUISE RPM |
Aero Commander: A9, A9A, A9B | |||||
| 55-35-7 | D1-112-5023 | P-551-AZ | RT-7 | Clockwise | 2300 |
| Beech: 35, A3S, B35, 35R | |||||
| 55-35-8 | D1-112-5122 | P-551-AYZ | RT-8 | Clockwise | 2050 |
| Aeronca--Champion, Chief (early models) Piper--PA15, PA18, (W/TCM eng) | |||||
| 55-35-9 | D1-112-5030 | P-551-AZH | RT-9 | Counter- clockwise | 2300 |
| Aeronca--Champion, Chief (late models)Champion--7AC, 11AC, 7CCM Beech--All Musket | |||||
| 55-35-10 | D1-112-5124 | P-551-AZJ | RT-10 | Counter- clockwise | 2050 |
| Bonanza Models-G35 thru V35, V35TC, 36, A36, 95, B95, B95A, D95A Cessna: 150, 152, 172, 177, 185 & 188 (with IO-520 eng), 206, 207, 210, 310, 320 Helio: H250, H391, H392, H395 Navion: E, F, G Stits: SA9A, SA9B | |||||
| 55-35-11 | D1-112-5025 | P-551-TA | RT-11 | Clockwise | 2566 |
| Bellanca/Champion--7AC Stinson--105,108 | |||||
| 55-35-12 | D1-112-5032 | P-551-AZK | RT-12 | Counter- clockwise | 2566 |
| Aero Commander (Ayres Corp.) B1A, S2B, S2C, S2D, S2R Stearman--A75 (P & W eng.) | |||||
| 55-35-14 | D1-112-5028 | P-551-AZA | RT-14 | Clockwise | 1800 |
| Cessna--175 | |||||
| 55-35-15 | D1-112-5034 | P-551-AZB | RT-15 | Clockwise | 3000 |
| Grumman--G164 | |||||
| 55-35-16 | D1-112-5029 | P-551-AZL | RT-16 | Counter- clockwise | 1800 |
| Maule--M5/6/MX7-180, M5/6/7/MX7-235 | |||||
| 55-35-17 | D1-112-5024 | N/A | RT-17 | Clockwise | 2400 |
*The specific tachometer listed is best suited if the installation has this approximate cruise rpm. Direction of rotation must be compatible with the previous tachometer that was used. | |||||
Specifications
- Instrument Size: 3-1/8”
- Dial Range: 300 -3500 RPM
- Weight: 13 Oz.
- Accuracy: +/- 25 RPM, 1000 – 3000 RPM
- Depth: 3-1/2”
- Approval: TSO C49b
- Warranty: 2 years Factory Direct
Reviews
Good service and delivery
I bought this tach to replace an old failed unit. The old hardware was not usable on the new tach, and I recommend the available instrument install kit which uses a ring with 4 swagged nuts...make a simple install.!!
Verified Purchase
Mitchell Tachometer P/N D1-112-5032
Instrument arrived alive and on time. Price was the price everything in aviation is pricey, so no opinion there. The instrument is installed but due to weather, hasnt been operated. The mechanic had a bit of trouble installing it directly into the Aeronca 7AC panel hole some modifications were required. Overall, the rating is favorably neutral until we can use it in flight---spring, perhaps. Aloha.
Had the Tach Time set. Numbers misaligned. Shipped it back to Mitchell whose response is that is the way they are. Had markings put on the tach but they are not visible looking at the tach from the pilots seating position. I would spend the extra money and get a different tach.
Purchased this tach to replace one that was reading low on the rpm. Did my runup and took off and it started to indicate 0.1 hours before falling back to 0.0. then it accumulated 0.2 hrs before falling back to 0.0 It took and hour to put it in and another to take it back out. Now I have to pay again to send it back to Mitchel for warranty service. This is getting expensive. I think I would have come out ahead buying a used tach on Ebay.
Verified Purchase
Mitchell Tachometer P/N D1-112-5124
Q&A
Please note, Aircraft Spruce Canada's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce Canada assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.
Per the manufacturer the ratio is 2:1.
Direction of rotation is defined as when viewing the front of the tachometer, Direction of rotation must be compatible with the previous tachometer that was used.
