RUBBING OR BINDING IS FELT WHEN TUBEAXIAL FAN BLADES OR LEFT COOLING FAN BLADES ARE TURNED BY HAND AND MORE THAN ONE HALF OF ACCESSORY GEARBOX (AGB)

TM 9-2835-255-34

3-2. TROUBLESBOOTING - CONTINUED

k. POWER TURBINE AND REDUCTION

(2) ES-41. RUBBING OR BINDING IS

GEARBOX (RGB) - CONTINUED

FELT WHEN TUBEAXIAL FAN BLADES

OR LEFT COOLING FAN BLADES ARE

TURNED BY HAND AND MORE THAN ONE

HALF OF ACCESSORY GEARBOX (AGB)

MAGNETIC PLUG IS COVERED WITH

METAL CHIPS.

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

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

turned by hand and more than one half of the AGB magnetic plug is

c o v e r e d w i t h m e t a l c h i p s . 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, b i n d i n g w i l l b e f e l t w h e n t h e t u b e a x i a l f a n

blades or left cooling fan blades are turned by hand. The AGB acts as an

oil sump to collect oil scavenged from bearings in the forward engine

module and rear engine subassembly. The main oil pump pumps the hot oil

from the sump to the engine oil cooler. The art on the following pages

provides an overview of the systems described above. Refer to these

pages along with in-text art while performing troubleshooting.

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