# AD 87-02-01: Tow-Release Installation Inspection - Type: Airworthiness directive - Status: Current - Products: K & L Soaring SGM 2-37, 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1-23H, SGS 1-23H-15, SGS 1-26, SGS 1-26A, SGS 1-26B, SGS 1-26C, SGS 1-26D and 23 more - Effective: January 21, 1987 - Superseded by: Nothing supersedes this AD - Product type: Aircraft, Glider - Amendment: 39-5512 - Registered aircraft: 936 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/77670EE65F6AE89B86256A4E00445C34.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/87-02-01 ## The airworthiness directive 87-02-01 SCHWEIZER AIRCRAFT CORP.: Amendment 39-5512. Applies to all Schweizer gliders (including kit built), all serial numbers certificated in any category, and all models listed below: 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) Compliance is required as indicated unless already accomplished. To prevent the possibility of the tow-hook inadvertently slipping out of the release-arm and releasing the tow-line, which could result in a forced landing, accomplish the following: (a) Within the next 5 tow release actuations after the effective date of this AD, perform the following: (1) Inspect the tow-release installation for proper part numbers, excessive wear, and possible rework or replacement of parts in accordance with Part 3A, 3B, and 3C in Schweizer Service Bulletin No. SA-001, dated October 3, 1986. (2) Perform the operational check in accordance with Figure 4 in Schweizer Service Bulletin No. SA-001, dated October 3, 1986. (b) Thereafter, at intervals not to exceed 100 hours time-in-service, accomplish the steps in Part 3B, and 3C, and Figure 4 in Schweizer Service Bulletin No. SA-001, dated October 3, 1986. Upon request, an equivalent means of compliance with the requirements of this AD may be approved by the Manager, New York Aircraft Certification Office, Aircraft Certification Division, Federal Aviation Administration, New England Region, 181 South Franklin Avenue, Room 202, Valley Stream, New York 11581, Telephone (516) 791-6680. Upon submission of substantiating data by an owner or operator through an FAA maintenance inspector, the Manager, New York Aircraft Certification Office, may adjust the compliance time specified in this AD. Schweizer Service Bulletin No. SA-001, dated October 3, 1986, identified and described in this document, is 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 received this document from the manufacturer may obtain copies upon request to Schweizer Aircraft Corp, P.O. Box 147, Elmira, New York 14902, Telephone (607) 739-3821. This document also may be examined at the Office of the Regional Counsel, Federal Aviation Administration, New England Region, 12 New England Executive Park, Burlington, Massachusetts 01803, Rules Docket Number 86-ANE-46, Room 311, between the hours of 8:00 a.m. and 4:30 p.m. Monday through Friday, except Federal holidays. This amendment becomes effective on January 21, 1987. ## Affected data sheets (12) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS G-18](https://openairdocs.org/tcds/G-18): K & L Soaring LLC; names 7 of 7 models: SGU 2-22EK, SGU 2-22A, SGU 2-22CK, SGU 2-22, SGU 2-22C, SGU 2-22E, SGU 2-22B - [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 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 G4EA](https://openairdocs.org/tcds/G4EA): K & L Soaring LLC; names 3 of 3 models: SGS 1-35A, SGS 1-35, SGS 1-35C - [TCDS G-17](https://openairdocs.org/tcds/G-17): K & L Soaring LLC; names 2 of 2 models: SGU-1-19, SGU-1-19A - [TCDS G3EA](https://openairdocs.org/tcds/G3EA): K & L Soaring LLC; names 2 of 2 models: SGS 1-34, SGS 1-34R - [TCDS GTC 5](https://openairdocs.org/tcds/GTC%205): K & L Soaring LLC; names 2 of 2 models: SGS 2-8A, SGS 2-8 - [TCDS G1EA](https://openairdocs.org/tcds/G1EA): K & L Soaring LLC; names 1 of 1 models: SGS 2-32 - [TCDS G1NE](https://openairdocs.org/tcds/G1NE): K & L Soaring LLC; names 1 of 1 models: SGM 2-37 - [TCDS G5EA](https://openairdocs.org/tcds/G5EA): K & L Soaring LLC; names 1 of 1 models: SGS 1-36 - [TCDS TC G-2-11](https://openairdocs.org/tcds/TC%20G-2-11): Schweizer Aircraft Corporation; names 1 of 1 models: TG-3A Army ## 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: 936 (936 by airframe model, 0 by engine model) - Makers: Schweizer 936 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 1-35](https://openairdocs.org/model/schweizer-sgs-1-35): 28 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) All 30 models: https://openairdocs.org/ad/87-02-01/models.md Every aircraft: https://openairdocs.org/ad/87-02-01/aircraft.md Its text cites no advisory circulars or STCs. ## NTSB investigations that cite this AD (1) From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. - [NTSB LAX87LA104](https://openairdocs.org/ntsb/LAX87LA104), Jan 31, 1987: Schweizer SGS 2-33 (N5727S), Marana, AZ, substantial damage --- 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.