RUBBING OR BINDING IS FELT WHEN TUBEAXIAL FAN BLADES OR LEFT COOLING FAN BLADES ARE TURNED BY HAND AND THERE ARE METAL CHIPS IN THE OIL PUMP

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CONTINUED

3-2. TROUBLESHOOTING

k . POWER TURBINE AND REDUCTION

(4)

ES-43. RUBBING OR BINDING IS

GEARBOX (RGB) - CONTINUED

F E L T WHEN TUBEAXIAL FAN BLADES

O R LEFT COOLING FAN BLADES ARE

TURNED BY HAND AND THERE ARE

M E T A L CHIPS IN THE OIL PUMP TO

OIL COOLER FLUID FILTER.

This section contains troubleshooting to locate and correct the cause(s)

of rubbing or binding when the tubeaxial fan blades or left cooling fan

blades are turned by hand, and metal chips are found in the oil pump to

o i l c o o l e r f l u i d f i l t e r . The power turbine and RGB are coupled

mechanically through the power shaft. If there is damage to the power

t u r b i n e , rear engine subassembly position No 6A or 6B bearing, or RGB

bearings and/or gears, binding will be felt when the tubeaxial fan

blades or left cooling fan blades are turned by hand. Whenever metal

chips are generated, the fluid filter will catch most of the chips. It

can be assumed, f o r t h i s s y m p t o m , t h a t t h e m a g n e t i c p l u g o n e i t h e r t h e

accessory gearbox (AGB) or main oil pump has been wiped clean. Further

fault isolation is required to determine which module is faulty. The art

on the following pages provides an overview of the above described

system. Refer to these pages along with in-text art while performing

troubleshooting.

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