# AD 87-17-01: Tow Release Installation - Type: Airworthiness directive - Status: Current - Products: K & L Soaring SGS 1-23, SGS 1-23D, SGS 1-23F, SGS 1-23G, SGS 1-23H, SGS 1-23H-15, SGS 1-26, SGS 1-26A, SGS 1-26B, SGS 1-26C, SGS 1-26D, SGS 1-26E and 16 more - Effective: August 19, 1988 - Superseded by: Nothing supersedes this AD - Product type: Aircraft, Glider - Amendment: 39-5973 - Registered aircraft: 905 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/6A79099D893FC00186256A4E004462FA.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/87-17-01 ## The airworthiness directive 87-17-01 SCHWEIZER AIRCRAFT CORP: Amendment 39-5973. Final copy of priority letter AD issued August 18, 1987. Applies to models (including kit built) SGU 1-7; SGS 2-8 (TG-2); SGS 2-12 (TG-3); SGU 1-19; SGU 1-20; SGU 1-21; SGU 2-22, 2-22A, 2-22C, 2- 22CK, 2-22E, 2-22EK; SGS 1-23, 1-23B, 1-23C, 1-23D, 1-23E, 1-23F, 1-23G, 1-23H, 1-23H15; SGS 1-24; SGS 1-26, 1-26A, 1-26B, 1-26C, 1-26D, 1-26E; SGS 2-32; SGS 2-33, 2-33A, 2- 33AK; SGS 1-34, 1-34R; SGS 1-35C; SGS 1-36 (SPRITE) gliders, certificated in any category. Compliance is required prior to the next flight after the effective date of this AD, unless already accomplished. To prevent the possibility of the tow release assembly creating a jammed condition during towing and subsequent failure of the tow line to release, which could result in a forced landing, accomplish the following: (a) Inspect the tow release installation to determine if any of the following release arms are installed: P/N 1D217-13, 1D222-15, 1D222-17 or 34017D-15. NOTE: The above arms can be identified by a lug which is welded on the front face of the release arm as shown in Figure 1 of Schweizer Service Bulletin (SB) No. SA-005.1, dated January 31, 1988. (b) Tow release installations which have any of the release arms listed in (a) must have the arms replaced in the following manner: P/N 1D217-13 replace with 1D217-09 P/N 1D222-15 replace with 1D222-11 P/N 1D222-17 replace with 1D222-13 P/N 34017D-15 replace with 34017D-11 (c) Perform the operational check in accordance with Figure 4 in Schweizer SB No. SA-001.3, dated January 31, 1988, following release arm replacement. (d) Upon request, an equivalent means of compliance with the requirements of this AD may be approved by the Manager, New York Aircraft Certification Office, Federal Aviation Administration (FAA), New England Region, 181 South Franklin Avenue, Room 202, Valley Stream, New York 11581. Schweizer Aircraft Corporation SB No's. SA-005.1, and SA-001.3, both dated January 31, 1988, identified and described in this document, are incorporated herein and made a part hereof pursuant to 5 U.S.C. 552(a)(1). All persons affected by this directive who have not already received these documents from the manufacturer may obtain copies upon request from Schweizer Aircraft Corporation, P.O. Box 147, Elmira, New York 14902; telephone (607) 739-3821. These documents may also be examined at the Office of the Regional Counsel, Federal Aviation Administration, New England Region, 12 New England Executive Park, Burlington, Massachusetts 01803, Room 311, Docket No. 87-ANE-29, between the hours of 8:00 a.m. and 4:30 p.m., Monday through Friday, except federal holidays. This amendment, 39-5973, becomes effective on August 19, 1988, as to all persons except those persons to whom it was made immediately effective by individual priority letter AD 87-17-01, issued August 18, 1987, which contained this amendment. ## Affected data sheets (10) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS 1G1](https://openairdocs.org/tcds/1G1): K & L Soaring LLC; names 6 of 6 models: SGS 1-23D, SGS 1-23F, SGS 1-23G, SGS 1-23H, SGS 1-23H-15, SGS 1-23 - [TCDS 1G10](https://openairdocs.org/tcds/1G10): K & L Soaring LLC; names 6 of 6 models: SGS 1-26B, SGS 1-26C, SGS 1-26, SGS 1-26A, SGS 1-26E, SGS 1-26D - [TCDS G-18](https://openairdocs.org/tcds/G-18): K & L Soaring LLC; names 6 of 7 models: SGU 2-22EK, SGU 2-22A, SGU 2-22CK, SGU 2-22, SGU 2-22C, SGU 2-22E - [TCDS G2EA](https://openairdocs.org/tcds/G2EA): K & L Soaring LLC; names 3 of 4 models: SGS 2-33AK, SGS 2-33, SGS 2-33A - [TCDS G3EA](https://openairdocs.org/tcds/G3EA): K & L Soaring LLC; names 2 of 2 models: SGS 1-34, SGS 1-34R - [TCDS G-17](https://openairdocs.org/tcds/G-17): K & L Soaring LLC; names 1 of 2 models: SGU-1-19 - [TCDS G1EA](https://openairdocs.org/tcds/G1EA): K & L Soaring LLC; names 1 of 1 models: SGS 2-32 - [TCDS G4EA](https://openairdocs.org/tcds/G4EA): K & L Soaring LLC; names 1 of 3 models: SGS 1-35C - [TCDS G5EA](https://openairdocs.org/tcds/G5EA): K & L Soaring LLC; names 1 of 1 models: SGS 1-36 - [TCDS GTC 5](https://openairdocs.org/tcds/GTC%205): K & L Soaring LLC; names 1 of 2 models: SGS 2-8 ## Registered aircraft it may apply to (OpenAirDocs) Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment. - Aircraft: 905 (905 by airframe model, 0 by engine model) - Makers: Schweizer 905 Models with the most aircraft: - [Schweizer SGS 2-33A](https://openairdocs.org/model/schweizer-sgs-2-33a): 173 aircraft (airframe model) - [Schweizer SGS 1-26E](https://openairdocs.org/model/schweizer-sgs-1-26e): 131 aircraft (airframe model) - [Schweizer SGS 1-26B](https://openairdocs.org/model/schweizer-sgs-1-26b): 92 aircraft (airframe model) - [Schweizer SGS 1-26A](https://openairdocs.org/model/schweizer-sgs-1-26a): 64 aircraft (airframe model) - [Schweizer SGS 1-26C](https://openairdocs.org/model/schweizer-sgs-1-26c): 55 aircraft (airframe model) - [Schweizer SGS 1-26D](https://openairdocs.org/model/schweizer-sgs-1-26d): 50 aircraft (airframe model) - [Schweizer SGS 2-32](https://openairdocs.org/model/schweizer-sgs-2-32): 47 aircraft (airframe model) - [Schweizer SGS 1-34](https://openairdocs.org/model/schweizer-sgs-1-34): 45 aircraft (airframe model) - [Schweizer SGS 2-33](https://openairdocs.org/model/schweizer-sgs-2-33): 38 aircraft (airframe model) - [Schweizer SGU 2-22E](https://openairdocs.org/model/schweizer-sgu-2-22e): 32 aircraft (airframe model) - [Schweizer SGS 1-36](https://openairdocs.org/model/schweizer-sgs-1-36): 28 aircraft (airframe model) - [Schweizer SGS 1-35C](https://openairdocs.org/model/schweizer-sgs-1-35c): 26 aircraft (airframe model) - [Schweizer SGU-1-19](https://openairdocs.org/model/schweizer-sgu-1-19): 16 aircraft (airframe model) - [Schweizer SGU 2-22C](https://openairdocs.org/model/schweizer-sgu-2-22c): 16 aircraft (airframe model) - [Schweizer SGS 1-26](https://openairdocs.org/model/schweizer-sgs-1-26): 15 aircraft (airframe model) - [Schweizer SGU 2-22CK](https://openairdocs.org/model/schweizer-sgu-2-22ck): 11 aircraft (airframe model) - [Schweizer SGS 1-23H-15](https://openairdocs.org/model/schweizer-sgs-1-23h-15): 10 aircraft (airframe model) - [Schweizer SGU 2-22](https://openairdocs.org/model/schweizer-sgu-2-22): 10 aircraft (airframe model) - [Schweizer SGS 1-23](https://openairdocs.org/model/schweizer-sgs-1-23): 9 aircraft (airframe model) - [Schweizer SGS 2-8](https://openairdocs.org/model/schweizer-sgs-2-8): 9 aircraft (airframe model) All 27 models: https://openairdocs.org/ad/87-17-01/models.md Every aircraft: https://openairdocs.org/ad/87-17-01/aircraft.md Its text cites no advisory circulars or STCs. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.