The Duct Assembly,air Conditioning-H, cataloged under National Stock Number 1660-01-172-9349, 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 2 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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.
| Parameter | Value |
|---|---|
| NSN | 1660-01-172-9349 |
| Item Name | Duct Assembly,air Conditioning-H |
| FSC / FSG | 1660 / 16 — Aircraft Air Conditioning, Heating, and Pressurizing Equipment |
| Status | ACTIVE |
| Aircraft Location | TUBE ASSEMBLY |
| Aircraft Mission Design Series | C-135 |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 65C18640-612 | 3/2 Design control — primary reference U.S. Government activity |
NSN 1660-01-172-9349 is a Duct Assembly,air Conditioning-H, classified under FSC 1660, Aircraft Air Conditioning, Heating, and Pressurizing Equipment. Status: active.
Key specifications for 1660-01-172-9349: Special Features: HYDROSTATIC PROOF PRESSURE TEST TO AN INTERNAL PRESSURE OF 300 PSIG AT ROOM TEMPERTURE; FINISH F-4.10; CONSIST OF ONE ELBOW ASSEMBLY,FOUR TUBE HALF-MATL INCONEL 625 SHEET PER AMS5599,FINISH F-25.05; TWO ELBOW HALF STOCK SIZE 0.050 SHEET X 5.000 X 7.300 IN. MATL INCONEL 625 SHEET PER AMS 5599,FINISH F-25.05; ONE TUBE STOCK SIZE 0.050 WALL X 3.000 X 3.900 IN.,MATL INCONEL 625 TUBING PER BMS7-188 TYPE 1,FINISH F-25.05; TWO FLANGE; NHA 65C18640-606; PNEUMATIC INSTALLATION STRUT IN; Aircraft Location: TUBE ASSEMBLY; End Item Identification: C-135 AIRCRAFT; Aircraft Mission Design Series: C-135. 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.
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.