Robinsons R66 - 12-22 Chip Detector and Sight Gage; 12-23 Drain and Flush

12-22 Chip Detector and Sight Gage
A. Removal
1. Drain tail rotor gearbox oil per Section 12-21.
2. Remove sight gage, as required.
B. Cleaning Chip Detector
1. Clean chip detector per Section 12-13 Part B (main rotor gearbox).
C. Installation
1. Refer to Figure 12-3. Verify cleanliness and clarity of sight gage. As required,
remove sight gage per Part A and clean with approved solvent per Section 20-70.
Install sight gage and special torque per Section 20-33.
2. Verify cleanliness of chip detector. As required, clean chip detector per Section 12-
13 Part B (main rotor gearbox). Install chip detector and special torque per Section
20-33.
3. Connect chip detector wiring and install ty-raps, as required. Cinch ty-raps until
snug without over-tightening, and trim tips flush with heads.
4. Turn BATTERY switch ON. Verify TR CHIP warning segment illuminates when test
button is depressed. Turn BATTERY switch OFF.
5. Service tail rotor gearbox per Section 12-21.
12-23 Drain and Flush
1. Drain tail rotor gearbox oil per Section 12-21.
2. Install chip detector and special torque per Section 20-33.
3. Remove filler-vent plug and add approximately five ounces of SAE30, SAE40, SAE50,
or SAE20W50 straight mineral engine oil to gearbox. Install plug and special torque per
Section 20-33.
4. Run-up helicopter approximately five minutes at 60-70% RPM per R66 Pilot's Operating
Handbook (POH) Section 4.
5. Drain tail rotor gearbox oil (mineral oil) per Section 12-21.
6. Clean and install chip detector per Section 12-22 Parts B and C.
Page 12.8 Chapter 12 Servicing R66 Maintenance Manual SEP 2012