12-40 Fuel System
WARNING
Refer to appropriate Material Safety Data Sheet (MSDS) and
take necessary safety precautions when working in proximity to
hazardous materials.
WARNING
Always fuel helicopter in a well-ventilated area. No smoking
within 100 feet of aircraft during fueling.
12-41 Fueling
1. Turn BATTERY switch OFF.
2. Ground helicopter and ground fuel vehicle. Open fueling cowl door and connect fuel
vehicle ground cable to helicopter at location identified by decal.
3. Verify proper grade of aviation fuel. See R66 Pilot's Operating Handbook (POH) Section
2 for approved fuel grades and instructions for use of anti-ice additive.
4. Remove fuel cap and fuel helicopter as required.
5. Install fuel cap, remove grounding equipment, and close cowl door.
12-42 Defueling
Refer to R66 Illustrated Parts Catalog (IPC) Figure 28-9.
1. Remove engine cowling per Section 53-21.
2. Turn BATTERY switch OFF. Pull fuel valve control OFF.
3. Disconnect B283-12 hose at F670-1 valve, raise hose vertically, and plug hose inlet.
4. Fabricate drain hose (3 feet clear tubing with fitting) and connect to valve outlet. Position
drain hose overboard into a suitable, grounded drain container.
NOTE
If desired, perform low-fuel switch assembly check per Section
28-22.
5. Push fuel valve control ON and drain fuel; drain residual fuel via sump valve. Pull fuel
valve control OFF. Perform maintenance tasks as required.
6. Add minimum 5 gallons fuel per Section 12-41. Push fuel valve control ON until fuel
flows thru drain hose without bubbles. Pull fuel valve control OFF.
7. Connect B283-12 hose, special torque hose nut per Section 20-33, and torque stripe
per Figure 5-1.
8. Defuel engine as required per RR300 Series Operation and Maintenance Manual (OMM).
SEP 2012 R66 Maintenance Manual Chapter 12 Servicing Page 12.13
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