The Duct Assembly,air Conditioning-H, cataloged under National Stock Number 1660-01-122-9999, 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 Triumph Thermal Systems - Maryland, Inc.. Government technical data includes 2 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 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 | 1660-01-122-9999 |
| Primary Part Number | 107778 |
| Item Name | Duct Assembly,air Conditioning-H |
| FSC / FSG | 1660 / 16 — Aircraft Air Conditioning, Heating, and Pressurizing Equipment |
| Manufacturer | Triumph Thermal Systems - Maryland, Inc. |
| Status | ACTIVE |
| Material Thickness | 7.060 INCHES NOMINAL IN |
| Aircraft Mission Design Series | KC-135 |
| 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 |
|---|---|
| 107778 PRIMARY | Triumph Thermal Systems - Maryland, Inc. (USA) |
NSN 1660-01-122-9999 is a Duct Assembly,air Conditioning-H, manufactured by Triumph Thermal Systems - Maryland, Inc., classified under FSC 1660, Aircraft Air Conditioning, Heating, and Pressurizing Equipment. Status: active.
NSN 1660-01-122-9999 has 1 manufacturer part number on file: 107778 (Triumph Thermal Systems - Maryland, Inc.).
1 possible match (shared part number, not a government interchangeability claim): 5340-01-495-7489. Verify interchangeability with system specifications before substitution.
Key specifications for 107778: Overall Length: 1.720 INCHES NOMINAL IN; Overall Width: 19.000 INCHES NOMINAL IN; Material Thickness: 7.060 INCHES NOMINAL IN; Special Features: C/O 1 DUCT,1 BOSS DRAIN. 2 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 1660-01-122-9999 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.