What it approves
Lycoming O-360-A1D engine, McCauley 2D36C14/78KM-4 or Hartzell HC-C2YK-1A/7666-2 propellers.
What the certificate says
From the PDF’s text layer, without the form’s printed wording. Layout and order may differ; the PDF is the record.
This certificate issued to
Part 3 of the Civil Air Regulations.
Installation of Lycoming O-360-A1D engine with standard Lycoming accessories and McCauley 2D26C14/78KM-4 or Hartzell HC- C2YK-1A/7666-2 propellers. Data required: Cessna 172, A, B, C – Doyn Aircraft, Inc. Dwg. Nos. 1199 dtd 11/1/59; 1199-DCN1A dtd 4/18/60; 1199-DCN2 dtd 11/9/60; and 1199-DCN3A dtd 7/1/63. Cessna 172, D, E, F, G, H – Doyn Aircraft, Inc. Dwg. Nos.
above for Cessna 172 and 1013—DCN3 dtd 8/22/63; 1700-DCN3 dtd 8/22/63; 1702 dtd 9/8/61; 1703 dtd 9/7/61; 1702-DCN1 dtd 9/4/63; and 1703-DCN2 dtd 8/25/63; in addition for Cessna 172G and H, Dwg. No. 1102-DCN3 dtd 10/28/65.
1. Engine Limits: (All operations) 2700 RPM, 180 HP.
2. Propeller Limits: McCauley 2D36C14/78KM-4 propleller. Pitch setting: 12.7° low, 27.5° high. Hartzell HC-C2YK- 1/7666-2 propeller. Pitch setting 13° low, 29° high.
Placard: “Avoid continuous operation between 2000 RPM and 2250 RPM.”
Powerplant Instruments: Red Line 2700, Red Arc 2000 – 2250 RPM.
Special Installation Procedure: Blade centerline must be 120° clockwise from No. 1 crankthrow facing engine propeller engine.
Compatibility of this modification with other previously approved modifications must be determined by the installer.
D’Shannon Products, Ltd.
1309 County Road 134 Buffalo, MN 55313 3A12 Make : Cessna Model : 172 A, B, C, D, E, F, G, H Date of application : November 11, 1959
Date of issuance : September 21, 1960
Date reissued : 7/26/61; 7/5/63; 9/4/63; 10/23/63; 4/30/65;
11/5/65; 1/25/66; 12/20/66; 5/17/78; 5/12/11; 7/14/11
( Signature) Melvin D. Taylor Manager Atlanta Aircraft Certification Office
( Title)
ADs that name this STC · 2
An AD can apply because an STC is installed, or mention one in its text.
Approved models · 9
| Make | Model | Data sheet |
|---|---|---|
| The Cessna Aircraft Company | 172 | 3A12 |
| The Cessna Aircraft Company | 172A | 3A12 |
| The Cessna Aircraft Company | 172B | 3A12 |
| The Cessna Aircraft Company | 172C | 3A12 |
| The Cessna Aircraft Company | 172D | 3A12 |
| The Cessna Aircraft Company | 172E | 3A12 |
| The Cessna Aircraft Company | 172F (USAF T-41A) | 3A12 |
| The Cessna Aircraft Company | 172G | 3A12 |
| The Cessna Aircraft Company | 172H (USAF T-41A) | 3A12 |
Every issue · 2
DRS keeps each issue of an STC as its own record, with its own certificate and attachments.
| Date | Status | Files |
|---|---|---|
| July 14, 2011 | Reissued, current | Certificate |
| May 12, 2011 | Reissued, earlier issue | Certificate |