PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

4399Block,acft Seat

Lockheed Martin Corp · NSN 1680-00-679-2021 · FSC 1680 · No Item Name Available
Verified by PartsTable
NSN 1680-00-679-2021 — this item is cataloged by the U.S. Government under National Stock Number 1680-00-679-2021. Primary manufacturer part number: 4399.
Features
  • Block,acft Seat — FSC 1680
  • 3 verified cross-references
  • Primary manufacturer: Lockheed Martin Corp
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Block,acft Seat, cataloged under National Stock Number 1680-00-679-2021, is classified within Federal Supply Class 1680 (No Item Name Available) of the Aircraft Components and Accessories group. The primary manufacturer of record is Lockheed Martin Corp. This item has 3 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 6 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Catalog Facts
Item NameBlock,acft Seat
FSC / FSG1680 — No Item Name Available (FSG 16)
ManufacturersAero Engineering & Manufacturing Company of California, Llc Dba Aeroengineering & Manufacturing Co (CAGE 17772); B/e Aerospace Inc Dba Interturbine (CAGE 92802); Lockheed Martin Corp (CAGE 98897)
Technical Specifications
ParameterValue
NSN1680-00-679-2021
Primary Part Number4399
Item NameBlock,acft Seat
FSC / FSG1680 / 16 — No Item Name Available
ManufacturerLockheed Martin Corp
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 6
5920-00-060-11184399 INTERCHANGEABLE
Fuseholder,block
Cooper Bussmann, Llc Dba Cooper Industries
5977-00-284-6722SG45 INTERCHANGEABLE
Brush,electrical Contact
Carbone of America Corporation Div Superior Carbon Products Division
5905-00-982-3337 INTERCHANGEABLE
Resistor,fixed,wire Wound,induct
5855-01-066-4399SM-D-807414 INTERCHANGEABLE
Eyepiece Assembly,optical Instru
Us Army Communications & Electronics Materiel Readiness Command Logistics Engineering Dir
5315-01-282-37544399 INTERCHANGEABLE
Pin
Ingersoll-Rand Co Material Handling Div
6130-01-531-66454399 INTERCHANGEABLE
Power Supply
Omnitron Systems Technology, Inc. Dba Omnitron Systems Technology Inc
Cross-Reference Index
Part NumberManufacturer
4399 Aero Engineering & Manufacturing Company of California, Llc Dba Aeroengineering & Manufacturing Co (USA)
4399 B/e Aerospace Inc Dba Interturbine (USA)
4399 PRIMARY Lockheed Martin Corp (USA)
Related Parts
5920-00-060-1118INTERCHANGEABLE
FUSEHOLDER,BLOCK
4399
5977-00-284-6722INTERCHANGEABLE
BRUSH,ELECTRICAL CONTACT
SG45
5905-00-982-3337INTERCHANGEABLE
RESISTOR,FIXED,WIRE WOUND,INDUCT
5855-01-066-4399INTERCHANGEABLE
EYEPIECE ASSEMBLY,OPTICAL INSTRU
SM-D-807414
5315-01-282-3754INTERCHANGEABLE
PIN
4399
6130-01-531-6645INTERCHANGEABLE
POWER SUPPLY
4399

Frequently Asked Questions

What is NSN 1680-00-679-2021?

NSN 1680-00-679-2021 is a Block,acft Seat, manufactured by Lockheed Martin Corp, classified under FSC 1680 (No Item Name Available). Status: active.

What are the part numbers for NSN 1680-00-679-2021?

NSN 1680-00-679-2021 has 3 cross-referenced part numbers: 4399 (Aero Engineering & Manufacturing Company of California, Llc Dba Aeroengineering & Manufacturing Co), 4399 (B/e Aerospace Inc Dba Interturbine), 4399 (Lockheed Martin Corp).

What NSN replaces 1680-00-679-2021?

There are 6 known substitutes for 1680-00-679-2021: 5920-00-060-1118, 5977-00-284-6722, 5905-00-982-3337 and 3 more. Verify interchangeability with system specifications before substitution.

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