HICKOK 6608401-13 Hydraulic Pressure Indicator Learjet 820-665

( Brand: Hickok ), ( Manufacturer Part Number: 6608401-13 ), ( Part Type: Hydraulic Pressure Indicator )

Review HICKOK Hydraulic Pressure Indicator Learjet

The **Hickok 6608401-13 820-665 Hydraulic Pressure Indicator** is a precision-engineered, aircraft-grade instrument designed specifically for the Learjet fleet, ensuring reliable performance in critical hydraulic system monitoring. This rugged yet highly accurate gauge is built to withstand the demanding conditions of high-altitude flight, providing pilots with real-time feedback on hydraulic pressure levels to maintain optimal system integrity. Featuring a robust, anodized aluminum case with a durable glass window, the indicator is engineered to resist corrosion, vibration, and temperature fluctuations, making it an indispensable component for both commercial and private aviation operations. The gauge incorporates a high-visibility, easy-to-read dial with clearly marked pressure scales, allowing for quick and precise assessments of hydraulic performance critical for ensuring safe takeoff, landing, and in-flight operations. Backed by Hickok s reputation for aerospace-grade reliability, this pressure indicator is meticulously calibrated to meet or exceed FAA and OEM specifications, offering pilots confidence in its accuracy and durability. Whether installed in a Learjet 23, 24, 25, or other compatible models, this hydraulic pressure indicator serves as a vital link between the aircraft s hydraulic system and the cockpit crew, ensuring operational efficiency and safety.

The **Hickok 6608401-13 820-665 Hydraulic Pressure Indicator** is a specialized component used in aircraft like the Learjet, particularly for monitoring hydraulic system pressure. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros of buying a Hickok 6608401-13 820-665 Hydraulic Pressure Indicator**

1. **OEM Quality and Reliability**

- Produced by Hickok, a well-established manufacturer of aircraft instrumentation, this gauge is designed to meet strict aviation industry standards. It is built to withstand the demanding conditions of aircraft hydraulic systems, ensuring long-term durability and consistent performance.

2. **Precision and Accuracy**

- The gauge is calibrated for hydraulic pressure monitoring, providing accurate readings critical for safe aircraft operation. This precision helps pilots and maintenance crews detect potential issues early, such as leaks or pressure fluctuations, before they become critical.

3. **Compatibility with Learjet Models**

- This specific part is designed for use in certain Learjet models (e.g., 23, 24, 25, 35, 36, 45, 55, and 60 series), ensuring a perfect fit and seamless integration with the aircraft s hydraulic system. Using an OEM or high-quality aftermarket part reduces the risk of compatibility issues.

4. **Easy Installation and Replacement**

- As a direct replacement part, it is designed to fit standard mounting brackets and wiring configurations found in the relevant Learjet models. This simplifies installation, reducing labor time and costs compared to custom or non-standard parts.

5. **Support for Maintenance and Compliance**

- Using an OEM or approved aftermarket part ensures compliance with FAA and manufacturer maintenance requirements. This is important for airworthiness certificates, inspections, and logbook entries, avoiding potential regulatory issues.

6. **Long Lifespan with Proper Maintenance**

- When installed correctly and maintained according to manufacturer guidelines, this gauge can last for decades, aligning with the operational lifespan of the aircraft. This reduces the need for frequent replacements and associated downtime.

7. **Warranty and Support**

- Hickok and authorized distributors often provide warranties or support for their products, offering recalibration, repair, or replacement if defects are found. This adds an extra layer of confidence in the purchase.

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### **Cons of buying a Hickok 6608401-13 820-665 Hydraulic Pressure Indicator**

1. **High Cost**

- As an OEM or high-quality aftermarket part, this gauge is significantly more expensive than generic or low-quality alternatives. The price can range from several hundred to over a thousand dollars, depending on the source and condition (new vs. used). This cost may be prohibitive for budget-conscious buyers or those not immediately needing replacement.

2. **Limited Availability of Used/Refurbished Units**

- While new units are widely available from Hickok or authorized dealers, finding a high-quality used or refurbished unit can be challenging. This limits options for cost savings, as buyers may have to rely on new parts or risk purchasing unreliable secondhand units from unverified sources.

3. **Specialized Knowledge Required for Installation**

- Installing a hydraulic pressure gauge requires familiarity with aircraft hydraulic systems, wiring, and instrument panel configurations. Improper installation can lead to incorrect readings, damage to the system, or even safety hazards. This may necessitate hiring a certified avionics technician, adding to the overall cost.

4. **Potential for Counterfeit or Low-Quality Parts**

- The aviation market has seen an increase in counterfeit or substandard parts, particularly from unscrupulous sellers. Buying from untrusted sources (e.g., eBay, Craigslist, or unknown online marketplaces) risks receiving a fake or defective gauge that fails during critical operations. Always purchase from reputable dealers with traceable histories.

5. **Maintenance and Calibration Requirements**

- Hydraulic pressure gauges require periodic calibration to ensure accuracy. This adds to the long-term cost of ownership, as it may require sending the gauge to a certified calibration facility or hiring a technician to perform the task. Neglecting calibration can lead to inaccurate readings and potential safety risks.

6. **Weight and Space Considerations**

- While not significant for most aircraft, the gauge adds a small amount of weight and occupies space in the instrument panel. In older or smaller aircraft, this may be a minor but noteworthy factor, especially if multiple instruments are being replaced or upgraded.

7. **Depreciation Over Time**

- Like all aircraft parts, the value of this gauge depreciates over time. If the aircraft is sold or retired, the gauge may not recoup its cost, making it a consumable rather than a long-term investment.

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### **Conclusion**

The **Hickok 6608401-13 820-665 Hydraulic Pressure Indicator** is a high-quality, reliable, and critical component for Learjet hydraulic systems. Its advantages such as precision, compatibility, and compliance with aviation standards make it an ideal choice for maintaining airworthiness and safety. However, the high cost, potential for counterfeit parts, and specialized installation requirements present challenges, particularly for owners operating on tight budgets or without access to professional avionics support.

For most aircraft owners, the benefits of using an OEM or high-quality aftermarket gauge far outweigh the drawbacks, especially when considering the safety and operational integrity of the aircraft. The risk of using a low-quality or counterfeit part is not worth the cost savings, as it could lead to catastrophic failures.

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### **Recommendation**

- Buy the gauge directly from Hickok or an authorized distributor (e.g., Aircraft Spruce, Aviation Supplies & Academics, or a trusted local avionics shop). Avoid purchasing from unverified sellers to avoid counterfeit parts.

- If budget is a concern, explore new units from Hickok or certified refurbished units from trusted suppliers. Ensure any used gauge has a complete service history and has been professionally inspected.

- Do not attempt installation unless you have extensive experience with aircraft hydraulic systems. A certified avionics or maintenance technician should handle the installation to ensure proper wiring, sealing, and calibration.

- Budget for periodic calibration and potential repairs. Include these costs in your long-term maintenance planning to avoid unexpected expenses.

- While the upfront cost is high, the safety and reliability of the gauge justify the investment. Cheap alternatives may seem attractive, but they pose significant risks to the aircraft s operation and the safety of its occupants.

- Ensure the seller offers a warranty or return policy in case the gauge is defective. This provides peace of mind and recourse if issues arise post-purchase.

**Final Verdict:** For Learjet owners, the **Hickok 6608401-13 820-665 Hydraulic Pressure Indicator** is the recommended choice due to its reliability, accuracy, and compliance with aviation standards. The investment is justified by the critical role this gauge plays in ensuring safe and efficient aircraft operation. Always prioritize quality and professional installation to maximize the gauge s lifespan and performance.

Details:

Hickok 820-665 Hydraulic Pressure Indicator Learjet 6608401-13, Please see photos for details. Free shipping only applies to the 48 contiguous states.

part #: 660840113 prices

• $499.99-$500.00

specifications engineaviatio:

• brand: Hickok
• mpn: 6608401-13
• part type: Hydraulic Pressure Indicator

offer engineaviatio:

• started: April 17, 2026
• sold: 0
• options: Ship-to-home
• quantity: 1
• availability: In Stock

returns engineaviatio:

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

shipping engineaviatio:

• class: Standard
• transit: 5-11 Days
• type: Fixed
• service: Standard
• cost: $0.00

general engineaviatio:

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

seller engineaviatio:

• city: Anaheim, California
• rating: 99.8%
• # reviews: 27035

payments engineaviatio:

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

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