PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

576521Limiter,temperature,defog Duct

Hamilton Sundstrand Corporation Dba Collins Aerospace · NSN 1660-00-887-3271 · FSC 1660 · No Item Name Available
Verified by PartsTable
NSN 1660-00-887-3271 — this item is cataloged by the U.S. Government under National Stock Number 1660-00-887-3271. Primary manufacturer part number: 576521.
Features
  • Limiter,temperature,defog Duct — FSC 1660
  • General Characteristics Item Description: ALUMINUM;4.250 IN. LG IN
  • 6 verified cross-references
  • Primary manufacturer: Hamilton Sundstrand Corporation Dba Collins Aerospace
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Limiter,temperature,defog Duct, cataloged under National Stock Number 1660-00-887-3271, is classified within Federal Supply Class 1660 (No Item Name Available) of the Aircraft Components and Accessories group. The primary manufacturer of record is Hamilton Sundstrand Corporation Dba Collins Aerospace. Government technical data includes 1 verified specification, sourced from the Federal Logistics Information System (FLIS). This item has 6 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN1660-00-887-3271
Primary Part Number576521
Item NameLimiter,temperature,defog Duct
FSC / FSG1660 / 16 — No Item Name Available
ManufacturerHamilton Sundstrand Corporation Dba Collins Aerospace
StatusCANCELLED
General Characteristics Item DescriptionALUMINUM;4.250 IN. LG IN
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 12
4320-00-195-8595 INTERCHANGEABLE
Sleeve,shaft,pump
5330-00-246-6077513569 INTERCHANGEABLE
Packing,preformed
Westinghouse Air Brake Technologies Corp Dba Westinghouse Air Brake Technologies Corp
6220-00-498-108910542 INTERCHANGEABLE
Collar,tandem Light
Grimes Aerospace Company
5998-00-736-234810542 INTERCHANGEABLE
Circuit Card Assembly
Custom Metering Company Inc
5940-00-983-6105 INTERCHANGEABLE
Terminal Board
3439-01-044-574910542 INTERCHANGEABLE
Tip,resistance Soldering
Assembly Technologies International Inc.
5960-01-068-9607 INTERCHANGEABLE
Electron Tube
5120-01-193-85361401 10542 INTERCHANGEABLE
Bar,socket Wrench Handle
Abb Inc.
4820-01-275-24486532-37-7 INTERCHANGEABLE
Valve,regulating,fluid Pressure
Cooper Interconnect, Inc. Dba Cooper Interconnect Div Interconnect
1650-01-275-254310542 INTERCHANGEABLE
Manifold Assembly,hydraulic
Cooper Interconnect, Inc. Dba Cooper Interconnect Div Interconnect
Cross-Reference Index
Part NumberManufacturer
550992 Hamilton Sundstrand Corporation Dba Collins Aerospace (USA)
10542 United Technologies Corp Hamilton Sundstrand Corp (USA)
DC10542 United Technologies Corp Hamilton Sundstrand Corp (USA)
DC10542 Hamilton Sundstrand Corporation Dba Collins Aerospace (USA)
10542 Hamilton Sundstrand Corporation Dba Collins Aerospace (USA)
576521 PRIMARY Hamilton Sundstrand Corporation Dba Collins Aerospace (USA)
Related Parts
4320-00-195-8595INTERCHANGEABLE
SLEEVE,SHAFT,PUMP
5330-00-246-6077INTERCHANGEABLE
PACKING,PREFORMED
513569
6220-00-498-1089INTERCHANGEABLE
COLLAR,TANDEM LIGHT
10542
5998-00-736-2348INTERCHANGEABLE
CIRCUIT CARD ASSEMBLY
10542
5940-00-983-6105INTERCHANGEABLE
TERMINAL BOARD
3439-01-044-5749INTERCHANGEABLE
TIP,RESISTANCE SOLDERING
10542
5960-01-068-9607INTERCHANGEABLE
ELECTRON TUBE
5120-01-193-8536INTERCHANGEABLE
BAR,SOCKET WRENCH HANDLE
1401 10542
4820-01-275-2448INTERCHANGEABLE
VALVE,REGULATING,FLUID PRESSURE
6532-37-7
1650-01-275-2543INTERCHANGEABLE
MANIFOLD ASSEMBLY,HYDRAULIC
10542
4820-01-275-7410INTERCHANGEABLE
VALVE,ANGLE
6181-96-1
3439-01-316-3734INTERCHANGEABLE
WELDING ELECTRODE SET

Frequently Asked Questions

What is NSN 1660-00-887-3271?

NSN 1660-00-887-3271 is a Limiter,temperature,defog Duct, manufactured by Hamilton Sundstrand Corporation Dba Collins Aerospace, classified under FSC 1660 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 1660-00-887-3271?

NSN 1660-00-887-3271 has 6 cross-referenced part numbers: 550992 (Hamilton Sundstrand Corporation Dba Collins Aerospace), 10542 (United Technologies Corp Hamilton Sundstrand Corp), DC10542 (United Technologies Corp Hamilton Sundstrand Corp), DC10542 (Hamilton Sundstrand Corporation Dba Collins Aerospace), 10542 (Hamilton Sundstrand Corporation Dba Collins Aerospace) and 1 more.

What NSN replaces 1660-00-887-3271?

There are 12 known substitutes for 1660-00-887-3271: 4320-00-195-8595, 5330-00-246-6077, 6220-00-498-1089 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 576521?

Key specifications for 576521: General Characteristics Item Description: ALUMINUM;4.250 IN. LG IN; End Item Identification: 1660000339178. 2 total characteristics are documented in the Federal Logistics Information System.

Is NSN 1660-00-887-3271 still in active supply?

NSN 1660-00-887-3271 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.

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