ENGINE - Introduction of Accessory Gearbox Assembly Axis-A Oil Slinger Nut

GE PROPRIETARY INFORMATION

The information contained in this document is GE proprietary information and is disclosed in

confidence. It is the property of GE and shall not be used, disclosed to others or reproduced

without the express written consent of GE, including, but without limitation, it is not to be used

in the creation, manufacture, development, or derivation of any repairs, modifications, spare

parts, designs, or configuration changes or to obtain FAA or any other government or regulatory

approval to do so. If consent is given for reproduction in whole or in part, this notice and the

notice set forth on each page of this document shall appear in any such reproduction in whole

or in part.

This technical data is considered EAR controlled pursuant to 15 CFR Parts 730-774 respectively.

Transfer of this data by any means to a Non-US Person, whether in the United States or

abroad, without the proper U.S. Government authorization (e.g., License, exemption, NLR, etc.),

is strictly prohibited.

Copyright (2011) General Electric Company, U.S.A.

TRANSMITTAL INFORMATION

REVISION 1 TO SERVICE BULLETIN 72-0033

Revision 1 is issued to add a Note to clarify the procedure for torquing the oil slinger nut.

The basic Service Bulletin was issued February 11, 2011. Revision bars in the left margin identify

changes.

February 11, 2011 CT7-8 S/B 72-0033

Revision 01, April 28, 2011 PAGE 1 of 15
ENGINE - Introduction of Accessory Gearbox Assembly Axis-A Oil Slinger Nut

1. PLANNING INFORMATION

A. Effectivity

CT7-8/-8A/-8A1/-8A5/-8B/-8B5/-8E/-8E5/-8F/-8F5

This Service Bulletin is applicable to all CT7-8/-8A/-8A1/-8A5/-8B/-8B5/-8E/-8E5/

-8F/-8F5 engine models including:

. CT7-8A engines, serial numbers 947565 and below.

. CT7-8A1 engines, serial numbers 530017 and below.

. CT7-8E engines, serial numbers 953068 and below, and 953070 through 953072. . CT7-8F5 engines, serial numbers 731005 and below, 731007, 731008, 817021,

and 817022.

This Service Bulletin has been introduced in production to these CT7

turboshaft engines:

. CT7-8A engines, serial numbers 947566 and up.

. CT7-8A1 engines, serial numbers 530018 and up.

. CT7-8E engines, serial numbers 953069, 953073 and up. . CT7-8F5 engines, serial numbers 731006, 731009 and up.

These serial numbers are the best available data.

B. Description

This Service Bulletin provides instructions to install an oil slinger nut PN

5159T33G01 onto the axis-A shaft of the accessory gearbox assembly. The oil

slinger nut will prevent excessive amounts of oil from draining into the A-sump

during sustained aircraft left rolls while in hover or uncoordinated flight.

C. Compliance

Category 4

GE recommends that you comply with this Service Bulletin at next exposure of the

axis-A shaft.

Operators should contact their Customer Service Manager for assistance with

scheduling all required installations in each fleet based on whole fleet demand.

NOTE: This Service Bulletin can be accomplished on-wing.

D. Concurrent Requirements

None.

February 11, 2011 CT7-8 S/B 72-0033

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GE PROPRIETARY INFORMATION - Subject to the restrictions on the cover or first page.
ENGINE - Introduction of Accessory Gearbox Assembly Axis-A Oil Slinger Nut

E. Reason

(1) Objective:

To install gearbox axis-A oil slinger nut PN 5159T33G01.

(2) Condition:

The CT7-8 engine family has experienced several occasions of A-sump

flooding that had resulted in engine stalls. If this occurs, there is a potential

that the engine may not recover.

(3) Cause:

Excess oil may drain into the A-sump, exceeding the scavenge capability of

the engine.

(4) Improvement:

Installation of the axis-A oil slinger reduces oil flow into the A-sump to a level

that is within the capacity of the scavenge system while continuing to provide

adequate bearing lubrication and chip detection.

(5) Substantiation:

Substantiation was accomplished by analysis and engine AGB testing.

F. Approval

This Service Bulletin has been reviewed by the FAA and the repair(s) and

modification(s) herein comply with the applicable Federal Aviation Regulations and

are FAA APPROVED for installation in the model(s) listed in this Service Bulletin.

G. Manpower

For operators, approximately 1 hour is required to install the oil slinger nut.

H. Weight and Balance

Weight and balance are not changed.

February 11, 2011 CT7-8 S/B 72-0033

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GE PROPRIETARY INFORMATION - Subject to the restrictions on the cover or first page.
ENGINE - Introduction of Accessory Gearbox Assembly Axis-A Oil Slinger Nut

I. References

GEK 105159, CT7-8 Maintenance Manual (MM)

CT7-8 S/B 79-0004, Approved Oils

GEK 105158, CT7-8 Illustrated Parts Catalog

NOTE: The reference documents listed below are for the engine manufacturer's

internal use only.

CID: MCTF354

J. Publications Affected

GEK 105158, CT7-8 Illustrated Parts Catalog

GEK 105175, CT7-8 Shop Manual

CT7-8 Turboshaft Engine Service Record

K. Interchangeability

Gearbox axis-A oil slinger nut PN 5159T33G01 is added to the engine configuration

of the affected models.

L. Software Accomplishment Summary

Not applicable.

2. MATERIAL INFORMATION

A. Material - Price and Availability

(1) Parts necessary to do this Service Bulletin:

Part Number

Qty/

Eng Part Name

U.S. Dollar

($)

Pkg

Qty

Lead

Time

Weeks

5159T33G01 (1) Nut, Gearbox Axis-A Oil

Slinger

-- (1) --

NOTE: Procure parts from normal sources.

February 11, 2011 CT7-8 S/B 72-0033

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ENGINE - Introduction of Accessory Gearbox Assembly Axis-A Oil Slinger Nut

(2) Other Spare Parts:

Part Number

Qty/

Eng Part Name

U.S. Dollar

($)

Pkg

Qty

Lead

Time

Weeks

J221P009 (1) Packing, Preformed -- (1) --

J221P012 (1) Packing, Preformed -- (1) --

J221P150 (1) Packing, Preformed -- (1) --

NOTE: Procure parts from normal sources.

(3) Consumables:

Code Number Description

C02-007 Assembly Fluid, Ultrachem No. 1

C02-023 Oil, Engine Lubricating (MIL-PRF-23699)*

C10-140 Gloves, Rubber or Film Latex or Nylon/Polyethylene

C10-154 Beeswax

-- Bag, Plastic

-- Oil, Engine Lubricating (MIL-PRF-7808)*

*Only use approved oils. Refer to CT7-8 S/B 79-0004.

B. Industry Support Information

None.

C. Configuration Chart

New

Part Number

Qty/

Eng Part Name

Old

Part Number/

IPC Location

Qty/

Eng

Op

Code

Chg/

Sprt

Code

3062T20G09 (1) Gearbox Assy,

Accessory Drive

(SIN 29A00)

3062T20G06

72-60-00-01-270

72-61-00-01-001

(1) RW 2/A

. 5159T33G01 (1) Nut, Gearbox

Axis-A Oil Slinger

(SIN 03330)

-- (-) AD 5/-

. 5158T79P01 (ALT) Nut, Gearbox

Axis-A Oil Slinger

(SIN 03330)

-- (-) AD 5/-

February 11, 2011 CT7-8 S/B 72-0033

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ENGINE - Introduction of Accessory Gearbox Assembly Axis-A Oil Slinger Nut

New

Part Number

Qty/

Eng Part Name

Old

Part Number/

IPC Location

Qty/

Eng

Op

Code

Chg/

Sprt

Code

3062T20G10 (1) Gearbox Assy,

Accessory Drive

(SIN 29A00)

3062T20G08

72-60-00-01-270

72-61-00-01-001

(1) RW 2/A

. 5159T33G01 (1) Nut, Gearbox

Axis-A Oil Slinger

(SIN 03330)

-- (-) AD 5/-

. 5158T79P01 (ALT) Nut, Gearbox

Axis-A Oil Slinger

(SIN 03330)

-- (-) AD 5/-

4181T10G04 (1) Gearbox Assy,

Accessory Drive

(SIN 29A00)

4181T10G02

72-60-00-01-270

72-61-00-01-001

(1) RW 2/A

. 5159T33G01 (1) Nut, Gearbox

Axis-A Oil Slinger

(SIN 03330)

-- (-) AD 5/-

. 5158T79P01 (ALT) Nut, Gearbox

Axis-A Oil Slinger

(SIN 03330)

-- (-) AD 5/-

Operation Codes

AD = Add

RW = Rework

Change Codes

2 = Two way interchangeable

5 = Qualified interchangeability. Refer to paragraph 1.K., Interchangeability.

Support Codes

A = Old parts will no longer be supplied

D. Parts Disposition

Discard old parts.

E. Tooling - Price and Availability

Part Number Nomenclature

4096620-296 Puller, Axis-A Shaft

BD 001 Fixture, Slinger Torquing

February 11, 2011 CT7-8 S/B 72-0033

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ENGINE - Introduction of Accessory Gearbox Assembly Axis-A Oil Slinger Nut

3. ACCOMPLISHMENT INSTRUCTIONS

A. Removal of Axis-A Shaft Assembly

(1) Remove the axis-A cover assembly (01-170) as follows (refer to Figure 1):

(a) Carefully remove the axis-A boot (01-300, 72-60-00).

(b) Remove the axis-A retaining ring (01-165) and the axis-A cover

assembly (01-170).

(2) Remove the axis-A lube nozzle (01-160) as follows:

WARNING: ULTRACHEM NO. 1 ASSEMBLY FLUID

. CONTACT WITH EYES/FACE/SKIN MAY CAUSE

IRRITATION OR BURNING.

. PERSONAL PROTECTIVE EQUIPMENT REQUIRED WHEN

HANDLING OR USING THIS MATERIAL.

. MAY LEAD TO ALLERGIC SENSITIVITY IN SOME

INDIVIDUALS.

(a) Remove the self-locking nut (01-105) (7/32 inch wrench size) and the

washer (01-120) that attach the axis-A lube nozzle (01-160) to accessory

drive gearbox assembly (01-270, 72-60-00). Use a small amount of

Ultrachem No. 1 Assembly Fluid or beeswax on wrench socket to help

capture the nut and prevent it from falling out of the socket.

(b) Pull the axis-A lube nozzle (01-160) out of accessory drive gearbox

assembly (01-270, 72-60-00).

(c) Remove and discard the preformed packings (01-085) and (01-155)

from the axis-A lube nozzle (01-160).

(3) Remove axis-A shaft assembly retaining nuts (01-140) as follows:

CAUTION: . EXTREME CARE MUST BE USED TO PREVENT THE

SELF-LOCKING NUTS FROM FALLING INTO THE AGB. IF

THIS OCCURS, THE ENGINE MUST BE RETURNED TO

OVERHAUL TO RETRIEVE THE NUT.

. DO NOT REMOVE THE RADIAL DRIVE SHAFT UNTIL THE

THREE SELF-LOCKING NUTS HAVE BEEN REMOVED.

THIS WILL PREVENT THE NUTS FROM FALLING

THROUGH THE CENTER OF THE SHAFT INTO THE

ENGINE.

(a) Install large cap plug (part of axis-A shaft puller 4096620-296) onto

flange groove on accessory drive gearbox assembly (01-270, 72-60-00)

(Refer to Figure 1).

February 11, 2011 CT7-8 S/B 72-0033

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ENGINE - Introduction of Accessory Gearbox Assembly Axis-A Oil Slinger Nut

(b) Install the small cap plug (part of axis-A shaft puller 4096620-296) over

the axis-A bearing retainer (01-185) positioning the three cutouts over

the three nuts (01-140).

WARNING: ULTRACHEM NO. 1 ASSEMBLY FLUID

. CONTACT WITH EYES/FACE/SKIN MAY CAUSE

IRRITATION OR BURNING.

. PERSONAL PROTECTIVE EQUIPMENT REQUIRED WHEN

HANDLING OR USING THIS MATERIAL.

. MAY LEAD TO ALLERGIC SENSITIVITY IN SOME

INDIVIDUALS.

(c) Remove the three nuts (01-140) (3/16 inch wrench size) from the axis-A

bearing retainer (01-185). Use a small amount of Ultrachem No. 1

Assembly Fluid or beeswax on socket to help capture the nuts and

prevent them from falling out of the socket.

(d) Remove the small cap plug and the axis-A bearing retainer (01-185)

from accessory drive gearbox assembly (01-270, 72-60-00). Do not

remove the large cap plug.

(4) Remove radial drive shaft assembly (01-100, 72-00-00) as follows (refer to

Figure 2):

(a) Remove the radial drive shaft assembly (01-100, 72-00-00).

(b) Remove the preformed packing (01-175). Dispose of the packing.

(5) Remove axis-A shaft assembly as follows:

CAUTION: . USE RUBBER OR POLYETHYLENE GLOVES WHEN YOU

HANDLE BEARING PARTS TO PREVENT BEARING PARTS

FROM CORRODING.

. DO NOT REMOVE THE LOCKNUT (01-180) FROM THE

SUBASSEMBLY. THE SHAFT ASSEMBLY DOES NOT

REQUIRE DISASSEMBLY FOR THE INSTALLATION OF

THE OIL SLINGER NUT.

(a) Install the axis-A shaft puller 4096620-296 onto the protruding threads

above the locknut (01-180) on the shaft assembly.

(b) Using the T-handle, tighten the tool hand tight.

(c) Using the T-handle, pull the axis-A shaft assembly straight out of the

AGB. If the assembly sticks, gently use the slide-hammer on the puller

to break it loose.

(d) When free, lift the puller and shaft assembly out of the gearbox. Allow

the shim (01-200) to remain in position in the gearbox. If the shim

comes out with the shaft assembly, install it back into the gearbox.

February 11, 2011 CT7-8 S/B 72-0033

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ENGINE - Introduction of Accessory Gearbox Assembly Axis-A Oil Slinger Nut

(e) Keep the shaft assembly clean and free of dirt. Put the assembly in a

plastic bag until ready for slinger installation.

(f) Cover the AGB opening to prevent dirt or other material from entering

the engine.

B. Installation of Axis-A Oil Slinger Nut and Axis-A Shaft Assembly

WARNING: ULTRACHEM NO. 1 ASSEMBLY FLUID

. CONTACT WITH EYES/FACE/SKIN MAY CAUSE IRRITATION OR

BURNING. . PERSONAL PROTECTIVE EQUIPMENT REQUIRED WHEN

HANDLING OR USING THIS MATERIAL.

. MAY LEAD TO ALLERGIC SENSITIVITY IN SOME INDIVIDUALS.

WARNING: LUBRICATING OIL

DO NOT LET LUBRICATING OIL STAY ON YOUR SKIN. DO NOT

BREATHE THE FUMES RELEASED FROM LUBRICATING OIL FOR

A LONG TIME. LUBRICATING OIL IS DANGEROUS TO YOUR EYES,

NOSE, AND LUNGS.

CAUTION: DO NOT SUBSTITUTE SILICONE BASED GREASE (SUCH AS

MOLYKOTE 55 OR COSMOLUBE 615) FOR ENGINE OIL OR

ULTRACHEM NO. 1 ASSEMBLY FLUID WHEN INSTALLING

PACKINGS. SILICONE BASED GREASE CAN CAUSE OIL FOAMING,

OUT OF LIMITS OIL TEMPERATURE, AND OIL PRESSURE

FLUCTUATION.

NOTE: . Only use Approved Oils. Refer to CT7-8 S/B 79-0004.

. Lubricate all packings before installation with Ultrachem No. 1

Assembly Fluid . If Ultrachem No. 1 Assembly Fluid is not available,

lubricate the packings with approved engine lubricating oil.

(1) Install axis-A oil slinger nut as follows (refer to Figure 3):

(a) Securely install base of slinger torquing fixture BD 001 into a bench vise.

Lubricate the spline of torquing fixture with engine oil.

(b) Install axis-A shaft assembly, locknut end down, onto torquing fixture so

that spline of fixture engages internal spline in axis-A shaft assembly.

(c) Lubricate the threads of axis-A shaft assembly with engine oil.

February 11, 2011 CT7-8 S/B 72-0033

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ENGINE - Introduction of Accessory Gearbox Assembly Axis-A Oil Slinger Nut

NOTE 1: . The oil slinger nut hex is 1 1/16 inch.

. The threads of the oil slinger nut contain a pressed-in material

at three locations that provide secondary retention of the nut.

Do not remove this material.

. To prevent surface corrosion, keep the slinger nut in its original

packaging until it is ready for installation. . Some slinger nuts may have a small dent-like indication on the

face of the threaded end. This is an acceptable manufacturing

indication.

NOTE 2: Tighten and torque the nut slowly in small increments to prevent

heating of the nut. If the nut stops at the pellet location, do not

force it. Remove it and warm the shaft lead-in thread with a heat

gun to about 200°F. Do not heat the nut. Slowly reinstall the nut.

(d) Thread the oil slinger nut all the way onto the shaft assembly.

(e) Torque the oil slinger nut to 360-380 lb in. (40.7-42.9 N·m). Run-on

torque must be 65 lb in. (7.3 N·m) minimum. Remove axis-A shaft

assembly from slinger torquing fixture.

(2) Install axis-A shaft assembly as follows (refer to Figure 2):

(a) Install axis-A shaft puller 4096620-296 onto the protruding threads

above the locknut on the shaft assembly.

WARNING: LUBRICATING OIL

DO NOT LET LUBRICATING OIL STAY ON YOUR SKIN. DO

NOT BREATHE THE FUMES RELEASED FROM LUBRICATING

OIL FOR A LONG TIME. LUBRICATING OIL IS DANGEROUS

TO YOUR EYES, NOSE, AND LUNGS.

(b) Lubricate the bevel gear and smooth barrel on the shaft assembly with

engine oil.

(c) Carefully and slowly insert the shaft assembly into the AGB and over

the three studs and into the AGB. A slight movement of the shaft may

be necessary to engage the gear teeth. It may be necessary to slightly

rotate or gently bump the assembly into position.

(d) After engagement of the teeth, use the slide hammer weight to tap the

assembly down until it is firmly seated. When shaft is fully seated,

remove the puller.

(e) Do not install the three nuts (01-140, Figure 1) onto the studs at this time.

February 11, 2011 CT7-8 S/B 72-0033

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ENGINE - Introduction of Accessory Gearbox Assembly Axis-A Oil Slinger Nut

(3) Install the radial drive shaft assembly (01-100, 72-00-00, Figure 2) as follows:

(a) Install new packing (01-175).

NOTE: A slight movement of the shaft may be necessary to engage the

spline teeth of the radial drive shaft assembly.

(b) Install the radial drive shaft assembly (01-100, 72-00-00) through port

and into the bore of the AGB.

(4) Install three self-locking nuts (01-140, Figure 1) as follows:

(a) Install the axis-A bearing retainer (01-185) over the three studs in the

AGB axis-A pad.

(b) Install the small cap plug over the axis-A pad.

(c) Carefully install the three nuts (01-140) onto the three studs. Use a

small amount of beeswax on socket to help hold the nuts and prevent

them from falling out of the socket.

(d) Remove both the small cap plug and the large cap plug.

(e) Tighten and torque nuts to 32-35 lb in. (3.6-4.0 N·m).

(5) Install the axis-A lube nozzle (01-160) as follows:

WARNING: ULTRACHEM NO. 1 ASSEMBLY FLUID

. CONTACT WITH EYES/FACE/SKIN MAY CAUSE

IRRITATION OR BURNING.

. PERSONAL PROTECTIVE EQUIPMENT REQUIRED WHEN

HANDLING OR USING THIS MATERIAL. . MAY LEAD TO ALLERGIC SENSITIVITY IN SOME

INDIVIDUALS.

WARNING: LUBRICATING OIL

DO NOT LET LUBRICATING OIL STAY ON YOUR SKIN. DO

NOT BREATHE THE FUMES RELEASED FROM LUBRICATING

OIL FOR A LONG TIME. LUBRICATING OIL IS DANGEROUS

TO YOUR EYES, NOSE, AND LUNGS.

(a) Lubricate packings (01-155, 01-085) before installation with Ultrachem

No. 1 Assembly Fluid. If Ultrachem No. 1 Assembly Fluid is not

available, lubricate the packings with approved engine lubricating oil.

(b) Install packings (01-155, 01-085) onto the axis-A lube nozzle (01-160).

(c) Insert the lube nozzle into the AGB.

February 11, 2011 CT7-8 S/B 72-0033

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ENGINE - Introduction of Accessory Gearbox Assembly Axis-A Oil Slinger Nut

(d) Secure the lube nozzle into the accessory drive gearbox assembly

(01-270, 72-60-00), with washer (01-120) and self-locking nut (01-105).

Torque self-locking nut to 32-35 lb in. (3.6-4.0 N·m).

(6) Install axis-A cover assembly (01-170) as follows:

CAUTION: WHEN YOU INSTALL THE AXIS-A COVER ASSEMBLY

(01-170), USE EXTREME CARE TO AVOID CONTACT AND

PREVENT DAMAGE TO THE AXIS-A LUBE NOZZLE.

(a) Install the axis-A cover assembly (01-170), by pressing lightly on the

cover to seat it into the port on the accessory drive gearbox assembly.

(b) Align tab on the axis-A retaining ring (01-165) with opening for retaining

ring in port. Install the ring.

(c) Gently install the axis-A boot (01-300) and press it all around the axis-A

cover assembly (01-170) to ensure a proper seating of the seal.

C. Reidentification

Re-identify the AGB using shallow vibropeen. Mark a line through existing group

number and add the new group number next to it. For example:

3062T20G—0—6—G09 (CT7-8/-8A/-8A1/-8A5/-8B/-8B5/-8E/-8E5/-8F)

3062T20G—0—8—G10 (CT7-8/-8A/-8A1/-8A5/-8B/-8B5/-8E/-8E5/-8F)

4181T10G—0—2—G04 (CT7-8F5)

D. Post Maintenance Test

Perform an IDLE leak check. Refer to GEK 105159, 72-00-00, TEST, TASK

72-00-00-760-004.

E. Service Record Entry

Record compliance with this Service Bulletin in the appropriate CT7-8 Turboshaft

Engine Service Record.

February 11, 2011 CT7-8 S/B 72-0033

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ENGINE - Introduction of Accessory Gearbox Assembly Axis-A Oil Slinger Nut

Axis-A Cover Assembly - Removal and Installation

Figure 1

February 11, 2011 CT7-8 S/B 72-0033

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ENGINE - Introduction of Accessory Gearbox Assembly Axis-A Oil Slinger Nut

Axis-A Shaft Assembly - Removal and Installation

Figure 2

February 11, 2011 CT7-8 S/B 72-0033

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ENGINE - Introduction of Accessory Gearbox Assembly Axis-A Oil Slinger Nut

Axis-A Oil Slinger Nut - Installation

Figure 3

February 11, 2011 CT7-8 S/B 72-0033

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GE PROPRIETARY INFORMATION - Subject to the restrictions on the cover or first page.