Type Record · As of May 3, 2026
WACO YKS-7
Fixed Wing Single Engine · JACOBS L4 /R755-7
Registered
21
Year Range
1937–1940
NTSB Events
6
Airworthiness Directives
0
01 / Distribution
Where the fleet lives and was built
Counts of currently-registered WACO YKS-7 aircraft by US state and decade of manufacture, sourced from the FAA Aircraft Registry.
By State (top 10)
- CA 19.0% 4
- WA 14.3% 3
- OH 9.5% 2
- NH 9.5% 2
- IL 9.5% 2
- MN 4.8% 1
- OR 4.8% 1
- NC 4.8% 1
- NE 4.8% 1
- MI 4.8% 1
+3 more states
By Decade of Manufacture
- 1930s 85.7% 18
- 1940s 4.8% 1
- Unknown 9.5% 2
02 / NTSB Records
Events involving WACO YKS-7 aircraft
6 event(s) on file. Showing the most recent 6.
-
Jun 8, 2018
N17473Fairhope, Alabama
NTSB Docket → -
May 13, 2016
N17734Millersburg, Ohio
NTSB Docket → -
Apr 26, 2013
N17472Rialto, California
NTSB Docket → -
Aug 21, 1981
N17464CASPER, Wyoming Fatal
NTSB Docket → -
Apr 20, 1969
N17716BAYTOWN, Texas
NTSB Docket → -
Jul 23, 1968
N1937ALBUQUERQUE, New Mexico
NTSB Docket →
03 / Airworthiness Directives
FAA directives applicable to WACO YKS-7
No matching airworthiness directives are on file for this make and model in the Federal Register.
04 / Type Certificate Data Sheets
FAA TCDS for WACO YKS-7
The TCDS is the legal certification document — weight limits, performance, equipment, AD compliance times, operating limitations. 1 match in the FAA catalog.
- TC 626 Current Rev 0 ·
The Waco Aircraft Company
Models: ZKS-7 (Army UC-72M), YKS-7 (Army UC-72K)
06 / Supplemental Type Certificates
Modifications approved for WACO YKS-7
31 STCs on file — every FAA-approved modification, alteration, or installation for this aircraft. STOL kits, avionics, fuel systems, floats, engine swaps, you name it.
-
08/21/2024
STC SA01757WI
To allow the use of UL91 or UL94 (minimum) grade aviation fuel
Swift Fuels LLC
-
05/17/2024
STC SA4503NM (PAGE 2)
Remove original cloth covering and install Ceconite covering
Ceconite Division of Poly-Fiber Inc.
-
09/09/2022
STC SA1008WE
Installation of Poly-Fiber covering material.
Poly-Fiber Inc
-
07/27/2022
STC SA01757WI
To allow the use of UL91 or UL94 (minimum) grade aviation fuel
Swift Fuels LLC
-
05/19/2022
STC SA04776NY (1 OF 2)
The HIPEC Covering and Finishing System must be performed and maintained
HIPEC Aircraft Coatings Inc.
-
03/12/2021
STC SE02712SE
Installation of the Oil Scavenging Pump System for Jacobs L-4 and R-755
Henry F. Rogers
-
07/27/2020
STC SA01831WI
To allow the use of UL91 (minimum) grade aviation fuel
Petersen Aviation Inc
-
02/11/2019
STC SA01831WI
To allow the use of UL91 (minimum) grade aviation fuel
ADI LLC
-
12/20/2017
STC SA01406NY
Installation of Airwolf remote mounted engine oil filter kit AFC-K017 on single and multi-engine fixed light aircraft and\nrotary wing
Airwolf Filter Corporation
-
01/24/2017
STC SA01831WI
To allow the use of UL91 (minimum) grade aviation fuel
Petersen Aviation Inc
-
05/20/2016
STC SA01757WI
To allow the use of UL91 or UL94 (minimum) grade aviation fuel
Swift Fuels LLC
-
03/09/2016
STC SA01757WI
To allow the use of UL91 or UL94 (minimum) grade aviation fuel
Petersen Aviation Inc
-
10/28/2015
STC SA01757WI
To allow the use of UL91 (minimum) grade aviation fuel
Petersen Aviation Inc
-
10/31/2012
STC SA01406NY
Installation of Airwolf remote mounted engine oil filter kit AFC-K017 on single and multi-engine fixed light aircraft and\nrotary wing
Airwolf Filter Corporation
-
02/25/2011
STC SA4503NM (PAGE 2)
Install Ceconite covering material.
Ceconite Division of Poly-Fiber Inc
-
12/09/2009
STC SA2693NM (PAGE 2)
Installation of Electronics International digital volt/amp gauges and accessories.
Electronics International Inc.
-
06/26/2009
STC SA01734SE (PG 4)
Application of Stewart Systems synthetic fabric covering system to aircraft fuselage, wings, tail surfaces, control surfaces and related parts.
Stewart Thomas D. and Stewart Dan R.
-
07/24/2008
STC SA02033AT (PAGE 5)
Modification to install an air-oil separator to prevent oil from being aspirated from the engine breather line (47J series w stc's SH4-235SW, SH4-826SW or SH479SW)
M-20 Oil Separators LLC
-
03/29/2006
STC SA02268CH (PAGE 5)
Installation of Airwolf Filter Corp. Air Oil Separator
Airwolf Filter Corporation
-
01/24/2005
STC SA2693NM
Installation of Electronics International digital volt/amp gauges and accessories.
Electronics International Inc.
-
05/27/2003
STC SA1008WE
Installation of Poly-Fiber covering material.
Poly-Fiber Inc.
-
05/27/2003
STC SA1008WE
Installation of Poly-Fiber covering material.
Poly-Fiber Inc
-
10/29/2001
STC SA01406NY
Installation of remote mounted engine oil filter kit AFC-K017 on aircraft powered by Jacobs radial reciprocating engine series R-755, including models L-4MB and on Continental radi…
Airwolf Filter Corporation
-
10/06/1992
STC SA1008WE
Installation of Poly-Fiber covering material.
Poly-Fiber, Inc
-
02/24/1992
STC SA2687NM
Installation of Truboplus/ Electronics Int'l gauges and switches.
ACD Corporation
-
06/06/1990
STC SA2350NM Page 2
Installation of Electronics International Inc digital carburetor/outside air temperature gauges
Electronics International
-
01/26/1988
STC SA2693NM
Installation of Electronics International digital volt/amp gauges and accessories.
Electronics International
-
05/26/1987
STC SA2350NM (PAGE 2)
Installation of Electronics International Inc Digital carburetor/outside air temperature gauges listed on the attached continutation sheet and the associated accessories
Electronics International
-
02/16/1984
STC SA2190NM Page 2
Installation of electronics International Digital Volt/Amp Gauges and Accessories.
Electronics International
-
01/01/1960
STC SA4-1053
Ceconite 101 covering of complete airframe.
Cooper Engineering Corporation
+ 1 more STCs on file
04 / Regulations watching this type
Advisory Circulars and Federal Register activity for WACO YKS-7
Advisory Circulars
No ACs explicitly mention this type. Showing universal operating-rule ACs that apply to all aircraft.
Recent Federal Register activity
Latest rulemakings touching general operating rules (Part 91) and maintenance rules (Part 43).
- 2026-04-17 Settlement Policy for Small Unmanned Aircraft System (UAS) Cases FR ↗
- 2026-02-10 Normalizing Unmanned Aircraft Systems Beyond Visual Line of Sight Operations; Reopening of Comment Period; Denial of Extension FR ↗
- 2026-02-02 25-Hour Cockpit Voice Recorder (CVR) Requirement, New Aircraft Production FR ↗
- 2026-01-28 Normalizing Unmanned Aircraft Systems Beyond Visual Line of Sight Operations; Reopening of Comment Period FR ↗
- 2026-01-07 Requirements for Interference-Tolerant Radio Altimeter Systems FR ↗
05 / Aircraft of this type
All 21 registered N-numbers
Every tail currently on the FAA registry for this make/model. Click an N-number to query the FAA Aircraft Inquiry; rows flagged ● have NTSB events on file. Tails seeded with full TallyAero pages link directly.
| N-number | St | Year | NTSB | FAA |
|---|---|---|---|---|
| N17453 | MN | 1937 | · | Look up ↗ |
| N17462 | OR | 1937 | · | Look up ↗ |
| N17464 | NC | — | ● | Look up ↗ |
| N17466 | OH | 1937 | · | Look up ↗ |
| N17471 | WA | 1937 | · | Look up ↗ |
| N17472 | CA | 1937 | ● | Look up ↗ |
| N17473 | NH | 1937 | ● | Look up ↗ |
| N17474 | IL | 1937 | · | Look up ↗ |
| N17713 | CA | 1937 | · | Look up ↗ |
| N17716 | IL | 1937 | ● | Look up ↗ |
| N17734 | NH | 1937 | ● | Look up ↗ |
| N17736 | NE | 1937 | · | Look up ↗ |
| N17737 | MI | 1937 | · | Look up ↗ |
| N1937 | CA | 1937 | ● | Look up ↗ |
| N19371 | OH | 1938 | · | Look up ↗ |
| N19373 | WI | 1938 | · | Look up ↗ |
| N19386 | VA | 1939 | · | Look up ↗ |
| N2629 | WA | — | · | Look up ↗ |
| N2896D | WA | 1938 | · | Look up ↗ |
| N29370 | FL | 1940 | · | Look up ↗ |
| N65201 | CA | 1937 | · | Look up ↗ |
Source — FAA Aircraft Registry · click "Look up" to query the live registry record (owner, address, last airworthiness)
05 / Sources & Methodology
Every count traces back to a primary US-government source
- FAA Aircraft Registry →
Refreshed Apr 27, 2026
Available
- NTSB CAROL →
Refreshed Apr 27, 2026
Available
- Federal Register (FAA Airworthiness Directives) →
Refreshed Apr 27, 2026
Available
We render counts and lists as the agency publishes them. Read the methodology →