FSC 1660 — Aircraft Air Conditioning, Heating, and Pressurizing Equipment · FSG 16 — Aircraft Components and Accessories
Government record, cited
Also searched as1660-01-658-4949 ·
1660016584949 ·
NIIN 016584949 ·
01-658-4949 ·
FSC 1660 Aircraft Air Conditioning, Heating, and Pressurizing Equipment
Nearby stock numbers← 1660-01-658-4943 Duct Assembly, Air Conditioning-H
·
1660-01-658-6331 Manifold Assembly, H →
Features
Diffuser,rect — FSC 1660
Supplementary Features: USED ON OSGCS BLOCK III
Features Provided: FRAMED
Service Type: AIRCRAFT VEHICLE
Identification
NSN: 1660-01-658-4949
NIIN: 016584949
FSC: 1660 — Aircraft Air Conditioning, Heating, and Pressurizing Equipment
FSG: 16 — Aircraft Components and Accessories
General Description
The Diffuser,rect, cataloged under National Stock Number 1660-01-658-4949, is classified within Federal Supply Class 1660 (Aircraft Air Conditioning, Heating, and Pressurizing Equipment) of the Aircraft Components and Accessories 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3 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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.
Technical Specifications
Parameter
Value
NSN
1660-01-658-4949
Item Name
Diffuser,rect
FSC / FSG
1660 / 16 — Aircraft Air Conditioning, Heating, and Pressurizing Equipment
Status
ACTIVE
Supplementary Features
USED ON OSGCS BLOCK III
Features Provided
FRAMED
Service Type
AIRCRAFT VEHICLE
Lifecycle & Compliance
Acquisition Status
ACTIVE
DEMIL Code
DEMIL C — Remove/Demil Key Points
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
39278-90014-1
3/2Design control — primary reference
U.S. Government activity
No interchangeability data on file.
Other items in FSC 1660 — Aircraft Air Conditioning, Heating, and Pressurizing Equipment
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
1660-00-001-1693
DUCT ASSEMBLY,AIR CONDITIONING-H
1660-00-001-1754
BAFFLE,AIR
1660-00-001-2491
CAGE,BYPASS VALVE
1660-00-001-2493
1660-00-001-2493 · Item name not on file
1660-00-001-2496
CONTROL BOX,ELECTRICAL-ELECTRONI
1660-00-001-2497
1660-00-001-2497 · Item name not on file
1660-00-001-4130
1660-00-001-4130 · Item name not on file
1660-00-001-4479
CONTROLLER,AIR PRESSURE,AIRCRAFT
Frequently Asked Questions
What is NSN 1660-01-658-4949?
NSN 1660-01-658-4949 is a Diffuser,rect, classified under FSC 1660, Aircraft Air Conditioning, Heating, and Pressurizing Equipment. Status: active.
What are the specifications of 1660-01-658-4949?
Key specifications for 1660-01-658-4949: Overall Height: 1.25 INCHES NOMINAL IN; Supplementary Features: USED ON OSGCS BLOCK III; Overall Length: 5.75 INCHES NOMINAL IN; Overall Width: 18.75 INCHES NOMINAL IN. 3 specifications are documented in the U.S. Government catalog.
Is NSN 1660-01-658-4949 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.
What is the DEMIL code for NSN 1660-01-658-4949?
NSN 1660-01-658-4949 has DEMIL Code C. Demilitarization may be required before disposal or transfer to non-military entities.
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.