The Duct Assembly,air Conditioning-H, cataloged under National Stock Number 1660-01-253-2254, 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 Legacy Am&m. Government technical data includes 4 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 1660-01-253-2254 |
| Primary Part Number | L5340281-005 |
| Item Name | Duct Assembly,air Conditioning-H |
| FSC / FSG | 1660 / 16 — Aircraft Air Conditioning, Heating, and Pressurizing Equipment |
| Manufacturer | The Boeing Company Div Legacy Am&m |
| Status | ACTIVE |
| Material Document and Classification | QQ-A-250/11 FED SPEC SINGLE MATERIAL RESPONSE |
| Aircraft Location | CTL AVIONICS RAM AIR AND GND SVCE DUCT |
| Material | ALUMINUM ALLOY 6061 |
| Aircraft Mission Design Series | B-1B |
| 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 |
|---|---|
| L5340281-005 PRIMARY | The Boeing Company Div Legacy Am&m (USA) |
NSN 1660-01-253-2254 is a Duct Assembly,air Conditioning-H, manufactured by The Boeing Company Div Legacy Am&m, classified under FSC 1660, Aircraft Air Conditioning, Heating, and Pressurizing Equipment. Status: active.
NSN 1660-01-253-2254 has 1 manufacturer part number on file: L5340281-005 (The Boeing Company Div Legacy Am&m).
Key specifications for L5340281-005: Material Document and Classification: QQ-A-250/11 FED SPEC SINGLE MATERIAL RESPONSE; Special Features: REPLACES -003; 12.000 IN. LG, 12.000 IN. WIDE, 0.071 IN. THICK; NHA L5340010 IN; Aircraft Location: CTL AVIONICS RAM AIR AND GND SVCE DUCT; End Item Identification: B-1B AIRCRAFT. 4 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 1660-01-253-2254 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.