CHAPTER 5
INSPECTIONS
5-10 Introduction
The R66 helicopter must be inspected periodically to verify it is in airworthy condition.
Required inspection intervals are maximum 100 hours time in service or 12 calendar
months (annually), whichever occurs first; the inspection interval may be extended up to
10 hours, without accumulation, if allowed by local regulations. Fluid leaks, discoloration,
dents, scratches, nicks, cracks, galling, chafing, fretting, and corrosion all warrant further
investigation. Unairworthy items must be replaced or repaired as allowed by Robinson
Helicopter Company. This section contains procedures for performing the required periodic
airframe inspections.
5-20 [Reserved]
5-30 General Procedures
Unless otherwise specified, the following general procedures apply to R66 inspection. When
required, magnetic particle inspection may be performed in accordance with ASTM E 1444
and MIL-STD-1907. Fluorescent penetrant inspection may be performed in accordance
with ASTM E 1417 and MIL-STD-1907.
5-31 Ball and Roller Bearings
The first indication of bearing failure is usually an increase in bearing noise. Noise will
almost always start several hours prior to bearing failure. Listen to drive system during
start-up and shutdown. A failing bearing will produce a loud whine, rumble, growl,
or siren sound. Upon hearing an unusual noise, thoroughly inspect all bearings before
further flight.
A failing bearing may have a distorted seal or be exuding a large amount of grease.
Monitor bearings for increase in temperature, but do not rely on Telatemps to detect failing
bearings as temperature increase may occur only seconds before bearing disintegrates.
JUL 2020 Chapter 5 Inspections Page 5.1
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