AEROSPACE
STANDARD
AS20708/20
Issued
Revised
AEROSPACE
REV. A
1999-07
Proposed Draft
2010-07-12
Superseding AS20708/20
Synchro, Control Transmitter, Type 15CX6C
FSC 5990
RATIONALE
This Revision consists of a 5 (five) year review, which provides updates to current format and references
NOTICE
This document has been taken directly from U.S. Military Specification MIL-S-20708/20E and contains only minor editorial
and format changes required to bring it into conformance with the publishing requirements of SAE technical standards.
The initial release of this document is intended to replace MIL-S-20708/20E. Any part numbers established by the original
specification remain unchanged.
The original Military Specification was adopted as an SAE standard under the provisions of the SAE Technical Standards
Board (TSB) Rules and Regulations (TSB 001) pertaining to accelerated adoption of government specifications and
standards. TSB rules provide for (a) the publication of portions of unrevised government specifications and standards
without consensus voting at the SAE Committee level, and (b) the use of the existing government specification or standard
format.
Under Department of Defense policies and procedures, any qualification requirements and associated qualified products
lists are mandatory for DOD contracts. Any requirement relating to qualified products lists (QPL’s) has not been adopted
by SAE and is not part of this SAE technical document.
This specification is approved for use by all Departments and Agencies of the Department of Defense. The requirements
for acquiring the Synchros described herein shall consist of this specification and the latest issue of MIL-S-20708 SAEAS20708...
__________________________________________________________________________________________________________________________________________
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SAE
AS20708/20A
Page 2 of 3
TABLE 1 – REQUIREMENTS
REQUIREMENT
VALUE
Frequency
Primary Voltage
Primary Current
Primary Power
Impedance:
Zro
Zss
Impedance Angle:
Zro
Zss
Transformation Ratio
Phase Shift (Lead)
Electrical Error
Null Voltage:
Total
Fundamental
Friction Torque
Radial Play
End Play
Temperature Rise
UNIT
60
115
22.0
0.43
TOLERANCE
Hz
Volts
Milliamps
Watts
±1%
±1%
Maximum
Maximum
Ohms
Ohms
Min. – Max.
Min. – Max.
80.0 - 83.0
11.0 - 16.0
0.783
7.0
6.0
Degrees
Degrees
-----Degrees
Minutes
Min. – Max.
Min. – Max.
±2%
± 1.5
Maximum
90.0
45.0
0.05
0.0006
0.0010
20.0
Millivolts
Millivolts
Ounce – Inches
Inches
Inches
Degrees - C
Maximum
Maximum
Maximum
Maximum
± 0.0005
Maximum
5,335 – 6,265
675 – 825
TABLE 2 – MILITARY PART NUMBER VARIANT CHARACTERISTICS
Military Part No.
A
B
G
Shaft
Terminal
1/
± .010
± .010
Maximum
Style
End
M20708/20-01C
M20708/20-02C
M20708/20-03C
.555
.500
2.391
2.391
2.129
Splined
Plain & Slotted
Plain & Slotted
Terminal Board
Terminal Board
Wire Leads
U 2/
+ .0000
- .0002
.1872
1/ Military part number M20708/20-01C shall be the NATO standard.
1/ The suffix letter following the numerical dash number corresponds to the latest modification letter in
the type designation.
2/ The tolerance for plain and slotted shaft diameters is + .0000 and – .0005.
SAE
AS20708/20A
Page 3 of 3
TABLE 3 – MILITARY PART NUMBER CROSS-REFERENCES
SUPERSEDED MILITARY PART NUMBERS
MIL-S-20708/20C
MIL-S-20708/20B
M20708/20C -001
M20708/20-001
M20708/20C -002
M20708/20C -003
NEW MILITARY PART NUMBERS
SAE-AS20708/20A
M20708/20-01C
M20708/20-02C
M20708/20-03C
NOTE: All line items shown in table 3 refer to equivalent and interchangeable Synchros of the
same type designation modification. Part number changes do not affect form, fit, or
function of the Synchros listed therein.
A change bar (|) located in the left margin is for the convenience of the user in locating areas where
technical revisions, not editorial changes, have been made to the previous issue of this document. An
(R) symbol to the left of the document title indicates a complete revision of the document, including
technical revisions. Change bars and (R) are not used in original publications, nor in documents that
contain editorial changes only.
PREPARED BY SAE COMMITTEE AE-7A - GENERATORS/CONTROLS/MAGNETIC DEVICES