PartsTable TECHNICAL DATA SHEET

NSN 4820-01-666-3059Government record, cited

Module Assembly, Pressure Relief4820-01-666-3059

NSN 4820-01-666-3059 · NIIN 016663059 · Part number 25-8NF3927-1A

Textron Aviation Inc · FSC 4820 — Valves, Nonpowered · FSG 48 — Valves · CAGE 7EK50

Government record, cited

NSN 4820-01-666-3059 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-666-3059. Manufacturer of record part number: 25-8NF3927-1A.

Also searched as 4820-01-666-3059 · 4820016663059 · NIIN 016663059 · 01-666-3059 · FSC 4820 Valves, Nonpowered · CAGE 7EK50 · 25-8NF3927-1A

Nearby stock numbers ← 4820-01-666-2923 Retainer, Disk, Valve · 4820-01-666-3104 Seat, Valve →

4820-01-666-3059 — Valves, Nonpowered

Features

Module Assembly,pressure Relief — FSC 4820
Supplementary Features: ALT SPARE: C9032-047A, C9032-047B A
1 manufacturer part number on file
Manufacturer of record: Textron Aviation Inc

Identification

NSN: 4820-01-666-3059
NIIN: 016663059
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
Primary part number: 25-8NF3927-1A
Manufacturer: Textron Aviation Inc

General Description

The Module Assembly,pressure Relief, cataloged under National Stock Number 4820-01-666-3059, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Textron Aviation Inc. Government technical data includes 1 specification, 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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.

Technical Specifications

Parameter	Value
NSN	4820-01-666-3059
Primary Part Number	25-8NF3927-1A
Item Name	Module Assembly,pressure Relief
FSC / FSG	4820 / 48 — Valves, Nonpowered
Manufacturer	Textron Aviation Inc
Status	ACTIVE
Supplementary Features	ALT SPARE: C9032-047A, C9032-047B A

Lifecycle & Compliance

Acquisition Status	ACTIVE
DEMIL Code	DEMIL A — No Demilitarization Required
Hazard	No hazard code in the DLA record (HMIC N)
Criticality Code	X

Cross-Reference Index

Part Number	Manufacturer
25-8NF3927-1A PRIMARY	Textron Aviation Inc (USA)

Reference documents

Reference	Meaning
25-8NF3927-1A	3/9 Design control — primary reference Beechcraft Corporation Dba Textron Aviation

No interchangeability data on file.

Other items in FSC 4820 — Valves, Nonpowered

Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.

4820-00-000-0097

4820-00-000-0097 · Item name not on file

4820-00-001-0010

VALVE,ROTARY,SELECTOR

4820-00-001-0020

4820-00-001-0020 · Item name not on file

4820-00-001-0021

4820-00-001-0021 · Item name not on file

4820-00-001-0032

4820-00-001-0032 · Item name not on file

4820-00-001-0037

VALVE,SAFETY RELIEF

4820-00-001-0042

4820-00-001-0042 · Item name not on file

4820-00-001-1230

4820-00-001-1230 · Item name not on file

Frequently Asked Questions

What is NSN 4820-01-666-3059?

NSN 4820-01-666-3059 is a Module Assembly,pressure Relief, manufactured by Textron Aviation Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.

What part numbers are listed for NSN 4820-01-666-3059?

NSN 4820-01-666-3059 has 1 manufacturer part number on file: 25-8NF3927-1A (Textron Aviation Inc).

What are the specifications of 25-8NF3927-1A?

Key specifications for 25-8NF3927-1A: Supplementary Features: ALT SPARE: C9032-047A, C9032-047B A; Special Features: FOR HAWKER 800XP/850XP; Part Name Assigned by Controlling Agency: MODULE ASSY-INDICATOR RK. 1 specification is documented in the U.S. Government catalog.

Is NSN 4820-01-666-3059 hazardous material?

No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.

Sources

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.

✓ Data cited from the U.S. Government catalog; commercial cross-references from OEM and certified industry sources.

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