# AlliedSignal Service Bulletin T5311A/B-0100 Copy: No revision named ("AlliedSignal Aerospace SB T5311A-B-0100"), 5 pages: PDF https://openairdocs.org/files/sha256/b0/87/b0876d799735afab83d28c537c35692939f2bcc747f99959543371ff339ef27c; text https://openairdocs.org/service-documents/honeywell/t5311a-b-0100/file/b0876d799735.md. Rights: © Honeywell International Inc. Filed by the FAA in regulations.gov docket FAA-2021-1185; AD 2022-10-02 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication. ## Details - Manufacturer: [Honeywell](https://openairdocs.org/service-documents/honeywell.md) (issued as AlliedSignal) - Type: Service bulletin (Service Bulletin) - Number: T5311A/B-0100 - Page: https://openairdocs.org/service-documents/honeywell/t5311a-b-0100 ## ADs that cite it (1) (OpenAirDocs) Newest first, with the revision each names, as OpenAirDocs read it from the AD's text. - [AD 2022-10-02](https://openairdocs.org/ad/2022-10-02.md), effective Jun 28, 2022: No revision named Also cited in [1 proposed AD](https://openairdocs.org/service-documents/honeywell/t5311a-b-0100/proposed.md). ## Text (5 pages) Rights: © Honeywell International Inc. Filed by the FAA in regulations.gov docket FAA-2021-1185; AD 2022-10-02 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication. This text is OCR from a scan. OCR can misread letters and numbers. Each page's text from the PDF; open the PDF at a page with #page=N. ### Page 1 (OCR) liedSignal 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 1-000-080-03 T5311A All 204B Series 1-000-080-11 T5311B All 204B Series B. Concurrent Requirements Does not apply. C. Reason 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 T5311A and T5311B engines have vibration characteristics which has been associated with previous spur gear failures. E. Compliance Compliance addresses a safety issue. AlliedSignal recommends compliance with this Service Bul- letin 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 cen- ter and noted in the engine logbook, this Service Bulletin does not need to be performed on en- gine installation. Jan 20/00 T5311A/B-0100 Page 1 of 5 Copyright 2000 AlliedSignal Inc. ### Page 2 (OCR) 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: (1) Publications. Engine Maintenance Illustrated Parts Model No. Manual No. Catalog No. T5311 T5311-2 T5311-4 (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, Revision 1 was issued to address the effect of a N2 system disconnect caused by a spur gear failure. All personnel involved with the T5311A and T5311B engine should become familiar with this OIL. Interchangeability or Intermixability of Parts Does not apply. 2. Material Information A. Material - Price and Availability Does not apply. Jan 20/00 T5311A/B-0100 Page 2 ### Page 3 (OCR) AlliedSignal SERVICE BULLETIN AEROSPACE AlliedSignal Engines 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. F. 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: (1) 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 velocime- ter, Mounting Bracket Part No. LTCT535, and Cable Part No. 11210-20/-50 must be used. (2) If other equipment is used it must have the capability to measure the vibration at a frequen- cy 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 al- ternate 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. 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. Jan 20/00 T5311A/B-0100 Page 3 ### Page 4 (OCR) AlliedSignal SERVICE BULLETIN AEROSPACE AlliedSignal Engines 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 IPS (INCHES PER SECOND) 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 грт 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 rpm 97% 95% 200,000 to 300,000 6500 rpm 98.5% 95% 200,000 to 300,000 6400 rpm 97% Max. 200,000 to 300,000 6600 pm 100% 90% 200,000 to 300,000 NOTE: CPS frequency is 3333 to 5000. B. Recheck A recheck is required every 500 hours when Gear Part No. 1-070-062-04 or 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. 1-030-350-05/-08/-09/-12. 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. Jan 20/00 T5311A/B-0100 Page 4 ### Page 5 (OCR) AlliedSignal SERVICE BULLETIN AEROSPACE AlliedSignal Engines D. Test the gas turbine engine. E. Reidentify the gas turbine engine as follows: Reidentification of the gas turbine engine is not necessary. 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 (at- tached) to AlliedSignal Engines. 4. Appendix Does not apply. Jan 20/00 T5311A/B-0100 Page 5 --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain, except the copies of manufacturers’ service documents, which belong to their rights holders.