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4F54308-104B — FLAPPER,RAMP DOOR

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

4F54308-104B: FLAPPER,RAMP DOOR.

The FLAPPER,RAMP DOOR is a the manufacturer industrial component. Key specifications include end_item_identification: AIRCRAFT MODEL C5A. This part is cataloged in the U.S.

Government catalog under NSN 4820-00-449-8957, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
4F54308-104B
NSN: 4820-00-449-8957
FSC: 4820 — Valves, Nonpowered
CAGE: 98897 — LOCKHEED MARTIN CORP (USA)
SPECIFICATIONS
end_item_identificationAIRCRAFT MODEL C5A
NSN4820-00-449-8957
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 4F54308-104B · OEM ⚠ VERIFY BEFORE ORDERING Gate valves = FULL OPEN or FULL CLOSE only — never throttle. Partial opening causes seat erosion and vibration. ✓ BROKER TIP Rising stem shows valve position visually — easier maintenance. Non-rising stem saves headroom. PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
TECHNICAL CHARACTERISTICS
END ITEM IDENTIFICATIONAIRCRAFT MODEL C5A
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 4820-00-001-0010 4820-00-001-0020 4820-00-001-0021 4820-00-001-0032 4820-00-001-0037 4820-00-001-0042 4820-00-001-1230
SUBSTITUTES & CROSS-REFERENCES 2
EF54306-104BReference document
Same NSN cross-reference
Reference document — Secondary reference
4F54308-104AReference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandDemilitarization required — critical (Q)
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FREQUENTLY ASKED QUESTIONS
What is 4F54308-104B?
4F54308-104B is a FLAPPER,RAMP DOOR.
What parts can replace 4F54308-104B?
There are 2 known substitutes for 4F54308-104B: EF54306-104B, 4F54308-104A. Substitute compatibility should be verified for your specific system.
What is the NSN for 4F54308-104B?
4F54308-104B is cataloged in the U.S. Government catalog under NSN 4820-00-449-8957. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.