PIPER 687-277 Alt Gauge Ammeter PA-34 6246-00065 5-90471

( Manufacturer Part Number: 687-277 ), ( Part Type: Gauge ), ( Compatible Model: 6246-00065, 5-90471 ), ( Country Of Origin: United States )

Review PIPER Part Alt# Face Gauge Ammeter

The **Piper 687-277 PA-34 Seneca II Altitude Gauge (Part Number 6246-00065) and 5-90471 Gauge Ammeter** is a meticulously engineered pair of critical flight instruments designed to enhance the operational reliability and safety of the Piper PA-34 Seneca II, a versatile and widely used twin-engine aircraft. The **altitude gauge (6246-00065)** is a precision-engineered pressure-driven instrument that provides pilots with real-time altitude information, essential for navigation, terrain clearance, and adherence to flight levels. Constructed with a durable anodized aluminum case, it features a robust, easy-to-read dial marked with standard aviation altitude markings, including thousands of feet increments and a clear, high-contrast pointer for quick visual reference. The gauge incorporates a sealed, nitrogen-filled capsule mechanism that ensures accuracy and longevity, even under varying atmospheric conditions. Its mounting flange is designed to integrate seamlessly with the aircraft s instrument panel, allowing for a secure and flush installation that minimizes air turbulence interference.

Complementing the altitude gauge is the **5-90471 gauge ammeter**, a vital component for monitoring the electrical system s health during flight. This instrument measures the flow of electrical current in the aircraft s charging system, providing critical feedback on the alternator s performance and battery charging status. The ammeter features a dual-range scale one for charging current (in amperes) and another for discharging current allowing pilots to assess whether the electrical system is properly balanced or if there are potential issues such as overcharging, undercharging, or parasitic drain. The gauge is housed in a similarly durable aluminum casing, with a clear, backlit display and a sturdy needle mechanism that ensures visibility even in low-light conditions. Like the altitude gauge, it is designed for straightforward installation, with a compatible mounting interface that aligns with the aircraft s electrical panel layout.

Together, these two instruments form an indispensable part of the PA-34 Seneca II s flight deck, offering pilots the precision and reliability needed for safe and efficient operations. Whether navigating through varying altitudes or ensuring the aircraft s electrical system remains in optimal condition, these gauges provide the clarity and confidence required for every phase of flight. Ideal for both new installations and replacements, they adhere to strict aviation standards, ensuring compatibility with the aircraft s existing systems while delivering the performance expected from Piper s legacy of aviation excellence.

### **Pros and Cons of Buying a Piper PA-34 Seneca (Model 687-277, Serial PA-34-624600065, 5-90471 Gauge Ammeter)**

#### **Pros**

1. **Reliable and Well-Built Aircraft**

The Piper PA-34 Seneca is a four-seat, high-wing, twin-engine aircraft known for its robustness and durability. It was designed with redundancy in mind, featuring two engines, dual controls, and a robust airframe that has proven reliable over decades of service.

2. **Strong Resale Value**

The Seneca holds its value better than many general aviation aircraft due to its reputation for reliability and the relatively high number of active units still in service. This makes it a practical choice for buyers looking for long-term ownership.

3. **Redundant Systems**

The twin-engine configuration provides redundancy, which is critical for safety, especially in VFR conditions or when flying into areas with potential weather challenges. The dual controls also make it a good choice for training or shared ownership.

4. **Moderate Operating Costs**

While not as fuel-efficient as some single-engine aircraft, the Seneca s twin-engine setup avoids the risk of engine failure, which can be costly in terms of repairs or downtime. Maintenance costs are generally manageable, especially if the aircraft is well-maintained.

5. **Comfortable and Spacious Cabin**

The Seneca offers a comfortable ride with good visibility and a spacious cabin, making it suitable for short to medium-haul flights, passenger transport, or even light charter work.

6. **Widely Available Parts and Support**

As a well-established model, parts for the Seneca are readily available, and there is a large network of mechanics and dealerships familiar with its systems. This reduces the risk of extended downtime due to part shortages.

7. **Good Performance for Its Class**

The Seneca has a cruising speed of around 170 180 knots and a service ceiling of approximately 20,000 feet, making it capable of crossing state lines or flying into higher-altitude airports without significant performance penalties.

8. **Potential for Modifications**

Owners can upgrade systems (e.g., avionics, engines, or avionics) to improve performance, safety, or comfort. The aircraft s design allows for modifications that can extend its useful life.

---

#### **Cons**

1. **Higher Purchase Price**

The Seneca is more expensive to buy than many single-engine aircraft, reflecting its twin-engine configuration and the additional complexity it introduces. The price can vary widely depending on age, hours, and condition, but even a well-maintained example will cost significantly more than a comparable single-engine plane.

2. **Higher Operating Costs**

- **Fuel consumption**: Twin-engine aircraft burn more fuel, increasing operational expenses.

- **Insurance**: Insurance premiums are typically higher for multi-engine aircraft.

- **Maintenance**: Dual-engine systems require more frequent inspections and potential repairs, adding to the cost of ownership.

3. **Complexity and Maintenance Requirements**

The Seneca s twin-engine setup means more components to monitor, maintain, and repair. This can lead to higher maintenance costs and the need for more frequent checkups compared to single-engine aircraft. Owners must be prepared for the added complexity of managing two engines, avionics, and other systems.

4. **Lower Fuel Efficiency**

The Seneca s fuel burn is significantly higher than that of single-engine aircraft. For example, it may consume around 12 15 gallons per hour (GPH) compared to 8 10 GPH for a typical single-engine plane. This can be a major drawback for owners who frequently fly long distances or operate on a tight budget.

5. **Potential for Uneven Engine Performance**

If the two engines are not well-matched or if one engine develops issues, it can lead to performance discrepancies (e.g., one engine running richer or leaner than the other). This requires careful monitoring and tuning to maintain balanced operation.

6. **Depreciation Over Time**

While the Seneca holds its value better than many GA aircraft, it still depreciates. Older models may see a steeper decline in value unless they are well-maintained or have been recently upgraded with modern avionics or engines.

7. **Limited High-Altitude Performance**

While the Seneca can climb to 20,000 feet, its performance at higher altitudes is not as impressive as some modern twin-engine aircraft. This may limit its utility for long cross-country flights or operations into high-altitude airports without precooling or other modifications.

8. **Noise and Vibration**

The Seneca s twin Lycoming engines (depending on the model) can be noisy and may transmit more vibration into the cabin compared to quieter modern aircraft. This can affect passenger comfort, especially on longer flights.

9. **Avionics and Technology Limitations**

Many Senecas still fly with older analog or basic glass-cockpit systems. While upgrades are possible, the cost and complexity of retrofitting modern avionics (e.g., Garmin G3000, Avidyne) can be significant. This may limit the aircraft s appeal to owners who prioritize cutting-edge technology.

10. **Regulatory and Compliance Costs**

Twin-engine aircraft often face stricter regulatory requirements, such as more frequent inspections (e.g., 100-hour or annual checks) and adherence to specific maintenance protocols. This can add to the administrative and financial burden of ownership.

---

### **Ending Conclusion**

The Piper PA-34 Seneca is a capable, reliable, and well-regarded twin-engine aircraft that excels in safety, redundancy, and comfort. It is an excellent choice for pilots who prioritize dual-engine redundancy, a spacious cabin, and a robust airframe. The Seneca is particularly suited for owners who:

- Fly frequently but not excessively long distances.

- Value safety and redundancy over fuel efficiency.

- Are prepared for higher operating costs and maintenance responsibilities.

- Prefer a proven, time-tested design with a strong support network.

However, the Seneca is not ideal for budget-conscious buyers or those who prioritize fuel efficiency, modern avionics, or high-altitude performance. Its higher purchase price, operating costs, and maintenance requirements make it less attractive compared to single-engine aircraft or newer twin-engine models (e.g., Cirrus SR22, Beechcraft King Air).

### **Recommendation**

- You are a pilot who values redundancy and safety above all else.

- You plan to use the aircraft for short to medium-haul flights, passenger transport, or light charter work.

- You are financially prepared for the higher costs associated with twin-engine ownership.

- You prefer a well-established, reliable aircraft with a strong parts and support network.

- You are willing to invest in maintenance and potential upgrades to keep the aircraft airworthy and comfortable.

- You are operating on a tight budget and cannot afford the higher fuel, insurance, and maintenance costs.

- You prioritize fuel efficiency and plan to fly long distances frequently.

- You are looking for modern avionics or a quieter, more advanced aircraft.

- You are a beginner pilot or do not have experience with twin-engine aircraft, as the added complexity may be overwhelming.

- You prefer the lower purchase price and simplicity of a single-engine aircraft.

Before purchasing, thoroughly inspect the aircraft s maintenance records, engine hours, and overall condition. Consider having a pre-purchase inspection (PPI) performed by an experienced aviation mechanic. If possible, test fly the aircraft to ensure it meets your performance and comfort expectations. Additionally, factor in the cost of potential upgrades (e.g., avionics, engines) to extend the aircraft s useful life and enhance your flying experience.

Details:

Note: Buyer or their representative is to determine if the item airworthy/applicable and comply with all applicable Farsi when installing part on the aircraft. Any is for the sole purpose of identifying an item. Currently 1900 items and growing daily. .

Airworthiness is ONLY determined by the FAA approved mechanic or certified repair station item to be installed.

part #: 687277 prices

• $345.00-$620.00

specifications engineaviatio:

• for makes: Piper
• mpn: 687-277
• part type: Gauge
• compatible model: 6246-00065, 5-90471
• country of origin: United States

seller engineaviatio:

• rating: 100.0%
• city: Maple Valley, Washington
• # reviews: 1845

offer engineaviatio:

• quantity: 1
• best offers: True
• availability: In Stock
• options: Ship-to-home
• started: March 26, 2026
• sold: 0

returns engineaviatio:

• paid by: Buyer
• policy: Returns Accepted
• time: 30 Days

shipping engineaviatio:

• type: Fixed
• carrier: USPS, UPS
• cost: $12.97
• class: Expedited, One-day
• service: USPS Priority Mail Padded Flat Rate Envelope, USPS Priority Mail Express Flat Rate Envelope, UPS Next Day Air
• transit: 4-9 Days

general engineaviatio:

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

payments engineaviatio:

• other
• credit card: Visa
• wallet: Paypal

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