April 1, 2004 MORE COMPANY S.B.NO.101 Rev 0
PT6A
TURBOPROP ENGINE
ALTERNATE
VIBRATION ANALYZER
1.
Planning
Information
A.
Effectivity
Applies
to PT6A engines using the following MORE STC’s:
SE000EN PT6A-21, -27, -28
SE00001EN
PT6A-38, -41, -42
SE00002EN
PT6A-34, -34AG, -34B, -36, -114, -114A, -116, -135, -135A
SE00003EN
PT6A-6/C20, -20, -20A, -20B
SE00004EN
PT6A-11, -11AG, -15AG, -110, -112
SE00006EN
PT6A-45A, -45B, -45R
SE00010EN
PT6A-25, -25A
SE00011EN
PT6A-25C
B.
Concurrent
Requirements
None.
C. Reason
To
provide a functionally equivalent but non-identical substitute for the
Chadwick-Helmuth 192A Spectrum Analyzer. The
two systems may not give exactly the same results, but the limits defined in the
MORE STC Manuals do not change.
D.
Description
The
MicroVib II Aircraft Analyzer and MicroBase Vibration Analysis Database.
This
system introduces new functionality that is not available with the
Chadwick-Helmuth 192A as follows:
1.
The Chadwick-Helmuth 192A measures the frequency range from 150 cycles
per minute to 900,000 cycles per minute. The
MicroVib II measures the frequency range from 150 cycles per minute to 1,200,000
cycles per minute.
2.
The MicroVib II can measure IPS, mils, and G’s.
The MicroVib II can measure IPS and G’s in two measurements, faster
than the Chadwick-Helmuth 192A can measure IPS alone.
3.
The MicroVib II measures both frequency and vibration amplitude more
accurately than the Chadwick-Helmuth 192A.
4.
The horizontal scale (frequency) on the Chadwick-Helmuth 192A is
logarithmic, and the frequency on the MicroVib II is linear, making the job of
interpreting the vibration survey less difficult.
5.
Easily transfer Microbase files across the internet.
6.
Propeller balancing solutions are provided by the MicroVib II Aircraft
Analyzer.
E.
Compliance
This alternative is optional.
F.
Approval
Federal
Aviation Administration has reviewed and approved the technical contents of this
Service Bulletin.
G.
Weight and
Balance
None.
H.
Electrical Load Data
Not
Changed.
I.
Software Accomplishment Summary
Contact
MORE Company, Inc. at 775-782-3346 to obtain the “MORE Report Generator”
software. This software will
generate the results in an authorized format “Authorized MORE STC Report”.
This report allows an internal cross check confirming required limits are
met.
J.
References
Comply
with DSS Application Note – AN-PT6M.
K.
Publications
Affected
The
following MORE Company, Inc. STC’s are affected:
SE000EN
PT6A-21, -27, -28
SE00001EN
PT6A-38, -41, -42
SE00002EN
PT6A-34, -34AG, -34B, -36, -114, -114A, -116, -135, -135A
SE00003EN
PT6A-6/C20, -20, -20A, -20B
SE00004EN
PT6A-11, -11AG, -15AG, -110, -112
SE00006EN
PT6A-45A, -45B, -45R
SE00010EN
PT6A-25, -25A
SE00011EN
PT6A-25C
L.
Interchangeability and Intermixability of Parts
Not
applicable.
2.
Material Information
A.
Industry Support Information
Not Applicable.
B.
Material Availability
The
MicroVib II Aircraft Analyzer can be purchased from Dynamic Solutions Systems
Inc. 760-598-4000. The MORE STC
Report Generator software can be obtained from MORE Company, Inc. at
775-782-3346.
C. Manpower
Not applicable.
D.Material Necessary for Each Engine
Not
applicable.
E.
Reidentified Parts
None.
F.
Tooling Availability
Not
applicable.
3. Accomplishment Instructions
Comply
with DSS Application Note – AN_PT6M to collect data.
Download data to the MORE STC Report Generator software to obtain the
“Authorized MORE STC Report”.
A. Additional
Information
A
different bracket and vibration sensor is used with the MicroVib II.
The MORE STC Manuals specify the use of Chadwick-Helmuth 192A brackets
6752 or 6752-1. The MicroVib II
uses vibration sensor 1460 and high frequency bracket 1472.
