Reference Data and Literature: T.O.1E-3A-2-23-1 COMMUNICATIONS SYSTEM USAF SECTION X11 AND T.O.35-1-251-1 A
Entry Date: 77-01-01
Functional Description: USED DURING PERFORMANCE OF UNSCHEDULED INTERMEDIATE MAINTENANCE AT THE FLIGHTLINE TO VERIFY THE DC PARAMETER OUTPUTS WHILE TROUBLESHOOTING AND FAULT ISOLATING. THE SIGNAL OUTPUTS FROM THE EGT AND EPR INDICATORS, AND FUEL FLOW (FF) AMPLIFIER ARE REQUIRED TO EXERCISE THOSE CHANNELS OF DATA RECORDED BY THE FLIGHT RECORDER/LOCATOR SYSTEM. THE OUTPUT OF THE FLIGHT RECORDER/LOCATOR SYSTEM IS MONITORED BY THE DATA DISPLAY MONITOR (DDU-4) AS THE INPUT SIGNAL IS VARIED FROM 0 TO 5 VOLTS DC. THE SIGNALS ARE GENERATED BY OPERATING ENGINES OR BY PROVIDING A SIMULATED VOLTAGE AT THE OUTPUT OF EACH INDICATOR AND THE AMPLIFIER. THE INPUT IMPEDANCE OF THE SIGNAL DATA CONVERTER BETWEEN HIGH AND LOW IS 150,000 OHMS (+O.1%)
Identification
NSN: 4920-01-020-8027
NIIN: 010208027
FSC: 4920 — Aircraft Maintenance and Repair Shop Specialized Equipment
FSG: 49 — Maintenance and Repair Shop Equipment
General Description
The Test Set Subassembly,aircraft Co, cataloged under National Stock Number 4920-01-020-8027, is classified within Federal Supply Class 4920 (Aircraft Maintenance and Repair Shop Specialized Equipment) of the Maintenance and Repair Shop Equipment group. Government technical data includes 3 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
T.O.1E-3A-2-23-1 COMMUNICATIONS SYSTEM USAF SECTION X11 AND T.O.35-1-251-1 A
Entry Date
77-01-01
Functional Description
USED DURING PERFORMANCE OF UNSCHEDULED INTERMEDIATE MAINTENANCE AT THE FLIGHTLINE TO VERIFY THE DC PARAMETER OUTPUTS WHILE TROUBLESHOOTING AND FAULT ISOLATING. THE SIGNAL OUTPUTS FROM THE EGT AND EPR INDICATORS, AND FUEL FLOW (FF) AMPLIFIER ARE REQUIRED TO EXERCISE THOSE CHANNELS OF DATA RECORDED BY THE FLIGHT RECORDER/LOCATOR SYSTEM. THE OUTPUT OF THE FLIGHT RECORDER/LOCATOR SYSTEM IS MONITORED BY THE DATA DISPLAY MONITOR (DDU-4) AS THE INPUT SIGNAL IS VARIED FROM 0 TO 5 VOLTS DC. THE SIGNALS ARE GENERATED BY OPERATING ENGINES OR BY PROVIDING A SIMULATED VOLTAGE AT THE OUTPUT OF EACH INDICATOR AND THE AMPLIFIER. THE INPUT IMPEDANCE OF THE SIGNAL DATA CONVERTER BETWEEN HIGH AND LOW IS 150,000 OHMS (+O.1%)
Lifecycle & Compliance
Acquisition Status
ACTIVE
DEMIL Code
DEMIL A — No Demilitarization Required
Hazard
No hazard code in the DLA record (HMIC N)
Criticality Code
X
Cross-Reference Index
No manufacturer part numbers on file in the U.S. Government catalog.
Reference documents
Reference
Meaning
204-91965-1
3/2Design control — primary reference
U.S. Government activity
No interchangeability data on file.
Other items in FSC 4920 — Aircraft Maintenance and Repair Shop Specialized Equipment
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
4920-00-000-0190
TEST SET,FLIGHT CONTROL SYSTEM
4920-00-001-1405
4920-00-001-1405 · Item name not on file
4920-00-001-1716
4920-00-001-1716 · Item name not on file
4920-00-001-1744
4920-00-001-1744 · Item name not on file
4920-00-001-1745
4920-00-001-1745 · Item name not on file
4920-00-001-1746
4920-00-001-1746 · Item name not on file
4920-00-001-1747
4920-00-001-1747 · Item name not on file
4920-00-001-1748
4920-00-001-1748 · Item name not on file
Frequently Asked Questions
What is NSN 4920-01-020-8027?
NSN 4920-01-020-8027 is a Test Set Subassembly,aircraft Co, classified under FSC 4920, Aircraft Maintenance and Repair Shop Specialized Equipment. Status: active.
What are the specifications of 4920-01-020-8027?
Key specifications for 4920-01-020-8027: Overall Height: 8.000 INCHES NOMINAL IN; Reference Data and Literature: T.O.1E-3A-2-23-1 COMMUNICATIONS SYSTEM USAF SECTION X11 AND T.O.35-1-251-1 A; Overall Length: 12.000 INCHES NOMINAL IN; Overall Width: 8.750 INCHES NOMINAL IN. 3 specifications are documented in the U.S. Government catalog.
Is NSN 4920-01-020-8027 hazardous material?
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
Sources
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
✓ Data cited from the U.S. Government catalog; commercial cross-references from OEM and certified industry sources.