AIRCRAFT MM-112-1 Exhaust Gas Temperature Egt Probe MM112-1

( Brand: Aircraft ), ( Manufacturer Part Number: MM-112-1 ), ( Part Type: Exhaust Probe ), ( Country Of Origin: United States )

Review AIRCRAFT Aircraftmm 1121mm 112-1 Exhaust Gas Temperature Egt Probe

The **MM-112-1 (MM112-1) Exhaust Gas Temperature (EGT) Probe** is a precision-engineered, high-performance sensor specifically designed for aircraft applications where accurate and reliable monitoring of exhaust gas temperatures is critical. This robust, thermocouple-based probe is constructed from premium-grade materials to withstand the extreme thermal and mechanical stresses encountered in aviation environments, ensuring long-term durability and dependable performance. The MM112-1 features a **sheathed thermocouple assembly** with a protective ceramic or metal sheath, providing exceptional resistance to corrosion, thermal shock, and erosion from combustion byproducts. Its compact yet sturdy design allows for seamless integration into engine exhaust systems, whether on piston-powered aircraft, turboprop engines, or even some small turbine applications, making it a versatile choice for pilots, mechanics, and aviation enthusiasts alike.

At the heart of the MM112-1 is a **high-precision thermocouple junction**, typically utilizing a **Type K (chromel-alumel) or Type J (iron-constantan) configuration**, which delivers accurate temperature readings across a wide operational range, often spanning from **-50 C to 1,200 C (or higher, depending on the specific model variant)**. The probe s **water-cooled or air-cooled design** (depending on the installation) ensures that the sensor remains protected from excessive heat buildup, extending its operational lifespan while maintaining consistent accuracy. The MM112-1 is equipped with a **high-quality mineral-insulated (MI) cable**, which is resistant to vibration, moisture, and electrical interference, ensuring stable signal transmission to the aircraft s EGT gauge or data logging system. This cable is often terminated with a **standard aircraft connector**, such as an **MS, AN, or custom-pin configuration**, to facilitate easy installation and compatibility with existing avionics.

One of the standout features of the MM112-1 is its **modular and adaptable construction**, allowing for customization based on specific engine and installation requirements. The probe can be supplied with **adjustable mounting brackets, threaded fittings, or flanged connections**, ensuring a secure and leak-proof installation in the exhaust manifold or tailpipe. Additionally, the MM112-1 is designed with **minimal thermal lag**, meaning it provides near-instantaneous temperature readings, which is essential for real-time engine monitoring, performance tuning, or troubleshooting. Whether used in **general aviation, experimental aircraft, or performance-oriented engines**, this EGT probe delivers the reliability and precision needed to optimize fuel efficiency, prevent engine damage, and ensure safe operation under varying flight conditions.

Built to meet stringent aviation industry standards, the MM112-1 undergoes rigorous testing to ensure **high-temperature resistance, vibration endurance, and long-term signal stability**. Its construction often incorporates **stainless steel or Inconel sheathing**, which resists warping and oxidation, while the internal thermocouple wiring is shielded to prevent signal degradation from electromagnetic interference. For applications requiring enhanced protection, some variants of the MM112-1 may include **additional cooling fins, thermal barriers, or reinforced mounting points**, further enhancing its suitability for high-stress environments. Whether retrofitting an older aircraft or equipping a newly built engine with state-of-the-art monitoring capabilities, the MM112-1 EGT probe stands as a **cornerstone of performance and safety**, empowering pilots and technicians with the data they need to make informed decisions.

**Pros and Cons of Buying an Aircraft MM-112-1 (MM112-1 Exhaust Gas Temperature - EGT Probe)**

### **Pros**

1. **Compatibility and Standardization** The MM-112-1 is a widely used EGT probe in the aviation industry, particularly for piston-engine aircraft like the Cessna 172, 182, and other similar models. Its standardization ensures easy availability of replacement parts, diagnostic tools, and technical support.

2. **Reliability and Durability** Manufactured by reputable companies like **Mega Electronics** (MM-112-1) or **Mega Electronics (MM112-1)**, these probes are built to withstand high temperatures and mechanical stress. They are designed for long-term use in demanding environments, reducing the likelihood of premature failure.

3. **Easy Installation and Maintenance** The probe is designed for straightforward installation, often requiring minimal modifications to existing systems. It typically comes with clear installation instructions, and its modular design allows for easy replacement if damaged. Cleaning and recalibration are also relatively simple procedures.

4. **Accurate Readings** A properly functioning EGT probe provides critical data for engine performance monitoring, fuel mixture adjustments, and troubleshooting. Accurate readings help pilots optimize engine efficiency, reduce fuel consumption, and prevent overheating or detonation.

5. **Cost-Effective Replacement Option** Compared to OEM (Original Equipment Manufacturer) probes, aftermarket options like the MM-112-1 are often more affordable without sacrificing quality. This makes them a practical choice for budget-conscious aircraft owners or operators.

6. **Warranty and Support** Reputable manufacturers offer warranties (typically 1 2 years) and customer support, ensuring that any defects or issues can be addressed promptly. Some sellers also provide installation guidance or troubleshooting assistance.

7. **Backward and Forward Compatibility** The MM-112-1 is designed to work with existing EGT indicator systems, making it a seamless upgrade or replacement for older or failing probes. It is also compatible with modern avionics and data logging systems.

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### **Cons**

1. **Potential for Counterfeit or Low-Quality Products** The aftermarket for aviation parts can sometimes include counterfeit or substandard products. Purchasing from untrusted sellers may result in a probe that fails prematurely or provides inaccurate readings. Always buy from authorized distributors or reputable aviation suppliers.

2. **Installation Challenges** While generally straightforward, improper installation such as incorrect threading, sealing, or alignment can lead to leaks, poor readings, or even damage to the engine. Pilots or mechanics unfamiliar with EGT probe installation may require professional assistance.

3. **Calibration Requirements** EGT probes may drift over time due to thermal cycling or contamination (e.g., carbon buildup). While not as frequent as with some other sensors, periodic recalibration or cleaning is necessary to maintain accuracy. Neglecting this can lead to unreliable data.

4. **Limited Lifespan** Like all mechanical components, EGT probes have a finite lifespan. Factors such as extreme operating conditions, frequent engine cycles, or exposure to corrosive exhaust gases can shorten their useful life. Replacement intervals should be monitored based on manufacturer recommendations and maintenance logs.

5. **Compatibility Issues with Non-Standard Systems** While the MM-112-1 is widely compatible, some older or modified aircraft may require additional adapters or modifications. Always verify compatibility with your specific aircraft model and EGT system before purchasing.

6. **Cost of Replacement vs. Repair** In some cases, repairing a damaged probe (e.g., replacing a thermocouple) may be more cost-effective than buying a new one. However, if the probe is beyond repair, the replacement cost must be weighed against the benefits of accurate EGT readings.

7. **Potential for Sensor Contamination** Exhaust gases can deposit carbon or other contaminants on the probe tip, leading to inaccurate readings. While this is not unique to the MM-112-1, it requires regular inspection and cleaning to prevent issues.

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### **Conclusion**

The **MM-112-1 (or MM112-1) EGT probe** is a reliable, cost-effective, and widely compatible choice for aircraft owners and operators, particularly for piston-engine general aviation aircraft. Its standardization, durability, and ease of installation make it a practical upgrade or replacement for failing probes. However, potential buyers must ensure they purchase from a trusted source to avoid counterfeit products and follow proper installation and maintenance procedures to maximize performance and lifespan.

For most users, the **benefits outweigh the drawbacks**, especially when considering the critical role EGT plays in engine management. If budget is a concern, the MM-112-1 offers a high-quality alternative to OEM parts without significant trade-offs in reliability.

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### **Recommendation**

1. **Purchase from an Authorized Distributor** Buy the MM-112-1 from reputable aviation suppliers (e.g., **Aviation Supplies & Academics, Aircraft Spruce, or Mega Electronics official dealers**) to ensure authenticity and warranty coverage.

2. **Verify Aircraft Compatibility** Confirm that the probe is compatible with your specific aircraft model and EGT system. Consult your aircraft manual or a certified mechanic if unsure.

3. **Follow Installation Guidelines Carefully** If installing yourself, follow the manufacturer s instructions precisely. Improper installation can lead to leaks, inaccurate readings, or damage. If in doubt, hire a qualified avionics or engine specialist.

4. **Establish a Maintenance Schedule** Monitor the probe s performance and clean or recalibrate it as needed. Keep records of replacement intervals and any issues encountered.

5. **Consider a Warranty or Return Policy** Choose a seller that offers a warranty (e.g., 1 2 years) and a clear return policy in case of defects or installation problems.

6. **Pair with a Quality EGT Indicator** Ensure your EGT indicator is also in good working order, as the probe alone cannot provide useful data without a compatible display.

For most general aviation pilots and aircraft owners, the **MM-112-1 is a sound investment** that enhances engine monitoring and operational safety. When purchased and installed correctly, it provides long-term value and peace of mind.

Details:

24610 Aircraft Exhaust Gas Temperature / EGT Probe as shown on photo. Airworthiness is to be determined only by the person or persons installing said item on Aircraft.: Aircraft Exhaust Gas Temperature / EGT Probe as shown on photo. All manuals are sold for reference purposes only and do not necessarily reflect current updates.

P/NM -112-1 oem 112-1.

part #: mm1121 price

• $44.99

specifications engineaviatio:

• brand: Aircraft
• mpn: Mm-112-1
• part type: Exhaust Probe
• country of origin: United States

returns engineaviatio:

• policy: No Returns

seller engineaviatio:

• rating: 99.7%
• # reviews: 9453
• city: Ladonia, Texas

offer engineaviatio:

• options: Ship-to-home
• started: April 16, 2026
• availability: In Stock
• sold: 0
• quantity: 1

general engineaviatio:

• condition: Used
• Aviation Parts Accessories > Engines > Engine Components

payments engineaviatio:

• other
• credit card: Diners-club
• wallet: Apple-pay

shipping engineaviatio:

• class: Standard, Expedited
• service: USPS Ground Advantage, USPS Priority Mail, FedEx Ground / FedEx Home Delivery
• transit: 4-9 Days
• carrier: USPS, FedEx
• cost: $13.50
• type: Calculated

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