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IliedSignal SERVICE BULLETIN AEROSPACE AlliedSignal Engines Category 1: Safety
ENGINE - GENERAL - INTRODUCTION OF A SPECIAL VIBRATION CHECK
1. Planning Information A. Effectivity This Service Bulletin applies to the following gas turbine engines:
Part No. Model No. Serial No. Application 1-000-060-13 T5313B All Bell 205A-1 Series 1-000-060-21 T5317A All Bell 205A-1 Series 1-000-060-30 T5317B All FujiBell 205B Series Bell 205a - 1 Series B. Concurrent Requirements Does not apply.
C. Reason
(1) Problem:
There have been incidents reported in which the N2 spur gear has failed in service.
(2) Background:
An engineering investigation has concluded that T53 engines exhibiting certain vibration characteristics can produce unacceptable stress levels in the N2 spur gear which can lead to N2 spur gear failure. Failure of the N2 spur gear can result in a disconnection of the N2 drive system and possible uncontained engine failure.
(3) Action:
Perform the special vibration check outlined in this Service Bulletin.
D. Description This Service Bulletin offers a complete vibration analysis method to determine if the T5313B, T5317A, or T5317B engine has vibration characteristics which have been associated with previous N2 spur gear failures.
E. Compliance Compliance addresses a safety issue. AlliedSignal recommends compliance with this Service Bulletin for all T53 series engines. This Service Bulletin should be performed within 100 flight hours (not to exceed a 6 month time period) from the original issue date of this Service Bulletin for installed units. Perform as part of the installation procedures on all engines that are now uninstalled. If procedure has been accomplished during engine test by an authorized service center and noted in the engine logbook, this Service Bulletin does not need to be performed on engine installation.
Nov 19/99 T5313B/17-0100 Page 1 of 5 Copyright 1999 AlliedSignal Inc.
IliedSignal SERVICE BULLETIN AEROSPACE AlliedSignal Engines F. Approval The accomplishment instructions paragraph of this Service Bulletin has been FAA approved.
G. Manpower An estimated 4.0 manhours are necessary to perform this Service Bulletin.
H. Weight and Balance No change.
Electrical Load Data No change.
J. Software Accomplishment Summary Does not apply.
K. References The data used to prepare this Service Bulletin include AlliedSignal engineering documents and the publications shown below:
Publications.
Engine Maintenance Illustrated Parts Model No. Manual No. Catalog No.
T5313B 330.2 330.4 T5317A 330.2 330.4 T5317B 330.2 330.4
(2) Service bulletin references.
None.
L. Other Publications Affected Operational Information Letters (OIL) are issued to inform pilots and maintenance personnel of the effect that an adverse maintenance condition will have on the engine and resulting effects to the aircraft. Ol 53-01 was issued to address the effect of a N2 system disconnect caused by a spur gear failure. All personnel involved with the T5313B, T5317A, and T5317B engine should become familiar with this OIL.
M. Interchangeability or Intermixability of Parts Does not apply.
T5313B/17-0100 Nov 19/99 Page 2
liedSignal SERVICE BULLETIN AEROSPACE AlliedSignal Engines
2. Material Information A. Material - Price and Availability Does not apply.
B. Industry Support Information Does not apply.
C. Material Necessary for Each Engine Does not apply.
D. Material Necessary for Each Spare Does not apply.
E. Reidentified Parts Does not apply.
Tooling - Price and Availability The special tools necessary to do this Service Bulletin are in the manuals shown in paragraph
1.K. (1) and as follows:
Chadwick Helmuth 192 and 8500 series vibration analyzers have been tested and have been able to detect the vibration of interest. When using this equipment the 7310 velocimeter, Mounting Bracket Part No. LTCT535, and Cable Part No. 11210-20/-50 must be used.
If other equipment is used it must have the capability to measure the vibration at a frequency of 0 to 5000 Hz. There cannot be any filters installed in either the velocimeter or vibration analyzer.
To purchase Chadwick Helmuth equipment, send Fax request to (626) 350-4236. One alternate source of vibration equipment is Scientific Precision. For information concerning availability and use of equipment to meet these requirements, contact: Dave Lilly, Phone
(619) 679-6228, Fax (619) 679-6299.
(4) Refer questions on the ground support equipment to AlliedSignal Aerospace, Marketing, Sales & Service, P.O. Box 52170, Phoenix, AZ 85072-2170, Fax (602) 231-2328.
(5) Modification instructions for Mounting Bracket Part No LTCT535.
(a) Locate the center of three existing accelerometer mounting holes.
(b) Drill a 0.213 inch (No. 3 drill) through the bracket. Deburr holes.
(c) Thread hole with a 0.250-28 tap. This hole is used to hold the accelerometer to the bracket. It must hold the accelerometer flush on the bracket. Any deviation from this will cause false information during the vibration check.
Nov 19/99 T5313B/17-0100 Page 3
AlliedSignal SERVICE BULLETIN AEROSPACE AlliedSignal Engines
3. Accomplishment Instructions A. Perform Vibration Test of Engine
(1) Follow vibration equipment manufacturer's instructions for the warm up and installation of the equipment.
(2) There will be one vibration sensor installed at the No. 1 pick up location (lifting eye on top of the engine inlet housing). Use Mounting Bracket Part No. LTCT535. The mounting bracket may require shimming to secure it tightly.
WARNING: A LIMIT OF 0.2 INCHES PER SECOND (IPS) HAS BEEN ESTAB-
LISHED BY ALLIEDSIGNAL ENGINES FOR ANY PEAK WITHIN THE RPM/FREQUENCY BANDS. IF THIS LIMIT IS EXCEEDED IN THE 225,000 TO 250,000 RANGE THE TEST MUST BE TERMINATED AND THE ENGINE REMOVED FROM SERVICE.
NOTE: Contact AlliedSignal Customer Support Engineering with any high vibration data in the 200,000 to 225,000 or above the 250,000 ranges.
(3) After the equipment is installed, perform the vibration test using the parameters listed in Table 1.
Table 1. Vibration Test Output Shaft N2 N1 Rpm/Frequency 6200 rpm 94% 90% 200,000 to 300,000 6400 pm 97% 85% 200,000 to 300,000 6400 rpm 97% 90% 200,000 to 300,000 6300 грт 95.5% 95% 200,000 to 300,000 6400 грт 97% 95% 200,000 to 300,000 6500 грт 98.5% 95% 200,000 to 300,000 6400 грт 97% MAX. 200,000 to 300,000 6600 pm 100% 90% 200,000 to 300,000 NOTE: CPS frequency is 3333 to 5000.
Nov 19/99 T5313B/17-0100 Page 4
AlliedSignal SERVICE BULLETIN AEROSPACE AlliedSignal Engines B. Recheck A recheck is required every 500 hours when Gear Part No. 1-070-062-04 and every 1000 hours when Gear Part No. 1-070-062-06 is installed. A recheck is required whenever disassembly for parts replacement is performed on the Reduction Gearbox Part No.
1-030-350-08/-09/-12/-16.
C. Engines Passing Vibration Check AlliedSignal recommends engines that pass this vibration check within the limit of 0.2 ips be returned to service without flight restrictions.
D. Test the gas turbine engine.
E. Reidentify the gas turbine engine as follows:
Reidentification of the gas turbine engine is not necessary.
F. Compliance with this Service Bulletin must be recorded in the Engine Logbook and the Service Bulletin Compliance Records. Complete and return the Notice of Service Bulletin Compliance (attached) to AlliedSignal Engines.
4. Appendix Does not apply.
Nov 19/99 T5313B/17-0100 Page 5