The Housing,shutoff Valve, cataloged under National Stock Number 1660-00-656-8738, 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 Honeywell International, Inc Div Aerospace-Tucson. Government technical data includes 1 specification, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 1660-00-656-8738 |
| Primary Part Number | 135997 |
| Item Name | Housing,shutoff Valve |
| FSC / FSG | 1660 / 16 — Aircraft Air Conditioning, Heating, and Pressurizing Equipment |
| Manufacturer | Honeywell International, Inc Div Aerospace-Tucson |
| Status | ACTIVE |
| General Characteristics Item Description | CRES PER MIL-S-7720,COMP 303,COND A OR EMS544,COMP 17-4PH;0.980 IN. LG O/A;0.7435 IN. DIA BY 0.500 IN. ID BY 0.485 IN. LG W/0.750-10 UNC-3A THD BY 0.385 IN. LG FIRST END;0.500 IN. DIA BY 0.375 IN. ID BY 0.380 IN. LG W/0.1625 IN. DIA HOLE THRU;0.105 IN. THK BY 0.880 IN. ACROSS FLATS HEX. FLANGE LOCATED 0.485 IN. FROM FIRST END A |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
NSN 1660-00-656-8738 is a Housing,shutoff Valve, manufactured by Honeywell International, Inc Div Aerospace-Tucson, classified under FSC 1660, Aircraft Air Conditioning, Heating, and Pressurizing Equipment. Status: active.
NSN 1660-00-656-8738 has 2 manufacturer part numbers on file: 135997 (Honeywell International, Inc Div Aerospace-Tucson), 135997 (Honeywell International Inc. Div Aerospace - Torrance).
1 possible match (shared part number, not a government interchangeability claim): 5935-01-586-5479. Verify interchangeability with system specifications before substitution.
Key specifications for 135997: General Characteristics Item Description: CRES PER MIL-S-7720,COMP 303,COND A OR EMS544,COMP 17-4PH;0.980 IN. LG O/A;0.7435 IN. DIA BY 0.500 IN. ID BY 0.485 IN. LG W/0.750-10 UNC-3A THD BY 0.385 IN. LG FIRST END;0.500 IN. DIA BY 0.375 IN. ID BY 0.380 IN. LG W/0.1625 IN. DIA HOLE THRU;0.105 IN. THK BY 0.880 IN. ACROSS FLATS HEX. FLANGE LOCATED 0.485 IN. FROM FIRST END A; End Item Identification: 1660-00-588-9215;REGULATOR,AIR. 1 specification is 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 1660-00-656-8738 has DEMIL Code B. 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.