WACO ZKS-7

01 /  Distribution

Where the fleet lives and was built

Counts of currently-registered WACO ZKS-7 aircraft by US state and decade of manufacture, sourced from the FAA Aircraft Registry.

02 /  NTSB Records

Events involving WACO ZKS-7 aircraft

1 event(s) on file. Showing the most recent 1.

• Jun 27, 1981

  N17457

  HAMILTON, Ohio Serious

  NTSB Docket →

03 /  Airworthiness Directives

FAA directives applicable to WACO ZKS-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 ZKS-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)

  Atlas TCDS → DRS ↗

06 /  Supplemental Type Certificates

Modifications approved for WACO ZKS-7

26 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

  Atlas STC → DRS ↗

• 05/17/2024

  STC SA4503NM (PAGE 2)

  Remove original cloth covering and install Ceconite covering

  Ceconite Division of Poly-Fiber Inc.

  Atlas STC → DRS ↗

• 07/27/2022

  STC SA01757WI

  To allow the use of UL91 or UL94 (minimum) grade aviation fuel

  Swift Fuels LLC

  Atlas STC → DRS ↗

• 05/19/2022

  STC SA04776NY (1 OF 2)

  The HIPEC Covering and Finishing System must be performed and maintained

  HIPEC Aircraft Coatings Inc.

  Atlas STC → DRS ↗

• 07/27/2020

  STC SA01831WI

  To allow the use of UL91 (minimum) grade aviation fuel

  Petersen Aviation Inc

  Atlas STC → DRS ↗

• 02/11/2019

  STC SA01831WI

  To allow the use of UL91 (minimum) grade aviation fuel

  ADI LLC

  Atlas STC → DRS ↗

• 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

  Atlas STC → DRS ↗

• 01/24/2017

  STC SA01831WI

  To allow the use of UL91 (minimum) grade aviation fuel

  Petersen Aviation Inc

  Atlas STC → DRS ↗

• 05/20/2016

  STC SA01757WI

  To allow the use of UL91 or UL94 (minimum) grade aviation fuel

  Swift Fuels LLC

  Atlas STC → DRS ↗

• 03/09/2016

  STC SA01757WI

  To allow the use of UL91 or UL94 (minimum) grade aviation fuel

  Petersen Aviation Inc

  Atlas STC → DRS ↗

• 10/28/2015

  STC SA01757WI

  To allow the use of UL91 (minimum) grade aviation fuel

  Petersen Aviation Inc

  Atlas STC → DRS ↗

• 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

  Atlas STC → DRS ↗

• 02/25/2011

  STC SA4503NM (PAGE 2)

  Install Ceconite covering material.

  Ceconite Division of Poly-Fiber Inc

  Atlas STC → DRS ↗

• 12/09/2009

  STC SA2693NM (PAGE 2)

  Installation of Electronics International digital volt/amp gauges and accessories.

  Electronics International Inc.

  Atlas STC → DRS ↗

• 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.

  Atlas STC → DRS ↗

• 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

  Atlas STC → DRS ↗

• 03/29/2006

  STC SA02268CH (PAGE 5)

  Installation of Airwolf Filter Corp. Air Oil Separator

  Airwolf Filter Corporation

  Atlas STC → DRS ↗

• 01/24/2005

  STC SA2693NM

  Installation of Electronics International digital volt/amp gauges and accessories.

  Electronics International Inc.

  Atlas STC → DRS ↗

• 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

  Atlas STC → DRS ↗

• 02/24/1992

  STC SA2687NM

  Installation of Truboplus/ Electronics Int'l gauges and switches.

  ACD Corporation

  Atlas STC → DRS ↗

• 06/06/1990

  STC SA2350NM Page 2

  Installation of Electronics International Inc digital carburetor/outside air temperature gauges

  Electronics International

  Atlas STC → DRS ↗

• 01/26/1988

  STC SA2693NM

  Installation of Electronics International digital volt/amp gauges and accessories.

  Electronics International

  Atlas STC → DRS ↗

• 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

  Atlas STC → DRS ↗

• 02/16/1984

  STC SA2190NM Page 2

  Installation of electronics International Digital Volt/Amp Gauges and Accessories.

  Electronics International

  Atlas STC → DRS ↗

• 01/01/1960

  STC SA4-1053

  Ceconite 101 covering of complete airframe.

  Cooper Engineering Corporation

  Atlas STC → DRS ↗

• —

  STC SA4-1053

  Ceconite 101 covering of complete airframe.

  Cooper Engineering Corporation

  Atlas STC → DRS ↗

04 /  Regulations watching this type

Advisory Circulars and Federal Register activity for WACO ZKS-7

05 /  Aircraft of this type

All 5 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.

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 →