PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

TTU73ETest Set,synchro

Joint Electronics Type Designation System · NSN 6625-00-691-3811 · FSC 6625 · No Item Name Available
Verified by PartsTable
NSN 6625-00-691-3811 — this item is cataloged by the U.S. Government under National Stock Number 6625-00-691-3811. Primary manufacturer part number: TTU73E.
Features
  • Test Set,synchro — FSC 6625
  • Electrical Power Source Relationship: OPERATING
  • Accessory Component Quantity: 7
  • DC Voltage Rating: 30.0 VOLTS NOMINAL FIRST OPERATING POWER RQMT
  • Depth: 18.000 INCHES NOMINAL IN
  • Major Components: MAJOR TRANSMITTER,TEST TRANSMITTER MASTER INDICATOR,WIRING HARNESS,SELF TEST CONNECTOR,DC VOLTMETER
  • Test Type for Which Designed: 1S A PORTABLE TEST UNIT DESIGNED FOR USE IN THE FIELD FOR TESTING AIRCAFT TYPE DC SELSYN INDICATORS AND TRANSMITTERS
  • Material: STEEL CARRYING CASE
Applications
  • Applications requiring Steel Carrying Case construction
General Description

The Test Set,synchro, cataloged under National Stock Number 6625-00-691-3811, is classified within Federal Supply Class 6625 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is Joint Electronics Type Designation System. Government technical data includes 20 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 3 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active. Unit of issue: EA.

Technical Specifications
ParameterValue
NSN6625-00-691-3811
Primary Part NumberTTU73E
Item NameTest Set,synchro
FSC / FSG6625 / 66 — No Item Name Available
ManufacturerJoint Electronics Type Designation System
StatusACTIVE
Electrical Power Source RelationshipOPERATING
Accessory Component Quantity7
DC Voltage Rating30.0 VOLTS NOMINAL FIRST OPERATING POWER RQMT
Depth18.000 INCHES NOMINAL IN
Major ComponentsMAJOR TRANSMITTER,TEST TRANSMITTER MASTER INDICATOR,WIRING HARNESS,SELF TEST CONNECTOR,DC VOLTMETER
Test Type for Which Designed1S A PORTABLE TEST UNIT DESIGNED FOR USE IN THE FIELD FOR TESTING AIRCAFT TYPE DC SELSYN INDICATORS AND TRANSMITTERS
MaterialSTEEL CARRYING CASE
Width12.000 INCHES NOMINAL IN
Height6.005 INCHES NOMINAL IN
Enclosure FeatureMULTIPLE ITEM W/CARRYING CASE
Electrical Power Source RelationshipOPERATING
Accessory Component Quantity7
DC Voltage Rating30.0 VOLTS NOMINAL FIRST OPERATING POWER RQMT
Depth18.000 INCHES NOMINAL IN
Major ComponentsMAJOR TRANSMITTER,TEST TRANSMITTER MASTER INDICATOR,WIRING HARNESS,SELF TEST CONNECTOR,DC VOLTMETER
Test Type for Which Designed1S A PORTABLE TEST UNIT DESIGNED FOR USE IN THE FIELD FOR TESTING AIRCAFT TYPE DC SELSYN INDICATORS AND TRANSMITTERS
MaterialSTEEL CARRYING CASE
Width12.000 INCHES NOMINAL IN
Height6.005 INCHES NOMINAL IN
Enclosure FeatureMULTIPLE ITEM W/CARRYING CASE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Shelf Life Code0
Criticality CodeS
Unit of IssueEA
SMR CodeVS
Weight15.1100 lbs
Cube3.6045 cu ft
Verified Substitutes 12
4940-00-259-2581840357-000 INTERCHANGEABLE
Heating Element,heater,gun Type
Te Connectivity Corporation Dba Raychem Product Division
1680-00-448-85891460-1 INTERCHANGEABLE
Stem Cap,pump Valve
Weber Industries Inc
2590-00-693-40047000933 INTERCHANGEABLE
Harness,blackout Ta
U S Army Tank Automotive Command Amsta-Im-Mm
5975-00-846-4622 INTERCHANGEABLE
Mounting Base,electrical Equipme
5955-00-918-8375 INTERCHANGEABLE
Crystal Unit,quartz
5962-01-108-7148 INTERCHANGEABLE
Microcircuit,memory
5310-01-148-185799114601 INTERCHANGEABLE
Nut,lock
Alfa Laval Inc
3120-01-209-9513146-01 INTERCHANGEABLE
Bushing,sleeve
Trac Regulator Co., Inc. Dba Trac Regulator Co Inc
6210-01-213-319314-60-1 INTERCHANGEABLE
Lens,light
Vapor Blast Manufacturing Co
5950-01-222-498614601 INTERCHANGEABLE
Transformer,power
Inrcore, Llc Div Inrcore
Cross-Reference Index
Part NumberManufacturer
146-01 Advance Instrument Corp (USA)
TTU73E PRIMARY Joint Electronics Type Designation System (USA)
9910-04 Meggitt (new Hampshire), Inc (USA)
Related Parts
4940-00-259-2581INTERCHANGEABLE
HEATING ELEMENT,HEATER,GUN TYPE
840357-000
1680-00-448-8589INTERCHANGEABLE
STEM CAP,PUMP VALVE
1460-1
2590-00-693-4004INTERCHANGEABLE
HARNESS,BLACKOUT TA
7000933
5975-00-846-4622INTERCHANGEABLE
MOUNTING BASE,ELECTRICAL EQUIPME
5955-00-918-8375INTERCHANGEABLE
CRYSTAL UNIT,QUARTZ
5962-01-108-7148INTERCHANGEABLE
MICROCIRCUIT,MEMORY
5310-01-148-1857INTERCHANGEABLE
NUT,LOCK
99114601
3120-01-209-9513INTERCHANGEABLE
BUSHING,SLEEVE
146-01
6210-01-213-3193INTERCHANGEABLE
LENS,LIGHT
14-60-1
5950-01-222-4986INTERCHANGEABLE
TRANSFORMER,POWER
14601
5330-01-234-5235INTERCHANGEABLE
GASKET
1460-1
3120-01-320-9955INTERCHANGEABLE
BUSHING,SLEEVE
14601

Frequently Asked Questions

What is NSN 6625-00-691-3811?

NSN 6625-00-691-3811 is a Test Set,synchro, manufactured by Joint Electronics Type Designation System, classified under FSC 6625 (No Item Name Available). Status: active.

What are the part numbers for NSN 6625-00-691-3811?

NSN 6625-00-691-3811 has 3 cross-referenced part numbers: 146-01 (Advance Instrument Corp), TTU73E (Joint Electronics Type Designation System), 9910-04 (Meggitt (new Hampshire), Inc).

What NSN replaces 6625-00-691-3811?

There are 12 known substitutes for 6625-00-691-3811: 4940-00-259-2581, 1680-00-448-8589, 2590-00-693-4004 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of TTU73E?

Key specifications for TTU73E: Electrical Power Source Relationship: OPERATING; Accessory Component Quantity: 7; Special Features: OPERATING TEST CAPABILITY-ACHIEVING AND RETAINING A CALIBRATION ACCURACYOF PORM 0.2 PERCENT OF FULL SCALE 360 DEGREES; DC Voltage Rating: 30.0 VOLTS NOMINAL FIRST OPERATING POWER RQMT. 22 total characteristics are documented in the Federal Logistics Information System.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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