The Insulation Blanket,thermal,aircr, cataloged under National Stock Number 1660-01-549-2209, is classified within Federal Supply Class 1660 (Aircraft Air Conditioning, Heating, and Pressurizing Equipment) of the Aircraft Components and Accessories group. The manufacturer of record is The Boeing Company Div Defense. Government technical data includes 3 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 1660-01-549-2209 |
| Primary Part Number | 74A835789-2165 |
| Item Name | Insulation Blanket,thermal,aircr |
| FSC / FSG | 1660 / 16 — Aircraft Air Conditioning, Heating, and Pressurizing Equipment |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Length | 4.700 INCHES NOMINAL IN |
| Width | 4.400 INCHES NOMINAL IN |
| Material | FIBERGLASS LAYER |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 74A835789-2165 PRIMARY | The Boeing Company Div Defense (USA) |
| Reference | Meaning |
|---|---|
| 01-578-5841 | 6/9 Informative reference only Replacement NSN of Temporarily Maintained NSN |
NSN 1660-01-549-2209 is a Insulation Blanket,thermal,aircr, manufactured by The Boeing Company Div Defense, classified under FSC 1660, Aircraft Air Conditioning, Heating, and Pressurizing Equipment. Status: active.
NSN 1660-01-549-2209 has 1 manufacturer part number on file: 74A835789-2165 (The Boeing Company Div Defense).
1 possible match (shared part number, not a government interchangeability claim): 1680-01-578-5841. Verify interchangeability with system specifications before substitution.
Key specifications for 74A835789-2165: Length: 4.700 INCHES NOMINAL IN; Special Features: SHEET 0.125; MATERIAL MIN-K, COMMERCIAL GRADE, TYPESS, QUILTED, FLEXIBLE, SRGA-0409U SILICONE IMPREGNATED ALUMINIZED FIBERGLASS CLOTH TO BOTH SIDES OF BLANKET; Width: 4.400 INCHES NOMINAL IN; Part Name Assigned by Controlling Agency: DP INSULATION. 3 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
NSN 1660-01-549-2209 has DEMIL Code Q. Demilitarization may be required before disposal or transfer to non-military entities.
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.