The Duct Assembly,air Conditioning-H, cataloged under National Stock Number 1660-00-421-2075, 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 Arrowhead Products Corp. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 1660-00-421-2075 |
| Primary Part Number | 12990-101A |
| Item Name | Duct Assembly,air Conditioning-H |
| FSC / FSG | 1660 / 16 — Aircraft Air Conditioning, Heating, and Pressurizing Equipment |
| Manufacturer | Arrowhead Products Corp |
| Status | ACTIVE |
| Aircraft Location | AIR TURBINE MOTOR EXHAUST,LH OUTBOARD |
| Side for Which Designed | LEFT SIDE |
| Aircraft Mission Design Series | C-5 |
| 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 |
|---|---|
| 12990-101A PRIMARY | Arrowhead Products Corp (USA) |
| Reference | Meaning |
|---|---|
| 4P94761-101A | 1/2 Source control — Government-approved source U.S. Government activity |
NSN 1660-00-421-2075 is a Duct Assembly,air Conditioning-H, manufactured by Arrowhead Products Corp, classified under FSC 1660, Aircraft Air Conditioning, Heating, and Pressurizing Equipment. Status: active.
NSN 1660-00-421-2075 has 1 manufacturer part number on file: 12990-101A (Arrowhead Products Corp).
Key specifications for 12990-101A: Aircraft Location: AIR TURBINE MOTOR EXHAUST,LH OUTBOARD; End Item Identification: C-5 AIRCRAFT; Side for Which Designed: LEFT SIDE; Aircraft Mission Design Series: C-5. 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 1660-00-421-2075 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.