What Gulfstream IV/G400/G450 parts are for sale on PartsAndPlanes?

No listing is tagged to the Gulfstream IV/G400/G450 today; a request from this page reaches sellers who carry its families, and the part pages show who has each number.

Which airworthiness directives apply to the Gulfstream IV/G400/G450?

12 FAA airworthiness directives on our record name the Gulfstream IV/G400/G450, 6 of them final; each links to the AD page with the part numbers it names.

What parts fail most often on the Gulfstream IV/G400/G450?

Operators filed 88 service difficulty reports on the Gulfstream IV/G400/G450 in five years; the parts reported most were Flap System (1159CS20000560), Hydraulic Line (1159H4020027), Dump Valve (1159SCH51219), Window (1159CE2003437). Counts are the FAA's; they describe reporting, not reliability.

How many Gulfstream IV/G400/G450 aircraft are registered in the U.S.?

612 aircraft across 5 model variants, held by 480 registrants; the largest fleets are in CA, UT, DE.

Home · Aircraft · Gulfstream IV/G400/G450

Gulfstream IV/G400/G450 parts: what is for sale, what fails, which ADs apply

612 Gulfstream IV/G400/G450 aircraft are on the U.S. registry across 5 variants. This page gathers what the record holds for the type: parts listed here with condition and trace, the airworthiness directives that name it, the parts operators report most in FAA service difficulty reports, and who can repair its components. Every part number links to its own page. Data, not advice.

parts listed here

sellers

airworthiness directives

service reports, 5 yr

612

U.S. aircraft

480

registrants

For sale here, tagged to the Gulfstream IV/G400/G450

No listing is tagged to this aircraft today. Search any part number for who has it, or send a request from the part page; sellers who carry the families are told within the hour.

Sellers: parts you list with an aircraft type appear here automatically. Listing is free, no commission.

Parts operators report most on the Gulfstream IV/G400/G450

From 88 FAA service difficulty reports filed in the last five years. A count is how often a part was reported, not a judgment of the part; high-count items are the ones a shop should have on the shelf.

Part	Most-reported part number	Reports
Flap System	1159CS20000560	4
Hydraulic Line	1159H4020027	3
Dump Valve	1159SCH51219	3
Window	1159CE2003437	3
Windshield	1159SCB10213	3
Panel	not stated	3
Mount	not stated	2
Actuator	1159SCL200465B8	2
Wedge	not stated	2
Wire	not stated	2
Control Valve	1159SCH23133	2
Outflow Valve	10274642	2
Controller	10421	2
Electronic Unit	60065261	2
Switch	1159F5014061	2
Engine	TAY6118C	2
Cabin Pressure	not stated	2
Fuel Sys	not stated	1
Handle	not stated	1
Hose	1159H4020083	1

Airworthiness directives naming the Gulfstream IV/G400/G450

6 final, 6 proposed. Each AD page lists the part numbers it names and who sells them.

2023-08-03 · Gulfstream Aerospace Corporation Airplanes · May 16, 2023
2022-25693 proposed · Gulfstream Aerospace Corporation Airplanes · Nov 25, 2022
2022-02-15 · Gulfstream Aerospace Corporation Airplanes · Jan 20, 2022
2021-23013 proposed · Gulfstream Aerospace Corporation Airplanes · Oct 26, 2021
2020-12-06 · Gulfstream Aerospace Corporation Airplanes · Jun 15, 2020
2019-27716 proposed · Gulfstream Aerospace Corporation Airplanes · Dec 27, 2019
2019-20-08 · Gulfstream Aerospace Corporation Airplanes · Nov 8, 2019
2019-06275 proposed · Gulfstream Aerospace Corporation Airplanes · Apr 2, 2019
2018-16491 proposed · Gulfstream Aerospace Corporation Airplanes · Aug 2, 2018
2018-15964 proposed · Gulfstream Aerospace Corporation Airplanes · Jul 27, 2018
2018-09-04 · Gulfstream Aerospace Corporation Airplanes · Jun 11, 2018
2018-09-04 · Gulfstream Aerospace Corporation Airplanes · May 7, 2018

The fleet

612 aircraft, 480 registrants.

G-IV Gulfstream Aerospace · 355
GIV-X (G450) Gulfstream Aerospace · 234
GIV-X Gulfstream Aerospace · 9
G-IV (G400) Gulfstream Aerospace · 8
GIV-X (G350) Gulfstream Aerospace · 6

Largest fleets: CA 83, UT 73, DE 70, FL 68, TX 44, OH 42.

Who operates it, by registrant →

Repair and requests

No repair station here names this type yet. Search repair capabilities by part number.

Need a part? Open its page and send a request; no account.

Questions

What Gulfstream IV/G400/G450 parts are for sale on PartsAndPlanes?: No listing is tagged to the Gulfstream IV/G400/G450 today; a request from this page reaches sellers who carry its families, and the part pages show who has each number.
Which airworthiness directives apply to the Gulfstream IV/G400/G450?: 12 FAA airworthiness directives on our record name the Gulfstream IV/G400/G450, 6 of them final; each links to the AD page with the part numbers it names.
What parts fail most often on the Gulfstream IV/G400/G450?: Operators filed 88 service difficulty reports on the Gulfstream IV/G400/G450 in five years; the parts reported most were Flap System (1159CS20000560), Hydraulic Line (1159H4020027), Dump Valve (1159SCH51219), Window (1159CE2003437). Counts are the FAA's; they describe reporting, not reliability.
How many Gulfstream IV/G400/G450 aircraft are registered in the U.S.?: 612 aircraft across 5 model variants, held by 480 registrants; the largest fleets are in CA, UT, DE.

Registry and reports as of 2026-09-28. See also condition codes and NSN lookup.