What it approves
Replace existing Pratt & Whitney (P & W) Model R-985 or R-1340 reciprocating engine installation installation with P & W (Canada) turbopropeller engine (Model PT6A-6B, -11, -11AG, -15AG, -20, -20A, -20B, -6/C20, -21, -27, -28, -34, -34AG, or -135) and Hartzell propeller (Model HC-BJTN-3 Hub and Model T10282 (+4) or T10282(N) (+4) Blades)
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.
SA1377GL Hershey Flying and Spraying Service, Inc.
3370 MN Road David City, NE 68632 Part
8.109a)(1) the Civil Air Regulations.
complete certification basis 1A16 Schweizer (Grumman)
1. If the holder agrees to permit another person to use the certificate to alter the product, the holder must give the other person written evidence of that permission.
(Continued on page 3)
5/18/1988 5/11/2026 4/25/1989 9/10/1990 5/26/1992 for Jason S. Deutschman Acting Manager, Central Certification Branch Compliance & Airworthiness Division Aircraft Certification Service 3 Replace existing Pratt and "Whitney (P & W) Model R- 985 or R-1340 reciprocating engine installation with P & W (Canada) turbopropeller engine (Model PT6A-6B, -11, -11AG, -15AG, -20, -20A, -20B, -6/C20, -21, -27, -28, -34, -34AG, or -135) and Hartzell propeller (Model HC-B3TN-3 Hub and Model T10282 (+4) or T10282(N) (+4) Blades) in accordance with Turbines Inc. Drawing List, Report 164, Rev. K, dated September 24, 1991, or later FAA approved revision .
See Chicago Aircraft Certification Office letter dated March 31, 1989, for G-164A, Serial Number 526 and above G-164B
SA1377GL 05/11/26 3
SA1377GL 05/11/26 Limitations and Conditions (continued):
2. This approval should not be extended to other aircraft of this model on which other previously approved modifications are incorporated, unless it is determined by the installer that the interrelationship between this change and any of those other previously approved modifications will introduce no adverse effect upon the airworthiness of that aircraft.
3. For G-164A models, this STC is restricted to airplanes which have received wing tip extensions in accordance with STC SA2356SW. An FAA Approved Supplemental Airplane Flight Manual, Revision 1, dated April 3, 1992, or later FAA approved revision, is required for the G-164A. An FAA approved Pilot's Operating Handbook Supplement, Revision 1, dated April 3, 1992, or later FAA approved revision, is required for the G-164B. Instructions for Continued Airworthiness are described in Turbine, Inc . Report 107 Airworthiness Limitations, Revision B, signed and dated May 26, 1992, or later FAA approved revision.
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ADs that name this STC · 0
An AD can apply because an STC is installed, or mention one in its text.
Approved models · 2
Every issue · 5
DRS keeps each issue of an STC as its own record, with its own certificate and attachments.
| Date | Status | Files |
|---|---|---|
| May 11, 2026 | Reissued, current | Certificate |
| May 26, 1992 | Amended, earlier issue | Certificate |
| May 26, 1992 | Amended, earlier issue | Certificate |
| September 10, 1990 | Amended, earlier issue | Certificate |
| April 25, 1989 | Issued, earlier issue | Certificate |