SERVICE LETTER
VASHON RANGER R7 · Service Bulletins
Overview
This service letter provides instructions for adjusting the oil cooler on the Vashon Ranger R7 aircraft for optimal performance in cold weather conditions. It outlines a method to restrict airflow through the oil cooler to achieve desired oil temperatures.
- Applicable to all Ranger R7 aircraft.
- Focuses on oil cooler adjustment for cold weather operation.
- Requires approximately 0.5 hours of maintenance.
- Pilot/Operator certification is the minimum required.
- Oil temperature should be maintained between 180°F and 200°F.
- Speed tape is recommended for covering the oil cooler.
- Results may vary based on environmental factors.
- Experimentation may be necessary for optimal results.
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Reference only, not for flight. Use the current approved manual for your aircraft. See terms, section 5.
Document
Source
Copy found at vashonaircraft.com. Sprinkle hosts a reference copy with an added summary, specifications and searchable full text.
Document details
- Type ·
- Service Bulletins
- Year ·
- 2026
- File size ·
- 410 KB
- Copy found at ·
- vashonaircraft.com
- Language ·
- en
Specifications & performance
Extracted from this document.
Performance
- Optimal oil temperature range ·
- 180°F - 200°F
What is the SERVICE LETTER?
The SERVICE LETTER is a service bulletins for the VASHON RANGER R7, dated 2026.
What year was the SERVICE LETTER published?
The SERVICE LETTER — the VASHON RANGER R7 service bulletins on file — is dated 2026.
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- Pilot's Operating Handbook / AFM
- Checklist
- Maintenance Manual
- Parts Catalog (IPC)
- Systems & Wiring
- Service Bulletins on file
- Type Certificate (TCDS)
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In this document
Purpose
The document addresses challenges in achieving optimal oil temperatures in cold climates due to excess cooling capacity of the oil cooler.
Instructions
Step-by-step instructions are provided for removing the cowl, locating the oil cooler, and applying speed tape to restrict airflow.
Expected Operating Temperatures
Table 1 outlines the percentage of oil cooler surface area to cover based on expected operating temperatures.
Maintenance Type
The maintenance required is classified as low.
Labor Required
Approximately 0.5 hours of labor is needed for the adjustment.
Note
The method has been tested, but results may vary, and operators may need to experiment for best results.
Summary written by AI from the source document. Check the original before relying on it. See which parts of Sprinkle are written by AI.
Safety notes
- Be aware that results will vary depending on environmental factors.
- Experimentation may be required to obtain the best results.
Summary written by AI from the source document. Check the original before relying on it. See which parts of Sprinkle are written by AI.
Full document text
SERVICE LETTER VASHON AIRCRAFT 14929 141st PL NE Woodinville, WA 98072 425.527.9944 SL-02-12-26-1 REV A.DOCX SUPPORT@VASHONAIRCRAFT.COM Page 1 of 2 SL-02-12-26-1 Rev A DATE RELEASED 02-12-2026 DATE EFFECTIVE 02-12-2026 SUBJECT Oil Cooler Adjustment for Cold Weather Operation EFFECTIVITY MODEL- Ranger R7 SERIAL NO: ALL AIRCRAFT PURPOSE In cold climates it may be challenging to obtain optimal oil temperatures due to the excess cooling capacity of the oil cooler. This document stipulates a permissible method of restricting air flow through the oil cooler to increase oil temperatures. TYPE OF MAINTENANCE Low. MINIMUM LEVEL OF CERTIFICATION Pilot / Operator. LABOR REQUIRED: Approximately 0.5 hour. INSTRUCTIONS 1. Remove the top cowl of the aircraft in accordance with section 5.7.9 of the maintenance manual. 2. Locate the oil cooler on the top left of the engine/baffle assembly. 3. Reference Table 1 for applicable coverage of the oil cooler in relation to the expected operating temperatures: Expected Operating Temperature: Percentage of Oil Cooler Surface Area to Cover < 0°F 67% 0°F – 20°F 50% 20°F – 50°F 33% > 50°F N/A Table 1. SERVICE LETTER VASHON AIRCRAFT 14929 141st PL NE Woodinville, WA 98072 425.527.9944 SL-02-12-26-1 REV A.DOCX SUPPORT@VASHONAIRCRAFT.COM Page 2 of 2 4. Apply speed tape (such as 3M Mfr#7100053741) in a vertical direction to cover the applicable oil cooler surface area. Reference Figure 1 for a typical installation. 5. Reinstall cowl in accordance with 5.7.9 of the maintenance manual. Note: This method has been tested and shown to provide good results. Be aware that results will vary depending on environmental factors and use case. Experimentation may be required by the operator to obtain the best results. A healthy steady state oil temperature should be between 180°F – 200°F. Adjust as necessary. Figure 1.