5-69 Main Rotor Gearbox (MR) Chip Light Illumination
If the MR CHIP annunciator segment illuminates:
1. Remove main rotor gearbox chip detector per § 12-13. Inspect any particles found on
the chip detector. Examine the particles and perform following appropriate corrective
action:
a. For fuzz particles: Clean chip detector with compressed air or toothbrush (do not
use magnet) and reinstall per § 12-13. Normal wear, especially new gearboxes,
will produce fine fuzz.
b. For flake particles or slivers longer than 0.12 inch or wider than 0.02 inch: Clean
chip detector. Replace gearbox filter per § 12-12. Visually examine old filter with
10X magnification; return gearbox to RHC if metallic debris is detected.
c. For large ferrous chips or chunky particles: Remove gearbox per § 63-20 and
return to RHC. Return chips and/or particles if possible.
5-70 Tail Rotor Gearbox (TR) Chip Light Illumination
If the TR CHIP annunciator segment illuminates:
1. Drain the gearbox per § 12-21, straining the oil through a 190-micron (or finer) paint
filter into a clean container.
2. Inspect any particles found in the paint filter or on the chip detector. Examine the
particles for size; any particles larger (0.09 inch long or 0.02 inch wide) than fine fuzz
(normal wear) should be identified as ferrous or non-ferrous by using a magnet. If
particles are ferrous, remove tail rotor gearbox per § 65-40 and return it to RHC.
5-71 Main Rotor Gearbox Filter Bypass Indicator
NOTE
Extremely cold temperatures may cause the bypass to activate.
If the main rotor gearbox filter bypass indicator button continues to activate after two
consecutive resets (at operating temperature), perform the following:
1. Service filter per § 12-12. Examine filter for particles.
a. If filter is clean, replace bypass indicator.
b. If filter is contaminated, return main rotor gearbox to RHC for overhaul, replace
main rotor gearbox oil cooler and flush oil lines.
MAY 2015 Chapter 5 Inspections Page 5.49
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