( Brand: Collins ), ( Manufacturer Part Number: 622-3307-001 ), ( Part Type: Transceiver Radio ), ( Compatible Model: Vhf-251s ), ( Country Of Origin: United States ), ( Serial Number: 2037 )
Review COLLINS Rockwell Comm Transceiver Avionics Radio P/n Tso
The **Collins Rockwell 622-3307-001 VHF-251S Comm Transceiver** (Part Number: TSO-C38b) is a high-performance, aviation-grade VHF communication radio designed to deliver uncompromising reliability, clarity, and functionality for both general aviation and commercial aircraft operations. Engineered under the rigorous standards of the **Transportation Safety Organization (TSO-C38b)**, this transceiver is built to withstand the demanding environments of flight, ensuring seamless voice communication with air traffic control, other aircraft, and ground stations. Its robust construction features a **hermetically sealed, corrosion-resistant chassis** with precision-machined components, safeguarding against moisture, temperature fluctuations, and mechanical stress critical factors in maintaining operational integrity at altitudes ranging from sea level to 50,000 feet. The VHF-251S operates within the **118.000 136.975 MHz frequency range**, providing coverage for all standard aviation communication bands, including VOR, ILS, and emergency frequencies, while its **dual-channel capability** allows for simultaneous monitoring of two different frequencies, enhancing situational awareness without sacrificing efficiency.
At the heart of the VHF-251S lies **Collins Rockwell s advanced digital signal processing (DSP) technology**, which minimizes interference, reduces noise, and ensures crystal-clear audio transmission and reception. The radio incorporates a **high-gain, wideband antenna interface**, optimized for efficient signal transmission and reception, while its **automatic frequency control (AFC)** system compensates for minor frequency deviations, guaranteeing precise tuning and stable communication links. The unit s **modular design** allows for easy integration into existing avionics systems, with standard **ARINC 429 or RS-232 data buses** supporting compatibility with modern flight management systems, autopilots, and other avionics packages. Additionally, the VHF-251S features a **backlit, high-contrast LCD display** with intuitive navigation menus, enabling pilots to quickly select frequencies, adjust volume, and monitor critical status indicators such as signal strength and squelch settings.
Safety and redundancy are paramount in aviation, and the VHF-251S delivers through its **fail-safe design principles**. The radio includes **built-in self-test diagnostics**, allowing for immediate identification of potential malfunctions, while its **redundant power supply inputs** ensure continuous operation even in the event of a primary power failure. The unit s **low-power consumption** makes it ideal for aircraft with limited electrical resources, yet its **high-output transmitter** ensures strong signal projection, even in remote or high-noise environments. For operators requiring enhanced security, the VHF-251S supports **encrypted communication modes**, providing an additional layer of protection for sensitive transmissions. Whether installed in a **light aircraft, corporate jet, or regional airliner**, this transceiver exemplifies Collins Rockwell s legacy of innovation and engineering excellence, offering pilots a dependable, high-performance tool for safe and efficient communication in every phase of flight.
### **Pros and Cons of buying a Collins Rockwell 622-3307-001 VHF-251S Comm Transceiver (TSO-C38b)**
#### **Pros**
1. **TSO-C38b Certification** This radio meets the **Transportation Safety Organization (TSO) C38b** standards, ensuring compliance with FAA and international aviation regulations. This is critical for commercial, corporate, and some general aviation aircraft.
2. **Reliability and Durability** Collins Aerospace (formerly Rockwell Collins) is a well-established manufacturer with a strong reputation for producing high-quality, long-lasting avionics. The VHF-251S is designed for rugged use in aircraft environments, including temperature extremes, vibration, and humidity.
3. **Wide Frequency Coverage** The unit supports **118.000 136.975 MHz** (VHF Comm), which covers all standard aviation communication bands, including NAVAID, FSS, and approach control frequencies.
4. **Modular and Upgradable** The VHF-251S is part of the **600 Series** family, which is known for compatibility with other Collins avionics systems. Some models allow for software upgrades or integration with modern glass cockpits.
5. **Used Market Availability** Due to its age (originally introduced in the 1990s), this radio is commonly found in the **used avionics market**, making it a cost-effective option for aircraft needing a reliable VHF comm radio.
6. **Proven Performance** Many pilots and operators report few issues with this radio over decades of use, particularly when properly maintained.
7. **Compatibility with Older Aircraft** If your aircraft was manufactured before the widespread adoption of digital avionics, this analog VHF radio will integrate seamlessly without requiring major system upgrades.
---
#### **Cons**
1. **Age and Obsolescence** The **VHF-251S was introduced in the 1990s**, meaning it lacks modern features such as **digital tuning, GPS integration, or compatibility with newer avionics architectures**. Some newer aircraft may require more advanced radios.
2. **Limited Digital Features** Unlike modern **Garmin GDU-210, Bendix/King KMA-25, or Garmin GTX-330** radios, the VHF-251S does not support **digital voice recording, data link, or ADS-B**. This can be a drawback for operators who rely on digital communication features.
3. **Maintenance and Parts Availability** While Collins Aerospace still supports older models, **spare parts and technicians familiar with this specific unit may be harder to find** compared to more recent avionics. Some aftermarket support may be required.
4. **No Built-in DME or NAV Integration** The VHF-251S is a **standalone comm radio** and does not include **DME (Distance Measuring Equipment) or VOR/ILS navigation functions**. If your aircraft requires these, you would need separate units.
5. **Potential for Software Limitations** Some newer airspace restrictions or communication protocols (e.g., **Mode S, ADS-B Out**) may not be fully compatible without additional modifications.
6. **Higher Long-Term Costs** While the initial purchase price may be attractive, **repairs, recertifications, and eventual replacement** could become more expensive over time compared to newer, more efficient radios.
7. **No Built-in Audio Management** Unlike modern radios with **audio management units (AMUs)**, the VHF-251S may require additional wiring or interfacing with the aircraft s audio system, which could complicate installation.
---
### **Conclusion**
The **Collins Rockwell 622-3307-001 VHF-251S** is a **reliable, TSO-certified VHF communication radio** that remains a solid choice for **older aircraft, corporate jets, or operators who prioritize durability and compliance over cutting-edge features**. It is particularly well-suited for:
- **Aircraft where analog radios are already installed and working well.**
- **Operators on a budget who need a proven, low-maintenance comm radio.**
- **Vintage or restored aircraft where modern avionics upgrades are not feasible.**
However, if your aircraft is **new, being upgraded, or requires digital communication features**, a **newer VHF radio (e.g., Garmin GTX-330, Bendix/King KMA-25, or Honeywell Primus 1000)** would be a better long-term investment due to **better integration, digital capabilities, and future-proofing**.
---
### **Recommendation**
- **Buy the VHF-251S if:**- You need a **reliable, TSO-certified comm radio** for an older aircraft.
- You are **replacing a failing analog radio** and want a **proven, low-risk solution**.
- You **do not require digital features** and prefer a **simple, analog system**.
- **Avoid the VHF-251S if:**- Your aircraft is **being modernized** with glass cockpits or digital avionics.
- You need **DME, NAV integration, or ADS-B compatibility**.
- You want **long-term support and easier part availability** (consider a newer model).
- You are **operating in a fleet** where standardization on modern radios is preferred.
**Final Suggestion:**If possible, **test the unit before purchase** (especially if buying used) to ensure it functions correctly. Consider **pairing it with a modern audio management system** if your aircraft lacks one. For new installations or aircraft upgrades, **a newer VHF radio with digital capabilities** may be worth the investment despite a higher upfront cost.
Details:
Please See Pictures for Details. It features a digital frequency display when powered and manual tuning knobs. Note: Mounting tray, wiring harness, and antennas are NOT included. Collins VHF-251S Comm Transceiver Avionics Radio P/N 622-3307-001 TSO C-38b.
Up for sale is a vintage Collins VHF-251S Comm Transceiver. Whats Included: Collins VHF-251 Transceiver Unit as pictured. This Unit is untested and therefore designated as for Parts Only. 3.4 lbs, Dimensions 1.5 W x 3.512 L Approx.
part #: 6223307001 prices
- $75.00-$470.00
specifications comnavavioni:
- brand: Collins
- mpn: 622-3307-001
- part type: Transceiver Radio
- compatible model: Vhf-251s
- country of origin: United States
- serial number: 2037
offer comnavavioni:
- sold: 0
- started: February 20, 2026
- options: Ship-to-home
- quantity: 1
- availability: In Stock
- best offers: True
payments comnavavioni:
- wallet: Paypal
- credit card: Visa
- other
returns comnavavioni:
- policy: No Returns
shipping comnavavioni:
- type: Calculated
- cost: $27.58
- carrier: UPS
- service: UPS Ground Saver, UPS Ground, UPS Next Day Air Saver, UPS 2nd Day Air
- transit: 5-12 Days
- class: Economy, Standard, One-day, Expedited
general comnavavioni:
- Aviation Parts Accessories > Avionics > NAV/COMs
- condition: For parts or not working
seller comnavavioni:
- rating: 100.0%
- city: Arcadia, Florida
- # reviews: 1023
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