GTB41.pdf

DEPARTMENT OF THE NAVY

NAVAL SHIP SYSTEMS ENGINEERING STATION

NAVAL SURFACE WARFARE CENTER CARDEROCK DIVISION

5001 SOUTH BROAD STREET

PHILADELPHIA PA 19112-1403

From: Commanding Officer, Naval Ship Systems Engineering Station, Naval Surface Warfare Center, Carderock Division

To: Distribution

Subj: GENERAL GAS TURBINE TECHNICAL DIRECTIVES

IN REPLY REFER TO:

934/123

SEP 1 5 2014

Ref: (a) S9234-AD-MM0-050, Volume 2, Part 3, Revision 7, LM2500 Corrective Maintenance, dated 31 July 2009

(b) LM2500 Gas Turbine Change (GTC) No. 78, Revision 2, "COMPRESSOR VARIABLE STATOR LIFE EXTENSION IMPROVEMENTS", dated 21 June 2007.

Encl: (1) LM2500 Gas Turbine Bulletin No. 41, LM2500 VSV Lever Arm Spherical Bearing Race, Correct Installed Orientation

1. This technical directive (TD) defines a quantitative angular allowance for the correct installation position of the lever arm spherical bearing races with respect to horizontal due to Variable Stator Vane (VSV) actuation lever arms being received from the supply system with incorrectly installed bearing races (Figure 1 ). This TD also directs a one-time inspection of installed shipboard VSV actuation lever arm bearings. Report any bearing position(s) which are out-of-tolerance per the Records Affected section using Enclosure (1). Take enclosure

(1) for action, as required.

2. The technical points of contact is Mr. Marc Calabrese, NSWCCD-SSES 934, COM: (215) 897-7303, DSN: 443-7303, Email: marc.calabrese@navv.mil j~O~

IV AN PINEIRO

By Direction

ROUTINE ACTION

TECHNICAL DIRECTIVE

(Issued in accordance with Marine Gas Turbine Technical Directives Manual, T9234-AB-PRO-010/MGTE TD Guide, Revision 2, dated 31 January 1994.)

DEPARTMENT OF THE NAVY

NAVAL SURFACE WARFARE CENTER CARDEROCK DIVISION

NAVAL SHIP SYSTEMS ENGINEERING STATION

PHILADELPHIA, PA 19112-1403

NSWCCD-SSES 934

Issue Date: 15 SEP 2014

LM2500 GAS TURBINE BULLETIN (GTB) NO. 41

SUBJECT: LM2500 VSV LEVER ARM SPHERICAL BEARING RACE, CORRECT

INSTALLED ORIENTATION

REFERENCE:

(a) S9234-AD-MMO-050, Volume 2, Part 3, Revision 7, LM2500 Corrective Maintenance, dated 31 July 2009

(b) LM2500 Gas Turbine Change (GTC) No. 78, Revision 2, "COMPRESSOR VARIABLE STATOR LIFE

EXTENSION IMPROVEMENTS", dated 21 June 2007.

ENCLOSURES:

(1) LM2500 VSV LEVER ARM BEARING POSITION CHECK REPORT

DOCUMENTATION AFFECTED:

Not Applicable

PURPOSE:

This technical directive (TD) defines a quantitative angular allowance for the correct installation position of the lever arm spherical bearing races with respect to horizontal due to Variable Stator Vane (VSV) actuation lever arms being received from the supply system with incorrectly installed bearing races (Figure 1). This TD also directs a one-time inspection of installed shipboard VSV actuation lever arm bearings. Report any bearing position(s) which are out-of-tolerance per the Records Affected section using Enclosure (1).

APPLICATION:

1. DEPENDENCY:

Reference (b) Incorporated

2. BASIC EQUIPMENT:

All LM2500 Gas Turbine Engines

LM2500 GAS TURBINE BULLETIN NO. 41

3. TRAINERS:

Same as Basic Equipment.

4. SPARES:

COMPLIANCE:

1. BASIC EQUIPMENT:

Comply with the DETAILED INSTRUCTIONS and RECORDS AFFECTED sections.

2. TRAINERS:

3. SPARES:

MAN-HOURS REQUIRED:

NO. OF MEN SKILL TOTAL MAN-HOURS

2 GSM3/MGTI 0.5 hr/engine

SUPPLY DATA:

a. Modification Parts Required:

Not Applicable

b. GFM or Other Materials Required:

Not Applicable

c. Special Support Equipment Required:

Not Applicable

DETAILED INSTRUCTIONS:

1. Comply with reference (a), "Performance of Maintenance Within the Enclosure."

2. Comply with Navy Safety and Occupational Health (SOH) Program Manual for Forces Afloat, OPNAVINST 5100.19 series.

NOTE

• VSV Lever Arms with rubber bearing boots installed were manufactured by General

Electric and have been verified as having the bearing races correctly installed.

• Annotate in the Notes/Comments section of Enclosure (1) and comply with RECORDS

AFFECTED section.

3. Ref (b) states, "For replacement slot loaded bearings, position bearing such that loading slot in outer face is aligned with axis PA facing outboard of GG, and on the opposite side of actuation lever raised pads. Raised pad sides of lever arm are installed facing the engine." See Figure 2. Ref (b) provides no angular specification for positioning the slot with respect to the lever arm.

4. This GTB defines 0°±10° off of axis PA (bottom surface of lever arm) as the tolerance for this position. Using Figures 3, 4, and 5 as a guide, inspect the position of all slot loaded bearings (IGV through stage 6, and VSV feedback cable bearing located between IGV and stage 1 stators on both arms), with respect to the bottom surface of the lever arm.

5. Record any bearing that are out of tolerance in Enclosure (1).

6. The technical point of contact is Mr. Marc Calabrese, NSWCCD-SSES 934, COM: (215) 897-7303, DSN: 443-

7303, Email: marc.calabrese@navy.mil.

Figure 1. Incorrectly Installed VSV Lever Arm Bearing Races mailto:marc.calabrese@navy.mil

Figure 2. Variable Stator Vane (VSV) Lever Arm

Figure 3. VSV Slot Loaded Bearing Position

Figure 4. Maximum Positive (+10°) Angular Allowance

Figure 5. Maximum Negative (-10°) Angular Allowance

RECORDS AFFECTED:

1. WEBLOG I Marine Gas Turbine Equipment Service Record (MGTESR).

a. Gas Generator Assembly WEBLOG MOTE Inspection Record (NAVSEA 9400/4) section - Entry required indicating Inspection type as "Alignment" and date(s) of inspection.

b. Gas Generator Assembly WEB LOG Technical Directives (NA VSEA 9400/6) section - Entry required indicating incorporation (INC) ofTD.

c. Upload a completed copy of Enclosure (1), LM2500 VSV LEVER ARM BEARING POSITION CHECK

REPORT

d. Power Turbine Assembly WEBLOG Technical Directives (NA VSEA 9400/6) section - Entry required (NA) indicating "Not applicable".

e. Gas Turbine Module WEB LOG Technical Directives (NA VSEA 9400/6) section - Entry required (NA) indicating "Not applicable".

2. Comply with latest revision to General Gas Turbine Bulletin (GGTB) No. 3, Marine Gas Turbine Logbooks and Service Records .

PREPARED BY: NSWCCD-SSES Code 934

VERIFIED BY: NSWCCD-SSES Code 934

MGT Life Cycle Manager

NSWCCD-SSES

RESCISSION: This technical directive will remain in effect until rescinded by NSWCCD-SSES Code 934.

ENCL (1)

LM2500 VSV LEVER ARM BEARING POSITION CHECK REPORT

Ship Name: Hull Number:

Location of Ship/Homeport: Date of Inspection:

Accomplished by Ship's Force (Full Name/Rate):

Witnessed by MGTI (Full Name/Rate):

IGV Stage 1 Feedbk Cbl Stage 2 Stage 3 Stage 4 Stage 5 Stage 6

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Notes/Comments: