| Tail Number / N-Number | N21PP |
| Manufacturer | UNDERLAND G / GROTHE L |
| Model | V-6 |
| Manufacturer's Serial Number | 11 |
| Aircraft Type | Fixed wing single engine |
| Category | Land |
| Builder Certification | Not Type Certificated |
| Number of Seats | 4 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | LYCOMING |
| Engine Model | 0-340 SERIES |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 170 hp (127 kW) |
| Type of Registrant | Partnership |
| Owner Name | CLINTON PUEPPKE |
| Other Names |
|
| Street | 2526 147TH AVE SE |
| City | AYR |
| State | ND |
| Zip Code | 58007-9715 |
| Region | Great Lakes |
| County | Cass County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Experimental |
| Airworthiness Date | 1996-05-14 |
| Certificate Issue Date | 2020-04-27 |
| Last Action Date | 2023-01-22 |
| Expiration Date | 2027-04-30 |
| Status | Valid Registration |
| Mode S Code | 50334174 |
| Mode S Code Hex | A1B87C |
Deregistered Aircraft 1 of 1. This aircraft was previously assigned the N-number N21PP.
| Tail Number / N-Number | N21PP |
| Manufacturer | RAVEN |
| Model | S55A |
| Year Built | 1973 |
| Manufacturer's Serial Number | S55A-138 |
| Aircraft Type | Balloon |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 1 seat |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | NONE |
| Engine Model | NONE |
| Number of Engines | 0 engines |
| Average Cruising Speed | 60 miles per hour |
| Type of Registrant | Individual |
| Owner Name | SALE REPORTED |
| Street | 11857 VIRGINIA AVE |
| City | LYNWOOD |
| State | CA |
| Zip Code | 90262 |
| County | Cass County |
| Country | US |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1973-11-02 |
| Last Action Date | 1982-09-04 |
| Last Status | Sale Reported – Canceled |
| Cancellation Date | 2012-08-09 |