Staging copy. The live site is at https://staging.data.eflight.com.
eFlight RegistryFAA data, updated daily
Registered aircraft · FAA record as of September 25, 2026
N904BF

Ramsdell Willis RV4

Valid Utah

N904BF is a Ramsdell Willis RV4, a fixed-wing airplane with one motor with a piston engine. It has 2 seats. It is registered to Grandbear Air LLC, an LLC in Mountain Green, Utah. The registration is valid: it was issued on May 5, 2021 and expires on May 31, 2028. It holds an experimental airworthiness certificate for amateur built, dated May 23, 2008.

Aircraft

Maker
Ramsdell Willis
Model
RV4
Serial number
3630
Type
Fixed-wing, single engine
Power
Piston (reciprocating), 1 motor · Cont Motor IO-360-A · 210 hp
Seats
2
Year built
Not given
Transponder code
AC7E27 (octal 53077047)

Registration

Status
Valid registration
Certificate issued
May 5, 2021
Expires
May 31, 2028
Last FAA action
May 12, 2023
Airworthiness
Experimental · Amateur built · May 23, 2008
FAA region
Northwest Mountain
FAA record id
00110229

Owner as the FAA publishes it

Name
Grandbear Air LLC
Type
LLC
Address
3662 Quail Point Rd
Mountain Green, UT 84050-9349

Owners can ask the FAA to withhold their name and address from public files. When they do, those fields are blank here as well. How that works.

Documents on file 0

No bills of sale, loans or other documents are indexed against this tail number.

Source: FAA Civil Aviation Registry, Releasable Aircraft Database, September 25, 2026. See this record on the FAA site · This record as data